Forum Discussion

Aspirant

Aug 18, 2023

Solved

Upstream Light on CM2000 Blinks Constantly

Just installed new CM2000 to replace an old CM1000. The installation through Xfinity went smoothly except for the fact that the Upstream light is constantly blinking. The old CM1000 never did this. T...

Troubleshooting

brmoore9
Aug 26, 2023
Just to let everyone know Xfinity tech came to house today and determined that the outside cable (been in the ground for 18 years) was damaged and replaced the cable. This resolved the issue as internet now works properly.

FURRYe38

Guru - Experienced User

Aug 18, 2023

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

brmoore9

Aspirant

Aug 18, 2023

Cable Diagnostic
Status: Poor
Action: [Partial Service] If the Partial Service mode does not go away within a few hours (Click the Refresh button after each step): 1) Make sure the coaxial cable is tightly connected. 2) Remove any unnecessary splitters. 3) Replace any required ones. 4) Contact your service provider for troubleshooting help. [Upstream Power Level] Try these actions (Click the Refresh button after each step): 1) Make sure the coaxial cable is tightly connected. 2) Remove any unnecessary splitters. 3) Replace any required splitters. 4) Contact your service provider for troubleshooting help.
CM Status:
Downstream Status:
Upstream Status:
	Refresh Save Cable Diagnostic Info

Advanced Information

Frequency Start Value

This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect.

Starting Frequency

Startup Procedure

Procedure	Status	Comment
Acquire Downstream Channel	621000000 Hz	Locked
Connectivity State	OK	Operational
Boot State	OK	Operational
Security	Enabled	BPI+
IP Provisioning Mode	Honor MDD	IPv6 only

Downstream Bonded Channels

Channel	Lock Status	Modulation	Channel ID	Frequency	Power	SNR	Correctables	Uncorrectables
1	Locked	QAM256	21	621000000 Hz	-1.3 dBmV	41.2 dB	0	0
2	Locked	QAM256	6	531000000 Hz	-0.6 dBmV	41.8 dB	0	0
3	Locked	QAM256	7	537000000 Hz	-0.7 dBmV	41.7 dB	0	0
4	Locked	QAM256	8	543000000 Hz	-0.5 dBmV	41.8 dB	0	0
5	Locked	QAM256	9	549000000 Hz	-0.5 dBmV	41.7 dB	0	0
6	Locked	QAM256	10	555000000 Hz	-0.8 dBmV	41.6 dB	0	0
7	Locked	QAM256	11	561000000 Hz	-0.9 dBmV	41.5 dB	0	0
8	Locked	QAM256	12	567000000 Hz	-1.1 dBmV	41.5 dB	0	0
9	Locked	QAM256	13	573000000 Hz	-1.0 dBmV	41.5 dB	0	0
10	Locked	QAM256	14	579000000 Hz	-0.9 dBmV	41.5 dB	0	0
11	Locked	QAM256	15	585000000 Hz	-1.0 dBmV	41.4 dB	0	0
12	Locked	QAM256	16	591000000 Hz	-1.1 dBmV	41.3 dB	0	0
13	Locked	QAM256	17	597000000 Hz	-1.1 dBmV	41.4 dB	0	0
14	Locked	QAM256	18	603000000 Hz	-1.0 dBmV	41.5 dB	0	0
15	Locked	QAM256	19	609000000 Hz	-0.9 dBmV	41.6 dB	0	0
16	Locked	QAM256	20	615000000 Hz	-1.1 dBmV	41.3 dB	0	0
17	Locked	QAM256	22	627000000 Hz	-1.6 dBmV	40.9 dB	0	0
18	Locked	QAM256	23	633000000 Hz	-1.8 dBmV	40.8 dB	0	0
19	Locked	QAM256	24	639000000 Hz	-1.9 dBmV	40.8 dB	0	0
20	Locked	QAM256	25	645000000 Hz	-1.8 dBmV	40.8 dB	0	0
21	Locked	QAM256	26	651000000 Hz	-1.7 dBmV	40.9 dB	0	0
22	Locked	QAM256	27	657000000 Hz	-1.9 dBmV	40.8 dB	0	0
23	Locked	QAM256	28	663000000 Hz	-2.3 dBmV	40.4 dB	0	0
24	Locked	QAM256	29	669000000 Hz	-2.4 dBmV	40.3 dB	0	0
25	Locked	QAM256	30	675000000 Hz	-2.2 dBmV	39.3 dB	0	0
26	Locked	QAM256	31	681000000 Hz	-2.0 dBmV	40.7 dB	0	0
27	Locked	QAM256	33	687000000 Hz	-1.7 dBmV	40.8 dB	0	0
28	Locked	QAM256	34	693000000 Hz	-2.0 dBmV	40.6 dB	0	0
29	Locked	QAM256	35	699000000 Hz	-2.2 dBmV	40.3 dB	0	0
30	Locked	QAM256	36	705000000 Hz	-2.5 dBmV	40.2 dB	0	0
31	Locked	QAM256	37	711000000 Hz	-2.3 dBmV	40.2 dB	0	0
32	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0

Upstream Bonded Channels (Partial Service)

