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Forum Discussion
Help needed please CM1200 slowdown
Charter Spectrum Internet Ultra 400 Mbps
was running a CM500 that had my internet running above the 400 Mbps
Modem:
Nighthawk CM1200
Version: V2.02.05
Ethernet Port Aggregation Status: Inactive
Router:
Linksys Max Stream AX6000 Dual-Band Mesh Wi-Fi Router
MR9600
Speed Tests
Linksys app (Phone wi-fi)
Ping 8 ms
Download 458 Mbps
Upload 23 Mbps
Ookla through phone Wi-Fi
Ping 17 ms
Download 325.95 Mbps
Upload not tested
Ookla through laptop Wi-Fi
Ping 11 ms
Download 90.07 Mbps
Upload 22.93 Mbps
Xbox Series X network statistics test (Wired)
Latency 51 ms (was much faster on DSL consistently under 30 ms)
Download 90.96 Mbps
Upload 22.48 Mbps
Packet loss 0%
MTU 1480
Thank you for any help regarding how to diagnose and fix the speed issue
10 Replies
Startup Procedure
Procedure Status Comment
Acquire Downstream Channel 326000000 Hz Locked
Connectivity State OK Operational
Boot State OK Operational
Security Enabled BPI+
IP Provisioning Mode IPv4 Only ipv4Only(0)
Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables
1 Locked QAM256 1 603000000 Hz 1.6 dBmV 41.1 dB 0 0
2 Locked QAM256 2 609000000 Hz 1.7 dBmV 41.2 dB 0 0
3 Locked QAM256 3 615000000 Hz 1.7 dBmV 41.1 dB 0 0
4 Locked QAM256 4 621000000 Hz 1.8 dBmV 41.1 dB 0 0
5 Locked QAM256 5 627000000 Hz 1.7 dBmV 41 dB 0 0
6 Locked QAM256 6 633000000 Hz 1.8 dBmV 41.1 dB 0 0
7 Locked QAM256 7 639000000 Hz 2.1 dBmV 41 dB 0 0
8 Locked QAM256 8 645000000 Hz 2.1 dBmV 41 dB 0 0
9 Locked QAM256 9 651000000 Hz 2 dBmV 40.9 dB 0 0
10 Locked QAM256 10 657000000 Hz 1.7 dBmV 40.9 dB 0 0
11 Locked QAM256 11 663000000 Hz 1.8 dBmV 41 dB 0 0
12 Locked QAM256 12 669000000 Hz 1.8 dBmV 40.9 dB 0 0
13 Locked QAM256 13 675000000 Hz 1.9 dBmV 40.4 dB 0 0
14 Locked QAM256 14 681000000 Hz 1.9 dBmV 40.8 dB 0 0
15 Locked QAM256 15 687000000 Hz 2.1 dBmV 40.8 dB 0 0
16 Locked QAM256 16 693000000 Hz 2.2 dBmV 40.9 dB 0 0
17 Locked QAM256 17 699000000 Hz 2.2 dBmV 40.8 dB 0 0
18 Locked QAM256 18 705000000 Hz 2.4 dBmV 40.8 dB 0 0
19 Locked QAM256 19 711000000 Hz 2.4 dBmV 40.8 dB 0 0
20 Locked QAM256 20 717000000 Hz 2.5 dBmV 40.8 dB 0 0
21 Locked QAM256 21 723000000 Hz 2.1 dBmV 40.5 dB 0 0
22 Locked QAM256 22 729000000 Hz 1.9 dBmV 40.4 dB 0 0
23 Locked QAM256 23 735000000 Hz 1.9 dBmV 40.4 dB 0 0
24 Locked QAM256 24 741000000 Hz 2.1 dBmV 40.5 dB 0 0
25 Locked QAM256 26 747000000 Hz 2.2 dBmV 40.4 dB 0 0
26 Locked QAM256 27 753000000 Hz 2.1 dBmV 40.3 dB 2 0
27 Locked QAM256 28 759000000 Hz 1.9 dBmV 40.3 dB 1 0
28 Locked QAM256 29 765000000 Hz 1.9 dBmV 40.2 dB 2 0
29 Locked QAM256 30 771000000 Hz 1.9 dBmV 40.1 dB 1 0
30 Locked QAM256 31 777000000 Hz 2 dBmV 40.2 dB 4 0
31 Locked QAM256 32 783000000 Hz 1.6 dBmV 39.9 dB 6 0
32 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 25 5120 Ksym/sec 17800000 Hz 46.5 dBmV
2 Locked ATDMA 26 5120 Ksym/sec 24200000 Hz 47.5 dBmV
3 Locked ATDMA 27 5120 Ksym/sec 30600000 Hz 47.8 dBmV
4 Locked ATDMA 28 5120 Ksym/sec 37000000 Hz 48.5 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 25 326000000 Hz 0.2 dBmV 42.0 dB 1108 ~ 2987 172541556 138706402 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:Sat Jan 16 01:00:12 2021
System Up Time:03:38:44What speed do you get with a pc/laptop directly connected to the modem?
