SB5100 constantly losing upstream channel

SB5100 constantly losing upstream channel
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n0xlf @ 27th Oct 07:23PM:
SB5100 constantly losing upstream channel

I posted this on the Comcast direct forums as well, but started seeing posts here that could be related so I wanted to see if anyone else has any problems that may be specific to the 5100 after the D3 upgrades have hit your area...

Here is my message on the direct forums:

Do you guys have something going on in the Castle Rock/Monument area that would be affecting the upstream channel on an SB5100? Both my dad (Monument, CO) and my brother (Castle Rock, CO) (about 40 miles apart) have SB5100s, and both are seeing the same problem. Several times a day, if not more often, the modem loses the upstream channel and has a difficult time finding a new (or the same) one.

Signal levels are -1dBmV downstream and 40 up. My dad's is quite a bit lower on upstream at around 31, down is about the same. SNR on both are 37. Doubt it's level related since they are both seeing this suddenly...

Related logs on my brothers:
Time Priority Code Message
2009-10-26 17:21:19 3-Critical R002.0 No Ranging Response received - T3 time-out
2009-10-26 17:19:59 3-Critical T001.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
2009-10-26 17:19:59 3-Critical T002.0 SYNC Timing Synchronization failure - Failed to acquire FEC framing
2009-10-26 17:19:59 3-Critical T001.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
2009-10-26 17:19:28 3-Critical R002.0 No Ranging Response received - T3 time-out
2009-10-26 17:19:18 3-Critical D001.0 DHCP FAILED - Discover sent, no offer received
2009-10-26 17:16:08 3-Critical R002.0 No Ranging Response received - T3 time-out
2009-10-26 17:15:51 3-Critical D001.0 DHCP FAILED - Discover sent, no offer received
2009-10-26 17:12:29 3-Critical C206.0 DCC aborted unable to communicate on new upstream channel
2009-10-26 17:12:29 3-Critical R003.0 Init RANGING Critical Ranging Request Retries exhausted
2009-10-26 17:12:29 3-Critical R002.0 No Ranging Response received - T3 time-out
2009-10-26 16:51:07 6-Notice E112.0 SW download Successful - Via Config file
2009-10-26 16:50:41 6-Notice E102.0 SW Download INIT - Via Config file d11_m_sb5100_silver_c01.cm
1970-01-01 00:05:11 3-Critical R002.0 No Ranging Response received - T3 time-out
1970-01-01 00:03:52 3-Critical R003.0 Init RANGING Critical Ranging Request Retries exhausted
1970-01-01 00:03:52 3-Critical R002.0 No Ranging Response received - T3 time-out

(lots of T3 timeouts)

Obviously this isn't likely a line tech type of problem since they live so far apart, and had good service until recently....
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nerdburg @ 27th Oct 07:45PM:
Re: SB5100 constantly losing upstream channel

That SB5100 is pretty old....
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Johkal @ 27th Oct 07:48PM:
Re: SB5100 constantly losing upstream channel

said by nerdburg :

That SB5100 is pretty old....

And?
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n0xlf @ 27th Oct 07:51PM:
Re: SB5100 constantly losing upstream channel

They are DOCSIS 2.0 compliant and should work fine (and in fact, were working fine until recently)...
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EG @ 27th Oct 08:06PM:
Re: SB5100 constantly losing upstream channel

said by nerdburg :

That SB5100 is pretty old....

I.M.H.O., the SB5100 was one of the best modems ever made ! Always was and still is bulletproof even though it may not be up to today's standards.
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tshirt @ 27th Oct 09:03PM:
Re: SB5100 constantly losing upstream channel

Nothing wrong with a 5100, and 40 miles apart (could be different CMTS, and maybe different causes) having the same problem, MIGHT or MIGHT NOT be related.
Your dad's upstream might be a little low (depends on his other numbers) and the T3's on your brothers log might indicate upstream SNR problems..But if D3 just hit your area you might want to give them a week, or call now and let them know.
After D3 hit here ,there were some rough days while the rebalanced various channels, but wuthin a few days everything was at least as good as before, and now is rock solid.
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n0xlf @ 27th Oct 10:44PM:
Re: SB5100 constantly losing upstream channel

It's a different CMTS, as far as I know. Just strange that the timing for this issue was identical for both. It's been going on for a few weeks...
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EG @ 27th Oct 11:03PM:
Re: SB5100 constantly losing upstream channel

said by n0xlf :

It's a different CMTS, as far as I know.

Maybe it's just a different port on the same CMTS ?

Would you happen to know if it is the same headend for both of you ?
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Anonymous_ @ 28th Oct 12:16AM:
Re: SB5100 constantly losing upstream channel

said by EG :

said by nerdburg :

That SB5100 is pretty old....

