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EG
The wings of love
Premium
join:2006-11-18
Union, NJ
kudos:10
reply to flwpwr

Re: Post-Sandy Modem or Comcast Problem??

said by flwpwr :

But I digress, why try to help.

Is that a rhetorical question ??


Mike Wolf

join:2009-05-24
Beachwood, NJ
kudos:4
reply to dmk08809
I only hope that this time around Comcast will actually put in quality top of the line brand new equipment instead of the cheap stuff they got from the lowest bidder. 802.11n 450Mbps Wi-Fi hotspots hopefully.


beachintech
There's sand in my tool bag
Premium
join:2008-01-06
kudos:5
They will until they get to your neighborhood, then its back to the used stuff they bough from Mediacom.
--
Ex-Tech at the Beach.
I speak for myself, not my former employer.


Mike Wolf

join:2009-05-24
Beachwood, NJ
kudos:4
damn it. my neighborhood in particular? We're not having any issues now that I'm finally home except that the IPv6 DHCP lease time is only 60 minutes instead of the 4 days I normally get.

robhouston

join:2001-09-15
Chester, NJ
reply to robhouston
So, the problems started again a few days ago. Every so often, the modem will reboot by itself or lock up, requiring a reboot.

The error in the modem log is "Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-"

Signals are Downstream - SNR 36dB, Power Level -6dBmV; Upstream - Power Level - 49dBmV. So, I think these are good.

I've swapped out the modem with a new one, and I'm continuing to have these issues, so I think that rules out the modem as the problem.

Any ideas about what is causing this?

Thanks!


beachintech
There's sand in my tool bag
Premium
join:2008-01-06
kudos:5
Without being there with a meter, not really. Call for a service visit.
--
Ex-Tech at the Beach.
I speak for myself, not my former employer.

robhouston

join:2001-09-15
Chester, NJ
Thanks, but the problem is intermittent, meaning that it's likely nothing will happen for the short time a tech is here.

That said, if this continues, I'll have no choice but to call for a tech.


dmk08809

join:2001-09-08
Clinton, NJ
Reviews:
·CenturyLink
·Vonage
·Comcast
Yeah Rob, I'd bet our problems are unrelated . . . but . . . After being stable for nearly a week its starting to come off the rails here again too. Am now seeing periodic bursts of ranging errors - end result is excessive latency, jitter, and packet loss. The problem here existed before Sandy intermittently, eventually the storm hit & service was down for a ~week+, then things slowly improved.

I've already had 2 tech dispatches before & after the storm. Each time they've promised its been fixed after doing something somewhere (they wouldn't reveal what). I tried engaging ComcastSteve but I think he gave up after several unsuccessful volleys back-and-forth. I really don't know what else to do at this point but suppose will try yet another dispatch or maybe seek out the mythical Comcast executive support group to see if they can do anything. I don't wanna drop the service and go back to DSL, but at least that worked reliably (even if a tad slower)!

Its really amazing at just how fragile this technology is for a 3rd generation product; or perhaps maybe how poorly its implemented here resulting in all these chronic problems. At least I know its not just my service -- the neighbors also complain but have been (beaten?) into being complacency and accept the lousy service even for choppy & broken up CDV voice services!

*sigh*


beachintech
There's sand in my tool bag
Premium
join:2008-01-06
kudos:5
reply to robhouston
You'd be surprised what a good tech can see with their meter. Call in for service, and keep calling until it's resolved.
--
Ex-Tech at the Beach.
I speak for myself, not my former employer.


Zeo

@comcast.net
I too was having high latency and jitter since around the time of Sandy and have been troubleshooting this since. I also like you replaced my modem. I was using a Moto 6120 and bought a new Moto 6121 and had the same exact problems. The 4 visit from techs he tried a Ubee modem from them and it has been working good. I think there is something going on with Moto modems on Comcasts end. What brand are you using?


EG
The wings of love
Premium
join:2006-11-18
Union, NJ
kudos:10
reply to robhouston
said by robhouston:

Signals are Downstream - SNR 36dB, Power Level -6dBmV; Upstream - Power Level - 49dBmV. So, I think these are good.

For curiosity, have you ever noticed the upstream power level intermittently fluctuating higher to 51 dB or above ?

robhouston

join:2001-09-15
Chester, NJ
reply to Zeo
Yes, indeed, using both the SB6120 and SB6121 modems. Same problem with both.

robhouston

join:2001-09-15
Chester, NJ
reply to EG
Yes, I have. The upstream power level is often 50-51 dB, but it doesn't seem to go above that.


EG
The wings of love
Premium
join:2006-11-18
Union, NJ
kudos:10
said by robhouston:

Yes, I have. The upstream power level is often 50-51 dB, but it doesn't seem to go above that.

In an effort to try to obtain a bit more wiggle room to allow for signal fluxes, are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured ?

If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two way splitter connected directly off of the drop from the street/pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then putting them back together again, then perhaps it's best to book a tech visit to investigate and correct.

robhouston

join:2001-09-15
Chester, NJ
There is only one 2-way splitter between the street and the modem----one side directly to the modem, the other to the TV's. I'll check the connection integrity again, but I don't think that is the problem.

Thanks for the suggestion, though, and yes, if I either can't figure it out or it doesn't stop, I'll need to call for a tech.

Thanks again!

robhouston

join:2001-09-15
Chester, NJ
reply to EG
There is only one 2-way splitter between the street and the modem----one side directly to the modem, the other to the TV's. I'll check the connection integrity again, but I don't think that is the problem.

Thanks for the suggestion, though, and yes, if I either can't figure it out or it doesn't stop, I'll need to call for a tech.

Thanks again!


EG
The wings of love
Premium
join:2006-11-18
Union, NJ
kudos:10
reply to robhouston
Good luck with it !


sortofageek
Runs from Clowns
Premium,Mod
join:2001-08-19
kudos:23
reply to robhouston

(topic move) New firmware for Motorola modems?

Moderator Action
The post that was here, has been moved to a new topic .. »New firmware for Motorola modems?