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StevenB
Premium Member
join:2000-10-27
New York, NY
·Charter

StevenB

Premium Member

[TWC] Have a question on Modem Logs

My power went out for about a day, something blew on my block. Power Restored and my modem logs are now showing this. My internet is fine to connect, but when I was playing a game with my son online, we noticed a pause, then it would try and catch up.

Called up Time Warner, they said my singls are fine, and my logs are just typical modem log entries. I feel something is awry, any of you nice people care to tell me if i should press the issue or just stop over-reacting?
thanks

1/31/2008 15:21 17000100 3 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
1/31/2008 15:32 17000400 3 SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
1/31/2008 15:32 17000100 3 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
1/31/2008 15:32 17000400 3 SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
1/31/2008 15:32 17000100 3 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
1/31/2008 15:32 17000400 3 SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
1/31/2008 15:32 17000100 3 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
1/31/2008 15:32 17000400 3 SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
1/31/2008 15:32 17000100 3 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
1/31/2008 15:32 17000400 3 SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
1/31/2008 15:32 17000100 3 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
1/31/2008 15:32 17000400 3 SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
***** 20000200 3 No Ranging Response received - T3 time-out
1/31/2008 16:17 1040100 6 TLV-11 - unrecognized OID
1/31/2008 19:00 20000400 3 Received Response to Broadcast Maintenance Request, but no Unicast Maintenance opportunities received - T4 timeout
1/31/2008 19:00 17000100 3 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
1/31/2008 19:01 1040100 6 TLV-11 - unrecognized OID
2/1/2008 8:24 20000200 3 No Ranging Response received - T3 time-out
-----------------------------------

Downstream
Freq/Power: 687.000 MHz 5 dBmV
Signal to Noise Ratio: 38 dB
Modulation: QAM256

--------------------------------------------------------------------------------
Upstream
Freq/Power: 38.496 MHz 41 dBmV
Channel Type: DOCSIS 1.x (TDMA)

Symbol Rate: 2560 kSym/sec

Modulation: QAM16
------------------------------
daveinpoway
Premium Member
join:2006-07-03
Poway, CA

daveinpoway

Premium Member

Sorry, I can't help with interpreting the modem logs, but I can tell you that your signal levels are all OK.
Mele20
Premium Member
join:2001-06-05
Hilo, HI

Mele20 to StevenB

Premium Member

to StevenB
%UBR900-4-FAILED_TO_ACQUIRE_SYNC: T01.0 Failed to acquire QAM/QPSK symbol timing. Error stats? Retry [dec]'s

Explanation The cable modem could not lock on to the downstream's QAM/QPSK SYNC signal This error message is DOCSIS event message T01.0, SYNC Timing Synchronization failure.

Recommended Action Check the RF plant for cabling and connector problems that could be generating noise on the downstream. If using a Cisco CMTS, you can use the show cable flap-list command to determine if other cable modems on the upstream are having problems. You can also use the show interfaces cable upstream command and examine the noise, microreflection, and uncorrectable error counters to determine the level of noise on the upstream.

%UBR900-4-FAILED_TO_RECEIVE_SYNC: T04.0 Failed to Receive MAC SYNC frame within time-out period

Explanation The cable modem initially was able to acquire MAC framing but failed to receive the MAC SYNC frame within the timeout period. This error message is DOCSIS event message is T04.0, SYNC Timing Synchronization failure.

Recommended Action Check the RF plant for cabling and connector problems that could be generating noise on the downstream. If using a Cisco CMTS, you can use the show cable flap-list command to determine if other cable modems on the upstream are having problems. You can also use the show interfaces cable upstream command and examine the noise, microreflection, and uncorrectable error counters to determine the level of noise on the upstream.

Some modems (Motorola Surfboards especially) record every little thing in the log and users panic. I see the first one and T3 and T4 time out frequently and my connection is fine. What you need to do is watch your connection for awhile and if still seems to be lagging then you need to talk to tier 3 and ask the tech to run the show cable flap list command if they haven't already done it which they may have and haven't told you because 95% of the users would be mystified by this. This will show them if other modems near you are also having problems. If it looks that way, a good, experienced tech will probably then ping some of those modems, while they still have you on the phone, and if they see a problem then they will roll a truck as soon as possible. Some techs don't know to do this or just won't. I've had to call more than once, even to tier 3, and ask for one of the old timers by name. Several times, when the tech looked at the flap list and pinged other modems in the area sure enough just as I had said there was a problem that they were unaware of in my area until I reported it. A couple of other times though (this is over an almost 7 year period now), a tier 3 tech looked at the flap list without my even asking them to and told me everything was great and that my stats were so perfect that it was "scary".

Your modem stats look fine so I would do nothing and watch it for awhile.

Here's the link to the Cisco cable modem/UBR error messages:
»www.cisco.com/univercd/c ··· errs.htm

StevenB
Premium Member
join:2000-10-27
New York, NY
·Charter

StevenB

Premium Member

thanks alot you 2

my connection is fine, sometimes in games it will slow up then i'll see it trying to catch itself back up. but updating my network card driver fixed that issue.

this modem is a arris one, the phone/hsi built in. give it a few days and i'll call.

thanks again!