I.M.H.O., the SB5100 was one of the best modems ever made ! Always was and still is bulletproof even though it may not be up to today's standards.

Maybe it's bulletproof because there is too many holes :p

Motorola,Sony and DLink have the worst firmware ever

they are the top 3 with shitty firmware

netgear makes #4 on the list
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Dustyn @ 28th Oct 02:34AM:
Re: SB5100 constantly losing upstream channel

said by Anonymous_ :

said by EG :

said by nerdburg :

That SB5100 is pretty old....

I.M.H.O., the SB5100 was one of the best modems ever made ! Always was and still is bulletproof even though it may not be up to today's standards.

Maybe it's bulletproof because there is too many holes :p

Motorola,Sony and DLink have the worst firmware ever

they are the top 3 with shitty firmware

netgear makes #4 on the list

...plus Linksys. ;)
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EG @ 28th Oct 09:40AM:
Re: SB5100 constantly losing upstream channel

said by Anonymous_ :

said by EG :

said by nerdburg :

That SB5100 is pretty old....

I.M.H.O., the SB5100 was one of the best modems ever made ! Always was and still is bulletproof even though it may not be up to today's standards.

Maybe it's bulletproof because there is too many holes :p

Motorola,Sony and DLink have the worst firmware ever

they are the top 3 with shitty firmware

netgear makes #4 on the list

Is that just your opinion or can either of you back up your comments with some empirical evidence ?
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nerdburg @ 28th Oct 09:51AM:
Re: SB5100 constantly losing upstream channel

said by Johkal :

said by nerdburg :

That SB5100 is pretty old....

And?

If you have a modem that came with Windows ME drivers..it's time to think about replacing it.
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[Insert Comcast employee disclaimer here.]
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COMMAN @ 28th Oct 10:08AM:
Re: SB5100 constantly losing upstream channel

Perhaps you could share your thoughts on the Modem with the BEST firmware ever? Maybe your favorite Top 5?
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n0xlf @ 28th Oct 01:17PM:
Re: SB5100 constantly losing upstream channel

I love what these threads turn into... :)

Modems are (somewhat) dumb devices...Pretty much a programmable DSP. As such, age doesn't make them "go bad", and DOCSIS 2.0 compatibility is DOCSIS 2.0 compatibility. If it couldn't meet the standard, it wouldn't be certified for use in that capacity.

Trust me, I'm all about the latest and greatest (I had a SB6120 the day they rolled out D3 here), but for those that don't really care (my dad and brother in this case), there is no reason why their 5100s shouldn't work just fine. They get the PB speeds just fine as well...

This thread sounds very Comcastic so far - Rather than fix the actual problem, just replace the modem...(which, ironically, would likely solve the problem, but that's not the point)....
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EG @ 28th Oct 01:28PM:
Re: SB5100 constantly losing upstream channel

I had my 5100 until 1 month ago when I electively changed it for an SB6120 so that I could upgrade to the Ultra service and take advantage of the benefits of channel bonding on my segment. My point is that I was getting Powerboost bursts up to 34 Mbps on the down and 4.3 Mbps on the up with it !! The 5100 was six years old.. I was on the Blast 16/2 tier at the time. Not too shabby I would say.
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n0xlf @ 28th Oct 06:07PM:
Re: SB5100 constantly losing upstream channel

This could be related, as the OP shows the same ranging errors that I'm seeing:

»Longmont Colorado HSI Cable Modem Issues: Locks and Drops

It's possible that the new SB5100 firmware that recently got rolled out is causing all of this...
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Johkal @ 28th Oct 06:09PM:
Re: SB5100 constantly losing upstream channel

Too bad Dadkins isn't here to set you straight on the SB5100.

Any way, the only reason to replace a working SB5100, would be if a customer was subscribing to a D3 tier.

Age means nothing if the modem is D2 capable and is supported by an ISP.
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Write me up a 125.......I Can't Drive 55 »redrocker.com/ »cabowabo.com/
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n0xlf @ 3rd Nov 01:47AM:
Re: SB5100 constantly losing upstream channel

As expected, this was a CMTS issue and has been fixed!

Countless SB5100s in my area have probably just been saved from the landfills... :)
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EG @ 3rd Nov 09:27AM:
Re: SB5100 constantly losing upstream channel

said by n0xlf :

As expected, this was a CMTS issue and has been fixed!

I'm curious as to exactly what happened. Can you elaborate and/or post some documentation ?
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Quaoar @ 3rd Nov 10:00AM:
Re: SB5100 constantly losing upstream channel

Same type of system problems in Fort Collins, perhaps related to release of D3.
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