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About kvjkhjkhdfghjdf
since
02-17-2009
05-22-2020
kvjkhjkhdfghjdf
Frequent Visitor
6
Posts
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1
Solution
05-22-2020
10:20 AM
Well, tried comcast phone support with no result other than hearing the script, so did more debugging by reading lots of posts for CM1000 users seeing what their levels were before/after issues, developed a list of things to check, etc.
Rehung 70' coax run in basement to move 12"+ away from AC power lines, removed 'Y' splitter that splits TV/Modem to boost signal a bit and turned off all options on linksys router to strip/simplify everything. Performace went from 200mbps to 385mbps which is a little higher than advertised plan speed. Success.
Case closed for now. Thanks to all who helped and answered PMs regarding their case as it helped me move forward with debugging.
... View more
05-18-2020
11:12 PM
spongebob - I have a CM1000V2 that I just bought and I'm getting 2/3 of my plan speed. Getting 200 mbps downstream. My OFDM SNR is 30-31. Would you mind sharing your basic/cable-connection pages with levels so I can see what your SNR and power levels are as comparison?? I suspect my downstream OFDM signal/noise ratio is too low. Here are mine:
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</tabindex=-1>
Procedure
Status
Comment
Acquire Downstream Channel
579000000 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</tabindex=-1>
Channel
Lock Status
Modulation
Channel ID
Frequency
Power
SNR / MER
Unerrored Codewords
Correctable Codewords
Uncorrectable Codewords
1
Locked
QAM256
13
579000000 Hz
0.9 dBmV
38.0 dB
935278271
0
0
2
Locked
QAM256
10
561000000 Hz
1.4 dBmV
38.2 dB
934374163
0
0
3
Locked
QAM256
11
567000000 Hz
1.3 dBmV
38.1 dB
934378985
0
0
4
Locked
QAM256
12
573000000 Hz
1.3 dBmV
38.1 dB
934392638
0
0
5
Locked
QAM256
14
585000000 Hz
1.0 dBmV
37.9 dB
934396965
0
0
6
Locked
QAM256
15
591000000 Hz
0.9 dBmV
38.0 dB
934400171
0
0
7
Locked
QAM256
16
597000000 Hz
0.3 dBmV
37.7 dB
934403492
0
0
8
Locked
QAM256
17
603000000 Hz
-0.1 dBmV
37.6 dB
934408529
0
0
9
Locked
QAM256
18
609000000 Hz
-0.4 dBmV
37.3 dB
934418548
0
0
10
Locked
QAM256
19
633000000 Hz
1.0 dBmV
37.2 dB
934422572
13
19
11
Locked
QAM256
20
615000000 Hz
-0.5 dBmV
37.2 dB
934427824
0
0
12
Locked
QAM256
21
621000000 Hz
-0.2 dBmV
37.2 dB
934430138
0
0
13
Locked
QAM256
22
627000000 Hz
1.0 dBmV
37.4 dB
934433982
0
0
14
Locked
QAM256
23
639000000 Hz
1.7 dBmV
37.3 dB
934416907
3
31
15
Locked
QAM256
24
645000000 Hz
1.0 dBmV
37.1 dB
934416298
6
28
16
Locked
QAM256
26
651000000 Hz
0.9 dBmV
36.9 dB
934411904
7
28
17
Locked
QAM256
27
657000000 Hz
0.1 dBmV
36.6 dB
934437070
12
28
18
Locked
QAM256
28
663000000 Hz
-0.3 dBmV
36.4 dB
934440663
8
31
19
Locked
QAM256
29
669000000 Hz
0.0 dBmV
36.3 dB
934443081
10
30
20
Locked
