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GrannyW
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Saturday, April 26th, 2025 7:06 AM

Question about intermittent connection issues

Hi!  I use an Arris SB8200v3 DOCSIS 3.1 cable modem and 98% of the time, everything works perfectly.  The internet service is fast, reliable and stable.  That is, until it isn't.  :)  Periodically, the cable modem will lose the connection and will reconnect.  Some days, this doesn't happen and on other days, it can happen 3 or 4 times in the span of a few hours.  Before I replace the cable modem, I wanted to see if the current operating parameters look acceptable:

Procedure Status Comment
Acquire Downstream Channel 399000000 Hz Locked
Connectivity State OK Partial Service (DS only)
Boot State OK Partial Service (DS only)
Configuration File OK
Security Enabled BPI+
DOCSIS Network Access Enabled Allowed

Channel ID Lock Status Modulation Frequency Power SNR/MER Corrected Uncorrectables
20 Locked 256QAM 495000000 Hz 1 dBmV 40 dB 0 0
4 Locked 256QAM 399000000 Hz 3 dBmV 40 dB 0 0
12 Locked 256QAM 447000000 Hz 3 dBmV 40 dB 293 1122
28 Locked 256QAM 543000000 Hz 1 dBmV 40 dB 329 948
1 Locked 256QAM 381000000 Hz 3 dBmV 40 dB 251 1020
2 Locked 256QAM 387000000 Hz 3 dBmV 40 dB 301 1037
3 Locked 256QAM 393000000 Hz 3 dBmV 40 dB 279 966
5 Locked 256QAM 405000000 Hz 3 dBmV 40 dB 268 1137
6 Locked 256QAM 411000000 Hz 3 dBmV 40 dB 320 983
7 Locked 256QAM 417000000 Hz 3 dBmV 40 dB 261 1216
8 Locked 256QAM 423000000 Hz 3 dBmV 40 dB 453 838
9 Locked 256QAM 429000000 Hz 3 dBmV 40 dB 419 1021
10 Locked 256QAM 435000000 Hz 3 dBmV 40 dB 281 974
11 Locked 256QAM 441000000 Hz 3 dBmV 40 dB 236 1003
13 Locked 256QAM 453000000 Hz 2 dBmV 40 dB 293 1017
14 Locked 256QAM 459000000 Hz 2 dBmV 40 dB 301 1130
15 Locked 256QAM 465000000 Hz 2 dBmV 40 dB 284 1105
16 Locked 256QAM 471000000 Hz 1 dBmV 40 dB 318 987
17 Locked 256QAM 477000000 Hz 2 dBmV 40 dB 275 1030
18 Locked 256QAM 483000000 Hz 1 dBmV 40 dB 290 1022
19 Locked 256QAM 489000000 Hz 1 dBmV 40 dB 240 1057
21 Locked 256QAM 501000000 Hz 1 dBmV 40 dB 289 1101
22 Locked 256QAM 507000000 Hz 0 dBmV 40 dB 267 1055
23 Locked 256QAM 513000000 Hz 0 dBmV 40 dB 449 875
24 Locked 256QAM 519000000 Hz 0 dBmV 40 dB 422 857
25 Locked 256QAM 525000000 Hz 1 dBmV 40 dB 254 1173
26 Locked 256QAM 531000000 Hz 1 dBmV 40 dB 262 1199
27 Locked 256QAM 537000000 Hz 1 dBmV 40 dB 306 1048
29 Locked 256QAM 549000000 Hz 1 dBmV 40 dB 317 1134
30 Locked 256QAM 555000000 Hz 0 dBmV 40 dB 251 1084
31 Locked 256QAM 561000000 Hz 0 dBmV 40 dB 219 1163
32 Locked 256QAM 567000000 Hz 1 dBmV 40 dB 266 1102
194 Locked OFDM PLC 957000000 Hz -12 dBmV 33 dB 179795852 199
193 Locked OFDM PLC 722000000 Hz -4 dBmV 39 dB 176098146 288



Channel ID Lock Status US Channel Type Frequency Width Power
20 Locked SC-QAM 35600000 Hz 6400000 40.0 dBmV
17 Locked SC-QAM 16400000 Hz 6400000 38.0 dBmV
19 Locked SC-QAM 29200000 Hz 6400000 39.0 dBmV
18 Locked SC-QAM 22800000 Hz 6400000 38.0 dBmV



In the cable modem log, I'll see messages like these:

critical
No Ranging Response received - T3 time-out;CM-MAC=[redacted];CMTS-MAC=[redacted];CM-QOS=1.1;CM-VER=3.1;



critical
SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=[redacted];CMTS-MAC=[redacted];CM-QOS=1.1;CM-VER=3.1;

warning
Lost MDD Timeout;CM-MAC=[redacted];CMTS-MAC=[redacted];CM-QOS=1.1;CM-VER=3.1;

warning
RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=[redacted];CMTS-MAC=[redacted];CM-QOS=1.1;CM-VER=3.1;

critical
No Ranging Response received - T3 time-out;CM-MAC=[redacted];CMTS-MAC=[redacted];CM-QOS=1.1;CM-VER=3.1;



This all started after a couple of things:

*)  A power outage "zapped" my old cable modem and it just wouldn't get reconnected after the power came back.  So, I purchased the Arris.

