Upstream Modulation Changing
Hi,
I have a Hub 5 in modem mode. Ive noticed that the Upstream modulation has started to fluctuate between 32QAM and 64QAM. This has been happening for over a month now. Initially the modulation would drop to 16QAM and stay between 16 and 32. However, more recently its been sticking at 32QAM, then jumping to 64 and then going back to 32.
Speeds seem to be ok but I have started to notice random packet loss. Last Thursday evening packet loss was very bad but it seems to have stabilised. I have called CS multiple times but the script they follow doesnt seem to have an answer to my issue. Packet loss is still occurring, not as bad, just small amounts randomly. Dont know if anyone can see an issue with my levels?
Cable Modem Status | ||
Item | Status | Type |
Cable Modem Status | Online | DOCSIS 3.0 |
Primary downstream channel | Locked | SC-QAM |
Channel Overview | Downstream | Upstream |
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 | 331000000 | 6.9 | 41 | QAM 256 | 25 |
2 | 139000000 | 9.4 | 40 | QAM 256 | 1 |
3 | 147000000 | 9.3 | 40 | QAM 256 | 2 |
4 | 155000000 | 9.2 | 40 | QAM 256 | 3 |
5 | 163000000 | 8.9 | 40 | QAM 256 | 4 |
6 | 171000000 | 8.8 | 39 | QAM 256 | 5 |
7 | 179000000 | 8.5 | 39 | QAM 256 | 6 |
8 | 187000000 | 8.4 | 39 | QAM 256 | 7 |
9 | 195000000 | 8.3 | 39 | QAM 256 | 8 |
10 | 203000000 | 8.1 | 39 | QAM 256 | 9 |
11 | 211000000 | 8.2 | 39 | QAM 256 | 10 |
12 | 219000000 | 8.1 | 39 | QAM 256 | 11 |
13 | 227000000 | 7.8 | 38 | QAM 256 | 12 |
14 | 235000000 | 7.6 | 38 | QAM 256 | 13 |
15 | 243000000 | 7.3 | 38 | QAM 256 | 14 |
16 | 251000000 | 7 | 39 | QAM 256 | 15 |
17 | 259000000 | 6.8 | 39 | QAM 256 | 16 |
18 | 267000000 | 6.7 | 39 | QAM 256 | 17 |
19 | 275000000 | 6.6 | 39 | QAM 256 | 18 |
20 | 283000000 | 6.5 | 40 | QAM 256 | 19 |
21 | 291000000 | 6.7 | 40 | QAM 256 | 20 |
22 | 299000000 | 6.7 | 40 | QAM 256 | 21 |
23 | 307000000 | 7 | 40 | QAM 256 | 22 |
24 | 315000000 | 7 | 40 | QAM 256 | 23 |
25 | 323000000 | 7.1 | 41 | QAM 256 | 24 |
26 | 339000000 | 7 | 41 | QAM 256 | 26 |
27 | 347000000 | 6.7 | 41 | QAM 256 | 27 |
28 | 355000000 | 6.7 | 41 | QAM 256 | 28 |
29 | 363000000 | 6.5 | 41 | QAM 256 | 29 |
30 | 371000000 | 6.5 | 41 | QAM 256 | 30 |
31 | 379000000 | 6.5 | 41 | QAM 256 | 31 |
3.0 Downstream channels
Channel | Locked Status | RxMER (dB) | Pre RS Errors | Post RS Errors |
1 | Locked | 41 | 52 | 0 |
2 | Locked | 40 | 0 | 0 |
3 | Locked | 40 | 0 | 0 |
4 | Locked | 40 | 0 | 0 |
5 | Locked | 40 | 0 | 0 |
6 | Locked | 39 | 1 | 0 |
7 | Locked | 39 | 0 | 0 |
8 | Locked | 39 | 0 | 0 |
9 | Locked | 39 | 6 | 0 |
10 | Locked | 39 | 6 | 0 |
11 | Locked | 39 | 18 | 0 |
12 | Locked | 39 | 10 | 0 |
13 | Locked | 38 | 17 | 0 |
14 | Locked | 38 | 21 | 0 |
15 | Locked | 38 | 29 | 0 |
16 | Locked | 39 | 39 | 0 |
17 | Locked | 39 | 50 | 0 |
18 | Locked | 39 | 98 | 0 |
19 | Locked | 39 | 116 | 0 |
20 | Locked | 40 | 115 | 0 |
21 | Locked | 40 | 60 | 0 |
22 | Locked | 40 | 73 | 0 |
23 | Locked | 40 | 55 | 0 |
24 | Locked | 40 | 73 | 0 |
25 | Locked | 41 | 47 | 0 |
26 | Locked | 41 | 45 | 0 |
27 | Locked | 41 | 95 | 0 |
28 | Locked | 41 | 81 | 0 |
29 | Locked | 41 | 123 | 0 |
30 | Locked | 41 | 126 | 0 |
31 | Locked | 41 | 156 | 0 |
3.1 Downstream channels
Channel | Channel Width (MHz) | FFT Type | Number of Active Subcarriers | Modulation (Active Profile) | First Active Subcarrier (Hz) |
41 | 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) |
41 | Locked | 41 | 4.9 | 809061304 | 65 |
3.0 Upstream channels
Channel | Frequency (Hz) | Power (dBmV) | Symbol Rate (ksps) | Modulation | Channel ID |
0 | 49600000 | 44.5 | 5120 | QAM 32 | 1 |
1 | 43100000 | 44.3 | 5120 | QAM 32 | 2 |
2 | 36600000 | 44.3 | 5120 | QAM 32 | 3 |
3 | 30100000 | 44 | 5120 | QAM 32 | 4 |
4 | 23600000 | 43.8 | 5120 | QAM 32 | 5 |
3.0 Upstream channels
Channel | Channel Type | T1 Timeouts | T2 Timeouts | T3 Timeouts | T4 Timeouts |
0 | ATDMA | 0 | 0 | 0 | 0 |
1 | ATDMA | 0 | 0 | 9 | 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 | 11 | 40.0 | 2K | QAM 256 |
3.1 Upstream channels
Channel | Channel Type | Number of Active Subcarriers | First Active Subcarrier (Hz) | T3 Timeouts | T4 Timeouts |
6 | OFDMA | 220 | 74000000 | 0 | 0 |