CM1000 Capped at 400megabit Comcast Gig speed

[TurretGaming]

I spent 2 hours on the phone with some "tech" saying its my modem thats the problem or its my wiring and i know for a fact hes wrong. All wires in my home are cat6a and the cox cables are brand new. I had full 900ish mega down and 40 up for a bit but then it started to slow. I still get full 40 up but my down speed was about 100-300 on so many sites. literaly every site said the same thing, exept comcasts own site which said i was getting 900 down and 40 up. The guy on the phone insists that my modem is broken and I need to RMA it with Netgear. Well to this day (all most 2 months later) its still slow and when i had it looked at i was told that it was perfect. So can someone help me figure this out. is it comcast or do i have a bad modem.

Time	Priority	Description
2018-04-19, 17:50:12	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=b0:39:56:4a:d5:f0;CMTS-MAC=58:97:bd:2e:4d:60;CM-QOS=1.1;CM-VER=3.1;
2018-04-19, 17:50:11	Warning (5)	Unicast DSID PSN startup error
2018-04-19, 17:49:55	Warning (5)	REG-RSP-MP Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;CM-MAC=b0:39:56:4a:d5:f0;CMTS-MAC=58:97:bd:2e:4d:60;CM-QOS=1.1;CM-VER=3.1;
2018-04-19, 17:49:49	Notice (6)	DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 .;CM-MAC=b0:39:56:4a:d5:f0;CMTS-MAC=58:97:bd:2e:4d:60;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Notice (6)	Honoring MDD; IP provisioning mode = IPv6
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=b0:39:56:4a:d5:f0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2018-04-14, 20:07:11	Critical (3)	Resetting the cable modem due to docsDevResetNow
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=b0:39:56:4a:d5:f0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2018-03-08, 07:27:03	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 2;CM-MAC=b0:39:56:4a:d5:f0;CMTS-MAC=58:97:bd:2e:4d:60;CM-QOS=1.1;CM-VER=3.1;
2018-03-08, 07:27:03	Critical (3)	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=b0:39:56:4a:d5:f0;CMTS-MAC=58:97:bd:2e:4d:60;CM-QOS=1.1;CM-VER=3.1;
2018-03-08, 07:25:43	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=b0:39:56:4a:d5:f0;CMTS-MAC=58:97:bd:2e:4d:60;CM-QOS=1.1;CM-VER=3.1;
2018-03-08, 07:25:23	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 1;CM-MAC=b0:39:56:4a:d5:f0;CMTS-MAC=58:97:bd:2e:4d:60;CM-QOS=1.1;CM-VER=3.1;
2018-03-08, 07:25:23	Critical (3)	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=b0:39:56:4a:d5:f0;CMTS-MAC=58:97:bd:2e:4d:60;CM-QOS=1.1;CM-VER=3.1;
2018-03-08, 07:24:03	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=b0:39:56:4a:d5:f0;CMTS-MAC=58:97:bd:2e:4d:60;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=b0:39:56:4a:d5: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=b0:39:56:4a:d5:f0;CMTS-MAC=58:97:bd:2e:4d:60;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=b0:39:56:4a:d5:f0;CMTS-MAC=00:00:00:00:00:00;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=b0:39:56:4a:d5:f0;CMTS-MAC=00:00:00:00:00:00;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=b0:39:56:4a:d5:f0;CMTS-MAC=00:00:00:00:00:00;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=b0:39:56:4a:d5:f0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=b0:39:56:4a:d5:f0;CMTS-MAC=00:00:00:00:00:00;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=b0:39:56:4a:d5:f0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=b0:39:56:4a:d5:f0;CMTS-MAC=00:00:00:00:00:00;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=b0:39:56:4a:d5:f0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=b0:39:56:4a:d5:f0;CMTS-MAC=00:00:00:00:00:00;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=b0:39:56:4a:d5:f0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=b0:39:56:4a:d5:f0;CMTS-MAC=00:00:00:00:00:00;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=b0:39:56:4a:d5:f0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=b0:39:56:4a:d5:f0;CMTS-MAC=00:00:00:00:00:00;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=b0:39:56:4a:d5:f0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=b0:39:56:4a:d5:f0;CMTS-MAC=00:00:00:00:00:00;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=b0:39:56:4a:d5:f0;CMTS-MAC=00:00:00:00:00:00;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=b0:39:56:4a:d5:f0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;

[DarrenM]

Are you able to post your power levels and the uncorrectables?

