Basic Internet Connectivity And Modem Help

[wboffthelake]

I have recently been experiencing intermittant internet connectivity issues.  When I lose the connection, the "cable" light on my D link DCM-202 changes from green to orange.  It happens several times a day,  sometimes several times an hour, and lasts for about 30-60 seconds.  Any help you can give is appreciated.  I am running Win 7 Pro 64-bit and also use a Linksys WRT54G V8 router between the modem and the computer, all connected via ethernet.

I have included the following from the configuration page.

Thanks.

System Event Log Index Date/Time ID Level Text

90 04/01/12 18:16:51R05.0criticalStarted Unicast Maintenance Ranging - No Response received - T3 time-out

91 04/01/12 18:16:52R06.0criticalUnicast Maintenance Ranging attempted - No response - Retries exhausted

92 04/01/12 18:16:52U02.0criticalUCD invalid or channel unusable

93 04/01/12 18:16:52C206.0criticalDCC aborted unable to communicate on upstream channel

94 04/01/12 18:26:36R05.0criticalStarted Unicast Maintenance Ranging - No Response received - T3 time-out

95 04/01/12 18:27:06R04.0criticalReceived Response to Broadcast Maintenance Request, but no Unicast Maintenance opportunities received - T4 timeout

96 04/01/12 18:27:07U02.0criticalUCD invalid or channel unusable

97 04/01/12 18:27:07C206.0criticalDCC aborted unable to communicate on upstream channel

98 04/01/12 18:31:56R05.0criticalStarted Unicast Maintenance Ranging - No Response received - T3 time-out

99 04/01/12 18:31:58R06.0criticalUnicast Maintenance Ranging attempted - No response - Retries exhausted

100 04/01/12 18:31:58U02.0criticalUCD invalid or channel unusable

101 04/01/12 18:31:58C206.0criticalDCC aborted unable to communicate on upstream channel

102 04/01/12 18:36:59R05.0criticalStarted Unicast Maintenance Ranging - No Response received - T3 time-out

103 04/01/12 18:37:00R06.0criticalUnicast Maintenance Ranging attempted - No response - Retries exhausted

104 04/01/12 18:37:00U02.0criticalUCD invalid or channel unusable

105 04/01/12 18:37:00C206.0criticalDCC aborted unable to communicate on upstream channel

106 04/01/12 18:42:01R05.0criticalStarted Unicast Maintenance Ranging - No Response received - T3 time-out

107 04/01/12 18:42:02R06.0criticalUnicast Maintenance Ranging attempted - No response - Retries exhausted

108 04/01/12 18:42:02U02.0criticalUCD invalid or channel unusable10904/01/12 18:42:02C206.0criticalDCC aborted unable to communicate on upstream channel

Downstream Signal Default Downstream Frequency: Hz Frequency:651000000 Hz

QAM Mode:256

QAMChannel Power:4.3 dBmV

SNR:33.938 dB

Upstream Signal Channel Id:6Frequency:24200000 Hz

Channel Width:3200000 Hz

Channel Power:45.8 dBmV

DOCSIS1.1 Quality of Service Parameters DirectionUpstreamDownstreamSFID0x229f0x22a0SID0x19a5N/ATraffic Priority11

Max Sustained Traffic Rate (bps)220000016500000

Max Transmit Burst (bytes)500000010000000

Min Reserved Traffic Rate (bps)00

Service Flow Scheduling TypeBest EffortN/A

Cable Status Initialize Hardware Success

Find DownstreamSuccess

RangingSuccessDHCP BoundSuccess

Set Time-of-DaySuccess

Download CM Config FileSuccess

RegistrationSuccess

Traffic Enable!

General Information Model Name: DCM-202

Hardware Version: 1A

Software Version: 2.00.03D1.07

System Time: SUN APR 01 19:05:01 2012

System Up Time: 05h:39m:37s

Standard Specification Compliant: DOCSIS 1.1/2.0 Cable Modem IP Information

[i-am-nerdburg]

You'll want to replace the modem. I'd suggest you check out a Motorola 6121 or Zoom 5341-J either one is about $75. When you get your new modem, just hook it up and call Comcast, they will activate it for you.

[g7yXEj]

i have 3 dos windows continuously pinging my DCM-202. So far it hasn't gone down while I'm ping flooding it.

ping -t 192.168.100.1

[EG]

That ping is on the LAN (local) end. FWIW, that modem has a long history of being problematic on the Comcast network WAN (remote) end.

[g7yXEj]

Yes, i understand where the ping is coming from but it's working, or at least seems to be. I can now listen to NBA audio league pass without interruption.

[EG]

To be more clear, it is the way that that modem/firmware load reacts with the CC system (certain brands of their CMTS's) that has historically been an issue. I was trying to indicate that a local ping may not prove/reveal anything in this case.. Good luck with it.

[wboffthelake]

Thanks for your help.  I am looking into a new modem, and, since I will be going DOCSIS 3.0, a new router as well, as I currently have a Linksys WRT54G v8 that I understand will limit speed.  Do you have any manufacturer/model suggestions for that as well?

[wboffthelake]

I now have a Zoom 5341J, and a Linksys EA3500 (which I have yet to connect). How do my numbers look now? Startup Procedure Procedure Status Comment

Acquire Downstream Channel	693000000 Hz	Locked
Connectivity State	OK	Operational
Boot State	OK	Operational
Configuration File	OK
Security	Enabled	BPI+

Downstream Bonded Channels Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables

1	Locked	QAM256	8	693000000 Hz	4.5 dBmV	40.7 dBmV	0	0
2	Locked	QAM256	1	651000000 Hz	3.7 dBmV	40.8 dBmV	0	0
3	Locked	QAM256	2	657000000 Hz	3.7 dBmV	40.8 dBmV	0	0
4	Locked	QAM256	3	663000000 Hz	4.0 dBmV	40.8 dBmV	0	0
5	Locked	QAM256	4	669000000 Hz	5.1 dBmV	41.1 dBmV	0	0
6	Locked	QAM256	5	675000000 Hz	4.0 dBmV	41.0 dBmV	0	0
7	Locked	QAM256	6	681000000 Hz	4.9 dBmV	41.5 dBmV	0	0
8	Locked	QAM256	7	687000000 Hz	5.5 dBmV	41.5 dBmV	0	0

Total Correctables Total Uncorrectables

0	0

Upstream Bonded Channels Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power

1	Locked	ATDMA	5	5120 Ksym/sec	29500000 Hz	49.5 dBmV
2	Locked	ATDMA	4	5120 Ksym/sec	36400000 Hz	49.5 dBmV
3	Locked	TDMA and ATDMA	6	2560 Ksym/sec	24200000 Hz	49.5 dBmV
4	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0.0 dBmV

[EG]

The upstream power is borderline high but may be o/k as long as it remains fairly stable.