Channel	Lock Status	US Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	1	5120 Ksym/sec	35600000 Hz	58.0 dBmV
2	Not Locked	Unknown	0	0	0	0.0 dBmV
3	Not Locked	Unknown	0	0	0	0.0 dBmV
4	Not Locked	Unknown	0	0	0	0.0 dBmV
5	Locked	ATDMA	5	2560 Ksym/sec	40400000 Hz	55.5 dBmV
6	Not Locked	Unknown	0	0	0	0.0 dBmV
7	Not Locked	Unknown	0	0	0	0.0 dBmV
8	Not Locked	Unknown	0	0	0	0.0 dBmV

Downstream OFDM Channels

Channel	Lock Status	Profile ID	Channel ID	Frequency	Power	SNR / MER	Active Subcarrier Number Range	Unerrored Codewords	Correctable Codewords	Uncorrectable Codewords
1	Locked	0 ,1 ,2 ,3	32	762000000 Hz	-1.72 dBmV	39.8 dB	1108 ~ 2987	10275805	10078087	0
2	Not Locked	0	0	0 Hz	0 dBmV	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 PowerEnable Extended Upstream Transmit Power

Current System Time:Fri Aug 18 13:19:31 2023System Up Time:00:15:54

FURRYe38

Guru - Experienced User

Aug 18, 2023

Well power levels are with in spec:

https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router

No correctables or un-correctables which is good.

Status shows poor though...Lets see the Events log please.

brmoore9

Aspirant

Aug 20, 2023

Sorry it took so long to reply back. Here is the most recent event log.

Clear Log Refresh Export

Time	Priority	Description
Sun Aug 20 13:58:57 2023	(Critical (3))	No Ranging Response received - T3 time-out;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:58:47 2023	(Critical (3))	16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:58:47 2023	(Critical (3))	Ranging Request Retries exhausted;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:58:47 2023	(Critical (3))	No Ranging Response received - T3 time-out;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:58:08 2023	(Critical (3))	16 consecutive T3 timeouts while trying to range on upstream channel 2;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:58:08 2023	(Critical (3))	Ranging Request Retries exhausted;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:58:08 2023	(Critical (3))	No Ranging Response received - T3 time-out;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:55:52 2023	(Critical (3))	16 consecutive T3 timeouts while trying to range on upstream channel 4;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:55:52 2023	(Critical (3))	Ranging Request Retries exhausted;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:55:52 2023	(Critical (3))	No Ranging Response received - T3 time-out;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:54:34 2023	(Critical (3))	16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:54:34 2023	(Critical (3))	Ranging Request Retries exhausted;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:54:34 2023	(Critical (3))	No Ranging Response received - T3 time-out;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:51:14 2023	(Critical (3))	16 consecutive T3 timeouts while trying to range on upstream channel 2;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:51:14 2023	(Critical (3))	Ranging Request Retries exhausted;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:51:14 2023	(Critical (3))	No Ranging Response received - T3 time-out;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:49:43 2023	(Critical (3))	16 consecutive T3 timeouts while trying to range on upstream channel 4;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:49:43 2023	(Critical (3))	Ranging Request Retries exhausted;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:49:43 2023	(Critical (3))	No Ranging Response received - T3 time-out;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:49:05 2023	(Critical (3))	16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:49:05 2023	(Critical (3))	Ranging Request Retries exhausted;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:49:05 2023	(Critical (3))	No Ranging Response received - T3 time-out;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:45:40 2023	(Critical (3))	16 consecutive T3 timeouts while trying to range on upstream channel 2;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:45:40 2023	(Critical (3))	Ranging Request Retries exhausted;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:45:40 2023	(Critical (3))	No Ranging Response received - T3 time-out;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:42:58 2023	(Critical (3))	16 consecutive T3 timeouts while trying to range on upstream channel 4;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:42:58 2023	(Critical (3))	Ranging Request Retries exhausted;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:42:58 2023	(Critical (3))	No Ranging Response received - T3 time-out;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:42:40 2023	(Critical (3))	16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:42:40 2023	(Critical (3))	Ranging Request Retries exhausted;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:42:40 2023	(Critical (3))	No Ranging Response received - T3 time-out;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:40:38 2023	(Critical (3))	16 consecutive T3 timeouts while trying to range on upstream channel 2;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:40:38 2023	(Critical (3))	Ranging Request Retries exhausted;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:40:38 2023	(Critical (3))	No Ranging Response received - T3 time-out;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:37:10 2023	(Critical (3))	16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:37:10 2023	(Critical (3))	Ranging Request Retries exhausted;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:37:10 2023	(Critical (3))	No Ranging Response received - T3 time-out;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:36:36 2023	(Critical (3))	16 consecutive T3 timeouts while trying to range on upstream channel 4;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:36:36 2023	(Critical (3))	Ranging Request Retries exhausted;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;
Sun Aug 20 13:36:36 2023	(Critical (3))	No Ranging Response received - T3 time-out;CM-MAC=94:18:65:2c:16:13;CMTS-MAC=00:01:5c:70:14:a2;CM-QOS=1.1;CM-VER=3.1;

FURRYe38
Guru - Experienced User
Aug 21, 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.