Slow speeds on Gig1

[TerryUK]

Hello,

My speeds used to be fine since Virgin come out about a year ago to run a new cable, although I noticed the last week or so I am getting less than 300mbps. Can someone check my figures to see if something is out?

3.0 Downstream channels

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

1	331000000	3.9	41	QAM 256	25
2	155000000	3.6	39	QAM 256	3
3	163000000	3.6	40	QAM 256	4
4	171000000	3.9	40	QAM 256	5
5	179000000	3.6	40	QAM 256	6
6	187000000	3.8	40	QAM 256	7
7	195000000	4.1	40	QAM 256	8
8	203000000	4.2	40	QAM 256	9
9	211000000	4.4	40	QAM 256	10
10	219000000	4.2	34	QAM 256	11
11	227000000	4.1	40	QAM 256	12
12	235000000	3.6	40	QAM 256	13
13	243000000	3.6	40	QAM 256	14
14	251000000	3	40	QAM 256	15
15	259000000	2.8	40	QAM 256	16
16	267000000	3.4	41	QAM 256	17
17	275000000	3.9	41	QAM 256	18
18	283000000	4.3	41	QAM 256	19
19	291000000	4.1	41	QAM 256	20
20	299000000	4.3	41	QAM 256	21
21	307000000	4.1	41	QAM 256	22
22	315000000	4.2	42	QAM 256	23
23	323000000	4.2	41	QAM 256	24
24	339000000	4.3	40	QAM 256	26
25	347000000	4.1	41	QAM 256	27
26	355000000	4.1	42	QAM 256	28
27	363000000	3.8	42	QAM 256	29
28	371000000	4	42	QAM 256	30
29	379000000	3.9	42	QAM 256	31
30	387000000	3.9	42	QAM 256	32
31	395000000	3.8	42	QAM 256	33

3.0 Downstream channels

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

1	Locked	41	12	0
2	Locked	39	12	0
3	Locked	40	16	0
4	Locked	40	7	0
5	Locked	40	23	0
6	Locked	40	16	0
7	Locked	40	14	0
8	Locked	40	18	0
9	Locked	40	16	0
10	Locked	34	82654	169
11	Locked	40	38	0
12	Locked	40	18	0
13	Locked	40	12	0
14	Locked	40	12	0
15	Locked	40	19	0
16	Locked	41	14	0
17	Locked	41	14	0
18	Locked	41	10	0
19	Locked	41	8	0
20	Locked	41	10	0
21	Locked	41	14	0
22	Locked	42	5	0
23	Locked	41	11	0
24	Locked	40	19	0
25	Locked	41	11	0
26	Locked	42	19	0
27	Locked	42	14	0
28	Locked	42	18	0
29	Locked	42	14	0
30	Locked	42	22	0
31	Locked	42	11	0

3.1 Downstream channels

Channel Channel Width (MHz) FFT Type Number of Active Subcarriers Modulation (Active Profile) First Active Subcarrier (Hz)

37

94

4K

1840

QAM 4096

1108

3.1 Downstream channels

Channel ID Locked Status RxMER Data (dB) PLC Power (dBmV) Corrected errors (Active Profile) Uncorrectable errors (Active Profile)

37

Locked

40

-1.3

293838704

53

Speed tests were carried out from my router hardwired into the modem.

[Cardiffman282]

DS channels 10 and 37 are struggling with errors. What are your upstream channels showing?

Check for local faults on 0800 561 0061 and ensure all cables and connections are tight and in good condition. 

[TerryUK]

That's what I was thinking it might be something up with those channels. Upstream is as follows:

3.0 Upstream channels

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

0	49600000	44.5	5120	QAM 64	1
1	43100000	44.3	5120	QAM 64	2
2	36600000	44.3	5120	QAM 64	3
3	30100000	43.8	5120	QAM 64	4
4	23600000	43.8	5120	QAM 64	5

3.0 Upstream channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

0	ATDMA	0	0	0	0
1	ATDMA	0	0	0	0
2	ATDMA	0	0	0	0
3	ATDMA	0	0	48	0
4	ATDMA	0	0	0	0

3.1 Upstream channels

Channel Channel Width (MHz) Power (dBmV) FFT Type Modulation

6

10.4

39.7

2K

QAM 256

3.1 Upstream channels

Channel Channel Type Number of Active Subcarriers First Active Subcarrier (Hz) T3 Timeouts T4 Timeouts

6

OFDMA

208

74000000

0

0

[Cardiffman282]

Lots of T3 errors on US channel 3. Otherwise largely okay. What does the phone line I gave say? 

[Go1dy]

Is this via hardwired Ethernet or WiFi?

I think the 1Gb router spits out 2.4G and 5G, have you turned off 2.4G in the router setting so it’s all 5G?  You’ll never get 1Gb on WiFi on most devices.  My iPhone15 only gets about 850Mb max

[gitty]

Is the hub in router mode, so you can let it do a samknows speed test?

[TerryUK]

Phone line says no issues in area. I am using a 3rd party router to the Virgin hub which is in modem mode. Unfortunately It's a bit of a pain to switch the hub from modem mode to router mode to do a Sam Knows test. The speeds I am getting are from the routers speed test which is hardwired to the modem. As I said in the original post, everything has been fine for a while and nothing has changed on my side so I know the setup on my side does work at full speeds, something appears to have changed though.

[Adduxi]

VM will insist on the Hub being in Router mode before they will do any troubleshooting. You should also do the SamKnows speed test as VM will most likely ask for it anyway.  You can go back to modem mode once you have run the speed test.