Community Forum

Upstream Channels not locked

New Poster

Upstream Channels not locked



I am looking at my newly installed modem and noticed several channels are showing as not locked.  Additionally I'm seeing a flurry of warnings in the logs.  Is this expected?


Upstream Bonded Channels (Partial Service)
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1LockedATDMA55120 Ksym/sec36500000 Hz45 dBmV
2Not LockedUnknown60 Ksym/sec30100000 Hz0.0 dBmV
3Not LockedUnknown70 Ksym/sec23700000 Hz0.0 dBmV
4Not LockedUnknown80 Ksym/sec17300000 Hz0.0 dBmV
5Not LockedUnknown00 Ksym/sec0 Hz0.0 dBmV
6Not LockedUnknown00 Ksym/sec0 Hz0.0 dBmV
7Not LockedUnknown00 Ksym/sec0 Hz0.0 dBmV
8Not LockedUnknown00 Ksym/sec0 Hz0.0 dBmV


Thu Aug 06 08:31:09 2020Critical (3)No Ranging Response received - T3 time-out;CM-MAC=28:80:88:d4:57:a0;CMTS-MAC=00:9e:1e:59:cb:90;CM-QOS=1.1;CM-VER=3.1;
Thu Aug 06 08:30:19 2020Critical (3)16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=28:80:88:d4:57:a0;CMTS-MAC=00:9e:1e:59:cb:90;CM-QOS=1.1;CM-VER=3.1;
Thu Aug 06 08:30:19 2020Critical (3)Ranging Request Retries exhausted;CM-MAC=28:80:88:d4:57:a0;CMTS-MAC=00:9e:1e:59:cb:90;CM-QOS=1.1;CM-VER=3.1;




Gold Problem Solver

Re: Upstream Channels not locked

You should have a Comcast premise tech take a look at this. At least 3 upstream channels should be locked. You may have a trap on your coax line.


Call the phone number on your bill or 1-800-Comcast, or use one of the options on Insist they send a tech out to identify the cause and correct it.