CM1200 Modem Log has same single entry all the time

We've been troubleshooting network dropout issues and trying to glean some info from the modem log. The problem is every time it is accessed the same entry exists "Started Unicast Maintenance Rangin...

FURRYe38

Guru - Experienced User

Dec 19, 2023

Has a factory reset been performed on the modem with out the ISP coax cable connected to the modem?

Please post a copy and paste of the modems connection status and event log page.
https://kb.netgear.com/30007/How-do-I-obtain-the-cable-connection-information-from-a-NETGEAR-cable-modem-modem-router
https://kb.netgear.com/30008/How-do-I-view-or-clear-the-event-logs-on-my-NETGEAR-cable-modem-or-modem-router

Any Criticals, Errors or Warnings seen in the event logs needs to be reviewed and resolved by the ISP. Indicates a signal issue on the ISP line up to the modem.

Be sure your using a good quality LAN cable between the modem and router. CAT6 is recommended.
What is the brand and model of the host wifi router connected to the modem?

jf6791

Guide

Dec 26, 2023

So after a factory reset the logs are back to normal - as far as retaining older entries. Screenshots of levels and logs are below. The router is an RAXE500.

Procedure	Status	Comment
Acquire Downstream Channel	603000000 Hz	Locked
Connectivity State	OK	Operational
Boot State	OK	Operational
Security	Enabled	BPI+
IP Provisioning Mode	Honor MDD	honorMdd(4)

Downstream Bonded Channels

Channel	Lock Status	Modulation	Channel ID	Frequency	Power	SNR	Correctables	Uncorrectables
1	Locked	QAM256	29	603000000 Hz	4 dBmV	43.2 dB	0	0
2	Locked	QAM256	13	507000000 Hz	3 dBmV	43.1 dB	0	0
3	Locked	QAM256	14	513000000 Hz	3 dBmV	43.1 dB	0	0
4	Locked	QAM256	15	519000000 Hz	2.7 dBmV	43 dB	0	0
5	Locked	QAM256	16	525000000 Hz	3.1 dBmV	43.1 dB	0	0
6	Locked	QAM256	17	531000000 Hz	3.2 dBmV	43.1 dB	0	0
7	Locked	QAM256	18	537000000 Hz	3 dBmV	43 dB	0	0
8	Locked	QAM256	19	543000000 Hz	2.8 dBmV	43 dB	0	0
9	Locked	QAM256	20	549000000 Hz	2.7 dBmV	42.9 dB	0	0
10	Locked	QAM256	21	555000000 Hz	2.8 dBmV	42.9 dB	0	0
11	Locked	QAM256	22	561000000 Hz	3 dBmV	42.9 dB	0	0
12	Locked	QAM256	23	567000000 Hz	3.4 dBmV	43.1 dB	0	0
13	Locked	QAM256	24	573000000 Hz	3.4 dBmV	43.1 dB	0	0
14	Locked	QAM256	25	579000000 Hz	3.5 dBmV	43.1 dB	0	0
15	Locked	QAM256	26	585000000 Hz	3.6 dBmV	43.1 dB	0	0
16	Locked	QAM256	27	591000000 Hz	3.7 dBmV	43.2 dB	0	0
17	Locked	QAM256	28	597000000 Hz	3.7 dBmV	43.2 dB	0	0
18	Locked	QAM256	30	609000000 Hz	3.9 dBmV	42.9 dB	0	0
19	Locked	QAM256	31	615000000 Hz	3.7 dBmV	42.8 dB	0	0
20	Locked	QAM256	32	621000000 Hz	4.2 dBmV	43.1 dB	0	0
21	Locked	QAM256	33	627000000 Hz	4.2 dBmV	43.1 dB	0	0
22	Locked	QAM256	34	633000000 Hz	3.9 dBmV	43 dB	0	0
23	Locked	QAM256	35	639000000 Hz	3.8 dBmV	42.9 dB	0	0
24	Locked	QAM256	36	645000000 Hz	3.8 dBmV	42.9 dB	0	0
25	Locked	QAM256	37	651000000 Hz	3.5 dBmV	42.7 dB	0	0
26	Locked	QAM256	38	657000000 Hz	3.1 dBmV	42.6 dB	0	0
27	Locked	QAM256	39	663000000 Hz	2 dBmV	41.9 dB	0	0
28	Locked	QAM256	40	669000000 Hz	1.4 dBmV	41.6 dB	0	0
29	Locked	QAM256	41	675000000 Hz	2.5 dBmV	41.7 dB	0	0
30	Locked	QAM256	42	681000000 Hz	3.1 dBmV	42.9 dB	0	0
31	Locked	QAM256	43	687000000 Hz	3.5 dBmV	43 dB	0	0
32	Locked	QAM256	44	693000000 Hz	3.4 dBmV	43 dB	0	0

