Virgin Media Community

[enayzed]

I recently self-installed Gig1 in my new home and noticed that compared to my VDSL connection, the ping is double and jitter is higher, particularly on downstream. Upstream performance is better than VDSL. I'm wondering if this could be due to contention, and if so, would both upstream and downstream be affected?

I've also looked into power levels but am unsure how to interpret them. There are a few marginal levels and the variance isn't too significant. Here are the power levels for reference:

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

1	331000000	-6.2	39	QAM 256	25
2	139000000	-3.1	39	QAM 256	1
3	147000000	-3.3	39	QAM 256	2
4	155000000	-3.5	38	QAM 256	3
5	163000000	-3.7	38	QAM 256	4
6	171000000	-3.8	39	QAM 256	5
7	179000000	-4.5	39	QAM 256	6
8	187000000	-4.5	39	QAM 256	7
9	195000000	-4.3	39	QAM 256	8
10	203000000	-4.6	39	QAM 256	9
11	211000000	-4.7	39	QAM 256	10
12	219000000	-5.1	33	QAM 256	11
13	227000000	-5.5	38	QAM 256	12
14	235000000	-5.4	39	QAM 256	13
15	243000000	-5.7	39	QAM 256	14
16	251000000	-5.9	39	QAM 256	15
17	259000000	-6.1	39	QAM 256	16
18	267000000	-6.3	39	QAM 256	17
19	275000000	-6.1	39	QAM 256	18
20	283000000	-6.1	39	QAM 256	19
21	291000000	-5.7	39	QAM 256	20
22	299000000	-5.7	39	QAM 256	21
23	307000000	-6.1	39	QAM 256	22
24	315000000	-5.7	39	QAM 256	23
25	323000000	-6.3	39	QAM 256	24
26	339000000	-5.9	39	QAM 256	26
27	347000000	-5.9	39	QAM 256	27
28	355000000	-6	39	QAM 256	28
29	363000000	-6.1	39	QAM 256	29
30	371000000	-6.2	39	QAM 256	30
31	379000000	-6	39	QAM 256	31

Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors

1	Locked	39	0	0
2	Locked	39	638	124
3	Locked	39	103	5
4	Locked	38	126	13
5	Locked	38	185	11
6	Locked	39	155	1
7	Locked	39	79	13
8	Locked	39	85	1
9	Locked	39	60	0
10	Locked	39	25	10
11	Locked	39	5	0
12	Locked	33	49429	10
13	Locked	38	38	2
14	Locked	39	32	1
15	Locked	39	24	1
16	Locked	39	12	0
17	Locked	39	9	0
18	Locked	39	19	0
19	Locked	39	7	0
20	Locked	39	4	0
21	Locked	39	0	0
22	Locked	39	3	0
23	Locked	39	0	0
24	Locked	39	0	0
25	Locked	39	0	0
26	Locked	39	0	0
27	Locked	39	0	0
28	Locked	39	0	0
29	Locked	39	0	0
30	Locked	39	0	0
31	Locked	39	48	0

 The previous owner had multiple TV connections, so there are several splitters and open wall points. I plan to disconnect the splitters tomorrow and retest. However, if the issue persists, what can be done to improve ping and jitter on my Gig1 connection?

[Client62]

Gig 1 with mixed mode DOCSIS does have higher latency and jitter than FTTC / VDSL but also more raw bandwidth.

When removing splitters keep a careful eye on the changes to the Downstream and Upstream power levels, each splitter might have at least 4dB of signal loss, so for each removed the DS Power levels and SNR will rise & the US Power level will reduce.

As a guide refer to the section on optimum signal levels ...

https://pickmymodem.com/signal-levels-docsis-3-03-1-cable-modem/

[Fastlane256]

Hi @enazyzed. 

it might be useful to set up a BQM to map the latency, as virgin normally require these if action is required. 

