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casnev

join:2012-03-08
Henderson, NV

[NV] new modem - still having frequent disconnects

I had been having frequent disconnect with an older Motorola modem. After a friend upgraded to a new DOCIS 3.0 modem and noticed significant improvement in his connection, I decided to do the same. A trip to frys and I have a new SB6121 Motorola. It has improved the connection *some* but it is still dropping frequently.

My signals:

Downstream Bonding Channel Value
Channel ID 47 45 46 48
Frequency 855000000 Hz 843000000 Hz 849000000 Hz 861000000 Hz
Signal to Noise Ratio 36 dB 36 dB 36 dB 35 dB
Downstream Modulation QAM256 QAM256 QAM256 QAM256
Power Level
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
5 dBmV 6 dBmV 6 dBmV 1 dBmV

Upstream:

Upstream Bonding Channel Value
Channel ID 5
Frequency 37400000 Hz
Ranging Service ID 8208
Symbol Rate 2.560 Msym/sec
Power Level 48 dBmV
Upstream Modulation [3] QPSK
[3] 16QAM

Ranging Status Success

sample log.....this is happening a few times per day (MAC removed):

Mar 08 2012 05:01:49 6-Notice I401.0 TLV-11 - unrecognized OID;CM-;CMTS-;CM-QOS=1.1;CM-VER=3.0;

Mar 08 2012 05:01:42 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-;CMTS-;CM-QOS=1.1;CM-VER=3.0;

Mar 08 2012 05:01:19 6-Notice I401.0 TLV-11 - unrecognized OID;CM-;CMTS-;CM-QOS=1.1;CM-VER=3.0;

Jan 01 1970 00:00:14 6-Notice Cable Modem Reboot due to partial service ;CM-;CMTS-;CM-QOS=1.1;CM-VER=3.0;

Mar 08 2012 05:00:37 6-Notice MDD Recovery following MDD Loss;CM-;CMTS-;CM-QOS=1.1;CM-VER=3.0;

Mar 08 2012 05:00:37 5-Warning T202.0 Lost MDD Timeout;CM-;CMTS-;CM-QOS=1.1;CM-VER=3.0;

Mar 08 2012 05:00:37 5-Warning DS Partial Service Fallback: MDD Lost-> CM in DOCSIS 2.0 Recovery Mode ;CM-;CMTS-;CM-QOS=1.1;CM-VER=3.0;

Mar 07 2012 19:16:04 6-Notice I401.0 TLV-11 - unrecognized OID;CM-;CMTS-;CM-QOS=1.1;CM-VER=3.0;

Jan 01 1970 00:00:14 6-Notice Cable Modem Reboot due to partial service ;CM-;CMTS-;CM-QOS=1.1;CM-VER=3.0;

Mar 07 2012 19:15:25 5-Warning T202.0 Lost MDD Timeout;CM-;CMTS-;CM-QOS=1.1;CM-VER=3.0;

Mar 07 2012 19:15:25 5-Warning DS Partial Service Fallback: MDD Lost-> CM in DOCSIS 2.0 Recovery Mode ;CM-MAC=a4:7a:a4:ee:a0:62;CMTS-;CM-QOS=1.1;CM-VER=3.0;

I have talked with support before with the old modem and "everything looks good" was the response. Any suggestions of how to get it stable?

Thank you,

Chris


m8trix

join:2003-12-24
Phoenix, AZ
kudos:4

what firmware version do you have


casnev

join:2012-03-08
Henderson, NV

Looks like:

Model Name: SB6121
Vendor Name: Motorola
Firmware Name: SB612X-1.0.5.1-SCM00-NOSH
Boot Version: PSPU-Boot(25CLK) 1.0.12.
Hardware Version: 5.0

Firmware Build Time: Dec 21 2010 15:52:06



dvd536
as Mr. Pink as they come
Premium
join:2001-04-27
Phoenix, AZ
kudos:4
reply to m8trix

said by m8trix:

what firmware version do you have

So much for the arguement that 1.0.5.1 fixed that issue.


dvd536
as Mr. Pink as they come
Premium
join:2001-04-27
Phoenix, AZ
kudos:4
reply to casnev

I'm just betting your issues would go away with a cisco DPC3010 modem.


