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b4serenity@gmail.com
05-10-06, 07:37 AM
I have broadband cable internet service from Comcast and I've been very
happy with it until this past week. I've been having intermitant
service to the net and it's really bugging me! It will work fine and
the online light will be on the external modem and then it will just be
off and no internet for my family (and biz). Then, it will just come
back on again after a few minutes, maybe stay on for hours then off
again for awhile.

I've talked to Comcast and we did a powerdown reset on the computer and
modem and he could tell on his end what my modem was trying to do (but
not succeeding in doing = to get online) and he said that the signal
was good to the house and that many people on my street were on at that
very moment w/o any complaints. He had me test the cable channels and
they were all fine as well. A new (mega thick) line was run to our
house just a few months back (worked fine after the cable was
installed). So he said it must be the modem.

We own our modem so they offered to have us signup for their rental
service ($3?/mo) but he wasn't sure if there would be a service
/installation fee to deliver and set it up. I told him I'd just buy
another one myself.

Am I smart in doing this or should I just pay their fee and have them
do it so the servicing is all on them? I worry (and have heard about)
about them using some cheap modems that actually don't work as reliably
or as fast as the Moto Surfboard SB5100 that I now have. Yes, the irony
of that last staement about my modem being reliable has hit me!

I have some info (an error log and some specific numbers but I'm not
sure which ones are relevent here) from a Motorola diagnostics site if
that could help anybody help me.

Before I fork over my money on a new modem could it be anything else?

Thanks so much for the help!!!!

Agent_C
05-10-06, 10:21 AM
On 10 May 2006 05:37:36 -0700, b4serenity@gmail.com wrote:

>[...]many people on my street were on at that
>very moment w/o any complaints.

They always say that... Don't take that as a given, as the tech you're
speaking to has no idea what other people are complaining about.

Ask your neighbors if they're having the same problem.

A_C

Dave
05-10-06, 01:23 PM
Can you access the modem to see the levels yourself?


<b4serenity@gmail.com> wrote in message
news:1147264656.303593.97980@i40g2000cwc.googlegroups.com...
>I have broadband cable internet service from Comcast and I've been very
> happy with it until this past week. I've been having intermitant
> service to the net and it's really bugging me! It will work fine and
> the online light will be on the external modem and then it will just be
> off and no internet for my family (and biz). Then, it will just come
> back on again after a few minutes, maybe stay on for hours then off
> again for awhile.
>
> I've talked to Comcast and we did a powerdown reset on the computer and
> modem and he could tell on his end what my modem was trying to do (but
> not succeeding in doing = to get online) and he said that the signal
> was good to the house and that many people on my street were on at that
> very moment w/o any complaints. He had me test the cable channels and
> they were all fine as well. A new (mega thick) line was run to our
> house just a few months back (worked fine after the cable was
> installed). So he said it must be the modem.
>
> We own our modem so they offered to have us signup for their rental
> service ($3?/mo) but he wasn't sure if there would be a service
> /installation fee to deliver and set it up. I told him I'd just buy
> another one myself.
>
> Am I smart in doing this or should I just pay their fee and have them
> do it so the servicing is all on them? I worry (and have heard about)
> about them using some cheap modems that actually don't work as reliably
> or as fast as the Moto Surfboard SB5100 that I now have. Yes, the irony
> of that last staement about my modem being reliable has hit me!
>
> I have some info (an error log and some specific numbers but I'm not
> sure which ones are relevent here) from a Motorola diagnostics site if
> that could help anybody help me.
>
> Before I fork over my money on a new modem could it be anything else?
>
> Thanks so much for the help!!!!
>

b4serenity@gmail.com
05-10-06, 02:16 PM
Does any of this help any?

/////////////////////////////
Downstream Value
Frequency 687000000 Hz Locked
Signal to Noise Ratio 36 dB
Power Level -10 dBmV
The Downstream Power Level reading is a snapshot taken at the time this
page was requested. Please Reload/Refresh this Page for a new reading

Upstream Value
Channel ID 3
Frequency 31000000 Hz Ranged
Power Level 52 dBmV
////////////////////////////////////

ERROR LOG
Time Priority Code Message
2006-05-10 13:34:47 3-Critical R005.0 Started Unicast Maintenance
Ranging - No Response received - T3 time-out
2006-05-10 12:24:22 3-Critical R002.0 No Ranging Response received -
T3 time-out
2006-05-10 12:23:57 3-Critical T001.0 SYNC Timing Synchronization
failure - Failed to acquire QAM/QPSK symbol timing
2006-05-10 12:23:43 3-Critical D005.0 TFTP failed - request sent -
No Response
2006-05-10 12:22:33 3-Critical R007.0 Unicast Ranging Received Abort
Response - Re- initializing MAC
2006-05-10 12:21:54 3-Critical R002.0 No Ranging Response received -
T3 time-out

Bit Twister
05-10-06, 02:32 PM
On 10 May 2006 12:16:22 -0700, b4serenity@gmail.com wrote:
> Does any of this help any?
>
> /////////////////////////////
> Downstream Value
> Frequency 687000000 Hz Locked
> Signal to Noise Ratio 36 dB
> Power Level -10 dBmV
> The Downstream Power Level reading is a snapshot taken at the time this
> page was requested. Please Reload/Refresh this Page for a new reading
>
> Upstream Value
> Channel ID 3
> Frequency 31000000 Hz Ranged
> Power Level 52 dBmV

at a glance you seem to be riding on the end of the power level specs.
Here are suggested working ranges for solid operation. Values are from mine:

Motorola Surboard SB5120 QAM 256 (Working range)
Down Power -4 dBmV (-10 and +10 dBmV)
SNR 37 dB (higher than 33dB)
Up Power 48 dBmV (30 and 55dBmV)


Anytime you lose the connection, get the values.

b4serenity@gmail.com
05-10-06, 02:39 PM
First of all thanks so much for the help!!

I only get these values when I'm online by connecting to a Moto site I
saw in one of these posts. When my modem goes ofline I can't get these
numbers

Does it look like the modem is bad or is it saying that I'm getting a
fairly weak (barely strong enough) signal?


Thanks again!!

b4serenity@gmail.com
05-10-06, 02:48 PM
OK, maybe we're on to something. I checked all the connections again
but this time ran the cable to the modem directly from the wall w/o
going through the splitter that they installed when they hooked up my
dvr box in the same room. My down power level went up 3 dbs to -7.
Seems a little low but not right on the bottom like it was. I'll try it
like this for awhile and see if I get dropped. Maybe the modem is
actually fine and they need to do something about the signal splitter.

On the signal splitter it says 2-way splitter 5-1000mhzand on each of
the two split connectors it says -3.5 db. Not sure what that means
exactly but is it a coincidence that my signal rose 3 db w/o it? Can I
just get a different value splitter?

Thanks agin!!

John

$Bill
05-10-06, 03:05 PM
b4serenity@gmail.com wrote:

> OK, maybe we're on to something. I checked all the connections again
> but this time ran the cable to the modem directly from the wall w/o
> going through the splitter that they installed when they hooked up my
> dvr box in the same room. My down power level went up 3 dbs to -7.
> Seems a little low but not right on the bottom like it was. I'll try it
> like this for awhile and see if I get dropped. Maybe the modem is
> actually fine and they need to do something about the signal splitter.
>
> On the signal splitter it says 2-way splitter 5-1000mhzand on each of
> the two split connectors it says -3.5 db. Not sure what that means
> exactly but is it a coincidence that my signal rose 3 db w/o it? Can I
> just get a different value splitter?

You should have a splitter coming into the house and you want the
cable modem to go direct to that splitter using preferably RG6.

Run your TVs off the other legs of that splitter (you may even use
another splitter off one of the TV lines [I do] without any major
issues).

As far as the TV in the same room as the modem, I'd run another
RG6 line for it.

