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Consistent Lost MDD Timeout and RCS Partial Service Errors
I moved into a new apartment (Denver, CO) on 8/1 and have been dealing with general connectivity issues since returning from a trip on 8/14. As soon as I powered up my modem and router, I noticed that the modem would reset the connection every 15 or so minutes. It was a fairly old modem (SB6141), and not technically supported by Xfinity, so I decided to start with purchasing a new one.
After purchasing and connecting a new modem (SB6910), I'm still experiencing issues, although not as severe. While the modem never appears to lose the connection entirely (doesn't go through a reset cycle), my network speeds are wildly inconsistent (anywhere from 80 Mbps down to 400+) and the modem logs report issues nearly every minute. I finally was able to arrange an onsite tech appointment after multiple support calls but wanted to share my logs and other details in the meantime in case anyone has feedback.
| Startup Procedure | ||
|---|---|---|
| Procedure | Status | Comment |
| Acquire Downstream Channel | Locked | |
| Connectivity State | OK | Operational |
| Boot State | OK | Operational |
| Configuration File | OK | |
| Security | Enabled | BPI+ |
| DOCSIS Network Access Enabled | Allowed | |
| Downstream Bonded Channels | ||||||||
|---|---|---|---|---|---|---|---|---|
| Channel | Lock Status | Modulation | Channel ID | Frequency | Power | SNR | Corrected | Uncorrectables |
| 1 | Locked | 256QAM | 4 | 573.00 MHz | 1.60 dBmV | 43.38 dB | 5 | 0 |
| 2 | Locked | 256QAM | 1 | 555.00 MHz | 1.90 dBmV | 43.38 dB | 11 | 0 |
| 3 | Locked | 256QAM | 2 | 561.00 MHz | 1.90 dBmV | 44.63 dB | 0 | 0 |
| 4 | Locked | 256QAM | 3 | 567.00 MHz | 1.60 dBmV | 43.38 dB | 0 | 0 |
| 5 | Locked | 256QAM | 5 | 579.00 MHz | 1.80 dBmV | 43.38 dB | 8 | 0 |
| 6 | Locked | 256QAM | 6 | 585.00 MHz | 2.00 dBmV | 43.38 dB | 0 | 0 |
| 7 | Locked | 256QAM | 7 | 591.00 MHz | 1.90 dBmV | 43.38 dB | 0 | 0 |
| 8 | Locked | 256QAM | 8 | 597.00 MHz | 1.80 dBmV | 44.63 dB | 0 | 0 |
| 9 | Locked | 256QAM | 9 | 603.00 MHz | 1.80 dBmV | 40.95 dB | 0 | 0 |
| 10 | Locked | 256QAM | 10 | 609.00 MHz | 2.20 dBmV | 43.38 dB | 0 | 0 |
| 11 | Locked | 256QAM | 11 | 615.00 MHz | 2.00 dBmV | 43.38 dB | 0 | 0 |
| 12 | Locked | 256QAM | 12 | 621.00 MHz | 1.80 dBmV | 43.38 dB | 0 | 0 |
| 13 | Locked | 256QAM | 13 | 627.00 MHz | 1.90 dBmV | 43.38 dB | 22 | 0 |
| 14 | Locked | 256QAM | 14 | 633.00 MHz | 2.00 dBmV | 40.95 dB | 0 | 0 |
| 15 | Locked | 256QAM | 15 | 639.00 MHz | 2.30 dBmV | 40.37 dB | 0 | 0 |
| 16 | Locked | 256QAM | 16 | 645.00 MHz | 2.20 dBmV | 40.95 dB | 0 | 0 |
| 17 | Locked | 256QAM | 17 | 651.00 MHz | 2.00 dBmV | 44.63 dB | 0 | 0 |
| 18 | Locked | 256QAM | 18 | 657.00 MHz | 2.30 dBmV | 43.38 dB | 0 | 0 |
| 19 | Locked | 256QAM | 19 | 663.00 MHz | 2.60 dBmV | 43.38 dB | 0 | 0 |
| 20 | Locked | 256QAM | 20 | 669.00 MHz | 2.50 dBmV | 40.95 dB | 0 | 0 |
| 21 | Locked | 256QAM | 21 | 675.00 MHz | 2.30 dBmV | 43.38 dB | 0 | 0 |
| 22 | Locked | 256QAM | 22 | 681.00 MHz | 2.30 dBmV | 40.95 dB | 0 | 0 |
| 23 | Locked | 256QAM | 23 | 687.00 MHz | 2.60 dBmV | 40.95 dB | 0 | 0 |
| 24 | Locked | 256QAM | 24 | 693.00 MHz | 2.70 dBmV | 43.38 dB | 0 | 0 |
| 25 | Locked | 256QAM | 25 | 699.00 MHz | 2.60 dBmV | 42.60 dB | 0 | 0 |
| 26 | Locked | 256QAM | 26 | 705.00 MHz | 2.40 dBmV | 41.90 dB | 0 | 0 |
| 27 | Locked | 256QAM | 27 | 711.00 MHz | 2.70 dBmV | 41.90 dB | 0 | 0 |