Upstream Bonded Channels

Channel	Lock Status	US Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	2	5120 Ksym/sec	16400000 Hz	50.3 dBmV
2	Locked	ATDMA	3	5120 Ksym/sec	22800000 Hz	50.3 dBmV
3	Locked	ATDMA	4	5120 Ksym/sec	29200000 Hz	49.8 dBmV
4	Locked	ATDMA	5	5120 Ksym/sec	35600000 Hz	49.8 dBmV
5	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0.0 dBmV
6	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0.0 dBmV
7	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0.0 dBmV
8	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0.0 dBmV

Downstream OFDM Channels

Channel	Lock Status	Modulation / Profile ID	Channel ID	Frequency	Power	SNR / MER	Active Subcarrier Number Range	Unerrored Codewords	Correctable Codewords	Uncorrectable Codewords
1	Locked	0 ,1 ,2 ,3	159	702000000 Hz	4.9 dBmV	43.2 dB	1126 ~ 2969	336941441	61659	0
2	Not Locked	0	0	0 Hz	0 dBmV	0.0 dB	0 ~ 4095	0	0	0

Upstream OFDMA Channels

Channel	Lock Status	Modulation / Profile ID	Channel ID	Frequency	Power
1	Not Locked	0	0	0 Hz	0 dBmV
2	Not Locked	0	0	0 Hz	0 dBmV

Extended Upstream Transmit Power

Enable Extended Upstream Transmit Power

Current System Time:Tue Dec 26 21:02:09 2023

System Up Time:02:49:32

Clear Log Refresh

Time	Priority	Description
Tue Dec 26 20:36:59 2023	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
Tue Dec 26 18:25:34 2023	Notice (6)	CM-STATUS message sent. Event Type Code: 3; Chan ID: N/A; DSID: �; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
Tue Dec 26 18:25:30 2023	Warning (5)	DBC-REQ Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
Tue Dec 26 18:25:30 2023	Critical (3)	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=28:80:88:b3:96:68;CMTS-MAC=04:2a:e2:c7:7c:ed;CM-QOS=1.1;CM-VER=3.1;
Tue Dec 26 18:19:45 2023	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=;CMTS-MAC;CM-QOS=1.1;CM-VER=3.1;

FURRYe38
Guru - Experienced User
Dec 26, 2023
Any Criticals, Errors or Warnings seen in the event logs needs to be reviewed and resolved by the ISP. Indicates a signal issue on the ISP line up to the modem.

Be sure your using a good quality LAN cable between the modem and router. CAT6A STA

Have the ISP check the signal and line quality UP to the modem. Be sure the ISP provisions the modem correctly.
Be sure there are no coax cable line splitters in the between the modem and ISP service box.
Be sure your using good quality RG6 coax cable up to the modem.
Start with removing any amplifiers, signal attenuators, or splitters from the coax.
From there check the line for kinks, damage, moisture in the line.
Check the connectors for improperly made ends, foil touching the copper coax line, loose connections, bad/old/cheap connectors, or corroded connections. Replace them if you do.
Be sure to power OFF the modem for 1 minute then back ON.
https://community.netgear.com/t5/Cable-Modems-Routers/General-info-and-Troubleshooting-for-Cable-Modems/m-p/1530376#M12853
https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router
https://www.duckware.com/tech/solving-intermittent-cable-modem-issues.html
https://highspeed.tips/docsis-events/
- jf6791
  Guide
  Dec 27, 2023
  Can I advise the ISP that any of the levels are out of spec?
  - FURRYe38
    Guru - Experienced User
    Dec 27, 2023
    Power levels are with in spec:
    
    https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router

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CM1200 Modem Log has same single entry all the time