New Contributor
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2 Messages
T3 and T4 time out issues
My service seems to be working fine, however the modem itself is providing several indications that things are not fully functional. Can someone tell me what is likely occurring here?
Here are modem details:
Model Name: SB6121
Vendor Name: Motorola
Firmware Name: SB_KOMODO-1.0.6.14-SCM01-NOSH
Boot Version: PSPU-Boot(25CLK) 1.0.12.18m3
Hardware Version: 5.0
Firmware Build Time: Mar 6 2014 15:23:55
I see the following entries in the modem logs:
| Time | Priority | Code | Message |
|---|---|---|---|
| Jan 10 2015 22:06:46 | 3-Critical | R05.0 | Started Unicast Maintenance Ranging - No Response received - T3 time-out; |
| Jan 10 2015 22:06:16 | 3-Critical | R04.0 | Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out; |
The status page also suggests that the modem is offline:
| Task | Status |
|---|---|
| DOCSIS Downstream Channel Acquisition | Not started |
| DOCSIS Ranging | Not started |
| Establish IP Connectivity using DHCP | Not started |
| Establish Time Of Day | Not started |
| Transfer Operational Parameters through TFTP | Not started |
| Register Connection | Not started |
| Cable Modem Status | Offline |
| Initialize Baseline Privacy | Done |
The "signal" page suggests that I'm having some kind of issue with upstream on channel 2 (see the upstream ranging status row):
| Downstream | Bonding Channel Value | ||||
|---|---|---|---|---|---|
| Channel ID | 97 | 98 | 99 | 100 | |
| Frequency | 795000000 Hz | 801000000 Hz | 807000000 Hz | 813000000 Hz | |
| Signal to Noise Ratio | 38 dB | 37 dB | 37 dB | 37 dB | |
| Downstream Modulation | QAM256 | QAM256 | QAM256 | QAM256 | |
Power Level
|
10 dBmV | 9 dBmV | 9 dBmV | 8 dBmV | |
| Upstream | Bonding Channel Value | |||
|---|---|---|---|---|
| Channel ID | 1 | 2 | 3 | 4 |
| Frequency | 21600000 Hz | 26500000 Hz | 33000000 Hz | 37900000 Hz |
| Ranging Service ID | 171 | 171 | 171 | 171 |
| Symbol Rate | 2.560 Msym/sec | 5.120 Msym/sec | 5.120 Msym/sec | 2.560 Msym/sec |
| Power Level | 41 dBmV | 41 dBmV | 41 dBmV | 41 dBmV |
| Upstream Modulation | [3] 16QAM [3] 64QAM |
16QAM |
[3] 16QAM [3] 64QAM |
[3] 16QAM [3] 64QAM |
| Ranging Status | Success | Retries Exceed | Success |
Success |
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Diskrete
New Contributor
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11 Messages
Your frequency on the channel ID's is extremely high, but they will most likely tell you your equipment is faulty and "everything is good on our end". Con you into a new gateway rental and swap your box out once a month when your box decides to stop working when in reality you have a line issue. Good luck, I'm on month 7 with no resolution and a new gateway I purchased. Gooo COX for the upsell!
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Allan
Moderator
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2.3K Messages
Hello Perky,
The signal levels that your modem is reporting is very poor. Are you currently using a splitter on the cable line going to that modem? Also, do you have any amplifiers running to this cable line?
Allan - Cox Support Forums Moderator
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Perky
New Contributor
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2 Messages
There is a splitter where the coax comes into the house and there is a splitter behind the entertainment center. Both are splitters that were provided by cox support staff during an onsite visit. I say that because they explained that many of the splitters provided by popular retailers are of lesser quality than those used by Cox support staff. I just double checked the splitter behind the entertainment center to make sure all of the connections are tight. I imagine that everyone will start to ask me to bypass the splitter(s) and see if things are better. Since I currently have connectivity and decent bandwidth, I don't plan to tackle such a bypass because my entertainment center has to be emptied and moved in order to do so. When you say "signal levels that your modem is reporting is very poor", can you please explain which fields you're talking about and what the acceptable/expected range of values would be? I do not have any amplifiers.
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ChrisL
Former Moderator
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7.1K Messages
-10 to +10 is considered acceptable for the receive levels although the closer to 0 you can get the better. 35 to 50 would be considered normal for the upstream signals.
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