Since my upgrade from 200 to 350 as part of the VOLT benefits my upstream speed has intermittently dropped from 36 mbps to around 5 mbps with QAM dropping to 16 on three or four channels. Downstream is rock solid. Prior to the ‘upgrade’ both upstream and downstream were rock solid.
Upstream went off a cliff at about 0940 this morning:
Yes, the tech fitted an attenuator on his first visit as he said the power levels were too high. He left it in place when he came back and replaced my modem. I did mention to him that some were now lower than -6, but he said something along the lines that the results from logging into the modem weren’t accurate.
@carl_pearce wrote:
@pjayuk wrote:Yes, the tech fitted an attenuator on his first visit as he said the power levels were too high. He left it in place when he came back and replaced my modem. I did mention to him that some were now lower than -6, but he said something along the lines that the results from logging into the modem weren’t accurate.
Can you see what the value of it is?
3dB
@carl_pearce wrote:
@pjayuk wrote:
@carl_pearce wrote:
@pjayuk wrote:Yes, the tech fitted an attenuator on his first visit as he said the power levels were too high. He left it in place when he came back and replaced my modem. I did mention to him that some were now lower than -6, but he said something along the lines that the results from logging into the modem weren’t accurate.
Can you see what the value of it is?
3dB
For what it's worth I'd remove it (HUB must be powered off).
Ok, I powered down and removed it. New downstream power levels without the attenuator:
Downstream bonded channels
Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID
| 1 | 331000000 | 0 | 38 | 256 qam | 25 |
| 2 | 203000000 | 2.2 | 38 | 256 qam | 9 |
| 3 | 211000000 | 1.7 | 38 | 256 qam | 10 |
| 4 | 219000000 | 1.5 | 38 | 256 qam | 11 |
| 5 | 227000000 | 1.2 | 38 | 256 qam | 12 |
| 6 | 235000000 | 1 | 38 | 256 qam | 13 |
| 7 | 243000000 | 0.9 | 38 | 256 qam | 14 |
| 8 | 251000000 | 0.7 | 38 | 256 qam | 15 |
| 9 | 259000000 | 0.5 | 38 | 256 qam | 16 |
| 10 | 267000000 | 0.5 | 38 | 256 qam | 17 |
| 11 | 275000000 | 0.5 | 38 | 256 qam | 18 |
| 12 | 283000000 | 0.5 | 38 | 256 qam | 19 |
| 13 | 291000000 | 0.2 | 38 | 256 qam | 20 |
| 14 | 299000000 | 0.9 | 38 | 256 qam | 21 |
| 15 | 307000000 | 0.5 | 38 | 256 qam | 22 |
| 16 | 315000000 | 0 | 38 | 256 qam | 23 |
| 17 | 323000000 | 0 | 38 | 256 qam | 24 |
| 18 | 339000000 | 0 | 38 | 256 qam | 26 |
| 19 | 347000000 | 0 | 38 | 256 qam | 27 |
| 20 | 355000000 | -0.2 | 38 | 256 qam | 28 |
| 21 | 363000000 | -0.5 | 38 | 256 qam | 29 |
| 22 | 371000000 | -0.4 | 38 | 256 qam | 30 |
| 23 | 379000000 | -0.2 | 38 | 256 qam | 31 |
| 24 | 387000000 | -0.2 | 38 | 256 qam | 32 |
@carl_pearce wrote:Ok, better, and what do your upstream channels look like?
Actually, now I have removed them, I can see that it’s actually two 3 dB attenuators screwed together. New upstream, one channel still at 32 QAM:
Upstream bonded channels
Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
| 1 | 60300000 | 45.8 | 5120 | 64 qam | 1 |
| 2 | 39400000 | 45.3 | 5120 | 64 qam | 4 |
| 3 | 46200000 | 45.3 | 5120 | 32 qam | 3 |
| 4 | 53700000 | 45.5 | 5120 | 64 qam | 2 |
Upstream bonded channels
Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts
| 1 | ATDMA | 0 | 0 | 0 | 0 |
| 2 | ATDMA | 0 | 0 | 0 | 0 |
| 3 | ATDMA | 0 | 0 | 0 | 0 |
| 4 | ATDMA | 0 | 0 | 0 | 0 |
All upstream returned to 64 QAM now:
Upstream bonded channels
Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
| 1 | 60300000 | 45.8 | 5120 | 64 qam | 1 |
| 2 | 39400000 | 45.3 | 5120 | 64 qam | 4 |
| 3 | 46200000 | 45.3 | 5120 | 64 qam | 3 |
| 4 | 53700000 | 45.5 | 5120 | 64 qam | 2 |
@carl_pearce wrote:Ok, and how is your connection currently?
I'm assuming your upstream will become sporadic again at some point.
Seems good, 380 Mbps down, 35.4 Mbps up, measured using the Speedtest app on my iPad. Probably would be slightly better if I checked on my Ethernet-connected Mac.