You can do that here: https://www.thinkbroadband.com/broadband/monitoring/quality

You may have to change some settings in the hub to make this work to make sure IMCP is not blocked. There are guides on how to do this on thinkbroadband’s website.  

If you are still having an issue, I’ll flag it to the staff. 

[enayzed]

Thank you for your reply, so I remove two splitters and you are right the power levels went up, the SNR stayed the same and the overall performance of the connection latency and jitter stayed the same. I am going to put it down to as you say the underlying technology and maybe a bit of oversubscription in the area. 

I am still in my cooling of period so I have called to cancel for now. 

Channel	Frequency (Hz)	Power (dBmV)	SNR (dB)	Modulation	Channel ID
1	331000000	-2.4	39	QAM 256	25
2	139000000	0.7	39	QAM 256	1
3	147000000	0.9	39	QAM 256	2
4	155000000	0.4	39	QAM 256	3
5	163000000	0.2	39	QAM 256	4
6	171000000	0.3	39	QAM 256	5
7	179000000	0.5	39	QAM 256	6
8	187000000	0.4	39	QAM 256	7
9	195000000	0.4	39	QAM 256	8
10	203000000	0.4	39	QAM 256	9
11	211000000	0.7	39	QAM 256	10
12	219000000	0.9	32	QAM 256	11
13	227000000	-1.7	38	QAM 256	12
14	235000000	-1.2	39	QAM 256	13
15	243000000	-1.9	39	QAM 256	14
16	251000000	-1.9	39	QAM 256	15
17	259000000	-2.1	39	QAM 256	16
18	267000000	-2.3	39	QAM 256	17
19	275000000	-1.9	39	QAM 256	18
20	283000000	-2.1	39	QAM 256	19
21	291000000	-1.5	40	QAM 256	20
22	299000000	-1.9	39	QAM 256	21
23	307000000	-1.6	40	QAM 256	22
24	315000000	-2	39	QAM 256	23
25	323000000	-2.1	40	QAM 256	24
26	339000000	-1.8	40	QAM 256	26
27	347000000	-2.3	40	QAM 256	27
28	355000000	-2.2	40	QAM 256	28
29	363000000	-2.2	40	QAM 256	29
30	371000000	-2.3	40	QAM 256	30
31	379000000	-2.1	40	QAM 256	31

Downstream bonded channels

Channel	Locked Status	RxMER (dB)	Pre RS Errors	Post RS Errors
1	Locked	39	694	1299
2	Locked	39	16015	256
3	Locked	39	39069	1056
4	Locked	39	30068	1406
5	Locked	39	41746	1277
6	Locked	39	30444	543
7	Locked	39	31465	317
8	Locked	39	26671	1037
9	Locked	39	28922	961
10	Locked	39	2837	936
11	Locked	39	1708	919
12	Locked	32	36311	1726
13	Locked	38	131	2610
14	Locked	39	723	1636
15	Locked	39	677	1290
16	Locked	39	575	1030
17	Locked	39	381	541
18	Locked	39	347	504
19	Locked	39	476	562
20	Locked	39	492	609
21	Locked	40	684	1098
22	Locked	39	679	1229
23	Locked	40	719	1670
24	Locked	39	749	1556
25	Locked	40	618	1175
26	Locked	40	169	280
27	Locked	40	238	259
28	Locked	40	45	145
29	Locked	40	585	1197
30	Locked	40	564	904
31	Locked	40	1495	1441

[Paul_DN]

Hi enayzed,

Thank you for reaching out to us in our community and welcome back, it has been a while, sorry to hear you are facing high ping and jitter, I was unable to locate you on our system with the details we have for you, so I can help and have a look at things our end I will send you an invite into a private chat, once received please click on the purple envelope to accept.

Regards

Paul.

[Paul_DN]

Hi enayzed,

Thank you for joining me in a private chat, sorry to hear you have now cancelled due to the issues you are facing, we wish you all the luck and hope you may consider returning in the future, apologies again for any inconvenience caused.

Regards

Paul.