Your results were indicating you were going through the router. And the router could be the issue and not the modem.
Especially since you're speeds directly off the linksys were hitting full speeds.
And you power levels look good on the modem (you didn't include the logs)
Fri Jan 15 21:22:01 2021 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2.;CM-MAC=08:36:c9:a4:0a:c8;CMTS-MAC=00:01:5c:66:c6:61;CM-QOS=1.1;CM-VER=3.1;
Fri Jan 15 21:21:56 2021 Notice (6) TLV-11 - unrecognized OID;CM-MAC=08:36:c9:a4:0a:c8;CMTS-MAC=00:01:5c:66:c6:61;CM-QOS=1.1;CM-VER=3.1;
Fri Jan 15 21:21:56 2021 Error (4) Missing BP Configuration Setting TLV Type: 17.9;CM-MAC=08:36:c9:a4:0a:c8;CMTS-MAC=00:01:5c:66:c6:61;CM-QOS=1.1;CM-VER=3.1;
Fri Jan 15 21:21:56 2021 Error (4) Missing BP Configuration Setting TLV Type: 17.8;CM-MAC=08:36:c9:a4:0a:c8;CMTS-MAC=00:01:5c:66:c6:61;CM-QOS=1.1;CM-VER=3.1;
Fri Jan 15 21:21:56 2021 Error (4) Missing BP Configuration Setting TLV Type: 17.3;CM-MAC=08:36:c9:a4:0a:c8;CMTS-MAC=00:01:5c:66:c6:61;CM-QOS=1.1;CM-VER=3.1;
Fri Jan 15 21:21:56 2021 Warning (5) DHCP WARNING - Non-critical field invalid in response ;CM-MAC=08:36:c9:a4:0a:c8;CMTS-MAC=00:01:5c:66:c6:61;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Notice (6) Overriding MDD IP initialization parameters; IP provisioning mode = IPv4
Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=08:36:c9:a4:0a:c8;CMTS-MAC=00:01:5c:66:c6:61;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=08:36:c9:a4:0a:c8;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Fri Jan 15 21:17:36 2021 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2.;CM-MAC=08:36:c9:a4:0a:c8;CMTS-MAC=00:01:5c:66:c6:61;CM-QOS=1.1;CM-VER=3.1;
Fri Jan 15 21:17:31 2021 Notice (6) TLV-11 - unrecognized OID;CM-MAC=08:36:c9:a4:0a:c8;CMTS-MAC=00:01:5c:66:c6:61;CM-QOS=1.1;CM-VER=3.1;
Fri Jan 15 21:17:31 2021 Error (4) Missing BP Configuration Setting TLV Type: 17.9;CM-MAC=08:36:c9:a4:0a:c8;CMTS-MAC=00:01:5c:66:c6:61;CM-QOS=1.1;CM-VER=3.1;
Fri Jan 15 21:17:31 2021 Error (4) Missing BP Configuration Setting TLV Type: 17.8;CM-MAC=08:36:c9:a4:0a:c8;CMTS-MAC=00:01:5c:66:c6:61;CM-QOS=1.1;CM-VER=3.1;
Fri Jan 15 21:17:31 2021 Error (4) Missing BP Configuration Setting TLV Type: 17.3;CM-MAC=08:36:c9:a4:0a:c8;CMTS-MAC=00:01:5c:66:c6:61;CM-QOS=1.1;CM-VER=3.1;
Fri Jan 15 21:17:31 2021 Warning (5) DHCP WARNING - Non-critical field invalid in response ;CM-MAC=08:36:c9:a4:0a:c8;CMTS-MAC=00:01:5c:66:c6:61;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Notice (6) Overriding MDD IP initialization parameters; IP provisioning mode = IPv4
Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=08:36:c9:a4:0a:c8;CMTS-MAC=00:01:5c:66:c6:61;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=08:36:c9:a4:0a:c8;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Thu Jan 14 21:25:59 2021 Error (4) DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=08:36:c9:a4:0a:c8;CMTS-MAC=00:01:5c:66:c6:61;CM-QOS=1.1;CM-VER=3.1;
Tue Jan 12 19:43:30 2021 Notice (6) CM-STATUS message sent. Event Type Code: 24; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 1 2.;CM-MAC=08:36:c9:a4:0a:c8;CMTS-MAC=00:01:5c:66:c6:61;CM-QOS=1.1;CM-VER=3.1;
Tue Jan 12 19:42:52 2021 Notice (6) CM-STATUS message sent. Event Type Code: 24; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 1.;CM-MAC=08:36:c9:a4:0a:c8;CMTS-MAC=00:01:5c:66:c6:61;CM-QOS=1.1;CM-VER=3.1;
