Netgear CM1000v2 bandwidth dropoff with Gigabit xfinity service

Bandwidth drops with Gigabit service.

Modem: Netgear CM1000v2

Firmware: V7.01.01

Time	Priority	Description
2021-01-01, 20:27:22	Notice (6)	CM-STATUS message sent. Event Type Code: 22; Chan ID: 33; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=9c:c9:eb:92:0b:f0;CMTS-MAC=00:01:5c:76:2c:59;CM-QOS=1.1;CM-VER=3.1;
2021-01-01, 20:26:54	Notice (6)	CM-STATUS message sent. Event Type Code: 20; Chan ID: 33; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=9c:c9:eb:92:0b:f0;CMTS-MAC=00:01:5c:76:2c:59;CM-QOS=1.1;CM-VER=3.1;
2021-01-01, 20:26:36	Notice (6)	CM-STATUS message sent. Event Type Code: 22; Chan ID: 33; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=9c:c9:eb:92:0b:f0;CMTS-MAC=00:01:5c:76:2c:59;CM-QOS=1.1;CM-VER=3.1;
2021-01-01, 20:26:08	Notice (6)	CM-STATUS message sent. Event Type Code: 20; Chan ID: 33; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=9c:c9:eb:92:0b:f0;CMTS-MAC=00:01:5c:76:2c:59;CM-QOS=1.1;CM-VER=3.1;
2021-01-01, 20:25:21	Notice (6)	CM-STATUS message sent. Event Type Code: 22; Chan ID: 33; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=9c:c9:eb:92:0b:f0;CMTS-MAC=00:01:5c:76:2c:59;CM-QOS=1.1;CM-VER=3.1;
2021-01-01, 20:24:51	Notice (6)	CM-STATUS message sent. Event Type Code: 20; Chan ID: 33; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=9c:c9:eb:92:0b:f0;CMTS-MAC=00:01:5c:76:2c:59;CM-QOS=1.1;CM-VER=3.1;
2021-01-01, 20:23:58	Notice (6)	CM-STATUS message sent. Event Type Code: 22; Chan ID: 33; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=9c:c9:eb:92:0b:f0;CMTS-MAC=00:01:5c:76:2c:59;CM-QOS=1.1;CM-VER=3.1;
2021-01-01, 20:23:33	Notice (6)	CM-STATUS message sent. Event Type Code: 20; Chan ID: 33; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=9c:c9:eb:92:0b:f0;CMTS-MAC=00:01:5c:76:2c:59;CM-QOS=1.1;CM-VER=3.1;
2021-01-01, 20:23:17	Notice (6)	CM-STATUS message sent. Event Type Code: 22; Chan ID: 33; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=9c:c9:eb:92:0b:f0;CMTS-MAC=00:01:5c:76:2c:59;CM-QOS=1.1;CM-VER=3.1;
2021-01-01, 20:23:17	Notice (6)	CM-STATUS message sent. Event Type Code: 24; Chan ID: 33; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 1.;CM-MAC=9c:c9:eb:92:0b:f0;CMTS-MAC=00:01:5c:76:2c:59;CM-QOS=1.1;CM-VER=3.1;
2021-01-01, 20:22:49	Notice (6)	CM-STATUS message sent. Event Type Code: 20; Chan ID: 33; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=9c:c9:eb:92:0b:f0;CMTS-MAC=00:01:5c:76:2c:59;CM-QOS=1.1;CM-VER=3.1;
2021-01-01, 20:22:22	Notice (6)	CM-STATUS message sent. Event Type Code: 16; Chan ID: 33; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 1 2 3.;CM-MAC=9c:c9:eb:92:0b:f0;CMTS-MAC=00:01:5c:76:2c:59;CM-QOS=1.1;CM-VER=3.1;
2021-01-01, 20:22:11	Notice (6)	CM-STATUS message sent. Event Type Code: 22; Chan ID: 33; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=9c:c9:eb:92:0b:f0;CMTS-MAC=00:01:5c:76:2c:59;CM-QOS=1.1;CM-VER=3.1;
2021-01-01, 20:21:51	Notice (6)	CM-STATUS message sent. Event Type Code: 16; Chan ID: 33; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 2 3.;CM-MAC=9c:c9:eb:92:0b:f0;CMTS-MAC=00:01:5c:76:2c:59;CM-QOS=1.1;CM-VER=3.1;
2021-01-01, 20:21:46	Notice (6)	CM-STATUS message sent. Event Type Code: 20; Chan ID: 33; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=9c:c9:eb:92:0b:f0;CMTS-MAC=00:01:5c:76:2c:59;CM-QOS=1.1;CM-VER=3.1;
2021-01-01, 20:21:46	Notice (6)	CM-STATUS message sent. Event Type Code: 16; Chan ID: 33; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=9c:c9:eb:92:0b:f0;CMTS-MAC=00:01:5c:76:2c:59;CM-QOS=1.1;CM-VER=3.1;
2021-01-01, 20:21:36	Notice (6)	DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=9c:c9:eb:92:0b:f0;CMTS-MAC=00:01:5c:76:2c:59;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Notice (6)	Honoring MDD; IP provisioning mode = IPv6
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:92:0b:f0;CMTS-MAC=00:01:5c:76:2c:59;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:92:0b:f0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:92:0b:f0;CMTS-MAC=00:01:5c:76:2c:59;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:92:0b:f0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:92:0b:f0;CMTS-MAC=00:01:5c:76:2c:59;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:92:0b:f0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:92:0b:f0;CMTS-MAC=00:01:5c:76:2c:59;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:92:0b:f0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:92:0b:f0;CMTS-MAC=00:01:5c:76:2c:59;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:92:0b:f0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:92:0b:f0;CMTS-MAC=00:01:5c:76:2c:59;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:92:0b:f0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;

