1Gig Slow connection DOCSIS 3.1

[Ash_]

Hey all, IT/Software engineer here who has signed up for the 1gig package.

I was originally on the 250 MB package which as rock solid for years. Working from home more and uploading/downloading large virtual machine files required the upgrade. I took the plunge last week but the internet speed is very intermittent. 

Some days I can get 1180mbps down and 105 up and the next day it's 450mbps down and 45mb up. I have tried various connection methods including Wifi 6 enabled Macbook Pro, iPhone 14 and iPad. Additionally, I purchased a 2.5gig ethernet adaptor for my Mac thinking there might be congestion on the 2.4/5ghz range but it makes no real difference.

It's like something is going on at the exchange and it then sorts itself out a few hours later. 

I have had an engineer out who looked at everything and it was all over the place then. He replaced a few things and it was ok for a day and it's back doing the same. 

Is this normal for the 1gig connection as I am rarely seeing 1gb download and have only seen over 100mb upload two times. 

I have factory reset the router and also tried just my laptop connected but that makes no difference when it's being slow. 

Cable Modem StatusItem Status TypeChannel Overview Downstream Upstream

Cable Modem Status	Online	DOCSIS 3.0
Primary downstream channel	Locked	SC-QAM
DOCSIS 3.0 channels	31	5
DOCSIS 3.1 channels	1	1

3.0 Downstream channels

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

1	330000000	2.9	41	QAM 256	25
2	138000000	6.7	40	QAM 256	1
3	146000000	6.2	40	QAM 256	2
4	154000000	5.8	40	QAM 256	3
5	162000000	5.6	40	QAM 256	4
6	170000000	5.4	40	QAM 256	5
7	178000000	5.3	41	QAM 256	6
8	186000000	5.1	41	QAM 256	7
9	194000000	4.8	41	QAM 256	8
10	202000000	4.5	41	QAM 256	9
11	210000000	4.6	41	QAM 256	10
12	258000000	3.9	41	QAM 256	16
13	266000000	3.8	41	QAM 256	17
14	274000000	3.6	41	QAM 256	18
15	282000000	3.5	41	QAM 256	19
16	290000000	3.7	41	QAM 256	20
17	298000000	3.7	41	QAM 256	21
18	306000000	3.5	41	QAM 256	22
19	314000000	3.2	41	QAM 256	23
20	322000000	3.1	41	QAM 256	24
21	338000000	3.1	41	QAM 256	26
22	346000000	2.8	41	QAM 256	27
23	354000000	2.5	41	QAM 256	28
24	362000000	2.5	41	QAM 256	29
25	370000000	2.5	41	QAM 256	30
26	378000000	2.3	41	QAM 256	31
27	386000000	1.9	41	QAM 256	32
28	394000000	1.6	41	QAM 256	33
29	402000000	1.7	41	QAM 256	34
30	410000000	1.8	41	QAM 256	35
31	514000000	0.7	40	QAM 256	36

3.0 Downstream channels

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

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

3.1 Downstream channels

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

37

92

4K

1800

QAM 4096

1128

3.1 Downstream channels

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

37

Locked

41

0.3

102489048

0

3.0 Upstream channels

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

0	49600000	42.5	5120	QAM 64	1
1	43100000	41.8	5120	QAM 64	2
2	36600000	40.5	5120	QAM 64	3
3	30100000	39.5	5120	QAM 64	4
4	23600000	38.5	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	0	0
4	ATDMA	0	0	0	0

3.1 Upstream channels

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

6

10.4

38.5

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

General Configuration

Network accessMaximum Number of CPEsBaseline PrivacyDOCSIS ModeConfig file

Allowed

1

Enabled

3.1

cmreg-vmdg660-bbt076-b.cm

Primary Downstream Service Flow

SFIDMax Traffic RateMax Traffic BurstMin Traffic Rate

21894

1230000450 bps

42600bytes

0 bps

Primary Upstream Service Flow

SFIDMax Traffic RateMax Traffic BurstMin Traffic RateMax Concatenated BurstScheduling Type

21893

110000274 bps

42600bytes

0 bps

42600bytes

Best Effort

Any help would be much appreciated as the phone support seems to have no idea. 

[John_GS]

Hi @Ash_ 

Thanks for posting and welcome back to the community.

Apologies for any speed issues. 

I understand from the system check you have since spoke to the team and everything explained.

Do pop back if you need further assistance.

[jpeg1]

That 6dB slope on downstream levels from the lowest to the highest frequencies is certainly consistent with a failing outside cable.