09-07-2021 23:31 - edited 09-07-2021 23:36
Hi all,
Thanks in advance for any assistance!
Ive been checking the stats on my SuperHub 4 and the signal strength and SNR seem to fluctuate up and down each day. I assume this is normal?
The SNR values are also identical right down to every decimal place on many of the channels. Surely this can't be accurate?
I also keep getting network log errors for T3 time outs and something about the power level exceeding the maximum value allowed:
RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW
My signal levels and SNR are "within spec" between +4 and +6 on all channels and SNR averages 37. Minimal post RS errors apart from fresh after a reboot.
Just looking for guidance on the accuracy of the above stats and if this is all normal.
Cheers all.
Answered! Go to Answer
on 09-07-2021 23:42
That's not uncommon with both Upstream and DS SNR. Your forward levels should be between -6/+10 and SNR above 34. Return levels should be between 33-51 with SNR above 28 (ideally 32) but cant see US SNR from hub Data.
T3's are when Ranging Request Retries are Exhausted and can be caused by network issues or a faulty splitter or isolator. Check all connections are clean and tight and reboot the hub to clear counters. See what they are after 24 hours. Low numbers wont cause an issue so if there's no problems with service, i wouldn't worry
on 09-07-2021 23:34
Downstream:
Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID
1 138750000 5.500000 36.386890 QAM256 1
2 146750000 5.400002 36.386890 QAM256 2
3 154750000 6.400002 36.386890 QAM256 3
4 162750000 6.400002 37.636276 QAM256 4
5 170750000 6.400002 37.355988 QAM256 5
6 178750000 6.400002 37.636276 QAM256 6
7 186750000 6.699997 37.355988 QAM256 7
8 194750000 6.699997 37.636276 QAM256 8
9 202750000 6.599998 37.636276 QAM256 9
10 210750000 6.500000 37.636276 QAM256 10
11 218750000 6.500000 37.636276 QAM256 11
12 226750000 6.400002 37.636276 QAM256 12
13 234750000 6.099998 37.636276 QAM256 13
14 242750000 5.900002 37.636276 QAM256 14
15 250750000 5.900002 37.355988 QAM256 15
16 258750000 5.500000 37.636276 QAM256 16
17 266750000 5.599998 37.636276 QAM256 17
18 274750000 5.599998 37.636276 QAM256 18
19 282750000 5.699997 38.605377 QAM256 19
20 290750000 5.599998 38.605377 QAM256 20
21 298750000 5.500000 38.605377 QAM256 21
22 306750000 5.400002 38.605377 QAM256 22
23 314750000 5.400002 38.983261 QAM256 23
24 322750000 5.300003 38.605377 QAM256 24
25 330750000 4.699997 37.636276 QAM256 25
26 370750000 4.099998 37.355988 QAM256 26
27 378750000 4.300003 37.636276 QAM256 27
28 386750000 4.099998 38.605377 QAM256 28
29 394750000 4.199997 38.605377 QAM256 29
30 402750000 4.500000 38.605377 QAM256 30
31 410750000 4.300003 38.605377 QAM256 31
32 418750000 4.099998 38.605377 QAM256 32
3.0 Downstream channels
Channel Lock Status RxMER (dB) Pre RS Errors Post RS Errors
1 Locked 36.386890 0 0
2 Locked 36.386890 0 0
3 Locked 36.386890 0 0
4 Locked 37.636276 0 0
5 Locked 37.355988 0 0
6 Locked 37.636276 0 0
7 Locked 37.355988 0 0
8 Locked 37.636276 0 0
9 Locked 37.636276 0 0
10 Locked 37.636276 0 0
11 Locked 37.636276 0 0
12 Locked 37.636276 0 0
13 Locked 37.636276 0 0
14 Locked 37.636276 0 0
15 Locked 37.355988 0 0
16 Locked 37.636276 0 0
17 Locked 37.636276 0 0
18 Locked 37.636276 0 0
19 Locked 38.605377 0 0
20 Locked 38.605377 0 0
21 Locked 38.605377 0 0
22 Locked 38.605377 0 0
23 Locked 38.983261 0 0
24 Locked 38.605377 0 0
25 Locked 37.636276 0 0
26 Locked 37.355988 0 0
27 Locked 37.636276 0 0
28 Locked 38.605377 0 0
29 Locked 38.605377 0 0
30 Locked 38.605377 0 0
31 Locked 38.605377 0 0
32 Locked 38.605377 0 0
on 09-07-2021 23:35
Upstream:
Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
1 53700000 39.500000 5120 KSym/sec 64QAM 6
2 39400000 39.000000 5120 KSym/sec 64QAM 8
3 60300000 39.750000 5120 KSym/sec 64QAM 5
4 46200000 39.000000 5120 KSym/sec 64QAM 7
3.0 Upstream channels
Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts
1 US_TYPE_STDMA 0 0 0 0
2 US_TYPE_STDMA 0 0 0 0
3 US_TYPE_STDMA 0 0 0 0
4 US_TYPE_STDMA 0 0 0 0
on 09-07-2021 23:42
That's not uncommon with both Upstream and DS SNR. Your forward levels should be between -6/+10 and SNR above 34. Return levels should be between 33-51 with SNR above 28 (ideally 32) but cant see US SNR from hub Data.
T3's are when Ranging Request Retries are Exhausted and can be caused by network issues or a faulty splitter or isolator. Check all connections are clean and tight and reboot the hub to clear counters. See what they are after 24 hours. Low numbers wont cause an issue so if there's no problems with service, i wouldn't worry
on 10-07-2021 00:01
Couldn't thank you enough for your help and that reassurance is all I was after.
So far my experience of VM has been overall poor (from CS) but the engineering resource VM have is amazing.
Its the staff like you which really do make a massive difference.
Have an amazing weekend and thanks so much again.
on 10-07-2021 00:04
That's ok, I'm pleased I could help. Thanks, have a great weekend as well