| 28 | Locked | 256QAM | 28 | 717.00 MHz | 2.70 dBmV | 41.90 dB | 0 | 0 |
| 29 | Locked | 256QAM | 29 | 723.00 MHz | 2.80 dBmV | 41.90 dB | 0 | 0 |
| 30** | Not Locked | ---- | 30 | 729.00 MHz | ---- | ---- | ---- | ---- |
| 31 | Locked | 256QAM | 31 | 735.00 MHz | 2.50 dBmV | 36.90 dB | 82213 | 138823 |
| 32 | Locked | 256QAM | 32 | 741.00 MHz | 2.70 dBmV | 41.90 dB | 12 | 0 |
**Note: channel 30 fluctuates between not locked and locked but with high amounts of uncorrectables.
| Upstream Bonded Channels | ||||||
|---|---|---|---|---|---|---|
| Channel | Lock Status | US Channel Type | Channel ID | Symbol Rate | Frequency | Power |
| 1 | Locked | ATDMA | 1 | 5120 kSym/s | 16.40 MHz | 40.50 dBmV |
| 2 | Locked | ATDMA | 6 | 2560 kSym/s | 10.40 MHz | 39.96 dBmV |
| 3 | Locked | ATDMA | 5 | 2560 kSym/s | 40.40 MHz | 41.25 dBmV |
| 4 | Locked | ATDMA | 4 | 5120 kSym/s | 35.60 MHz | 41.25 dBmV |
| 5 | Locked | ATDMA | 3 | 5120 kSym/s | 29.20 MHz | 40.75 dBmV |
| 6 | Locked | ATDMA | 2 | 5120 kSym/s | 22.80 MHz | 40.75 dBmV |
Event Log
| Time | Priority | Description |
|---|---|---|
| Tue Aug 17 07:09:55 2021 | 5 | RCS Partial Service;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"]CM-QOS=1.1;CM-VER=3.0; |
| Tue Aug 17 07:10:09 2021 | 5 | Lost MDD Timeout;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.0; |
| Tue Aug 17 07:10:13 2021 | 5 | RCS Partial Service;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.0; |
| Tue Aug 17 07:10:48 2021 | 5 | Lost MDD Timeout;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.0; |
| Tue Aug 17 07:10:48 2021 | 5 | RCS Partial Service;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.0; |
| Tue Aug 17 07:10:56 2021 | 5 | Lost MDD Timeout;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.0; |
| Tue Aug 17 07:10:57 2021 | 5 | RCS Partial Service;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.0; |
| Tue Aug 17 07:11:00 2021 | 5 | Lost MDD Timeout;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.0; |
| Tue Aug 17 07:11:01 2021 | 5 | RCS Partial Service;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.0; |
| Tue Aug 17 07:12:02 2021 | 5 | Lost MDD Timeout;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.0; |
| Tue Aug 17 07:12:05 2021 | 5 | RCS Partial Service;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.0; |
| Tue Aug 17 07:12:12 2021 | 5 | Lost MDD Timeout;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.0; |
| Tue Aug 17 07:12:18 2021 | 5 | RCS Partial Service;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.0; |
| Tue Aug 17 07:13:38 2021 | 5 | Lost MDD Timeout;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.0; |
| Tue Aug 17 07:13:39 2021 | 5 | RCS Partial Service;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.0; |
| Tue Aug 17 07:14:32 2021 | 5 | Lost MDD Timeout;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.0; |
| Tue Aug 17 07:14:36 2021 | 5 | RCS Partial Service;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.0; |
| Tue Aug 17 07:14:40 2021 | 5 | Lost MDD Timeout;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.0; |
| Tue Aug 17 07:14:41 2021 | 5 | RCS Partial Service;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.0; |
| Tue Aug 17 07:15:16 2021 | 5 | Lost MDD Timeout;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.0; |
Does anyone have any feedback based on the stats above? I'm happy to provide any additional information that might be helpful.
No Responses!