Hub 3 Status & Clarification

[Darkymcboaty]

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

[FlockWallpaper · Accepted solution]

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.

[Tudor]

Too many errors, but the figures are accumulative since the hub was last power cycled. So please turn off your hub for a short period, this will reset the counters, then post a new full set of stats after about two hours. This will indicate the current line status. Also your downstream power being low and the upstream being high tends to indicate you are possibly a long way from the street cabinet and could need moving to another tap. This would require a technician’s visit. 

[gitty]

Splitters affect signal levels. If the signal is split between multiple devices, before reaching the modem...

Removing (unnecessary) splits will increase the downstream power and decrease the upstream power.

[Kath_F]

Hi Darkymcboaty, 

Thanks for taking the time to contact us via the Community. It's lovely having you on board with us in the Forums. ⭐

We've had a closer look at the hub and stats this end and a few of your upstream channels are very slightly raised but not to the point where it was cause any issues really. 

Can you confirm how things are with your connection in general? Do you have any issues at all or just looking in to things to ensure there are no causes for concern?

Let us know so we can help further. 

Thanks,