DarrenM

[TurretGaming]

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

<tabindex=-1>Startup Procedure

Procedure Status Comment Acquire Downstream Channel 639000000 Hz Locked Connectivity State OK Operational Boot State OK Operational Security Enable BPI+ IP Provisioning Mode Honor MDD IPv6 only

<tabindex=-1>Downstream Bonded Channels

Channel Lock Status Modulation Channel ID Frequency Power SNR / MER Unerrored Codewords Correctable Codewords Uncorrectable Codewords 1 Locked QAM256 21 639000000 Hz -6.1 dBmV 40.0 dB 504028738 0 0 2 Locked QAM256 1 519000000 Hz -4.0 dBmV 41.4 dB 502641181 0 0 3 Locked QAM256 2 525000000 Hz -4.2 dBmV 41.3 dB 502650682 0 0 4 Locked QAM256 3 531000000 Hz -4.6 dBmV 41.4 dB 502649545 0 0 5 Locked QAM256 4 537000000 Hz -4.8 dBmV 41.2 dB 502669202 0 0 6 Locked QAM256 5 543000000 Hz -5.0 dBmV 41.0 dB 502677983 0 0 7 Locked QAM256 6 549000000 Hz -4.8 dBmV 41.1 dB 502687773 0 0 8 Locked QAM256 7 555000000 Hz -5.0 dBmV 41.0 dB 502696674 0 0 9 Locked QAM256 8 561000000 Hz -4.9 dBmV 41.1 dB 502716835 0 0 10 Locked QAM256 9 567000000 Hz -5.1 dBmV 40.9 dB 502726632 0 0 11 Locked QAM256 10 573000000 Hz -5.1 dBmV 40.9 dB 502735461 0 0 12 Locked QAM256 11 579000000 Hz -5.3 dBmV 40.6 dB 502744732 0 0 13 Locked QAM256 12 585000000 Hz -5.3 dBmV 40.6 dB 502754249 0 0 14 Locked QAM256 13 591000000 Hz -5.1 dBmV 40.8 dB 502763362 0 0 15 Locked QAM256 14 597000000 Hz -5.7 dBmV 40.5 dB 502781675 0 0 16 Locked QAM256 15 603000000 Hz -5.3 dBmV 40.6 dB 502790966 0 0 17 Locked QAM256 16 609000000 Hz -5.5 dBmV 40.4 dB 502811206 0 0 18 Locked QAM256 17 615000000 Hz -5.4 dBmV 40.6 dB 502820322 0 0 19 Locked QAM256 18 621000000 Hz -6.0 dBmV 40.1 dB 502829755 0 0 20 Locked QAM256 19 627000000 Hz -6.1 dBmV 40.2 dB 502838724 0 0 21 Locked QAM256 20 633000000 Hz -5.9 dBmV 40.1 dB 502848133 0 0 22 Locked QAM256 22 645000000 Hz -6.5 dBmV 39.6 dB 502857470 0 0 23 Locked QAM256 23 651000000 Hz -6.4 dBmV 39.5 dB 502875610 0 0 24 Locked QAM256 24 657000000 Hz -7.2 dBmV 39.1 dB 502870566 0 0 25 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 0 26 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 0 27 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 0 28 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 0 29 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 0 30 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 0 31 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 0 32 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 0

<tabindex=-1>Upstream Bonded Channels

Channel Lock Status Modulation Channel ID Frequency Power 1 Locked ATDMA 1 36500000 Hz 44.0 dBmV 2 Locked ATDMA 2 30100000 Hz 44.0 dBmV 3 Locked ATDMA 3 23700000 Hz 43.5 dBmV 4 Locked ATDMA 4 17300000 Hz 43.5 dBmV 5 Not Locked Unknown 0 0 Hz 0.0 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

<tabindex=-1>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, 1 159 702000000 Hz -5.7 dBmV 38.3 dB 1126 ~ 2969 428831039 6793 1 2 Not Locked 0 0 0 Hz -1.7 dBmV 0.0 dB 0 ~ 4095 0 0 0

<tabindex=-1>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

[DarrenM]

That is odd you are getting no readings on the Upstream power levels. Also the uncorrectables is cut off in the picture do you see large numbers in this area?

DarrenM

[TurretGaming]

This is all that is on that page. Comcast controls the updates and boot files aparently also the event log is clear of anything. All that I just posted is all that I seel.

