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Marco
04-25-09, 07:46 AM
How much does my older cable modem affect download speed?

How much speed loss would be expected from a wireless router in the
mix?

I'm thinking of down-tiering to Comcast 1 Mbps service (we do very
little video) would I expect a similar percentage drop?

thanks

====================
from my post at alt . online-service . comcast
original:
download speed testing

I get around 4.5 to 5.5 Mbps using these:

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

but only get 2.7 to 3 Mbps using this site:
http://www.speedtest.net/index.php

according to Comcast I should be getting 6 Mbps

Anybody test lately and which sites seem more believable?

(should I complain that I don't get 6 Mbps)

note:
upload speed seems more consistent around 1 Mbps
It seems that the chosen server for each test excessively influences
the test

a response:

> Old modem? Post modem model and version numbers
> "IF" your modem supports it check signal power and snr athttp://192.168.100.1/
> If you get the right person when calling Comast they might check your
> signal levels from their end if your modem doesn't support it..

my followup:

SurfBoard 3100 appears to be DOCSIS 1.1

Downstream Value
Signal to Noise Ratio 37 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
(this did not change on refresh)

Upstream Value
Power Level 56 dBmV

what is a good reading?

Ken Whiton
04-26-09, 12:14 AM
*-* On Sat, 25 Apr 2009, at 05:46:49 -0700,
*-* In Article
aaf8eb44-f40e-4a63-a099-f4d8d80debbd@y6g2000prf.googlegroups.com,
*-* Marco wrote
*-* About Modem model versus download speed?

> How much does my older cable modem affect download speed?

Probably not much. According to
<http://www.speedguide.net/faq_in_q.php?category=92&qid=170>, the
changes in DOCSIS 2.0 over DOCSIS 1.1 are on the upstream channel.
There's no mention of any enhancements to the downstream channel.
Furthermore, <http://en.wikipedia.org/wiki/DOCSIS#Speed_Table> lists
the same downstream "Maximum usable speed" for both versions.

> How much speed loss would be expected from a wireless router in the
> mix?

> I'm thinking of down-tiering to Comcast 1 Mbps service (we do very
> little video) would I expect a similar percentage drop?

That's the service level I have.

> ====================
> from my post at alt . online-service . comcast
> original:
> download speed testing

> I get around 4.5 to 5.5 Mbps using these:

> http://speedtest.comcast.net/

On three tests I get 0.875, 0.900, and 0.872 Mbps download speed,
and 0.365, 0.364, and 0.362 Mbps upload speeds, using their Boston,
Mass., server, the one closest to me.

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

928, 929, and 880 Kbps download, 360, 365, and 191 Kbps upload,
using New York City.

> but only get 2.7 to 3 Mbps using this site:
> http://www.speedtest.net/index.php

0.87, 0.87, and 0.90 Mbps download, 0.36, 0.36, and 0.36, upload,
using Portland, Maine. As you can see, my results there are right in
line with the other two, so I don't know why yours are so much slower
than the others.

Note that I have a router, and I'm streaming Internet radio to my
other computer, so I know that these tests aren't getting the full
benefit of my available bandwidth.

> according to Comcast I should be getting 6 Mbps

If you read the fine print you'll find that that's *UP TO* 6 Mbps.

> Anybody test lately and which sites seem more believable?

> (should I complain that I don't get 6 Mbps)

> note:
> upload speed seems more consistent around 1 Mbps
> It seems that the chosen server for each test excessively
> influences the test

> a response:

>> Old modem? Post modem model and version numbers
>> "IF" your modem supports it check signal power and snr at
>> http://192.168.100.1/ If you get the right person when calling
>> Comast they might check your signal levels from their end if your
>> modem doesn't support it..

> my followup:

> SurfBoard 3100 appears to be DOCSIS 1.1

Mine is a Motorola SURFboard SB5100, which supports DOCSIS 2.0.

> Downstream Value
> Signal to Noise Ratio 37 dB

36 dB here According to this post, from December, 2004:

http://groups.google.com/group/comp.dcom.modems.cable/msg/e7105dcdc643e030

it should be above 30, so we're both good there.

> Power Level 0 dBmV

4 dBmV here From the same post: "The recommendation is +15 to
-15, so again we're both good. :-)

> 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
> (this did not change on refresh)

> Upstream Value
> Power Level 56 dBmV

49 dBmV here Also from the same post: "Upstream should be below
55db", so you're marginally high there.

> what is a good reading?

From another old thread here is what a poster was told by a Cox
level 2 tech:

Ideal Normal

SNR 30+ mid 30's

Down Power 0 0-3

Up Power 50 or lower 30-50

Ken Whiton
--
FIDO: 1:132/152
InterNet: kenwhiton@surfglobal.net.INVAL (remove the obvious to reply)

Andrew Rossmann
04-26-09, 07:18 AM
In article <aaf8eb44-f40e-4a63-a099-
f4d8d80debbd@y6g2000prf.googlegroups.com>, prenom_nomus@yahoo.com
says...
> How much does my older cable modem affect download speed?
>
> How much speed loss would be expected from a wireless router in the
> mix?
>
> I'm thinking of down-tiering to Comcast 1 Mbps service (we do very
> little video) would I expect a similar percentage drop?
> my followup:
>
> SurfBoard 3100 appears to be DOCSIS 1.1

It should be more than enough for the 1M service. The 3100 is ancient.
Although DOCSIS 1.x and 2.x support up to 38M down, many older modems
don't have enough horsepower to actually push data that fast. I used to
have an RCA that peaked at 5M.