Basically you want nothing else on your modem leg.

George Berger
05-10-06, 03:19 PM
In article <yNWdnXhzV83s2v_ZRVn-qg@adelphia.com>,
"$Bill" <news@SPAMOLAtodbe.com> wrote:

>> You should have a splitter coming into the house and you want the
> cable modem to go direct to that splitter using preferably RG6.
>
> Run your TVs off the other legs of that splitter (you may even use
> another splitter off one of the TV lines [I do] without any major
> issues).
>
> As far as the TV in the same room as the modem, I'd run another
> RG6 line for it.
>
> Basically you want nothing else on your modem leg.

SBill - PMFJI. I have a similar setup, viz., incoming feed split into
two -3.5db channels.

Question: Can I install an amplifier on the non-modem channel to feed
three TVs in the house, or will that cause problems? I've wired the
modem line with a 50' length of RG6, but haven't actually hooked up my
SF5120 as yet and called Comcast to set up service.

TIA

George

--
I know that you believe that you understood what you think I said, but I am
not sure you realize that what you heard is not what I meant.
-- Robert McCloskey, State Department spokesman (attributed)

Andrew Rossmann
05-10-06, 04:24 PM
[This followup was posted to comp.dcom.modems.cable and a copy was sent
to the cited author.]

In article <1147264656.303593.97980@i40g2000cwc.googlegroups.com>,
b4serenity@gmail.com says...
> I have broadband cable internet service from Comcast and I've been very
> happy with it until this past week. I've been having intermitant
> service to the net and it's really bugging me! It will work fine and
> the online light will be on the external modem and then it will just be
> off and no internet for my family (and biz). Then, it will just come
> back on again after a few minutes, maybe stay on for hours then off
> again for awhile.

When the modem is offline, what lights are blinking? If the receive
light just blinks continuously, it is trying to find the downlink signal
(receive signal strength or too much noise.) If the receive light is
solid, but the send light is blinking, it is trying to establish the
uplink (same potential problems as downlink.)

For a weak incoming signal, you can use a broadband compatible RF
amplifier. These allow the upstream signal to pass with minimal loss. It
should be placed as close to where the cable comes into your house as
possible. I would avoid the Radio Shack crap amps and get the Motorola
484095-001-00 amp if you can find it. A Google search will find alot of
sites. It's also commonly available at Circuit City, but at full price.

--
If there is a no_junk in my address, please REMOVE it before replying!
All junk mail senders will be prosecuted to the fullest extent of the
law!!
http://home.att.net/~andyross

$Bill
05-10-06, 04:46 PM
George Berger wrote:

> SBill - PMFJI. I have a similar setup, viz., incoming feed split into
> two -3.5db channels.
>
> Question: Can I install an amplifier on the non-modem channel to feed
> three TVs in the house, or will that cause problems? I've wired the
> modem line with a 50' length of RG6, but haven't actually hooked up my
> SF5120 as yet and called Comcast to set up service.

I don't see why not, but i'm running 3 TV legs off my 1-4 splitter and one
of the legs has a 1-8 splitter on it feeding 7 TVs/VCRs/PCs and I have no
problems with it. You may not need an amplifier.

You may want to check some of the websites out devoted to this sort of
thing - like broadbandreports.com etc.

George Berger
05-10-06, 05:15 PM
In article <M82dnXpiK6SHwv_ZnZ2dnUVZ_s6dnZ2d@adelphia.com>,
"$Bill" <news@SPAMOLAtodbe.com> wrote:

> You may want to check some of the websites out devoted to this sort of
> thing - like broadbandreports.com etc.

Hi. Thanks! I'll go there

Cheers, George

--
I know that you believe that you understood what you think I said, but I am
not sure you realize that what you heard is not what I meant.
-- Robert McCloskey, State Department spokesman (attributed)

Chuck Reti
05-10-06, 10:15 PM
In article <1147264656.303593.97980@i40g2000cwc.googlegroups.com>,
b4serenity@gmail.com wrote:

> I have broadband cable internet service from Comcast and I've been very
> happy with it until this past week. I've been having intermitant
> service to the net and it's really bugging me!
>---- snip ----<

I posted a very similar problem to this group a few weeks ago, received
a number of useful responses. Broadbandreports.com FAQs and forums are
full of reports from others with similar problems, and good
troubleshooting tips.
Since I own my modem (Moto SB5100) I decided to contact Motorola tech
support just to see what their story might be. When I read off values
from the modem signal and log pages (which were somewhat better than
yours), they said "those levels are terrible." Called Comcast, they sent
a tech out, who put his signal meter on the line, claimed all was
"within spec," and snugged up connections (no splitter in line, have a
direct drop from the pole to the modem, separate from the video
service). I showed him the modem's configuration pages with signal
levels and logs with "3-critical" errors of every kind. He was curious
how I was able to get that information on screen; he'd never seen _that_
before, how did I do that? So, I knew I was sunk. Trying to convince
Comcast something should be bumped up on their end, even just a bit,
looks like a hopeless effort.
--
Chuck Reti
Detroit MI

b4serenity@gmail.com
05-11-06, 07:03 AM
Andrew, and everyone else, thanks for all thew responses!

When the modem is offline (no online light) the recieve light sometimes
blinks first then usually turns solid and the send light blincks about
once per second. The PC/activity light blincks at a faster rate and
sometimes I've seen it solid. Obviously, the power light is on. Then
for seemingly no rhyme or reason the online light will come on and
everything is fine.

I thought the problem was fixed yesterday when was mainly on
especially after removing the 2 way splitter from the wall connection
(moden on one end and TV on the other). That bumped my signal about
3dbs and I stayed online longer than anytime in the last week. Then
right b4 an ebay auctiuon was about to end (!!!) the modem went offline
for the rest of the night. Then , this morning it's back on. I'm going
to rework a splitter connection at the street/house connection and get
another 3dbs. That should get my modem signal to about -4 or -5.
Does it have anything to do with people coming back from work and using
Comcast and lowering the signal (although I have lost the connection in
the day time as well)? Are the numbers I posted too low and it's a
Comcast signal problem? What's the minimum signal requirements for a
reliable signal?

Thanks again for the help!!!

John

b4serenity@gmail.com
05-11-06, 07:24 AM
I just saw a manual on the 5100 that states it's operating range as -15
> +15db. So, maybe the signal from comcast is OK and it's the modem afterall?? This is not fun! What do you think?

I may just buy the newer Moto 5120 at Wal-mart for under $60 and then
if I still have problems get Comcast out here to increase the signal.
Is it normal in some cases where the computer is not getting a strong
enough signal for them to just run a seperate line to the house or is
that always treated as more money either for the installation and/or
monthly charges?

Ed Nielsen
05-11-06, 09:37 AM
While the -10dBmV downstream is perfectly fine, I would be a little
concerned about the +52dBmV transmit level. Two possibilities are:
1) Temperature. It is possible that as the day progresses, the
increase in temperature increases the attenuation of the cable
sufficiently to push that transmit power beyond its limit, which
typically is about 56-58dBmV.

2) At some point, noise is getting into the return path, which causes
your cable modem to transmit at a higher level than it otherwise would.
The 2 biggest types of noise that can disrupt the upstream path are
ingress and impulse noise. Ingress is stuff leaking into the cable
system from the outside world. The most common causes of leakage are
loose/substandard/corroded connectors, poorly shielded cable,
substandard passive devices (splitters, taps). These are all part of
the drop system. Impulse noise can be electrical noise getting into the
cable system if there is insufficient filtering at some point where the
2 have something to do with each other, such as a cable modem plugged
directly into a wall outlet without the benefit of a surge power strip.
Vacuum cleaners and blow dryers (things that cause sparklies on your
TV when turned on) are also sources of impulse noise.

