4 Messages
No DOCSIS 3.1 signal on Arris SB8200 - newly provisioned
Hello. I recently switched out my older SB6183 modem for an SP8200, because I have a 600mbs plan but the Xfinity app said my max download speed was only 400mbs. I connected the new modem and activated it on my account through the Xfinity app last night. However, I am not showing any DOCSIS 3.1 connection according to the status lights. I have tried to reboot the modem again this morning, and still no luck. I am not sure if I am missing something, but would love some help. Below is my modem status and channels.
| Procedure | Status | Comment |
| Acquire Downstream Channel | 537000000 Hz | Locked |
| Connectivity State | OK | Operational |
| Boot State | OK | Operational |
| Configuration File | OK | |
| Security | Enabled | BPI+ |
| DOCSIS Network Access Enabled | Allowed |
| Downstream Bonded Channels | |||||||
|---|---|---|---|---|---|---|---|
| Channel ID | Lock Status | Modulation | Frequency | Power | SNR/MER | Corrected | Uncorrectables |
| 20 | Locked | 256QAM | 537000000 Hz | -4 dBmV | 38 dB | 0 | 0 |
| 28 | Locked | 256QAM | 585000000 Hz | -5 dBmV | 38 dB | 0 | 0 |
| 36 | Locked | 256QAM | 633000000 Hz | -6 dBmV | 38 dB | 0 | 0 |
| 44 | Locked | 256QAM | 681000000 Hz | -7 dBmV | 38 dB | 0 | 0 |
| 13 | Locked | 256QAM | 489000000 Hz | -4 dBmV | 38 dB | 0 | 0 |
| 14 | Locked | 256QAM | 495000000 Hz | -4 dBmV | 38 dB | 0 | 0 |
| 15 | Locked | 256QAM | 507000000 Hz | -4 dBmV | 38 dB | 0 | 0 |
| 16 | Locked | 256QAM | 513000000 Hz | -4 dBmV | 38 dB | 0 | 0 |
| 17 | Locked | 256QAM | 519000000 Hz | -4 dBmV | 38 dB | 0 | 0 |
| 18 | Locked | 256QAM | 525000000 Hz | -4 dBmV | 38 dB | 0 | 0 |
| 19 | Locked | 256QAM | 531000000 Hz | -4 dBmV | 38 dB | 0 | 0 |
| 21 | Locked | 256QAM | 543000000 Hz | -4 dBmV | 38 dB | 0 | 0 |
| 22 | Locked | 256QAM | 549000000 Hz | -4 dBmV | 38 dB | 0 | 0 |
| 23 | Locked | 256QAM | 555000000 Hz | -4 dBmV | 38 dB | 0 | 0 |
| 24 | Locked | 256QAM | 561000000 Hz | -4 dBmV | 38 dB | 0 | 0 |
| 25 | Locked | 256QAM | 567000000 Hz | -4 dBmV | 38 dB | 0 | 0 |
| 26 | Locked | 256QAM | 573000000 Hz | -5 dBmV | 38 dB | 0 | 0 |
| 27 | Locked | 256QAM | 579000000 Hz | -5 dBmV | 38 dB | 0 | 0 |
| 29 | Locked | 256QAM | 591000000 Hz | -5 dBmV | 38 dB | 2 | 0 |
| 30 | Locked | 256QAM | 597000000 Hz | -5 dBmV | 38 dB | 2 | 0 |
| 31 | Locked | 256QAM | 603000000 Hz | -6 dBmV | 38 dB | 7 | 0 |
| 32 | Locked | 256QAM | 609000000 Hz | -7 dBmV | 38 dB | 0 | 0 |
| 33 | Locked | 256QAM | 615000000 Hz | -7 dBmV | 37 dB | 0 | 0 |
| 34 | Locked | 256QAM | 621000000 Hz | -8 dBmV | 37 dB | 0 | 0 |
| 35 | Locked | 256QAM | 627000000 Hz | -7 dBmV | 37 dB | 0 | 0 |
| 37 | Locked | 256QAM | 639000000 Hz | -6 dBmV | 38 dB | 0 | 0 |
| 38 | Locked | 256QAM | 645000000 Hz | -6 dBmV | 38 dB | 0 | 0 |
| 39 | Locked | 256QAM | 651000000 Hz | -6 dBmV | 38 dB | 0 | 0 |
| 40 | Locked | 256QAM | 657000000 Hz | -6 dBmV | 38 dB | 0 | 0 |
| 41 | Locked | 256QAM | 663000000 Hz | -6 dBmV | 38 dB | 0 | 0 |
| 42 | Locked | 256QAM | 669000000 Hz | -6 dBmV | 38 dB | 0 | 0 |
| 43 | Locked | 256QAM | 675000000 Hz | -7 dBmV | 38 dB | 0 | 0 |
| 193 | Locked | OFDM PLC | 805000000 Hz | -9 dBmV | 38 dB | 13981358 | 1 |
| Upstream Bonded Channels | ||||||
|---|---|---|---|---|---|---|
| Channel ID | Lock Status | US Channel Type | Frequency | Width | Power | |
| 5 | Locked | SC-QAM | 40400000 Hz | 3200000 | 47.0 dBmV | |
| 6 | Locked | SC-QAM | 10400000 Hz | 3200000 | 49.0 dBmV | |
| 1 | Locked | SC-QAM | 16400000 Hz | 6400000 | 48.0 dBmV | |
