Comast Trouble(s)

DeputySheriff · Post by **DeputySheriff** » Thu Jan 11, 2007 9:45 pm

Ok, I am new to this site and am in dire need of some opinions on my problems. I have the following equipment at home running in an hybrid network of both wired and wireless.

Cable Modem: Motorola SB5120
Router: Linksys WRV54G

Over the past three months I have had speed connection issues. I pay for the 8mb download and usually have around 10-12mb downloads as tested from various sites around the internet and file downloads. Lately when it's raining outside, or it's cold as in freezing outside like 38 degrees my internet will go from 8-10mb to nearly dialup speeds. I am so tired of fighting with comcast, they want to run a new line on my property which has been an RG-11 and never had a problem until recently. Here is the log from my cable modem:

2007-01-11 21:06:54 7-Information DS multicast is not mapped to SAID
2007-01-11 21:06:54 7-Information B605.10 Map Reject - Downstream Traffic Flow Not Mapped to BPI+ SAID
2007-01-11 21:06:54 7-Information B601.0 SA Map State Machine Started
2007-01-11 19:29:04 3-Critical R02.0 No Ranging Response received - T3 time-out
2007-01-11 16:24:29 7-Information DS multicast is not mapped to SAID
2007-01-11 16:24:29 7-Information B605.10 Map Reject - Downstream Traffic Flow Not Mapped to BPI+ SAID
2007-01-11 16:24:29 7-Information B601.0 SA Map State Machine Started
2007-01-11 16:24:21 7-Information DS multicast is not mapped to SAID
2007-01-11 16:24:21 7-Information B605.10 Map Reject - Downstream Traffic Flow Not Mapped to BPI+ SAID
2007-01-11 16:24:21 7-Information DS multicast is not mapped to SAID
2007-01-11 16:24:21 7-Information B605.10 Map Reject - Downstream Traffic Flow Not Mapped to BPI+ SAID
2007-01-11 16:24:21 7-Information DS multicast is not mapped to SAID
2007-01-11 16:24:21 7-Information B605.10 Map Reject - Downstream Traffic Flow Not Mapped to BPI+ SAID
2007-01-11 16:24:21 7-Information B601.0 SA Map State Machine Started
2007-01-11 16:24:01 7-Information DS multicast is not mapped to SAID
2007-01-11 16:24:01 7-Information B605.10 Map Reject - Downstream Traffic Flow Not Mapped to BPI+ SAID
2007-01-11 16:24:01 7-Information B601.0 SA Map State Machine Started
2007-01-11 16:23:59 7-Information SNMP: Working in SNMP V1/2c Only NmAccess mode
2007-01-11 16:23:59 7-Information B601.0 SA Map State Machine Started
2007-01-11 16:23:58 7-Information INITIALIZATION COMPLETE - MODEM IS OPERATIONAL

Downstream Value
Frequency 711000000 Hz
Signal to Noise Ratio 31 dB
QAM QAM256
Network Access Control Object ON
Power Level 13 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 1
Frequency 30000000 Hz
Ranging Service ID 45
Symbol Rate 2.560 Msym/s
Power Level 46 dBmV

Can anyone please shed some light on what is going on. Is my modem going bad from all these errors, is it a line problem, or something more major at comcast. I have plugged directly into the modem and same results. By morning the signal is so degraded that the modem is off line completely and cannot lock on to a signal.

Thanks for the help.

YARDofSTUF · Post by **YARDofSTUF** » Fri Jan 12, 2007 1:09 am

Was that downstream power level shot taken when your conenction was slow as dial up? If not oen to compare would be helpful, its on the high side of good,a nd the signal to noise ratio is kinda low.

DeputySheriff · Post by **DeputySheriff** » Fri Jan 12, 2007 2:25 am

I am getting alot of page cannot be displayed when trying to see the signal on my cable modem. I have compared to the one posted and the lowest I have seen is 29 where 21 of signal to noise is.

