fatedsnowfox
6 months agoDialled in
Connection bouncing intermittently, suspect DOCSIS 3.1 levels
Hi!
Been a long time since I posted here! Been having an issue with my connection pretty much from when it was installed. It will intermittently start bouncing up and down - last night was particularly bad, with 26 interruptions in the space of an hour. Looking at the stats I think our DOCSIS 3.1 levels are out of spec and we have a fault - our PLC power is -15.5DBmV where I think the spec is like supposed to be -6 to +10DBmV. Full logs below! :
Cable Modem StatusItem Status TypeChannel Overview Downstream Upstream
Cable Modem Status | Online | DOCSIS 3.0 |
Primary downstream channel | Locked | SC-QAM |
DOCSIS 3.0 channels | 31 | 5 |
DOCSIS 3.1 channels | 1 | 1 |
3.0 Downstream channels
Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID
1 | 339000000 | -6.5 | 39 | QAM 256 | 26 |
2 | 139000000 | 0.3 | 40 | QAM 256 | 1 |
3 | 147000000 | 0.2 | 40 | QAM 256 | 2 |
4 | 155000000 | 0.5 | 40 | QAM 256 | 3 |
5 | 163000000 | 0.9 | 40 | QAM 256 | 4 |
6 | 171000000 | -1.4 | 40 | QAM 256 | 5 |
7 | 179000000 | -1.9 | 40 | QAM 256 | 6 |
8 | 187000000 | -2.2 | 40 | QAM 256 | 7 |
9 | 195000000 | -2.2 | 40 | QAM 256 | 8 |
10 | 203000000 | -2.5 | 40 | QAM 256 | 9 |
11 | 211000000 | -2.8 | 40 | QAM 256 | 10 |
12 | 219000000 | -3.2 | 40 | QAM 256 | 11 |
13 | 227000000 | -3.9 | 40 | QAM 256 | 12 |
14 | 235000000 | -4 | 40 | QAM 256 | 13 |
15 | 251000000 | -4.6 | 40 | QAM 256 | 15 |
16 | 259000000 | -4.7 | 40 | QAM 256 | 16 |
17 | 267000000 | -4.8 | 40 | QAM 256 | 17 |
18 | 275000000 | -4.8 | 40 | QAM 256 | 18 |
19 | 283000000 | -4.9 | 40 | QAM 256 | 19 |
20 | 291000000 | -5.1 | 40 | QAM 256 | 20 |
21 | 299000000 | -5.3 | 40 | QAM 256 | 21 |
22 | 307000000 | -5.8 | 40 | QAM 256 | 22 |
23 | 315000000 | -5.9 | 40 | QAM 256 | 23 |
24 | 323000000 | -6.3 | 40 | QAM 256 | 24 |
25 | 331000000 | -6.4 | 40 | QAM 256 | 25 |
26 | 347000000 | -7 | 39 | QAM 256 | 27 |
27 | 355000000 | -6.9 | 40 | QAM 256 | 28 |
28 | 363000000 | -6.9 | 40 | QAM 256 | 29 |
29 | 371000000 | -7.3 | 39 | QAM 256 | 30 |
30 | 379000000 | -7.6 | 39 | QAM 256 | 31 |
31 | 387000000 | -8.3 | 39 | QAM 256 | 32 |
3.0 Downstream channels
Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors
1 | Locked | 39 | 88 | 0 |
2 | Locked | 40 | 35 | 0 |
3 | Locked | 40 | 36 | 0 |
4 | Locked | 40 | 33 | 0 |
5 | Locked | 40 | 19 | 0 |
6 | Locked | 40 | 63 | 0 |
7 | Locked | 40 | 112 | 0 |
8 | Locked | 40 | 41 | 0 |
9 | Locked | 40 | 30 | 0 |
10 | Locked | 40 | 36 | 0 |
11 | Locked | 40 | 26 | 0 |
12 | Locked | 40 | 23 | 0 |
13 | Locked | 40 | 28 | 0 |
14 | Locked | 40 | 37 | 0 |
15 | Locked | 40 | 30 | 0 |
16 | Locked | 40 | 46 | 0 |
17 | Locked | 40 | 69 | 0 |
18 | Locked | 40 | 73 | 0 |
19 | Locked | 40 | 65 | 0 |
20 | Locked | 40 | 34 | 0 |
21 | Locked | 40 | 28 | 0 |
22 | Locked | 40 | 53 | 0 |
23 | Locked | 40 | 59 | 0 |
24 | Locked | 40 | 72 | 0 |
25 | Locked | 40 | 73 | 0 |
26 | Locked | 39 | 111 | 0 |
27 | Locked | 40 | 102 | 0 |
28 | Locked | 40 | 104 | 0 |
29 | Locked | 39 | 177 | 0 |
30 | Locked | 39 | 223 | 0 |
31 | Locked | 39 | 398 | 0 |
3.1 Downstream channels
Channel Channel Width (MHz) FFT Type Number of Active Subcarriers Modulation (Active Profile) First Active Subcarrier (Hz)
33 | 94 | 4K | 1840 | QAM 4096 | 1108 |
3.1 Downstream channels
Channel ID Locked Status RxMER Data (dB) PLC Power (dBmV) Corrected errors (Active Profile) Uncorrectable errors (Active Profile)
33 | Locked | 35 | -15.5 | 611240571 | 7827454 |
3.0 Upstream channels
Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
0 | 49600000 | 45.8 | 5120 | QAM 64 | 1 |
1 | 43100000 | 45.8 | 5120 | QAM 64 | 2 |
2 | 36600000 | 45.8 | 5120 | QAM 64 | 3 |
3 | 30100000 | 45.8 | 5120 | QAM 64 | 4 |
4 | 23600000 | 45.8 | 5120 | QAM 64 | 5 |
3.0 Upstream channels
Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts
0 | ATDMA | 0 | 0 | 5 | 0 |
1 | ATDMA | 0 | 0 | 3 | 0 |
2 | ATDMA | 0 | 0 | 0 | 0 |
3 | ATDMA | 0 | 0 | 0 | 0 |
4 | ATDMA | 0 | 0 | 0 | 0 |
3.1 Upstream channels
Channel Channel Width (MHz) Power (dBmV) FFT Type Modulation
6 | 10.4 | 41.2 | 2K | QAM 256 |
3.1 Upstream channels
Channel Channel Type Number of Active Subcarriers First Active Subcarrier (Hz) T3 Timeouts T4 Timeouts
6 | OFDMA | 208 | 74000000 | 0 | 0 |
General Configuration
Network accessMaximum Number of CPEsBaseline PrivacyDOCSIS ModeConfig file
Allowed |
1 |
Enabled |
3.1 |
cmreg-vmdg660-bbt076-b.cm |
Primary Downstream Service Flow
SFIDMax Traffic RateMax Traffic BurstMin Traffic Rate
35890 |
1230000450 bps |
42600bytes |
0 bps |
Primary Upstream Service Flow
SFIDMax Traffic RateMax Traffic BurstMin Traffic RateMax Concatenated BurstScheduling Type
35889 |
110000274 bps |
42600bytes |
0 bps |
42600bytes |
Best Effort |