| 4 | Locked | SC-QAM | 35600000 Hz | 6400000 | 48.0 dBmV | |
| 3 | Locked | SC-QAM | 29200000 Hz | 6400000 | 48.0 dBmV | |
| 2 | Locked | SC-QAM | 22800000 Hz | 6400000 | 48.0 dBmV | |
| Date Time | Event Level | Description |
|---|---|---|
| 18/04/2025 06:30:11 | notice | GUI Login Status - Login Success from LAN interface; client ip=[75.71.69.57];CM-CM-QOS=1.1;CM-VER=3.1; |
| 18/04/2025 06:19:57 | notice | REGISTRATION COMPLETE - Waiting for Operational status;CM-;CM-QOS=1.1;CM-VER=3.1; |
| 18/04/2025 06:19:55 | critical | No Ranging Response received - T3 time-out;CM7;CMTS-S=1.1;CM-VER=3.1; |
| 18/04/2025 06:19:54 | warning | RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-;CM-QOS=1.1;CM-VER=3.1; |
| 18/04/2025 06:19:49 | critical | Config File Rejected due to Invalid or Unexpected TLV 11;CM-;CM-QOS=1.1;CM-VER=3.1; |
| 18/04/2025 06:19:49 | notice | TLV-11 - unrecognized OID;CM-CMTS-CM-QOS=1.1;CM-VER=3.1; |
| 18/04/2025 06:19:47 | warning | MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-;CM-QOS=1.1;CM-VER=3.1; |
| 18/04/2025 06:19:47 | notice | CMSTATUS:DS_Diplexer_Mode_Change_Ignored:[TLV-84.3], [1002MHZ];CM-;CM-QOS=1.1;CM-VER=3.1; |
| 18/04/2025 06:19:47 | notice | CMSTATUS:DS_Diplexer_Mode_Change_Ignored:[TLV-84.2], [108MHZ];CM-;CM-QOS=1.1;CM-VER=3.1; |
| 18/04/2025 06:19:47 | notice | CMSTATUS:US_Diplexer_Mode_Change:[TLV-84.1], [5-42MHZ];CM-00;CM-QOS=1.1;CM-VER=3.1; |
| 31/12/1969 17:01:25 | notice | CMSTATUS:DS_Diplexer_Mode_Change_Ignored:[TLV-21.3], [1002MHZ];CM-:02:00;CM-QOS=1.1;CM-VER=3.1; |
| 31/12/1969 17:01:25 | notice | CMSTATUS:DS_Diplexer_Mode_Change_Ignored:[TLV-21.2], [258MHZ];CM-02:00;CM-QOS=1.1;CM-VER=3.1; |
| 31/12/1969 17:01:25 | notice | CMSTATUS:US_Diplexer_Mode_Change:[TLV-21.1], [5-42MHZ];CM-2:00;CM-QOS=1.1;CM-VER=3.1; |
| 31/12/1969 17:01:25 | notice | CMSTATUS:US_Diplexer_Mode_Change:[TLV-9], [5-85MHZ];CM-02:00;CM-QOS=1.1;CM-VER=3.1; |
| 31/12/1969 17:01:24 | notice | Honoring MDD; IP provisioning mode = IPv6;CM-;CM-QOS=1.1;CM-VER=3.1; |
| 31/12/1969 17:01:20 | notice | CMSTATUS:DS_Diplexer_Mode_Change:Init, [108-1002MHZ];CM-;CM-QOS=1.1;CM-VER=3.1; |
| 31/12/1969 17:01:20 | notice | CMSTATUS:US_Diplexer_Mode_Change:Init, [5-42MHZ];CM-CM-QOS=1.1;CM-VER=3.1; |
| 18/04/2025 06:17:40 | critical | Unicast Ranging Received Abort Response - initializing MAC;CM-00;CM-QOS=1.1;CM-VER=3.1; |
| 18/04/2025 06:17:38 | notice | Cable Modem Reboot from SNMP;CM-:02:00;CM-QOS=1.1;CM-VER=3.1; |
| 18/04/2025 06:08:38 | notice | CM-STATUS message sent. Event Type Code: 5; Chan ID: 43; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-:02:00;CM-QOS=1.1;CM-VER=3.1; |
| 18/04/2025 06:04:58 | notice | GUI Login Status - Login Success from LAN interface; client ip=[75.71.69.57];CM-;CM-QOS=1.1;CM-VER=3.1; |
| 17/04/2025 21:56:03 | notice | REGISTRATION COMPLETE - Waiting for Operational status;CM-02:00;CM-QOS=1.1;CM-VER=3.1; |
| 17/04/2025 21:55:59 | critical | No Ranging Response received - T3 time-out;CM-02:00;CM-QOS=1.1;CM-VER=3.1; |
| 17/04/2025 21:55:58 | warning | RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-2:00;CM-QOS=1.1;CM-VER=3.1; |
| 17/04/2025 21:55:53 | critical | Config File Rejected due to Invalid or Unexpected TLV 11;CM-;CM-QOS=1.1;CM-VER=3.1; |
| 17/04/2025 21:55:53 | notice | TLV-11 - unrecognized OID;CM-0;CM-QOS=1.1;CM-VER=3.1; |
| 17/04/2025 21:55:51 | warning | MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-02:00;CM-QOS=1.1;CM-VER=3.1; |