Something is causing your cable modem to shout loud enough to be heard
by the CMTS. Sounds like sometimes it has to shout so loud that it
can't be heard.

I would call and have a tech come out and figure out why your transmit
is as high as it is.


CIAO!

Ed N.

b4serenity@gmail.com wrote:
> Does any of this help any?
>
> /////////////////////////////
> Downstream Value
> Frequency 687000000 Hz Locked
> Signal to Noise Ratio 36 dB
> Power Level -10 dBmV
>
>
> Upstream Value
> Channel ID 3
> Frequency 31000000 Hz Ranged
> Power Level 52 dBmV
> ////////////////////////////////////

b4serenity@gmail.com
05-11-06, 09:58 AM
Redid some splitters/connections. So far I'm still online just fine and
here are the newest readings:
Downstream Value
Frequency 687000000 Hz Locked
Signal to Noise Ratio 38 dB
Power Level -2 dBmV
The Downstream Power Level reading is a snapshot taken at the time this
page was requested. Please Reload/Refresh this Page for a new reading

Upstream Value
Channel ID 3
Frequency 31000000 Hz Ranged
Power Level 44 dBmV

Ed Nielsen
05-11-06, 10:23 AM
That 44dBmV is a beautiful thing!


CIAO!

Ed N.

b4serenity@gmail.com wrote:
> Redid some splitters/connections. So far I'm still online just fine and
> here are the newest readings:
> Downstream Value
> Frequency 687000000 Hz Locked
> Signal to Noise Ratio 38 dB
> Power Level -2 dBmV
> The Downstream Power Level reading is a snapshot taken at the time this
> page was requested. Please Reload/Refresh this Page for a new reading
>
> Upstream Value
> Channel ID 3
> Frequency 31000000 Hz Ranged
> Power Level 44 dBmV
>

Dave
05-11-06, 12:15 PM
I don't think the 5120 is any newer than the 5100. They just justed two
different chipsets and gave them different model numbers.


<b4serenity@gmail.com> wrote in message
news:1147350284.753553.160650@g10g2000cwb.googlegroups.com...
>I just saw a manual on the 5100 that states it's operating range as -15
>> +15db. So, maybe the signal from comcast is OK and it's the modem
>> afterall?? This is not fun! What do you think?
>
> I may just buy the newer Moto 5120 at Wal-mart for under $60 and then
> if I still have problems get Comcast out here to increase the signal.
> Is it normal in some cases where the computer is not getting a strong
> enough signal for them to just run a seperate line to the house or is
> that always treated as more money either for the installation and/or
> monthly charges?
>

Dave
05-11-06, 12:17 PM
Yes, those are all good levels.


<b4serenity@gmail.com> wrote in message
news:1147359489.933125.120900@j73g2000cwa.googlegroups.com...
> Redid some splitters/connections. So far I'm still online just fine and
> here are the newest readings:
> Downstream Value
> Frequency 687000000 Hz Locked
> Signal to Noise Ratio 38 dB
> Power Level -2 dBmV
> The Downstream Power Level reading is a snapshot taken at the time this
> page was requested. Please Reload/Refresh this Page for a new reading
>
> Upstream Value
> Channel ID 3
> Frequency 31000000 Hz Ranged
> Power Level 44 dBmV
>

b4serenity@gmail.com
05-11-06, 02:28 PM
Well, I've been offline again for the last few hours again. If those
numbers are good then I THINK I have basically eliminated the signal
/wiring problem... so it's probably my modem?

Dave
05-11-06, 02:45 PM
I had a similar situation a couple years ago. Everything was fine and then
it'd go offline for 15 minutes to a few hours. Of course, when I reported
it they'd schedule a service call and all would be well by the time he
showed up 2 days later. Later another outage and the same problem. I
finally got so frustrated that I went to the local Comcast office, spoke to
the manager and described my frustration. She contacted the local
maintenance manager who called me to discuss it. They finally realized
they had an amp with an intermittent noise problem. They changed the amp
and it hasn't happened since.

If I were you, I'd be escalating the issue and talking to a higher level of
management. In that kind of situation the normal trouble reporting process
is unlikely to work and you'll have to become the squeaky wheel. I'd keep
escalating until you get someone's attention.

That's just my two cents worth.......


<b4serenity@gmail.com> wrote in message
news:1147375711.694391.308740@v46g2000cwv.googlegroups.com...
> Well, I've been offline again for the last few hours again. If those
> numbers are good then I THINK I have basically eliminated the signal
> /wiring problem... so it's probably my modem?
>

b4serenity@gmail.com
05-11-06, 04:27 PM
I just talked with others on my street w/ comcast net service and
they've been fine. So, now that, with the fairly OK signal strength
shown, has me thinking more then ever that it's probably the modem.
I'll give it a shot and see if that does the trick. If it doesn't fix
it then s the ball will be back in comcast's court.

Ed Nielsen
05-11-06, 07:19 PM
I had a situation that started around the end of January that nobody
could figure out. Talked with my assistant state engineer a few times
about it and nothing made any sense. Levels were great and S/N was
great also. Download speeds suddenly dropped to about 1/3 of what they
were previously. Swapped the modem out with one I had previously with
no change. Upload was not affected, just download. Went on for a
couple of months. Eventually, a Chief Tech in Indiana mentioned
something. I bought a new cable modem and voila, back in business.


CIAO!

Ed N.

b4serenity@gmail.com wrote:
> I just talked with others on my street w/ comcast net service and
> they've been fine. So, now that, with the fairly OK signal strength
> shown, has me thinking more then ever that it's probably the modem.
> I'll give it a shot and see if that does the trick. If it doesn't fix
> it then s the ball will be back in comcast's court.
>

b4serenity@gmail.com
05-12-06, 06:56 PM
No new modem yet but here's the latest error log; Does this indicate a
bad signal from Comcast or still possibly a Modem problem? Any help
appreciated!!

Time Priority Code Message
2006-05-12 17:46:54 3-Critical R002.0 No Ranging Response received -
T3 time-out
2006-05-12 17:46:44 3-Critical T001.0 SYNC Timing Synchronization
failure - Failed to acquire QAM/QPSK symbol timing
2006-05-12 17:46:24 3-Critical R002.0 No Ranging Response received -
T3 time-out
2006-05-12 17:46:04 3-Critical R007.0 Unicast Ranging Received Abort
Response - Re- initializing MAC
2006-05-12 17:45:47 3-Critical R002.0 No Ranging Response received -
T3 time-out
2006-05-12 17:45:42 3-Critical T001.0 SYNC Timing Synchronization
failure - Failed to acquire QAM/QPSK symbol timing
2006-05-12 17:45:21 3-Critical R002.0 No Ranging Response received -
T3 time-out
2006-05-12 17:45:07 3-Critical R007.0 Unicast Ranging Received Abort
Response - Re- initializing MAC
2006-05-12 17:44:49 3-Critical R002.0 No Ranging Response received -
T3 time-out
2006-05-12 17:44:43 3-Critical R007.0 Unicast Ranging Received Abort
Response - Re- initializing MAC
2006-05-12 17:41:28 3-Critical R005.0 Started Unicast Maintenance
Ranging - No Response received - T3 time-out
2006-05-12 13:25:23 3-Critical T001.0 SYNC Timing Synchronization
failure - Failed to acquire QAM/QPSK symbol timing
2006-05-12 13:25:19 3-Critical T002.0 SYNC Timing Synchronization
failure - Failed to acquire FEC framing
2006-05-12 13:25:19 3-Critical T001.0 SYNC Timing Synchronization
failure - Failed to acquire QAM/QPSK symbol timing
2006-05-12 13:25:14 3-Critical T002.0 SYNC Timing Synchronization
failure - Failed to acquire FEC framing
2006-05-12 13:25:12 3-Critical T001.0 SYNC Timing Synchronization
failure - Failed to acquire QAM/QPSK symbol timing
2006-05-12 13:25:12 3-Critical T002.0 SYNC Timing Synchronization
failure - Failed to acquire FEC framing
2006-05-12 13:25:11 3-Critical T001.0 SYNC Timing Synchronizatio

Ed Nielsen
05-13-06, 09:03 AM
I don't really know much about log entries, but mine often indicates
"3-Critical R02.0 No Ranging Response received - T3 time-out."