QAM256
30
675000000 Hz
0.0 dBmV
35.8 dB
934447450
12
28
21
Locked
QAM256
31
681000000 Hz
0.6 dBmV
35.9 dB
934450235
11
30
22
Locked
QAM256
32
687000000 Hz
1.1 dBmV
36.0 dB
934456128
10
28
23
Locked
QAM256
33
693000000 Hz
2.1 dBmV
35.9 dB
934458046
14
26
24
Locked
QAM256
34
699000000 Hz
2.9 dBmV
36.1 dB
934462333
7
26
25
Locked
QAM256
35
705000000 Hz
3.7 dBmV
36.3 dB
934466164
0
0
26
Locked
QAM256
36
711000000 Hz
3.7 dBmV
36.3 dB
934469215
0
0
27
Locked
QAM256
37
717000000 Hz
2.6 dBmV
36.0 dB
934473953
0
0
28
Locked
QAM256
38
723000000 Hz
2.5 dBmV
36.1 dB
934476221
0
0
29
Locked
QAM256
39
729000000 Hz
2.0 dBmV
35.9 dB
934482174
0
0
30
Locked
QAM256
40
735000000 Hz
2.4 dBmV
35.8 dB
934483574
0
0
31
Locked
QAM256
41
741000000 Hz
2.4 dBmV
35.6 dB
934486595
0
0
32
Not Locked
Unknown
0
0 Hz
0.0 dBmV
0.0 dB
0
0
0
<tabindex=-1>Upstream Bonded Channels</tabindex=-1>
Channel
Lock Status
Modulation
Channel ID
Frequency
Power
1
Locked
ATDMA
81
36500000 Hz
45.5 dBmV
2
Locked
ATDMA
82
30100000 Hz
45.5 dBmV
3
Locked
ATDMA
83
23700000 Hz
44.0 dBmV
4
Not Locked
Unknown
0
0 Hz
0.0 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</tabindex=-1>
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
25
780000000 Hz
2.4 dBmV
30.8 dB
1108 ~ 2987
620682439
575471180
5054
2
Not Locked
0
0
0 Hz
6.6 dBmV
0.0 dB
0 ~ 4095
0
0
0
<tabindex=-1>Upstream OFDMA Channels</tabindex=-1>
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: Mon May 18 22:08:32 2020
System Up Time: 31:58:3
... View more
05-18-2020
01:54 PM
Do we have a list of those known modems?? Based on prior posts on this forum, seems other CM1000 modems report in the correct range. See prior post https://forums.xfinity.com/t5/Your-Home-Network/Connectivity-Issues-with-Netgear-CM1000/m-p/3333159 where they show 39db on the OFDM channel. I think I'm running low at 30db??
Also, in my event log, I only get nags about OFDM. Not sure what they tell us if anything:
Time
Priority
Description
2020-05-18, 12:52:26
Notice (6)
CM-STATUS message sent. Event Type Code: 24; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 2 3.;CM-MAC=bc:a5:11:89:fc:74;CMTS-MAC=00:01:5c:77:fa:5c;CM-QOS=1.1;CM-VER=3.1;
2020-05-18, 12:51:42
Notice (6)
CM-STATUS message sent. Event Type Code: 16; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=bc:a5:11:89:fc:74;CMTS-MAC=00:01:5c:77:fa:5c;CM-QOS=1.1;CM-VER=3.1;
2020-05-18, 12:50:29
Notice (6)
CM-STATUS message sent. Event Type Code: 24; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 2 3.;CM-MAC=bc:a5:11:89:fc:74;CMTS-MAC=00:01:5c:77:fa:5c;CM-QOS=1.1;CM-VER=3.1;
2020-05-18, 12:49:52
Notice (6)
CM-STATUS message sent. Event Type Code: 16; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=bc:a5:11:89:fc:74;CMTS-MAC=00:01:5c:77:fa:5c;CM-QOS=1.1;CM-VER=3.1;
2020-05-18, 12:48:28
Notice (6)
