Hub 3 Status & Clarification
I Have had a little bit of an issue with my Hub 3 as of late & I am after some clarification of If i have an issue or not,
From what i have read on here my power Level for
Downstream are perfectly fine (between -2 - 0 )
Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID
1 | 227000000 | -1.7 | 40 | 256 qam | 12 |
2 | 219000000 | -1 | 40 | 256 qam | 11 |
3 | 235000000 | -1.4 | 40 | 256 qam | 13 |
4 | 243000000 | -1.2 | 40 | 256 qam | 14 |
5 | 251000000 | -1 | 40 | 256 qam | 15 |
6 | 259000000 | -0.5 | 40 | 256 qam | 16 |
7 | 267000000 | -0.2 | 40 | 256 qam | 17 |
8 | 275000000 | -0.5 | 38 | 256 qam | 18 |
9 | 283000000 | -0.2 | 40 | 256 qam | 19 |
10 | 291000000 | 0.4 | 40 | 256 qam | 20 |
11 | 299000000 | 0.7 | 38 | 256 qam | 21 |
12 | 307000000 | 0.5 | 40 | 256 qam | 22 |
13 | 315000000 | 0.9 | 38 | 256 qam | 23 |
14 | 323000000 | 0.9 | 40 | 256 qam | 24 |
15 | 331000000 | 0.5 | 38 | 256 qam | 25 |
16 | 339000000 | 0.7 | 38 | 256 qam | 26 |
17 | 347000000 | 0.9 | 40 | 256 qam | 27 |
18 | 355000000 | 0.5 | 38 | 256 qam | 28 |
19 | 363000000 | 0 | 38 | 256 qam | 29 |
20 | 371000000 | 0 | 38 | 256 qam | 30 |
21 | 379000000 | 0 | 38 | 256 qam | 31 |
22 | 387000000 | 0 | 38 | 256 qam | 32 |
23 | 395000000 | -0.5 | 38 | 256 qam | 33 |
24 | 403000000 | -0.7 | 38 | 256 qam | 34 |
Downstream bonded channels
Channe Locked Status RxMER (dB) Pre RS Errors Post RS Errors
1 | Locked | 40.3 | 598 | 0 |
2 | Locked | 40.9 | 434 | 0 |
3 | Locked | 40.3 | 563 | 0 |
4 | Locked | 40.3 | 600 | 0 |
5 | Locked | 40.9 | 606 | 0 |
6 | Locked | 40.3 | 732 | 0 |
7 | Locked | 40.3 | 699 | 0 |
8 | Locked | 38.9 | 741 | 0 |
9 | Locked | 40.9 | 688 | 0 |
10 | Locked | 40.3 | 809 | 0 |
11 | Locked | 38.9 | 1564 | 0 |
12 | Locked | 40.3 | 1405 | 0 |
13 | Locked | 38.9 | 1561 | 0 |
14 | Locked | 40.3 | 1498 | 0 |
15 | Locked | 38.6 | 1851 | 0 |
16 | Locked | 38.9 | 1999 | 0 |
17 | Locked | 40.9 | 1806 | 0 |
18 | Locked | 38.9 | 1892 | 0 |
19 | Locked | 38.9 | 1944 | 0 |
20 | Locked | 38.9 | 2196 | 0 |
21 | Locked | 38.6 | 2154 | 0 |
22 | Locked | 38.9 | 1298 | 0 |
23 | Locked | 38.6 | 1347 | 0 |
24 | Locked | 38.6 | 1526 | 0 |
Upstream is where is i am after some clarification, If i have read rightly it should be >34 but <51
Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
1 | 49600000 | 50.8 | 5120 | 64 qam | 1 |
2 | 36600000 | 49.3 | 5120 | 64 qam | 3 |
3 | 30100001 | 48.3 | 5120 | 64 qam | 4 |
4 | 23600195 | 47.5 | 5120 | 32 qam | 5 |
5 | 43100000 | 49.8 | 5120 | 64 qam | 2 |
The reason i am asking is over the last week, I have had quite a few t3 errors, Which i am afraid i cant show you as i have reset the router so log isnt available
But i do remember i had these show up RCS Partial Service & Lost MDD Timeout as well as only have 1 channel on that Upstream which now seems to be back to norm with 5
so my question is how do you lower the DbV of the Upstream without effecting the downstream, if its close to the Max spec
Lost MDD is generally a downstream issue, as is the RCS error (the R, incidentally stands for ‘received’, ie what the hub is getting). All I can tell from what you have posted is that one upstream channel has dropped to 32 QAM (however it is the 23.6 MHz channel which is renown for being susceptible to interference) but, that, in itself isn't worth losing sleep over.
T3 errors aren’t too unusual, one or two a day is fine, if you are only getting one upstream channel, then, yes that is a serious problem, but if it is now back to the usual five, then fine. Remember that on startup the hub will only have a few channels locked which provide it with the information it needs to lock onto the others (slightly simplified, but still).
And in answer to your last point, you can’t. The hub automatically ramps up the power until the other end (the CMTS) confirms that it is receiving it loud and clear.