With your numbers being what they are (especially the SNR) and the fact
that no neighbors are experiencing the same issues (especially if 1 of
them is connected to the same tap (cable goes to the same pedestal as
yours), the cable modem seems to be the most likely culprit.


CIAO!

Ed N.

b4serenity@gmail.com wrote:
> No new modem yet but here's the latest error log; Does this indicate a
> bad signal from Comcast or still possibly a Modem problem? Any help
> appreciated!!
>
> Time Priority Code Message
> 2006-05-12 17:46:54 3-Critical R002.0 No Ranging Response received -
> T3 time-out
> 2006-05-12 17:46:44 3-Critical T001.0 SYNC Timing Synchronization
> failure - Failed to acquire QAM/QPSK symbol timing
> 2006-05-12 17:46:24 3-Critical R002.0 No Ranging Response received -
> T3 time-out
> 2006-05-12 17:46:04 3-Critical R007.0 Unicast Ranging Received Abort
> Response - Re- initializing MAC
> 2006-05-12 17:45:47 3-Critical R002.0 No Ranging Response received -
> T3 time-out
> 2006-05-12 17:45:42 3-Critical T001.0 SYNC Timing Synchronization
> failure - Failed to acquire QAM/QPSK symbol timing
> 2006-05-12 17:45:21 3-Critical R002.0 No Ranging Response received -
> T3 time-out
> 2006-05-12 17:45:07 3-Critical R007.0 Unicast Ranging Received Abort
> Response - Re- initializing MAC
> 2006-05-12 17:44:49 3-Critical R002.0 No Ranging Response received -
> T3 time-out
> 2006-05-12 17:44:43 3-Critical R007.0 Unicast Ranging Received Abort
> Response - Re- initializing MAC
> 2006-05-12 17:41:28 3-Critical R005.0 Started Unicast Maintenance
> Ranging - No Response received - T3 time-out
> 2006-05-12 13:25:23 3-Critical T001.0 SYNC Timing Synchronization
> failure - Failed to acquire QAM/QPSK symbol timing
> 2006-05-12 13:25:19 3-Critical T002.0 SYNC Timing Synchronization
> failure - Failed to acquire FEC framing
> 2006-05-12 13:25:19 3-Critical T001.0 SYNC Timing Synchronization
> failure - Failed to acquire QAM/QPSK symbol timing
> 2006-05-12 13:25:14 3-Critical T002.0 SYNC Timing Synchronization
> failure - Failed to acquire FEC framing
> 2006-05-12 13:25:12 3-Critical T001.0 SYNC Timing Synchronization
> failure - Failed to acquire QAM/QPSK symbol timing
> 2006-05-12 13:25:12 3-Critical T002.0 SYNC Timing Synchronization
> failure - Failed to acquire FEC framing
> 2006-05-12 13:25:11 3-Critical T001.0 SYNC Timing Synchronizatio
>

$Bill
05-13-06, 07:40 PM
Ed Nielsen wrote:

> I don't really know much about log entries, but mine often indicates
> "3-Critical R02.0 No Ranging Response received - T3 time-out."
>
> With your numbers being what they are (especially the SNR) and the fact
> that no neighbors are experiencing the same issues (especially if 1 of
> them is connected to the same tap (cable goes to the same pedestal as
> yours), the cable modem seems to be the most likely culprit.

Geez - if you know your neighbors that well, swap modems with one of
them and see what happens.

Ron W
05-30-06, 08:59 AM
Sorry I can't help -- I started having similar problems a couple of
days ago with my Motorola SB 5120 -- occasionally "Send
Channel" light flashes. I suspect I can improve my situation
with a little reduction in cable losses.
My question: How do you access the cable signal levels? Is it
available via a URL?
Thanks.

Bit Twister
05-30-06, 09:07 AM
On Tue, 30 May 2006 13:59:50 GMT, Ron W wrote:
> Sorry I can't help -- I started having similar problems a couple of
> days ago with my Motorola SB 5120 -- occasionally "Send
> Channel" light flashes. I suspect I can improve my situation
> with a little reduction in cable losses.
> My question: How do you access the cable signal levels? Is it
> available via a URL?

http://192.168.100.1

Values from mine:
Motorola Surboard SB5120 QAM 256 (Working range)
Down Power -3 dBmV (-10 and +10 dBmV)
SNR 37 dB (higher than 33dB)
Up Power 47 dBmV (30 and 55dBmV)

Ron W
05-30-06, 09:36 PM
Thanks for your help.
My levels: Downstream = -6 dBmV
Upstream = 54 dBmV.
I still want to reduce losses to get the downstream level up closer to
mid-range.

$Bill
05-30-06, 10:33 PM
Ron W wrote:

> Thanks for your help.
> My levels: Downstream = -6 dBmV
> Upstream = 54 dBmV.
> I still want to reduce losses to get the downstream level up closer to
> mid-range.

I'd be more worried about your *shouting* upstream. Try to remove any
extra splitters and such and make sure you have RG6 cable and tight
connections and if no help there, call them out to look into lowering
your upstream.

Andrew Rossmann
05-31-06, 05:17 PM
In article <kbadnYO_t7fqk-DZRVn-ug@adelphia.com>, news@SPAMOLAtodbe.com
says...
> Ron W wrote:
>
> > Thanks for your help.
> > My levels: Downstream = -6 dBmV
> > Upstream = 54 dBmV.
> > I still want to reduce losses to get the downstream level up closer to
> > mid-range.
>
> I'd be more worried about your *shouting* upstream. Try to remove any
> extra splitters and such and make sure you have RG6 cable and tight
> connections and if no help there, call them out to look into lowering
> your upstream.

In some cases, you may be able to use a tab instead of a splitter. For
a tap, the 'out' port will have little to no loss. The 'tap' port will
have 6db or so of loss (a splitter typically has 3.5db loss on both
output ports). That may be OK for analog TV's or even digital if the
signal is strong enough.

--
If there is a no_junk in my address, please REMOVE it before replying!
All junk mail senders will be prosecuted to the fullest extent of the
law!!
http://home.att.net/~andyross

lawrence.jones@ugs.com
06-01-06, 03:11 PM
Andrew Rossmann <andysnewsreply@no_junk.comcast.net> wrote:
>
> In some cases, you may be able to use a tab instead of a splitter. For
> a tap, the 'out' port will have little to no loss.

There's no such thing as a free lunch. Unless one port has no signal at
all, there's always going to be *some* loss at both ports.

-Larry Jones

Hmm... That might not be politic. -- Calvin

Roy
06-01-06, 09:17 PM
On Tue, 30 May 2006 13:59:50 GMT, no@spam.invalid (Ron W) wrote:

>Sorry I can't help -- I started having similar problems a couple of
>days ago with my Motorola SB 5120 -- occasionally "Send
>Channel" light flashes. I suspect I can improve my situation
>with a little reduction in cable losses.
>My question: How do you access the cable signal levels? Is it
>available via a URL?
>Thanks.


go to 192.168.100.1 from your browser, you should get the modem
configuration manager. You cah look at signal and other things there.

Roy

bbassett6
06-30-06, 03:13 PM
I bought a new computer for my wife and the trouble still existied so I bought a new SB520 surf cable modem. It keeps disconnecting and reconnecting on its own when ever it pleases.