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Responses

CMCCR

New Poster

•

2 Messages

5 years ago

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	507000000 Hz	Locked
Connectivity State	OK	Operational
Boot State	OK	Operational
Security	Enable	BPI+
IP Provisioning Mode	Honor MDD	IPv6 only

Downstream Bonded Channels (Partial Service)

Channel	Lock Status	Modulation	Channel ID	Frequency	Power	SNR / MER	Unerrored Codewords	Correctable Codewords	Uncorrectable Codewords
1	Locked	QAM256	5	507000000 Hz	-7.6 dBmV	39.6 dB	44829677	12	0
2	Locked	QAM256	2	483000000 Hz	-7.9 dBmV	43.2 dB	43666606	5	0
3	Locked	QAM256	3	489000000 Hz	-8.0 dBmV	43.0 dB	43670361	6	0
4	Locked	QAM256	4	495000000 Hz	-8.6 dBmV	41.6 dB	43673963	13	0
5	Locked	QAM256	6	513000000 Hz	-7.6 dBmV	41.1 dB	43677592	6	0
6	Locked	QAM256	7	519000000 Hz	-8.1 dBmV	33.3 dB	43681061	17	0
7	Locked	QAM256	8	525000000 Hz	-8.0 dBmV	31.5 dB	43685278	20	0
8	Locked	QAM256	9	531000000 Hz	-7.7 dBmV	33.3 dB	43689278	6	0
9	Locked	QAM256	10	537000000 Hz	-8.0 dBmV	35.0 dB	43692560	6	0
10	Locked	QAM256	11	543000000 Hz	-8.2 dBmV	40.8 dB	43696505	3	0
11	Locked	QAM256	12	549000000 Hz	-8.4 dBmV	42.7 dB	43700125	7	0
12	Locked	QAM256	13	555000000 Hz	-8.2 dBmV	43.0 dB	43703840	5	0
13	Locked	QAM256	14	561000000 Hz	-8.5 dBmV	42.7 dB	43707805	4	0
14	Locked	QAM256	15	567000000 Hz	-8.4 dBmV	42.4 dB	43711631	3	0
15	Locked	QAM256	16	573000000 Hz	-9.0 dBmV	42.2 dB	43715205	8	0
16	Locked	QAM256	17	579000000 Hz	-8.9 dBmV	42.2 dB	43718826	5	0
17	Locked	QAM256	18	585000000 Hz	-8.8 dBmV	39.0 dB	43722455	7	0
18	Locked	QAM256	19	591000000 Hz	-9.3 dBmV	38.0 dB	43726544	10	0
19	Locked	QAM256	20	597000000 Hz	-9.2 dBmV	36.5 dB	43730085	6	0
20	Locked	QAM256	21	603000000 Hz	-9.1 dBmV	40.5 dB	43733815	7	0
21	Locked	QAM256	22	609000000 Hz	-8.3 dBmV	42.6 dB	43737660	9	0
22	Locked	QAM256	23	615000000 Hz	-9.5 dBmV	41.8 dB	43741302	6	0
23	Locked	QAM256	24	621000000 Hz	-9.6 dBmV	38.1 dB	43744632	379	0
24	Locked	QAM256	25	627000000 Hz	-8.9 dBmV	33.0 dB	43137466	606565	4877