*)  Comcast was doing some maintenance, in my area, to improve the quality of internet service.

When I conduct a test of my internet service from the XFinity internet usage page, everything checks out fine.

Given the information I posted above, would it be worth replacing the cable modem?   The Arris modem I'm using now was purchased in February or March of this year.

Thanks in advance for any advice or tips you can provide!











Question

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Updated 

9 hours ago

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GrannyW

Contributor

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23 Messages

9 hours ago

Hello again!   So, around 7:30am PDT this morning (April 26, 2025), I checked the cable modem (the Arris) and the stats look much different:

Procedure Status Comment
Acquire Downstream Channel 495000000 Hz Locked
Connectivity State OK Operational
Boot State OK Operational
Configuration File OK
Security Enabled BPI+
DOCSIS Network Access Enabled

Allowed

Channel ID Lock Status Modulation Frequency Power SNR/MER Corrected Uncorrectables
20 Locked 256QAM 495000000 Hz 2 dBmV 40 dB 0 0
4 Locked 256QAM 399000000 Hz 3 dBmV 40 dB 0 0
12 Locked 256QAM 447000000 Hz 4 dBmV 40 dB 11 0
28 Locked 256QAM 543000000 Hz 1 dBmV 40 dB 11 0
1 Locked 256QAM 381000000 Hz 3 dBmV 40 dB 9 0
2 Locked 256QAM 387000000 Hz 3 dBmV 40 dB 10 0
3 Locked 256QAM 393000000 Hz 3 dBmV 40 dB 4 0
5 Locked 256QAM 405000000 Hz 3 dBmV 40 dB 8 0
6 Locked 256QAM 411000000 Hz 3 dBmV 40 dB 15 0
7 Locked 256QAM 417000000 Hz 3 dBmV 40 dB 7 0
8 Locked 256QAM 423000000 Hz 3 dBmV 40 dB 9 0
9 Locked 256QAM 429000000 Hz 3 dBmV 40 dB 7 0
10 Locked 256QAM 435000000 Hz 3 dBmV 40 dB 7 0
11 Locked 256QAM 441000000 Hz 3 dBmV 43 dB 17 0
13 Locked 256QAM 453000000 Hz 3 dBmV 40 dB 6 0
14 Locked 256QAM 459000000 Hz 2 dBmV 40 dB 13 0
15 Locked 256QAM 465000000 Hz 2 dBmV 40 dB 2 0
16 Locked 256QAM 471000000 Hz 2 dBmV 40 dB 10 0
17 Locked 256QAM 477000000 Hz 2 dBmV 40 dB 12 0
18 Locked 256QAM 483000000 Hz 2 dBmV 40 dB 6 0
19 Locked 256QAM 489000000 Hz 1 dBmV 40 dB 17 0
21 Locked 256QAM 501000000 Hz 1 dBmV 40 dB 6 0
22 Locked 256QAM 507000000 Hz 1 dBmV 40 dB 19 0
23 Locked 256QAM 513000000 Hz 1 dBmV 40 dB 3 0
24 Locked 256QAM 519000000 Hz 1 dBmV 40 dB 1 0
25 Locked 256QAM 525000000 Hz 1 dBmV 40 dB 1 0
26 Locked 256QAM 531000000 Hz 1 dBmV 40 dB 6 0
27 Locked 256QAM 537000000 Hz 1 dBmV 40 dB 8 0
29 Locked 256QAM 549000000 Hz 1 dBmV 40 dB 8 0
30 Locked 256QAM 555000000 Hz 1 dBmV 40 dB 1 0
31 Locked 256QAM 561000000 Hz 1 dBmV 40 dB 1 0
32 Locked 256QAM 567000000 Hz 1 dBmV 40 dB 1 0
194 Locked OFDM PLC 957000000 Hz -11 dBmV 34 dB 56254423 0
193 Locked OFDM PLC 722000000 Hz -4 dBmV 39 dB 56198761 0

Channel ID Lock Status US Channel Type Frequency Width Power
20 Locked SC-QAM 35600000 Hz 6400000 40.0 dBmV
17 Locked SC-QAM 16400000 Hz 6400000 38.0 dBmV
19 Locked SC-QAM 29200000 Hz 6400000 39.0 dBmV
18 Locked SC-QAM 22800000 Hz 6400000 38.0 dBmV

I presume the 0 'Uncorrectables' is a good thing, but I'm not sure.    Anyway, from what I posted in this thread, should I still consider replacing my cable modem?

Thanks again!

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