Downstream Value
Frequency 591000000 Hz
Signal to Noise Ratio 31 dB
QAM 256
Network Access Control Object ON
Power Level -15 dBmV

Upstream Value
Channel ID 4
Frequency 34000000 Hz
Ranging Service ID 4009
Symbol Rate 2.560 Msym/s
Power Level 58 dBmV

I guess this falls into the shouting upstream as well. I have the cable coming in toa 4 way split to different rooms. Out of the living room of one leg, is another split going to TV and cable modem. I am going to try to get rid of a split and see if it gets better.

john_crowley
07-03-06, 07:56 AM
I have a Comcast high speed connection, and am using a SurfBoard 5120 cable modem. Over the past few months, I've lost service on average 10 hours per day. Comcast has been out several times, and I've been told everything from the fact that I have too many splitters installed on the line (I recently added a new room added, and as part of it, had several rooms wired for cable tv), to the fact that I need to terminate the unused wall outlets with an "end cap" or "ethernaet terminal plug", to I need a signal enhancer/repeater. The electrciain has come back several time as well, and installed a repeater, but comcast told me that this is useless, i that the device enahnces the signal and the interference. In any event, it doesn't work. My faith in my electrician is less than my faith in the Comcast, but at this point I'm at a loss as to what I should do.

The diagnostics for my cable modem are as follows:

Downstream

Frequency 555000000 Hz
Signal to Noise Ratio 35 dB
QAM QAM256
Network Access Control Object ON
Power Level 1 dBmV

Upstream

Channel ID 4
Frequency 21600000 Hz
Ranging Service ID 6834
Symbol Rate 2.560 Msym/s
Power Level 58 dBmV

Are these values acceptable? Any help/insight would be greatly appreciated!

BradJohnson2
07-19-06, 12:16 PM
I too have started having problems with my Comcast/cable modem in the last two months. It had been working great for the last 8-10 months. The problem has become progressively worse since it started back in May. I get timeouts while surfing the web, which get progressively more frequent until I cycle power. At first, a power cycle would keep me trouble-free a week, now it's about a day.

I finally got around to having Comcast out and, of course, all is good on their end. The tech did "clean up" the taps and drip loop(s) outside, which corrected a my high upstream power reading (was 55-55dBmV, now a solid 46dBmV), but my downstream power remained low at around -9 to -11dBmV. Of course he was an hour early in getting to my house, so I missed him and now I don't know what my readings are inside, except what the SB5100 tells me. I tried disconnecting my cable tv drop, but that didn't help.

Comcast said while the downstream is pretty-much at the limit of acceptable signal level, but it is still acceptable. He suggested my cable modem was to blame and recommended I purchase a new modem and try it.

I did notice that my cable modem was a little warm, so I went to Walmart and bought a 7" clip-on fan for $7. My downstream power is now -7 to -8dBmV and my timeout problems have disappeared. It would also explain why the problem started in May and has become progressively worse (my basement has become warmer with the summer heat). I did take the case apart, but the electronics looked pretty clean, so it's not a dust build-up issue. For now I'm just going to keep the fan on it.

Hope this helps somebody else.

-Brad

juxtapos99
07-21-06, 06:58 PM
I recently got 8 Mbps service from Comcast, but I was having sporadic outages over the past two weeks. A tech came today and he replaced my RCA DCM245 with a Motorola SB5101. The problem is fixed for now.

The tech measured my cable signal with a tester and said my line was fine. Here's my modem info from 192.168.100.1 if this is helpful.

Frequency 615000000 Hz
Signal To Noise Ratio 33.0 dB
Power Level -5.1 dBmV

Channel ID 2
Frequency 30000000 Hz
Power 28.5 dBmV

The cool thing is my speed jumped from around 8 Mbps to 20+ Mbps!! The upload stays at around 765 kbps. So I guess my problem was having a modem that wasn't DOCSIS 2.0 compliant. How fast is everyone else's connection?

http://www.speakeasy.net/speedtest/

(I live in D.C. so I picked the D.C. server to test. All the other servers are much slower for me.)
Last Result:
Download Speed: 19974 kbps (2496.8 KB/sec transfer rate)
Upload Speed: 717 kbps (89.6 KB/sec transfer rate)

Last Result:
Download Speed: 25487 kbps (3185.9 KB/sec transfer rate)
Upload Speed: 718 kbps (89.8 KB/sec transfer rate)

steve
08-08-06, 05:41 PM
lawrence.jones@ugs.com wrote in news:vio3l3-1mk.ln1@jones.homeip.net:

> Andrew Rossmann <andysnewsreply@no_junk.comcast.net> wrote:
>>
>> In some cases, you may be able to use a tab instead of a
splitter.
>> For
>> a tap, the 'out' port will have little to no loss.
>
> There's no such thing as a free lunch. Unless one port has no
signal
> at all, there's always going to be *some* loss at both ports.
>
> -Larry Jones
>
> Hmm... That might not be politic. -- Calvin
>

You are right a tap, or a directional coupler is simply a splitter
that
has a bias on one of the through legs, usually 1 but it increases
with
the frequency, as much as 3 on 860 MHz. Usually a DC has a value of 6
or
9 as a normal 2 way splitter has a value of 3.5. You want to use the
TAP
leg as the minimal drop leg. 53 on the test subjects modem is fine,
they
can go as high as 63.

seyeklopz
08-09-06, 05:22 AM
My connection cuts out every 5 -50 minutes or never, depending on time of day. It only cuts out for 10 seconds or so, but it's hell when I'm trying to play World of Warcraft.

Rogers Extreme Speed Cable Internet (6Mbit/1Mbit), Motorola Surfboard

Frequency 615000000 Hz Locked
Signal to Noise Ratio 39 dB
Power Level -1 dB
Channel ID 3
Frequency 31296000 Hz Ranged
Power Level 39 dBmV
Frequency Plan: North American Standard/HRC/IRC
Upstream Channel ID: 3
Frequency (Hz): 615000000
DHCP Server Enabled
1970-01-01 00:00:30 3-Critical 0x040D9A2C DHCP WARNING - Non-critical field invalid in response.
1970-01-01 00:00:15 3-Critical 0x04E33948 No Ranging Response received - T3 time-out
2006-08-01 05:58:36 3-Critical 0x040D9A2C DHCP WARNING - Non-critical field invalid in response.
2006-08-01 05:58:25 3-Critical 0x04E33A10 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 timeout
2006-08-01 05:58:10 3-Critical 0x0501BE90 SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
2006-08-01 05:40:21 3-Critical 0x040D9A2C DHCP WARNING - Non-critical field invalid in response.
2006-08-01 05:40:18 3-Critical 0x040D9964 DHCP FAILED - Discover sent, no offer received
2006-08-01 05:40:04 3-Critical 0x04E33A10 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 timeout
2006-08-01 05:39:46 3-Critical 0x0501BE90 SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
2006-07-31 17:07:53 5-Warning 0x040DC13C DHCP RENEW WARNING - Field invalid in response
1970-01-01 00:00:15 3-Critical 0x040D9A2C DHCP WARNING - Non-critical field invalid in response.
2006-07-25 17:09:06 3-Critical 0x0501BD64 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing


Is it bad modem, or problem with service?

sgoldman@eatonhall.com
08-09-06, 10:02 PM
I had Comcast out this week for my chronic connectivity issues.
The tech said the Motorola modems (mine's a Surfboard 5100) are set to
shut themselves off at 54dB upstream. When the upstream power is high,
says my tech, the problem is at the pole and Comcast needs to come out
and 'rebalance' their side. So while going to a tap (good suggestion!)
or disconnecting your splitter will buy you a few dB to stay online,
you need to get Comcast out there to do their side of the pole.

I demanded a second cable drop (a dedicated coax run from the pole to
my modem, separate from the TV cable into my house) last year when I
had similarly frustrating cable issues.