<a href="http://www.speedtest.net"><img src="http://www.speedtest.net/result/73822183.png"></a>

Current LOG ERROR IN MODEM "2007-01-12 01:47:39 3-Critical R02.0 No Ranging Response received - T3 time-out"

YARDofSTUF · Post by **YARDofSTUF** » Fri Jan 12, 2007 3:05 am

They may need to either run a new line or change the power levels on your current one. I wouldnt want a guy on the phone deciding to do a line change, but if a tech came out and tested the line and you told him some of your results and he wanted to rerun the line I could see that. My first guess would be that you need a tech to come out and adjust teh power levels.

DeputySheriff · Post by **DeputySheriff** » Fri Jan 12, 2007 8:23 am

YOS,

I had a tech come out, he was pretty good and listen to me and looked at all the print outs I had, errors, tracerts, pings, and documentation. He found some bad taps out on the pedestal at the road, and ordered some things to be replaced, but that didnt help. He tested my modem and said it was low, and like now when it's normally out in the mornings it's on right now. He said he was going to have an new RG-11 run onto the property but those lines should last 10+ years. Here are the levels this morning and I am pulling a 2-4mb download and spikes higher. I have noticed that my signal page will time out on my modem when you keep refreshing, is this normal? Also, what about the errors the modem keeps receiving?

Downstream Value
Frequency 711000000 Hz
Signal to Noise Ratio 30 dB
QAM QAM256
Network Access Control Object ON
Power Level 14 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 1
Frequency 30000000 Hz
Ranging Service ID 45
Symbol Rate 2.560 Msym/s
Power Level 46 dBmV

YARDofSTUF · Post by **YARDofSTUF** » Fri Jan 12, 2007 12:44 pm

No your modem page shouldn't time out. Are you renting the modem from Comcast? If so replacing the modem would be an easy switch.

DeputySheriff · Post by **DeputySheriff** » Fri Jan 12, 2007 4:29 pm

I replaced my modem this afternoon with a Linksys model modem. Levels are still the same and I am not pulling anything more than 2mb download.

DeputySheriff · Post by **DeputySheriff** » Fri Jan 12, 2007 8:23 pm

NEW MODEM STATS

Status Comment
Acquire Downstream Channel 711000000 Hz Locked
Connectivity State Operational Operational
Boot State OK Operational
Security Enabled BPI+

Downstream Channel

Lock Status Operational
Modulation 256QAM
Channel ID 0
Provisioned Rate 8800 kbps
Symbol Rate 5360.537 Ksym/sec
Downstream Power 6.8 dBmV
SNR 33.2 dB

--------------------------------------------------------------------------------

Upstream Channel

Lock Status Operational
Modulation 16QAM
Channel ID 1
Provisioned Rate 768 kbps
Symbol Rate 2560 Ksym/sec
Upstream Power 48.0 dBmV

Sava700 · Post by **Sava700** » Fri Jan 12, 2007 8:25 pm

downstream looks a little high but not much.. typical -+5 from 0

trogers · Post by **trogers** » Fri Jan 12, 2007 8:36 pm

DeputySheriff wrote:I replaced my modem this afternoon with a Linksys model modem. Levels are still the same and I am not pulling anything more than 2mb download.

What is you ISP given speed? Post your TCP Analyzer results.

DeputySheriff · Post by **DeputySheriff** » Fri Jan 12, 2007 10:13 pm

ISP=Comcast
Download: 8.8mb download
Upload: 768k

What is TCP analyzer?

trogers · Post by **trogers** » Fri Jan 12, 2007 10:41 pm

DeputySheriff wrote:ISP=Comcast
Download: 8.8mb download
Upload: 768k

What is TCP analyzer?

The link to this analyzer is at the lower left of the main page of our website. Just click on the link and the test will run. When completed, just copy and post your report.