25	Locked	QAM256	26	633000000 Hz	-9.5 dBmV	38.9 dB	43735632	17402	71
26	Locked	QAM256	27	639000000 Hz	-9.5 dBmV	39.8 dB	43527222	227254	2628
27	Locked	QAM256	28	645000000 Hz	-9.1 dBmV	32.1 dB	43596848	162913	690
28	Locked	QAM256	29	651000000 Hz	-8.4 dBmV	41.9 dB	43764249	7	0
29	Locked	QAM256	30	657000000 Hz	-9.7 dBmV	41.2 dB	43767959	6	0
30	Locked	QAM256	31	663000000 Hz	-10.0 dBmV	41.1 dB	43769119	14	0
31	Locked	QAM256	32	669000000 Hz	-10.1 dBmV	41.0 dB	43760840	1748	7283
32	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0	0

Upstream Bonded Channels

Channel	Lock Status	Modulation	Channel ID	Frequency	Power
1	Locked	ATDMA	1	35600000 Hz	51.8 dBmV
2	Locked	ATDMA	2	29200000 Hz	52.5 dBmV
3	Locked	ATDMA	3	22800000 Hz	52.3 dBmV
4	Locked	ATDMA	4	16400000 Hz	52.3 dBmV
5	Locked	ATDMA	5	40400000 Hz	50.5 dBmV
6	Not Locked	Unknown	0	0 Hz	0.0 dBmV
7	Not Locked	Unknown	0	0 Hz	0.0 dBmV
8	Not Locked	Unknown	0	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	33	722000000 Hz	-8.6 dBmV	26.5 dB	1228 ~ 2867	1682920	1602721	77795
2	Not Locked	0	0	0 Hz	-8.7 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	Unknown	0	0 Hz	0 dBmV
2	Not Locked	Unknown	0	0 Hz	0 dBmV

Current System Time: Fri Jan 01 20:37:40 2021System Up Time: 0:16:48

EG

Expert

•

111.5K Messages

5 years ago

Oth the upstream power and the downstream power are borderline and they may be intermittently fluctuating even farther to out of spec levels. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.

In a self troubleshooting effort to try to obtain better connectivity / more wiggle room, check to see if there are there 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 types like GE, RadioShack, RCA, Philips, Leviton, Magnavox, and Rocketfish from big box stores like Home Depot, Lowes, Target, Wal-Mart etc. Splitters should be swapped with known to be good / new ones to test

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.

Your Home Network

CMCCR

Netgear CM1000v2 bandwidth dropoff with Gigabit xfinity service

CMCCR

EG

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