The good news: Verizon is wiring my neighborhood (Livingston, NJ) for
fiber-to-the-house, and should be turning on the switch for their
verizonfios service here in the next two months, according to the techs
working on the street. As soon as that happens, it's goodbye Comcast
for me. Say what you will about the phone company, but my dial tone
never drops, and my cable is out at least twice a month. Ciao,
Comcast!!!

wazlo
10-03-06, 03:07 PM
My connection cuts out every 5 -50 minutes or never, depending on time of day. It only cuts out for 10 seconds or so, but it's hell when I'm trying to play World of Warcraft.

Rogers Extreme Speed Cable Internet (6Mbit/1Mbit), Motorola Surfboard

Frequency 615000000 Hz Locked
Signal to Noise Ratio 39 dB
Power Level -1 dB
Channel ID 3
Frequency 31296000 Hz Ranged
Power Level 39 dBmV
Frequency Plan: North American Standard/HRC/IRC
Upstream Channel ID: 3
Frequency (Hz): 615000000
DHCP Server Enabled
1970-01-01 00:00:30 3-Critical 0x040D9A2C DHCP WARNING - Non-critical field invalid in response.
1970-01-01 00:00:15 3-Critical 0x04E33948 No Ranging Response received - T3 time-out
2006-08-01 05:58:36 3-Critical 0x040D9A2C DHCP WARNING - Non-critical field invalid in response.
2006-08-01 05:58:25 3-Critical 0x04E33A10 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 timeout
2006-08-01 05:58:10 3-Critical 0x0501BE90 SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
2006-08-01 05:40:21 3-Critical 0x040D9A2C DHCP WARNING - Non-critical field invalid in response.
2006-08-01 05:40:18 3-Critical 0x040D9964 DHCP FAILED - Discover sent, no offer received
2006-08-01 05:40:04 3-Critical 0x04E33A10 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 timeout
2006-08-01 05:39:46 3-Critical 0x0501BE90 SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
2006-07-31 17:07:53 5-Warning 0x040DC13C DHCP RENEW WARNING - Field invalid in response
1970-01-01 00:00:15 3-Critical 0x040D9A2C DHCP WARNING - Non-critical field invalid in response.
2006-07-25 17:09:06 3-Critical 0x0501BD64 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing


Is it bad modem, or problem with service?

I'm having the exact same problem. Motorola SB5120 modem, Comcast high-speed. Getting randomly disconnected. Sometimes I play for an hour or more without problems. Others, I lag badly and get disconnected several times an hour. If you've had any luck fixing it, please let me know.

I'm going to try some of the ideas listed earlier in the thread (moving the modem away from the outlet and the outlet strip and also putting a fan on it). I'm also going to go the address listed earlier and see what kind of results I get. I will post them when I get home. I'd love to get this taken care of. It is extremely frustrating when trying to play with others online.

kiranj
10-14-06, 12:00 PM
I am having similar issue.. I am using Motorola SB5120 modem, Comcast high-speed

While using my sunrocket voip phone, the phone goes silent for about 10-15 seconds for every 30 sec.. this is really frustating as I can hear the other party speaking but they cannot hear me speaking.. clearly, the downstream is fine but the problem with upstream...
here are my settings:

Downstream Value
===================
Frequency 709784000 Hz
Signal to Noise Ratio 34 dB
QAM QAM256
Network Access Control Object ON
Power Level 4 dBmV
The Downstream Power Level reading is a snapshot taken at the time this page was requested. Please Reload/Refresh this Page for a new reading

Upstream Value
=================
Channel ID 8
Frequency 24000000 Hz
Ranging Service ID 961
Symbol Rate 2.560 Msym/s
Power Level 48 dBmV


Appreciate any help in debugging this issue..

kiranj
10-14-06, 12:01 PM
Motorola SB5120 modem, Comcast high-speed.

Abyssmal
10-23-06, 06:55 PM
hi everyone, i found this site through google, and to be honest i seem to be having the same issues as everyone else in this thread...there seem to be alot of knowledgable people here so hopefully you can help me out

in the thread i read where to get the modem signal information, and this is what i got

Frequency 693000000 Hz
Signal to Noise Ratio 34 dB
QAM QAM256
Network Access Control Object ON
Power Level -2 dBmV

Upstream Value
Channel ID 2
Frequency 32000000 Hz
Ranging Service ID 1797
Symbol Rate 2.560 Msym/s
Power Level 50 dBmV

i know absolutely NOTHING about cable or anything like that, all i know is that when i'm surfing the web, it'll just stop transferring, and when i play online, in my case WoW, i'll just stay there lagging, but everyone else is moving normal and whatnot. and my ping will go through the roof...from about 200ms to 2500-7500ms

cable has been great to me until about a month ago...i dont' want to go back to dsl :'(

any help or tips would be greatly appreciated

Alyx430
11-15-06, 11:00 AM
Both your upstream and downstream are borderline too high and low, respectively.

Downstream should be between -15 and +15
Upstream (bare minimum) should be anywhere from mid thirties to AS HIGH AS 58 but 58 is pushing it depending on the cable standards for your server, so really it should be slightly lower.

Also the internet requires a TON of signal and it needs to be perfect - the line going to the modem should be split NO MORE THAN once.

Buy a two way splitter and split the line coming into the house. put one split to the modem, and then run the other split to your 4 way and split that to your tvs. That way your cable modem gets 50% of the signal coming into your house at all times.

Also, make sure you are using rg6 cabling and high quality splitters.


I bought a new computer for my wife and the trouble still existied so I bought a new SB520 surf cable modem. It keeps disconnecting and reconnecting on its own when ever it pleases.

Downstream Value
Frequency 591000000 Hz
Signal to Noise Ratio 31 dB
QAM 256
Network Access Control Object ON
Power Level -15 dBmV

Upstream Value
Channel ID 4
Frequency 34000000 Hz
Ranging Service ID 4009
Symbol Rate 2.560 Msym/s
Power Level 58 dBmV

I guess this falls into the shouting upstream as well. I have the cable coming in toa 4 way split to different rooms. Out of the living room of one leg, is another split going to TV and cable modem. I am going to try to get rid of a split and see if it gets better.

rioplata
06-09-07, 11:05 PM
I am noticing that my internet connection is sporadic.
All of a sudden I would be surfing the net and the would get a page not available error. I would start downloading a file that is about 500MB - and then would noticed that I get - connect reset to server.

My VoIP quality is horrendous as I often have the problem that I can hear the other person, but they cannot hear me, and vice versa.

I checked the routers info:

Downstream Value
Frequency 561000000 Hz
Signal to Noise Ratio 35 dB
QAM QAM256
Network Access Control Object ON
Power Level 7 dBmV The Downstream Power Level reading is a snapshot taken at the time this page was requested. Please Reload/Refresh this Page for a new reading

Upstream Value
Channel ID 12
Frequency 28300000 Hz
Ranging Service ID 2854
Symbol Rate 2.560 Msym/s
Power Level 42 dBmV

Can anyone tell me if these are within acceptable range?

Thanks!

GrandMoff
07-29-07, 07:26 PM
Frequency 591000000 Hz
Signal to Noise Ratio 35 dB
QAM QAM256
Network Access Control Object ON
Power Level 0 dBmV The Downstream Power Level reading is a snapshot taken at the time this page was requested. Please Reload/Refresh this Page for a new reading


Upstream Value
Channel ID 3
Frequency 19000000 Hz
Ranging Service ID 6192
Symbol Rate 2.560 Msym/s
Power Level 55 dBmV


Get some major packet loss every few minutes.
The line is split only once with an ar 2 way splitter.
I have tested it just one machine connected to the modem.
Time to change modems? any suggestions?

inferno3387
07-31-07, 07:50 PM
I am having the same problems with my Surfboard modem. When it gets up to 55dm upload, my internet will crash...

What should I do? Its been happening for many months now, and I can't get it fixed. Their techs have come out about 5 times in 2 months, and its still not fixed...