DeputySheriff · Post by **DeputySheriff** » Fri Jan 12, 2007 11:16 pm

« SpeedGuide.net TCP Analyzer Results »
Tested on: 01.12.2007 23:15
IP address: 68.35.xxx.xxx

TCP options string: 020405ac01010101
MSS: 1452
MTU: 1492
TCP Window: 65535 (NOT multiple of MSS)
RWIN Scaling: 0
Unscaled RWIN : 65535
Reccomended RWINs: 63888, 127776, 255552, 511104
BDP limit (200ms): 2621kbps (328KBytes/s)
BDP limit (500ms): 1049kbps (131KBytes/s)
MTU Discovery: ON
TTL: 112
Timestamps: OFF
SACKs: OFF
IP ToS: 00100000 (32)
Precedence: 001 (priority)
Delay: 0 (normal delay)
Throughput: 0 (normal throughput)
Reliability: 0 (normal reliability)
Cost: 0 (normal cost)
Check bit: 0 (correct)
DiffServ: CS1 001000 (8) - class 1 (RFC 2474). Similar forwarding behavior to the ToS Precedence field.

trogers · Post by **trogers** » Fri Jan 12, 2007 11:23 pm

Download the TCP Optimizer from here: http://www.speedguide.net/downloads.php

Use the following with TCP Optimizer:

General Settings tab:
Custom settings - check
Modify All Network Adapters - check
network adapter selection - your NIC
MTU - 1492
TTL - 64
TCP Receive Window - 255552
MTU Discovery - Yes
Black Hole Detect - No
Selective Acks - Yes
Max Duplicate ACKs - 2
TCP 1323 Options:
Windows Scaling - checked
Timestamps - uncheck

Advanced Settings tab:
Max Connections per Server - 10
Max Connections per 1.0 Server - 20
LocalPriority - 1
Host Priority - 1
DNSPriority - 1
NetbtPriority - 1
Lan Browsing speedup - optimized
QoS: NonBestEffortLimit - 0
ToS: DisableUserTOSSetting - 0
ToS: DefaultTOSValue - 80
MaxNegativeCacheTtl - 0
NetFailureCacheTime - 0
NegativeSOACache Time - 0
LAN Request Buffer Size - 32768
Then select "Apply Changes" and reboot to take effect

DeputySheriff · Post by **DeputySheriff** » Sat Jan 13, 2007 11:09 am

And what am I doing with this actually? This is happening to all my computers, not just mine. I have two laptops, my sons computer, my computer and they are all affected. Comcast says they can see spikes in the bandwidth and dropping to almost nothing. They have a crew scheduled to replace the existing rg-11 line now.

trogers · Post by **trogers** » Sat Jan 13, 2007 6:19 pm

DeputySheriff wrote:And what am I doing with this actually? This is happening to all my computers, not just mine. I have two laptops, my sons computer, my computer and they are all affected. Comcast says they can see spikes in the bandwidth and dropping to almost nothing. They have a crew scheduled to replace the existing rg-11 line now.

This is to increase the RWIN (TCP Buffer) in your comp to suit the 8 mbps bandwidth that your ISP is giving you.

You can read further about this here: http://www.speedguide.net/faq_in.php?category=100

DeputySheriff · Post by **DeputySheriff** » Thu Jan 18, 2007 9:37 pm

Ok, heres an update.

I replaced my router, modem, and installed a smartswitch. Comcast has found some levels out of wack on their end and has replaced taps including running and new RG-11 line to my home. The levels are now as follows.

Acquire Downstream Channel 711000000 Hz Locked
Connectivity State Operational Operational
Boot State OK Operational
Security Enabled BPI+

Downstream Channel

Lock Status Operational
Modulation 256QAM
Channel ID 0
Provisioned Rate 8800 kbps
Symbol Rate 5360.537 Ksym/sec
Downstream Power -1.1 dBmV
SNR 37.8 dB

Upstream Channel

Lock Status Operational
Modulation 16QAM
Channel ID 1
Provisioned Rate 768 kbps
Symbol Rate 2560 Ksym/sec
Upstream Power 46.0 dBmV

I also had Embarq install high speed DSL in my home since i get the first 30 days free. When I connect the DSL modem up to my router and it's linked to my switch I get 5mb download constant.