m8trix

join:2003-12-24
Phoenix, AZ
kudos:4
Reviews:
·Cox HSI
reply to dvd536

i love how you think because some one has a moto modem its instantly a modem issue and the cisco will cure all that is just being naive, the fact is since the firmware update this past june they are no more prone to issue then cisco modem but one of the first thing you want to check along with the signal is the firmware for the moto's as the older firmware's were causing issues

just looking at the first page of topics and eliminating people who posted multiple times there are just about as many people having connections issue with the cisco, but keep in mind that since motos are sold retail and are bought by more people its only natural that you may see more topics but i can tell you first hand im on a 6120 and had connection issue prior to the update but since not one problem

Ill im trying to tell you is have a open mind, if signal levels are fine and firmware is up to date and tech visit have not solved the issue then maybe that person should try a new modem or cisco but it seem you prefer to shoot first and ask question later approach

and being he said he had a older modem before and was having issue its more likely a signal or noise issue some where


daveinpoway
Premium
join:2006-07-03
Poway, CA
kudos:2

It is my understanding that the signal levels of the bonded downstream channels need to be within 2 dB of each other; the 4th channel (1 dBmv) is somewhat lower than the other three (5 or 6 dBmv). This will probably require a tech visit to correct.



CoxVegas

join:2011-07-25
Las Vegas, NV
kudos:10
reply to casnev

casenv,

Send me your modem MAC in a PM and I'll take a closer look.



CoxVegas

join:2011-07-25
Las Vegas, NV
kudos:10

1 edit
reply to casnev

As daveinpoway stated, your highest channel is too far off from the others, and it's your highest frequency channel. Do you have any old splitters or the like between the modem and the wall? (Old splitters were only "good" up to 860Mhz (or less, depending on if its REALLY ancient :/))


casnev

join:2012-03-08
Henderson, NV

I will go buy a new one and try that out....any recommended type to put on the main line in?

Thank you for the help!


m8trix

join:2003-12-24
Phoenix, AZ
kudos:4
Reviews:
·Cox HSI
reply to casnev

if your going to get new splitter get one that is rated 5Mhz-1000Mhz(1Ghz) and look for a number on the out put legs there should be a number either 3.5db or 7 db you want the 3.5db variety

similar to this one

»www.cableandwireshop.com/regal_1···ter.html



dvd536
as Mr. Pink as they come
Premium
join:2001-04-27
Phoenix, AZ
kudos:4
reply to casnev

said by casnev:

I will go buy a new one and try that out....any recommended type to put on the main line in?

Go to your cox walkin and ask for one or if a tech is coming out, get one from him/her.

those wal*mart, best buy, radio shack splitters are garbage.
make sure you don't have any unused legs on your splitter(s), that could let noise in.

daveinpoway
Premium
join:2006-07-03
Poway, CA
kudos:2

The solution to unused splitter ports is to install a terminator (such as: »www.smarthome.com/7808/75-Ohm-Te···k/p.aspx ) on each one. These can be found locally at Home Depot and other places; I'm not sure if the Cox stores also have them.


casnev

join:2012-03-08
Henderson, NV

I haven't had a chance to go track down a new splitter, but I took a look at the one that is in place right now. It is one of those red ones that cox tech's install (1ghz with 3.5 outputs). I decided to switch the TV output with the one the modem was hooked up to. So far the modem levels seem better, and I have had no reboots in a day (which is much longer than in the past) My levels now:

Downstream Bonding Channel Value
Channel ID 47 43 44 48
Frequency 855000000 Hz 831000000 Hz 837000000 Hz 861000000 Hz
Signal to Noise Ratio 36 dB 35 dB 35 dB 36 dB
Downstream Modulation QAM256 QAM256 QAM256 QAM256
Power Level
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
5 dBmV 3 dBmV 3 dBmV 4 dBmV

I am going to replace the splitter even though that change doesn't appear to have impacted HD tv quality. I'm guessing maybe the splitter is going bad....or?



CoxVegas

join:2011-07-25
Las Vegas, NV
kudos:10

You look a fair bit better now (your biggest swing is 2.8dBmV which is still a little much but a lot better than the 5.something you had before, and it's not your highest channel any more). Definitely replace that splitter.