Help??

xazurianx
08-03-07, 05:09 PM
I've been having the same issues as everyone else in this thread, sadly.

TimeWarner RoadRunner HighSpeed Internet.
My connection drops anywhere from every 5 minutes, to once every 5 hours. Also, it may stay disconnected (even through the text-book hard resets) from 15 seconds to 6 hours at a time. It's even worse then the latter of the two scenarios happen 2-3 times a day...

I've had the Time Warner Techs out here 9 times in the past 2 months. They've diagnosed the problem as everything from a bunk splitter, bad modem, internal house wiring, etc. So far it's never been anything on 'their' end...

Today I had a tech come out, test the levels etc. All was well at the time. He ran a 'dedicated' line to the modem. After he left, I found out that it wasn't dedicated. He just moved the splitter from the upstairs attic (our little phone/cable wiring hub), to the box outside! I was under the impression the new line was meant to be connected at the pole 20 feet from my back porch.

Diagnostics are as follows!

Downstream Value
Frequency 597000000 Hz Locked
Signal to Noise Ratio 32 dB
Power Level 0 dBmV
The Downstream Power Level reading is a snapshot taken at the time this page was requested. Please Reload/Refresh this Page for a new reading

Upstream Value
Channel ID 2
Frequency 31984000 Hz Ranged
Power Level 51 dBmV

Time Priority Code Message
2007-08-03 16:01:33 3-Critical R005.0 Started Unicast Maintenance Ranging - No Response received - T3 time-out
1970-01-01 00:00:16 3-Critical D003.0 DHCP WARNING - Non-critical field invalid in response.
1970-01-01 00:00:09 3-Critical R005.0 Started Unicast Maintenance Ranging - No Response received - T3 time-out
1970-01-01 00:00:24 3-Critical R007.0 Unicast Ranging Received Abort Response - Re- initializing MAC
1970-01-01 00:00:11 3-Critical R005.0 Started Unicast Maintenance Ranging - No Response received - T3 time-out
1970-01-01 00:04:29 3-Critical R007.0 Unicast Ranging Received Abort Response - Re- initializing MAC
1970-01-01 00:04:08 3-Critical T001.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
1970-01-01 00:04:07 3-Critical T002.0 SYNC Timing Synchronization failure - Failed to acquire FEC framing
1970-01-01 00:04:07 3-Critical T001.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
1970-01-01 00:04:07 3-Critical T002.0 SYNC Timing Synchronization failure - Failed to acquire FEC framing
1970-01-01 00:04:07 3-Critical T001.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
1970-01-01 00:04:06 3-Critical T002.0 SYNC Timing Synchronization failure - Failed to acquire FEC framing
1970-01-01 00:04:06 3-Critical T001.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
1970-01-01 00:04:00 3-Critical T002.0 SYNC Timing Synchronization failure - Failed to acquire FEC framing
1970-01-01 00:03:59 3-Critical T001.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
(This continues on and on and on)

-------

Just got off the telephone with a 'Technical support team leader" at TimeWarner. I was refused an account credit, even though the log showed I had lost a connection for a total of 240 hours in the past month! Naturally, I was told to calm down and refrain from cursing.

So, could any evaluate my above diagnostics for me? It would be so appriciated, as I'm extremely worn out right now. Can't keep track of my thoughts long enough to go over them myself.

happysingh
08-05-07, 03:24 PM
Hello,
This is very frustating , Go buy AMP from home depot and add it to main line, you will be happy as ever.
Thanks

xazurianx
08-09-07, 12:35 AM
I've replaced all splitters, reran the cable from the outside hub to the modem, etc. I noticed that in my modem log, neither the upstream or downstream frequency is "Locked" or "Ranged", as they should. If I understand correctly, unless they are locked and ranged, the levels are all but valid. At the moment I'm trying to determine how to lower my upstream levels from a capped 58dBmV, to around a 50 or less. The trick? All of this done without recontacting my local Cableco office AGAIN.

The last tech to visit came yesterday, and told us since they were so stumped (entry level techs here. No significant knowledge other than running coax), it must be something we're doing horribly wrong, and that they would not provide us with any more cable, another splitter, another test, or another modem until we fix the problem. In essence: they are extremely lazy and don't want to take the time to find the issue.

couchmiester
09-28-07, 05:42 AM
I've been reading alot of threads about cable signal time outs and splitters. Here is what I've been experiencing for the past 4 months. It all started in June 2007, my connection started going on and off, sometimes staying off for hours at a time. I called the cable service dept and was told that they were seeing no problems. I should point out that I am in Arkansas and the cable service dept is in Kansas. The tech did a supposed signal check of my modem and said the signal was not being recieved. (duh, I thought) The tech suggested that I reboot my modem, which I had done several times before calling. When that didn't help, he suggested that I connect my modem directly, also of which I had already done before calling. This still didn't help and in the process of reconnecting everything, the modem decided to connect, which the tech promptly alerted me to the fact that the modem was online again, and said if I need anything more to just call. 1st call, no real help. (my cat could have been better help) Second call to the tech dept was 3 days later. Cable connection was still doing the same thing. This tech had me do the same things as the one before. After all that, the tech said they would send a field tech to my home to look at the problem. Field tech came one week later. He tested my modem(was good), my cabling and connections(were also good) and did a line test. He determined that the problem was in the line coming to my home, and said they would have a line tech come out and look at the problem.(no line tech ever showed). Third call was 2 weeks after tech visit, same old song and dance, they arrainged for a tech to visit in 3 days. This tech was more accomidating than the first, he first replaced the standard, run of the mill, splitter that came with the cable modem with an Antronix 5-1000MHz (old one was 5-900MHz) two-way splitter (-3.5dB on both outputs) model # CMC2002H-A. Also he replaced my cables and put newer and better connectors on the existing cables. He also advised me to not run the cable going to my modem through my surge protector. He also did line tests and determined the same as the first tech, problem in cable co. lines. He called in for a line tech, but one never showed. Time elapsed, about a month and a half, and still paying full price for nothing(as in not getting cable service) Forth call, 2 months after initial call, and after complaining in person to the cable billing office. I'll spare you the details and just say that they sent another tech to my home. This tech looked over all the cabling and connectors(the ones that the previous tech made and installed) and did a line test on them as well as my modem.(he found no probs with any of that) He replaced the splitter(which was just replaces about 2 weeks prior) with an Antronix model # CMCDT2106T-A tap(not splitter) output -120dB RFI, 5-1000MHz. This model has an in, an out and a tap(tap is for TV). He also determined that the main cable line coming to my home was the problem, he schedualed a line tech, but one never showed. Fifth and final call, after once again complaining in person to billing dept.(this time I finally got some satisfaction) They gave me a discount on my August bill(half cost), and did not charge me for September(still waiting for October bill). Forth and final tech that was sent to my house did most of the line tests on the lines outside of my home, he also said the prob was with the main cable line, mostly the amplifier box on the pole just before my home. Should I say it, no line tech has come out to look at or fix it as of yet. What does this all come down to? 3 different types of splitters(2splitters and a tap), new cabling and connections, 4 field techs, yet problem not solved. What is my cable company? Cox cable. What do I think of them? Before this, thought very highly of them, after all this, wouldn't recommend them to my worst enemy. Just to let you know, I'm no novice, I'm a Certified Electronics Technician(I passed the test with high marks), a certified computer service tech, and have an Associates of Applied Science degree in Electronics Technology. I also have a Bacholors degree in industial operations and certificates in PLCs(Programable Logic Controlers), motor drive systems, industrial electronics, and industrial maintenance. I hope that the rest of you get better satisfaction with getting your connection problems fixed than I have had with mine. SpeedGuide, please mark down another negetive vote against Cox Communications.

Thank you all for letting me vent my frustration.