CM-STATUS message sent. Event Type Code: 24; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 2 3.;CM-MAC=bc:a5:11:89:fc:74;CMTS-MAC=00:01:5c:77:fa:5c;CM-QOS=1.1;CM-VER=3.1;
2020-05-18, 12:48:07
Notice (6)
CM-STATUS message sent. Event Type Code: 16; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=bc:a5:11:89:fc:74;CMTS-MAC=00:01:5c:77:fa:5c;CM-QOS=1.1;CM-VER=3.1;
2020-05-18, 12:45:47
Notice (6)
CM-STATUS message sent. Event Type Code: 24; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 2 3.;CM-MAC=bc:a5:11:89:fc:74;CMTS-MAC=00:01:5c:77:fa:5c;CM-QOS=1.1;CM-VER=3.1;
2020-05-18, 12:45:15
Notice (6)
CM-STATUS message sent. Event Type Code: 16; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=bc:a5:11:89:fc:74;CMTS-MAC=00:01:5c:77:fa:5c;CM-QOS=1.1;CM-VER=3.1;
2020-05-18, 12:42:11
Notice (6)
CM-STATUS message sent. Event Type Code: 24; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 2 3.;CM-MAC=bc:a5:11:89:fc:74;CMTS-MAC=00:01:5c:77:fa:5c;CM-QOS=1.1;CM-VER=3.1;
2020-05-18, 12:41:14
Notice (6)
CM-STATUS message sent. Event Type Code: 16; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=bc:a5:11:89:fc:74;CMTS-MAC=00:01:5c:77:fa:5c;CM-QOS=1.1;CM-VER=3.1;
2020-05-18, 12:40:56
Notice (6)
CM-STATUS message sent. Event Type Code: 24; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 2 3.;CM-MAC=bc:a5:11:89:fc:74;CMTS-MAC=00:01:5c:77:fa:5c;CM-QOS=1.1;CM-VER=3.1;
2020-05-18, 12:40:32
Notice (6)
CM-STATUS message sent. Event Type Code: 16; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=bc:a5:11:89:fc:74;CMTS-MAC=00:01:5c:77:fa:5c;CM-QOS=1.1;CM-VER=3.1;
... View more
05-18-2020
12:50 PM
Tried to insert image of modem status page with channels/levels etc, no go. So, below is a text paste.... See RED line near bottom.
Also, I tried plugging coax enetering home straight to modem to bypass splitter that splits TV/internet and there was no improvement to SNR or download speed.
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</tabindex=-1>
Procedure
Status
Comment
Acquire Downstream Channel
579000000 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</tabindex=-1>
Channel
Lock Status
Modulation
Channel ID
Frequency
Power
SNR / MER
Unerrored Codewords
Correctable Codewords
Uncorrectable Codewords
1
Locked
QAM256
13
579000000 Hz
1.0 dBmV
38.1 dB
3253066445
0
0
2
Locked
QAM256
10
561000000 Hz
1.5 dBmV
38.1 dB
3252151242
0
0
3
Locked
QAM256
11
567000000 Hz
1.4 dBmV
38.1 dB
3252155575
0
0
4
Locked
QAM256
12
573000000 Hz
1.4 dBmV
38.1 dB
3252158984
0
0
5
Locked
QAM256
14
585000000 Hz
1.2 dBmV
38.0 dB
3252162445
0
0
6
Locked
QAM256
15
591000000 Hz
1.1 dBmV
38.0 dB
3252166076
0
0
7
Locked
QAM256
16
597000000 Hz
0.4 dBmV
37.7 dB
3252169819
0
0
8
Locked
QAM256
17
603000000 Hz
0.0 dBmV
37.6 dB
3252174714
0
0
9
Locked
QAM256
18
609000000 Hz
-0.3 dBmV
37.4 dB
3252182066
0
0
10
Locked
QAM256
19
633000000 Hz
1.2 dBmV
37.3 dB
3252184269