I connect the linksys comcast service up to the same equipment and I get 2mb downloads and yet when I connect to the modem directly I am getting my full 8mb now. What gives. What is going on with the comcast service that is limiting my network equipment from running at their full potential.

Router - WRV554g VPN Router, Hardware Rev. 2
Modem - Linksys Cable modem, Hardware Rev. 4
Switch - Netgear FS726T Smart Switch

DeputySheriff · Post by **DeputySheriff** » Sat Jan 20, 2007 10:18 am

Is there no one that has any ideas on what may be causing these problems? It's not over heating cause it only does it on the comcast connection and not the DSL. Is the linksys cable modem firmware and the WRV54G incompatiable?

trogers · Post by **trogers** » Sat Jan 20, 2007 10:29 am

DeputySheriff wrote:Is there no one that has any ideas on what may be causing these problems? It's not over heating cause it only does it on the comcast connection and not the DSL. Is the linksys cable modem firmware and the WRV54G incompatiable?

My guess is that it is not incompatibility of Linksys but rather you may have not reset the WAN configuration in the router to work with cable system or DSL. Both of these have different systems.

WAN - Dynamic IP Address
Select this option if your ISP provides you an IP address automatically. This option is typically used for Cable services. Please enter the Dynamic IP information accordingly.

WAN - PPPoE/PPPoA
Select this option if your ISP requires you to use a PPPoE connection. This option is typically used for DSL services. Select Dynamic PPPoE to obtain an IP address automatically for your PPPoE connection. Select Static PPPoE to use a static IP address for your PPPoE connection. Please enter the information accordingly.

So you cannot simply plug your router when it was set for DSL, to work with the cable modem. You will have to rerun the setup of the router to suit Cable services.

DeputySheriff · Post by **DeputySheriff** » Sat Jan 20, 2007 10:40 am

I have reset it many times. My DSL is static IP and I hardcode it into the router. With Cable it's DHCP.

Linksys is telling me I have to clone the MAC address of one of my computers to get it to work, since when have we had to do this. I have been on HSI with comcast since introduced in 2001 here and never had a problem.

trogers · Post by **trogers** » Sat Jan 20, 2007 10:58 am

I am not in the US and so cannot comment on the need of cloning MAC. But some cable service providers do practice it and with all the mergers and taking over of ISPs, some systems taken over may still be running on existing practices.

DeputySheriff · Post by **DeputySheriff** » Sat Jan 20, 2007 11:47 am

But why would my router connection slow down connected to my linksys cable modem and not a DSL modem. On DSL it runs at full bandwidth and on cable it runs ate 1.2 - 1.5mb, on DSL I get the full 5.0mb. Cable should be running at 8.8 which is what I use to.

trogers · Post by **trogers** » Sat Jan 20, 2007 12:04 pm

Perhaps you can first setup your router for Cable services using the specifications of your Cable ISP. You can post a new thread at our Router & Internet sharing section to get assistance from members there who are familiar with both your ISP and your router. When you can achieve your speed near to 8 mbps, then try setting up for the DSL line.

comcast20169 · Post by **comcast20169** » Sun Dec 09, 2007 11:29 am

Have comcast tech to come out and check the BER errors on Pre (thats what I had) and then maintenance found it to be Headend issue.. Going on for more than 2 months..

Remember BER errors on pre or post..

Sava700 · Post by **Sava700** » Mon Dec 10, 2007 3:46 pm

comcast20169 wrote:Have comcast tech to come out and check the BER errors on Pre (thats what I had) and then maintenance found it to be Headend issue.. Going on for more than 2 months..

Remember BER errors on pre or post..

this thread is almost a year old..

SG Broadband Community

Comast Trouble(s)

Comast Trouble(s)

check BER on Pre errors and headend