P.S. I should point out that before the installation of the CMCDT2106T-A tap, I was getting this error all the time, 1970-01-01 00:04:08 3-Critical T001.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing. With the tap, I no longer get that error.

BjamesT
09-16-08, 02:29 PM
Well, I don't feel so alone.

I'm posting from work, so I don't have my numbers and logs in front of me, but since the numbers don't seem to be getting anyone anywhere, I don't see that it matters.

I'm with Rogers in Toronto, only been since mid-July '08.
Problem started right away; online, slow to stop, then blinking lights.
Power cycle works sometimes, Rogers Tech said to power cycle and reseat the coax to "clear the line", which works, but is a royal pain to execute 4-5 times a day.
Had tech guy in the other day, said i had bad splitter, installed new one "this one has a chip in it!". Gave his personal guarantee that the problem would go away (but not his cell #). Problem persists. Call Rogers, they notice the modem is offline, have me go through the reset procedure and say "there you go, you're online now". So I tell them that I don't really feel like calling in every time it goes down, but I will, and currently their "always on" advertising message is a little short of the truth. So we go through the whole setup, I say I think there's an intermittent problem at the hub outside, or with a line, connector or something like that and he says there's no way (Interesting, since he can't see the setup from his desk...).
Then proceeds to tell me that the only thing it could possibly be is my wireless router going offline. I tell him I run tests on it frequently, and even when the modem is offline, the router is green-to-go, as the network is working fine. (Apple Airport Express). I explain to him that for the past 2 years, I had this same router running alongside a (I think, can't be sure since it worked and never had to look at it) Scientific American cable modem from Cogego in another area of the province with no problems whatsoever. He tells me, still, that it is my wireless router which is causing their modem to go offline, and that the Apple wireless routers are not supported by Rogers, but that they do sell wireless... CLICK.

Is it possible for a 802.11 g Apple Airport Express wireless router to cause a Motorola SB5101 modem to repeatedly go down?

TJude
05-04-09, 01:59 PM
Does any of this help any?

/////////////////////////////
Downstream Value
Frequency 687000000 Hz Locked
Signal to Noise Ratio 36 dB
Power Level -10 dBmV
The Downstream Power Level reading is a snapshot taken at the time this
page was requested. Please Reload/Refresh this Page for a new reading

Upstream Value
Channel ID 3
Frequency 31000000 Hz Ranged
Power Level 52 dBmV
////////////////////////////////////

ERROR LOG
Time Priority Code Message
2006-05-10 13:34:47 3-Critical R005.0 Started Unicast Maintenance
Ranging - No Response received - T3 time-out
2006-05-10 12:24:22 3-Critical R002.0 No Ranging Response received -
T3 time-out
2006-05-10 12:23:57 3-Critical T001.0 SYNC Timing Synchronization
failure - Failed to acquire QAM/QPSK symbol timing
2006-05-10 12:23:43 3-Critical D005.0 TFTP failed - request sent -
No Response
2006-05-10 12:22:33 3-Critical R007.0 Unicast Ranging Received Abort
Response - Re- initializing MAC
2006-05-10 12:21:54 3-Critical R002.0 No Ranging Response received -
T3 time-out

How do you get this?

OJSimpson7
05-18-09, 09:34 PM
Hello,
This is very frustating , Go buy AMP from home depot and add it to main line, you will be happy as ever.
Thanks

the amp is the worst thing to do... if you've got a bad signal and you amp it, you also amp the noise. Just fix the problem. Downstream between an +8 and -8, upstream under 50dbmv to make sure you'll be online. They'll work out of that range but the levels will fluctuate with weather and temperature which is why a 56 upstream gives intermittent issues. make sure the modem is off a 2way right from the drop. If you call out a tech, ask for the levels and make sure they're in that range or don't let him leave.

MelodicMizery
11-08-11, 04:59 PM
hey everyone i know this is a old thread but i googled my problem and found this thread and im having this same exact problem! im shocked at how many years this has been going on with no solution!!!!!!!!!

where do i start oh man this is going to be a long one, ok let me say first it is now november 2011, my internet has been disconnecting this entire year i can remember it disconnecting in january but i just delt with it i didnt have time for cable to come out and it was only disconnecting about 6-10 times a day. in april it got so bad i couldnt stand it anymore i was being disconnected 4 times repeatedly every 5 to 15 minutes, about what seemed to be about 100 times a day. over and over ive delt with stupid morons and technicians and supervisors all not knowing what there doing and using every excuse in the book!

what is very frusterating is i have time warner, it takes about a week for them to send someone out, they cant send a line man out without sending a guy to come in your house first and approving it, so it takes a week for him to come and then a few more days for the next they say i fixed the problem and i said what you just did isnt going to solve it they say yes it will, as soon as they leave it disconnects in 15 minutes and then im back to square 1 again trying to get someone out here. no one will tell me what there doing on the pole so i cant relay the info to the next person. finally i get the head of the techs out here, he runs around and cant find the problem i see he wants to leave and is stumped, so he says i have to check your electrical wires in the basement can i hook up with your landlord? im like what does that have to do with anything? so basically he comes back and right away says you have to replace your entire electrical wiring in your whole house. what he ment to say is i have no clue what im doing let me give you this excuse to keep you away for a while. he says we arent going to do anything until you do that. so then i was at a dead freeze. so i called corporate hq in new york, they sent him right back out here with another tech, this new guy found a rip in the fiber. they fixed it my problem got worse. i can go on and on with these storys of the stuff they did that didnt work. theyve replaced all my wiring in my house ive got 6 diff modems from them to make sure it wasnt that, i have no splitters they ran all new wiring from the pole to inside. so after tht guy leaves the next day it just starts working, it worked for 2 weeks no disconnections. all of a sudden it just starts disconnecting again, thats when they said there was a tear in the fiber. im afraid to even have them mess with it again because its only disconnecting 10 to 15 times a day which i can tolerate im afraid that its going to get bck to the 100 times a day when they touch it because thats what happens. and then randomly it just fixs itself, since april it worked for one whole month without disconnections, and then the 2 weeks a little bit ago it worked pretty good. other then that my modem disconnects and resets itself all the time! i cant game at al on my ps3, any work i do online i lose when i click send.

ive heard so many excuses, im also noticing when it rains it acts up the worse and it almost seems like something is getting wet and messing up for a few days till it drys out. they also said 2 nodes were blown out, they said everyone in the neighborhood was disconnecting then they also said someone in another city is having the same problem, then other techs come out and say im lying and all this other garbage to get me to keep paying my bill and believe its my fault and other techs will come right out and really try to help me. some techs have no clue what there doing i look out the window and there hiding on the side of my house for 20 minutes not doing anything then they come in and say i couldnt find a problem im like dude i just watched you for 20 minutes! my file at time warner is as thick as the bible, they have a huge history of my disconnections and calls of people coming out trying to fix my problem

i wish i could just change companys but i live in cleveland the poorest city in america, since theres less money here its less likely we can afford cable itnernet so the government picked us last to get fiber optic from verizon and other companys, the only thing we have is time warner, and att and i can see att equipment dangling from the pole if i look at the window it looks like something from back to the future about to electricute someone into 2099.

i have no clue what to do except move at this point. a nice tech came out today and gave me his number he said he was going to go back to the office and monitor me thru the computer and see what he can find out to fix. hes the first person to do that for me he said hes going to stick with me to figure this out. everyone else has kicked me t the curb and said problem solved. they even sent this one mexican guy here 6 times and i had to finally request they stop sending him because he would just come here and say u have no problem and then leave and mark my case as closed!

MelodicMizery
11-08-11, 05:08 PM
i just found this page which is describing exactly what is happening to me

http://homepage.ntlworld.com/robin.d.h.walker/cmtips/signal.html

MelodicMizery
12-05-11, 07:55 AM
a month later and im still disconnecting...time warner supervisors have told the employees to not even help me now