13
19
11
Locked
QAM256
20
615000000 Hz
-0.4 dBmV
37.2 dB
3252189855
0
0
12
Locked
QAM256
21
621000000 Hz
-0.1 dBmV
37.3 dB
3252192232
0
0
13
Locked
QAM256
22
627000000 Hz
1.1 dBmV
37.4 dB
3252196705
0
0
14
Locked
QAM256
23
639000000 Hz
1.9 dBmV
37.2 dB
3252178876
3
31
15
Locked
QAM256
24
645000000 Hz
1.3 dBmV
37.1 dB
3252179190
6
28
16
Locked
QAM256
26
651000000 Hz
1.2 dBmV
36.8 dB
3252174005
7
28
17
Locked
QAM256
27
657000000 Hz
0.4 dBmV
36.6 dB
3252191404
12
28
18
Locked
QAM256
28
663000000 Hz
-0.1 dBmV
36.4 dB
3252193947
8
31
19
Locked
QAM256
29
669000000 Hz
0.2 dBmV
36.3 dB
3252197864
10
30
20
Locked
QAM256
30
675000000 Hz
0.3 dBmV
35.8 dB
3252202244
12
28
21
Locked
QAM256
31
681000000 Hz
0.8 dBmV
36.1 dB
3252203872
11
30
22
Locked
QAM256
32
687000000 Hz
1.3 dBmV
36.0 dB
3252209285
10
28
23
Locked
QAM256
33
693000000 Hz
2.4 dBmV
36.0 dB
3252212822
14
26
24
Locked
QAM256
34
699000000 Hz
3.1 dBmV
36.1 dB
3252217002
7
26
25
Locked
QAM256
35
705000000 Hz
3.9 dBmV
36.4 dB
3252220387
0
0
26
Locked
QAM256
36
711000000 Hz
3.9 dBmV
36.2 dB
3252224000
0
0
27
Locked
QAM256
37
717000000 Hz
2.9 dBmV
36.1 dB
3252227924
0
0
28
Locked
QAM256
38
723000000 Hz
2.7 dBmV
36.0 dB
3252230639
0
0
29
Locked
QAM256
39
729000000 Hz
2.2 dBmV
35.8 dB
3252236420
0
0
30
Locked
QAM256
40
735000000 Hz
2.7 dBmV
35.9 dB
3252238115
0
0
31
Locked
QAM256
41
741000000 Hz
2.6 dBmV
35.7 dB
3252241795
0
0
32
Not Locked
Unknown
0
0 Hz
0.0 dBmV
0.0 dB
0
0
0
<tabindex=-1>Upstream Bonded Channels</tabindex=-1>
Channel
Lock Status
Modulation
Channel ID
Frequency
Power
1
Locked
ATDMA
81
36500000 Hz
45.5 dBmV
2
Locked
ATDMA
82
30100000 Hz
45.5 dBmV
3
Locked
ATDMA
83
23700000 Hz
44.0 dBmV
4
Not Locked
Unknown
0
0 Hz
0.0 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</tabindex=-1>
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
25
780000000 Hz
2.8 dBmV
31.0 dB
1108 ~ 2987
346999323
318918359
3906
2
Not Locked
0
0
0 Hz
6.8 dBmV
0.0 dB
0 ~ 4095
0
0
0
<tabindex=-1>Upstream OFDMA Channels</tabindex=-1>
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: Mon May 18 10:03:23 2020
System Up Time: 19:53:27
... View more
05-18-2020
12:38 PM
I just connected a new netgear CM1000V2 because my old zoom modem had to be rebooted about once a day to to lock-up (would lose connection completely). Netgear seems to have solved the loss of connectivity. I pay for 300mbps plan and comcast speed test shows my downstream is 200mbps +/-. House desktops and TVs all hardwired with home run connections to aggregating PCs<->Gig-E switch <-> router<->cblmodem. After a lot of reading-up on modem signal levels, I am questioning my downstream OFDM SNR - its 30-31 db. All other downstream channels are 35-39 SNR. Power levels look good (downstream running 0-4dbmv). Uncorrectables are very small.
... View more
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