on 26-01-2023 17:12
hi please can some one help me out called virgin media no help ever night i lose my upstream and my download speed drops of reset router done ever thing i can still the same
this is the info from my router#]#
Downstream bonded channels
1 | 306000000 | -4.2 | 37 | QAM 256 | 22 |
2 | 138000000 | -3.2 | 38 | QAM 256 | 1 |
3 | 146000000 | -3.3 | 38 | QAM 256 | 2 |
4 | 154000000 | -3.3 | 37 | QAM 256 | 3 |
5 | 162000000 | -3.2 | 37 | QAM 256 | 4 |
6 | 170000000 | -3.2 | 38 | QAM 256 | 5 |
7 | 178000000 | -3.1 | 37 | QAM 256 | 6 |
8 | 186000000 | -3 | 37 | QAM 256 | 7 |
9 | 194000000 | -2.8 | 38 | QAM 256 | 8 |
10 | 202000000 | -2.8 | 38 | QAM 256 | 9 |
11 | 210000000 | -2.7 | 37 | QAM 256 | 10 |
12 | 218000000 | -2.8 | 37 | QAM 256 | 11 |
13 | 226000000 | -2.9 | 38 | QAM 256 | 12 |
14 | 234000000 | -2.9 | 38 | QAM 256 | 13 |
15 | 242000000 | -3.1 | 37 | QAM 256 | 14 |
16 | 250000000 | -3.3 | 38 | QAM 256 | 15 |
17 | 258000000 | -3.5 | 37 | QAM 256 | 16 |
18 | 266000000 | -3.5 | 38 | QAM 256 | 17 |
19 | 274000000 | -3.8 | 38 | QAM 256 | 18 |
20 | 282000000 | -4 | 37 | QAM 256 | 19 |
21 | 290000000 | -4.1 | 38 | QAM 256 | 20 |
22 | 298000000 | -4.2 | 38 | QAM 256 | 21 |
23 | 314000000 | -4.2 | 37 | QAM 256 | 23 |
24 | 322000000 | -4.3 | 37 | QAM 256 | 24 |
25 | 330000000 | -4.2 | 37 | QAM 256 | 25 |
26 | 338000000 | -4 | 37 | QAM 256 | 26 |
27 | 346000000 | -3.9 | 38 | QAM 256 | 27 |
28 | 354000000 | -3.9 | 37 | QAM 256 | 28 |
29 | 362000000 | -3.7 | 37 | QAM 256 | 29 |
30 | 370000000 | -3.7 | 37 | QAM 256 | 30 |
31 | 378000000 | -3.6 | 38 | QAM 256 | 31 |
Downstream bonded channels
1 | Locked | 37 | 1 | 0 |
2 | Locked | 38 | 0 | 0 |
3 | Locked | 38 | 0 | 0 |
4 | Locked | 37 | 0 | 0 |
5 | Locked | 37 | 0 | 0 |
6 | Locked | 38 | 0 | 0 |
7 | Locked | 37 | 0 | 0 |
8 | Locked | 37 | 0 | 0 |
9 | Locked | 38 | 0 | 0 |
10 | Locked | 38 | 0 | 0 |
11 | Locked | 37 | 0 | 0 |
12 | Locked | 37 | 0 | 0 |
13 | Locked | 38 | 0 | 0 |
14 | Locked | 38 | 0 | 0 |
15 | Locked | 37 | 0 | 0 |
16 | Locked | 38 | 0 | 0 |
17 | Locked | 37 | 0 | 0 |
18 | Locked | 38 | 0 | 0 |
19 | Locked | 38 | 0 | 0 |
20 | Locked | 37 | 3 | 0 |
21 | Locked | 38 | 0 | 0 |
22 | Locked | 38 | 0 | 0 |
23 | Locked | 37 | 0 | 0 |
24 | Locked | 37 | 0 | 0 |
25 | Locked | 37 | 0 | 0 |
26 | Locked | 37 | 0 | 0 |
27 | Locked | 38 | 0 | 0 |
28 | Locked | 37 | 0 | 0 |
29 | Locked | 37 | 0 | 0 |
30 | Locked | 37 | 0 | 0 |
31 | Locked | 38 | 0 | 0 |
0 | 60300000 | 41.3 | 5120 | QPSK | 5 |
1 | 53700000 | 41.3 | 5120 | QPSK | 6 |
2 | 46200000 | 41.3 | 5120 | QPSK | 7 |
3 | 39400000 | 41.8 | 5120 | QPSK | 8 |
Upstream bonded channels
0 | ATDMA | 0 | 0 | 0 | 0 |
1 | ATDMA | 0 | 0 | 0 | 0 |
2 | ATDMA | 0 | 0 | 37 | 0 |
3 | ATDMA | 0 | 0 | 0 | 0 |
on 26-01-2023 17:54
Downstream power a little low and tonnes of T3 timeouts on channel 2. Check all cables and connections are tight and in good condition and try a pinhole reset of the hub. Also check for local faults on 0800 561 0061.
on 26-01-2023 18:52
Is this a UK Residential installation ?
Upstream channel modulation is QPSK (16 qam) which is lowest speed due to noise on the service, this would reduce the Upstream performance.
For a 1Gb/s service there are also usually a pair of DOCSIS 3.1 Upstream and Downstream channels.
on 26-01-2023 19:06
Might be a hub 5 quirk.
on 26-01-2023 21:52
@Client62 wrote:Upstream channel modulation is QPSK (16 qam) which is lowest speed due to noise on the service, this would reduce the Upstream performance.
It's even worse. QPSK is equivalent to 4-QAM. It doesn't get much worse than this.
26-01-2023 22:48 - edited 26-01-2023 22:50
Literally doesn't get any worse without losing lock: DoCSIS doesn't do BPSK.
To force a drop to QPSK you're talking an SNR of 12 dB and it looks like it can't even hold that on the one upstream.
It couldn't be much worse if someone had maliciously plugged a noise generator into the segment.
on 27-01-2023 09:29
on 27-01-2023 15:07
We have the FTTP/RFoG solution too and the Upstream modulation is supposed to be 64 QAM on all channels.
If the problems persist, call 0800 561 0061 for local errors. ( it is an automated service )
28-01-2023 15:14 - edited 28-01-2023 15:15
@IPFreely wrote:Literally doesn't get any worse without losing lock: DoCSIS doesn't do BPSK.
Technically, as long as there is traffic flowing, it can get worse. 🙂
on 29-01-2023 10:14