--
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

1PW
04-28-09, 02:37 AM
On 04/25/2009 05:46 AM, Marco sent:
> How much does my older cable modem affect download speed?

Probably not the slightest bit noticeable.

>
> How much speed loss would be expected from a wireless router in the
> mix?

Again - next to nothing.

>
> I'm thinking of down-tiering to Comcast 1 Mbps service (we do very
> little video) would I expect a similar percentage drop?

This could be a fine economic step.

>
> thanks
>
> ====================
> from my post at alt . online-service . comcast
> original:
> download speed testing
>
> I get around 4.5 to 5.5 Mbps using these:
>
> http://speedtest.comcast.net/
> http://www.speakeasy.net/speedtest/

Make sure that you select site(s) that are close to your location.
Multiple tests from several test sites would be good.

>
> but only get 2.7 to 3 Mbps using this site:
> http://www.speedtest.net/index.php
>
> according to Comcast I should be getting 6 Mbps
>
> Anybody test lately and which sites seem more believable?

Sometimes I peak at close to 22Mbps down & 1.0+ up.

>
> (should I complain that I don't get 6 Mbps)

Make many tests between your location and a nearby speed test near
Tucson. These tests should be at various times of the day and days of
the week. If after compiling the results you see your download speed
isn't approaching your tier, it's time to complain. Of course Comcast
will shift the blame to you and your computer system. Be persistent.

>
> note:
> upload speed seems more consistent around 1 Mbps
> It seems that the chosen server for each test excessively influences
> the test
>
> a response:
>
>> Old modem? Post modem model and version numbers
>> "IF" your modem supports it check signal power and SNR at http://192.168.100.1/
>> If you get the right person when calling Comcast they might check your
>> signal levels from their end if your modem doesn't support it..
>
> my follow up:
>
> SurfBoard 3100 appears to be DOCSIS 1.1

My older Linksys DOCSIS 1.1 modem is seeing 22 Mbps downloads.

>
> Downstream Value
> Signal to Noise Ratio 37 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
> (this did not change on refresh)
>
> Upstream Value
> Power Level 56 dBmV
>
> what is a good reading?

You have good readings.

<http://www.dslreports.com/faq/5862>

Pete
--
1PW @?6A62?FEH9:DE=6o2@=]4@> [r4o7t]

Marco
05-02-09, 07:45 AM
On Apr 25, 10:14*pm, Ken Whiton <kenwhi...@surfglobal.net.INVAL>
wrote:

> *-* Marco wrote
> *-* About Modem model versus download speed?
>
> > How much does my older cable modem affect download speed?

> > I'm thinking of down-tiering to Comcast 1 Mbps service (we do very
> > little video) would I expect a similar percentage drop?
>
> * * * That's the service level I have.

Do you have VOIP service? We are thinking about getting magic jack
and wondering if the upstream speed would be an issue at the 1 Mbps
service level.

by the way thanks for the previous replies - very helpful

Ken Whiton
05-03-09, 01:08 AM
*-* On Sat, 2 May 2009, at 05:45:12 -0700 (PDT),
*-* In Article
9f7d5e40-95da-4b5b-9128-6edcfacea0dd@j18g2000prm.googlegroups.com,
*-* Marco wrote
*-* About Re: Modem model versus download speed?

> On Apr 25, 10:14 pm, Ken Whiton <kenwhi...@surfglobal.net.INVAL>
> wrote:

>> *-* Marco wrote

>>> How much does my older cable modem affect download speed?

>>> I'm thinking of down-tiering to Comcast 1 Mbps service (we do very
>>> little video) would I expect a similar percentage drop?

>> That's the service level I have.

> Do you have VOIP service?

No.

> We are thinking about getting magic
> jack and wondering if the upstream speed would be an issue at the 1
> Mbps service level.

A little poking, probing, and digging at the magicJack web site
uncovers the following answer to several related FAQuestions:

"A minimum bandwidth UPLOAD speed of 128 kb/s (or kbit/s or kbps) is
required."

http://service.liveperson.net/hc/s-73335289/cmd/kbresource/kb-4150654949807238978/view_question!PAGETYPE?sc=19&sf=101133&documentid=334766&action=view
http://service.liveperson.net/hc/s-73335289/cmd/kbresource/kb-4150654949807238978/view_question!PAGETYPE?sc=19&sf=101133&documentid=335937&action=view
http://service.liveperson.net/hc/s-73335289/cmd/kbresource/kb-4150654949807238978/view_question!PAGETYPE?sc=19&sf=101133&documentid=334771&action=view

Since the upload speed test results I got were almost three times that
value, I wouldn't think it would be a problem.

> by the way thanks for the previous replies - very helpful

You're welcome.

Ken Whiton
--
FIDO: 1:132/152
InterNet: kenwhiton@surfglobal.net.INVAL (remove the obvious to reply)