| 17/04/2025 21:55:51 | notice | CMSTATUS:DS_Diplexer_Mode_Change_Ignored:[TLV-84.3], [1002MHZ];CM-;CM-QOS=1.1;CM-VER=3.1; |
| 17/04/2025 21:55:51 | notice | CMSTATUS:DS_Diplexer_Mode_Change_Ignored:[TLV-84.2], [108MHZ];CM-02:00;CM-QOS=1.1;CM-VER=3.1; |
| 17/04/2025 21:55:51 | notice | CMSTATUS:US_Diplexer_Mode_Change:[TLV-84.1], [5-42MHZ];CM-;CM-QOS=1.1;CM-VER=3.1; |
| 31/12/1969 17:01:24 | notice | CMSTATUS:DS_Diplexer_Mode_Change_Ignored:[TLV-21.3], [1002MHZ];CM-02:00;CM-QOS=1.1;CM-VER=3.1; |
| 31/12/1969 17:01:24 | notice | CMSTATUS:DS_Diplexer_Mode_Change_Ignored:[TLV-21.2], [258MHZ];CM-0;CM-QOS=1.1;CM-VER=3.1; |
| 31/12/1969 17:01:24 | notice | CMSTATUS:US_Diplexer_Mode_Change:[TLV-21.1], [5-42MHZ];CM-02:00;CM-QOS=1.1;CM-VER=3.1; |
| 31/12/1969 17:01:24 | notice | CMSTATUS:US_Diplexer_Mode_Change:[TLV-9], [5-85MHZ];CM-2:00;CM-QOS=1.1;CM-VER=3.1; |
| 31/12/1969 17:01:24 | notice | Honoring MDD; IP provisioning mode = IPv6;CM-02:00;CM-QOS=1.1;CM-VER=3.1; |
| 31/12/1969 17:01:20 | notice | CMSTATUS:DS_Diplexer_Mode_Change:Init, [108-1002MHZ];CM-;CM-QOS=1.1;CM-VER=3.1; |
| 31/12/1969 17:01:20 | notice | CMSTATUS:US_Diplexer_Mode_Change:Init, [5-42MHZ];CM-;CM-QOS=1.1;CM-VER=3.1; |
| 17/04/2025 21:53:43 | critical | Unicast Ranging Received Abort Response - initializing MAC;CM-0;CM-QOS=1.1;CM-VER=3.1; |
| 17/04/2025 21:53:41 | notice | Cable Modem Reboot from SNMP;CM-02:00;CM-QOS=1.1;CM-VER=3.1; |
| 17/04/2025 21:52:51 | notice | CM-STATUS message sent. Event Type Code: 5; Chan ID: 27; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-0;CM-QOS=1.1;CM-VER=3.1; |
EG
Expert
•
117.1K Messages
1 year ago
Regardless of what the indicator lights may show, the signal status output shows that a downstream DOCSIS 3.1 (OFDM) channel is indeed locked in;
However, the signal strength of it is on the low / weak side (out of spec). All of the other bonded downstream QAM channels are on the low / weak side as well. And the upstream channel power levels are also borderline / too high. There is a connection impairment somewhere. This should be addressed regardless of any thing else.
In an effort to try to obtain better connectivity / more wiggle room, check to see if there are any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1002 MHz, bi-directional, and no gold colored garbage from Home Depot, Target, Wal-Mart, etc. Splitters should be swapped with known to be good / new ones to test.
Also check the coax cable for any damage such as cuts, nicks, abrasions, kinks, sharp bends, animal chews.
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 check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.
Good luck with it !
(edited)
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EG
Expert
•
117.1K Messages
1 year ago
The stats are much better / well within specs now ! And it's still showing that a downstream DOCSIS 3.1 / OFDM channel is locked in regardless of the receive light. It may be a firmware glitch. Try hard resetting the 8200 back to factory defaults by pressing and holding in the recessed reset button on the rear for 30 seconds and see. This can sometimes clear up some weird behavior issues.
Is there a router / WiFi in the mix here ? The speeds may be an issue with the modem's provisioning. Try contacting a rep and have them confirm that the provisioning is correct and complete. And that the correct configuration / bootfile is being pushed to the modem.
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EG
Expert
•
117.1K Messages
1 year ago
Quite welcome @XfinityEva !
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