Apply             Cancel     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 <tabindex=-1>Startup Procedure Procedure Status Comment Acquire Downstream Channel 639000000 Hz Locked Connectivity State OK Operational Boot State OK Operational Security Enable BPI+ IP Provisioning Mode Honor MDD IPv6 only <tabindex=-1>Downstream Bonded Channels Channel Lock Status Modulation Channel ID Frequency Power SNR / MER Unerrored Codewords Correctable Codewords Uncorrectable Codewords 1 Locked QAM256 21 639000000 Hz -6.8 dBmV 39.9 dB 3428725165 0 0 2 Locked QAM256 1 519000000 Hz -4.5 dBmV 41.5 dB 3427437059 0 0 3 Locked QAM256 2 525000000 Hz -4.8 dBmV 41.5 dB 3427445740 0 0 4 Locked QAM256 3 531000000 Hz -5.1 dBmV 41.4 dB 3427445293 0 0 5 Locked QAM256 4 537000000 Hz -5.3 dBmV 41.2 dB 3427464622 0 0 6 Locked QAM256 5 543000000 Hz -5.5 dBmV 41.1 dB 3427473790 0 0 7 Locked QAM256 6 549000000 Hz -5.3 dBmV 41.2 dB 3427483200 0 0 8 Locked QAM256 7 555000000 Hz -5.5 dBmV 41.1 dB 3427492220 0 0 9 Locked QAM256 8 561000000 Hz -5.4 dBmV 41.1 dB 3427541585 0 0 10 Locked QAM256 9 567000000 Hz -5.7 dBmV 40.9 dB 3427551286 0 0 11 Locked QAM256 10 573000000 Hz -5.6 dBmV 40.9 dB 3427560274 0 0 12 Locked QAM256 11 579000000 Hz -5.9 dBmV 40.7 dB 3427569778 0 0 13 Locked QAM256 12 585000000 Hz -6.0 dBmV 40.7 dB 3427579246 0 0 14 Locked QAM256 13 591000000 Hz -5.9 dBmV 40.7 dB 3427588790 0 0 15 Locked QAM256 14 597000000 Hz -6.4 dBmV 40.4 dB 3427597530 0 0 16 Locked QAM256 15 603000000 Hz -6.3 dBmV 40.4 dB 3427607258 0 0 17 Locked QAM256 16 609000000 Hz -6.6 dBmV 40.1 dB 3427660318 0 0 18 Locked QAM256 17 615000000 Hz -6.4 dBmV 40.3 dB 3427678864 0 0 19 Locked QAM256 18 621000000 Hz -7.0 dBmV 40.0 dB 3427688095 0 0 20 Locked QAM256 19 627000000 Hz -6.7 dBmV 40.1 dB 3427697076 0 0 21 Locked QAM256 20 633000000 Hz -6.6 dBmV 40.2 dB 3427705472 0 0 22 Locked QAM256 22 645000000 Hz -7.2 dBmV 39.5 dB 3427714803 0 0 23 Locked QAM256 23 651000000 Hz -6.8 dBmV 39.4 dB 3427733260 0 0 24 Locked QAM256 24 657000000 Hz -7.5 dBmV 39.3 dB 3427728548 0 0 25 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 0 26 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 0 27 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 0 28 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 0 29 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 0 30 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 0 31 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 0 32 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 0 <tabindex=-1>Upstream Bonded Channels Channel Lock Status Modulation Channel ID Frequency Power 1 Locked ATDMA 1 36500000 Hz 45.0 dBmV 2 Locked ATDMA 2 30100000 Hz 45.0 dBmV 3 Locked ATDMA 3 23700000 Hz 44.0 dBmV 4 Locked ATDMA 4 17300000 Hz 44.5 dBmV 5 Not Locked Unknown 0 0 Hz 0.0 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 <tabindex=-1>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, 1 159 702000000 Hz -6.0 dBmV 38.3 dB 1126 ~ 2969 2924879599 26384 1 2 Not Locked 0 0 0 Hz -1.9 dBmV 0.0 dB 0 ~ 4095 0 0 0 <tabindex=-1>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: Thu Apr 26 11:56:36 2018

[TurretGaming]

All the things I've posted so far is all that i see.

[TurretGaming]

Sir? What do you make of the data I've posted so far?

[DarrenM]

At this point you may need a ISP tech out to check the connections out side the house could be something bad in box out on the street.

DarrenM

[Mrgoodall]

See those unlocked channels? they should be locked. All those sync timing issues? You need a line tech to look at that. If a tech worth their salt comes out and does a line test, no way in hell, its gonna pass. They'll tell you flat out they need someone to come to take a look at the line.

[TurretGaming]

I've contacted Comcast about this and they came and relpaced the coax fittings in my home. Either way the lines coming from the street have yet to be addressed but I'm expecting them to replace them soon. I'll either notice right way with the proper speeds or I will end up calling them again in a week or so asking if its been done. 

I'm also posting all my data for over a year with graphs and other things over at: https://linustechtips.com/main/topic/925281-slow-gig-speed/   so I recommend you take a look.