Virgin Media Community

[ThatCoffeeGuy]

Hi there just want to make sure my power levels are ok as they seem a bit high and I’m experiencing very high ping and jitter on speed tests and many of my games pleas find below a pasting of the power levels 

Downstream bonded channels

Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID

1	331000000	14	40	256 qam	25
2	251000000	13.1	40	256 qam	15
3	259000000	13.3	40	256 qam	16
4	267000000	13	40	256 qam	17
5	275000000	13.3	38	256 qam	18
6	283000000	13.8	40	256 qam	19
7	291000000	13.9	40	256 qam	20
8	299000000	14	40	256 qam	21
9	307000000	14.1	40	256 qam	22
10	315000000	14.4	40	256 qam	23
11	323000000	14.3	40	256 qam	24
12	339000000	14	40	256 qam	26
13	347000000	14.3	40	256 qam	27
14	355000000	14	40	256 qam	28
15	363000000	13.6	40	256 qam	29
16	371000000	13.5	40	256 qam	30
17	379000000	13.5	40	256 qam	31
18	387000000	13.8	40	256 qam	32
19	395000000	13.5	40	256 qam	33
20	403000000	13.1	40	256 qam	34
21	411000000	13.3	40	256 qam	35
22	419000000	13.3	40	256 qam	36
23	427000000	13	40	256 qam	37
24	435000000	12.5	40	256 qam	38

[conman33158]

Your power levels are way too high and your SNR is a bit on the high side as well. Have you checked for any ongoing issues in your area? If no issues in your area you will need an engineers visit to put these right. Best to ring VM on or just after 8am or alternatively you can wait here for a Virgin staff member to pick it up, typically between 5-10 days, sometimes sooner, sometimes later depending on how busy they are.

Try not to bump the thread as this will throw you further down the list

[gitty]

Regarding SNR: It cannot be on the high side. High is better, so there is no upper limit.

[conman33158]

---

@gitty wrote:
Regarding SNR: It cannot be on the high side. High is better, so there is no upper limit.

---

Your right mate, too early, haven't had my coffee yet 🙂

[ThatCoffeeGuy]

Thanks a lot I thaught I was a little high could this be why my jitter and latency is so high sometimes 

• I shall get on to virgin today and see if their is any problems in my area also my upstream is below just to see if that’s bad or good

Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID

1	39400000	34	5120	64 qam	6
2	25799981	34	5120	64 qam	8
3	32599986	34	5120	64 qam	7
4	46200000	34	5120	64 qam	5

[conman33158]

Yeah mate, the high power levels would certainly cause some problems. Upstream looks fine, all on 64 QAM where they should be.

[sayekm]

The upstream power seems very low. They should be above 40 to 45 ideally.

Also its always good idea to keep a backup 6db forward path attenuator. My downstream power was around 7 in summer but in winter suddenly jumped to 10+. Sudden big jump but fitting the 6db attenuator brought the level down to desirable level.  

Your other option is very long wait for engineer to come round and fit a attenuator 🙂

https://www.ebay.co.uk/itm/FORWARD-PATH-ATTENUATORS-3DB-6-DB-10DB-15-DB-07950-600696/274670744148?ha...

[Adduxi]

---

@sayekm wrote:

<snip>

Also its always good idea to keep a backup 6db forward path attenuator. My downstream power was around 7 in summer but in winter suddenly jumped to 10+. Sudden big jump but fitting the 6db attenuator brought the level down to desirable level.  

---

With a jump that big the cynic in me would say your tap point was moved in the Cabinet.  I had a similar jump not so long ago, I also used an FPA to adjust.

[ThatCoffeeGuy]

Thanks to your guys recommendations I have baught some fpas and they Are arriving today so I shall update on what happens 

[ThatCoffeeGuy]

New power levels 

Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID

1	395000000	-1.7	38	256 qam	33
2	251000000	-3	38	256 qam	15
3	259000000	-2.2	38	256 qam	16
4	267000000	-2.7	38	256 qam	17
5	275000000	-2.7	38	256 qam	18
6	283000000	-1.5	38	256 qam	19
7	291000000	-2.4	38	256 qam	20
8	299000000	-0.5	40	256 qam	21
9	307000000	-1.9	38	256 qam	22
10	315000000	-0.9	38	256 qam	23
11	323000000	-1.7	38	256 qam	24
12	331000000	-1.2	38	256 qam	25
13	339000000	-0.9	38	256 qam	26
14	347000000	-1.5	38	256 qam	27
15	355000000	-1	38	256 qam	28
16	363000000	-2.2	38	256 qam	29
17	371000000	-1	40	256 qam	30
18	379000000	-2.2	38	256 qam	31
19	387000000	-1.5	38	256 qam	32
20	403000000	-2.2	38	256 qam	34
21	411000000	-2	38	256 qam	35
22	419000000	-3	38	256 qam	36
23	427000000	-1.9	40	256 qam	37
24	435000000	-2.5	38	256 qam	38

Downstream bonded channels

Channel Locked Status RxMER (dB) Pre RS Errors