Slow speed after upgrade to Gigabit

[adhawkins]

Hi all,

Upgraded to Gigabit yesterday. Barely getting 500 MBits/sec. Also, overnight our internet connection went down. It appeared that everything was connected (pfSense router reported it had an IP address, but no traffic being routed). Repowered the SuperHub, and it's back for now.

Superhub is in modem mode, with a pfsense router connected. All was previously fine when on 350M package, giving expected speeds up and down. Will post hub status in following messages.

[adhawkins]

3.0 Downstream channels

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

12	499000000	6.500000	40.366287	QAM256	12
1	411000000	5.400002	40.366287	QAM256	1
2	419000000	5.599998	38.605377	QAM256	2
3	427000000	5.699997	38.983261	QAM256	3
4	435000000	6.000000	38.605377	QAM256	4
5	443000000	6.199997	40.366287	QAM256	5
6	451000000	6.599998	40.366287	QAM256	6
7	459000000	6.199997	40.366287	QAM256	7
8	467000000	6.199997	40.366287	QAM256	8
9	475000000	6.000000	40.366287	QAM256	9
10	483000000	6.199997	40.366287	QAM256	10
11	491000000	6.300003	40.366287	QAM256	11
13	507000000	6.400002	40.366287	QAM256	13
14	515000000	6.500000	40.366287	QAM256	14
15	523000000	6.599998	40.366287	QAM256	15
16	531000000	6.800003	40.366287	QAM256	16
17	539000000	7.000000	40.366287	QAM256	17
18	547000000	7.099998	40.946209	QAM256	18
19	555000000	7.099998	40.366287	QAM256	19
20	563000000	7.300003	40.366287	QAM256	20
21	571000000	7.400002	40.366287	QAM256	21
22	579000000	7.400002	40.366287	QAM256	22
23	587000000	7.400002	40.946209	QAM256	23
24	595000000	7.699997	40.366287	QAM256	24
25	603000000	7.900002	40.366287	QAM256	25
26	611000000	7.800003	40.366287	QAM256	26
27	619000000	7.800003	40.366287	QAM256	27
28	627000000	7.400002	40.366287	QAM256	28
29	635000000	7.300003	40.366287	QAM256	29
30	643000000	6.900002	40.366287	QAM256	30
31	651000000	7.000000	40.946209	QAM256	31

3.0 Downstream channels

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

12	Locked	40.366287	7	0
1	Locked	40.366287	6	0
2	Locked	38.605377	0	0
3	Locked	38.983261	0	0
4	Locked	38.605377	0	0
5	Locked	40.366287	0	0
6	Locked	40.366287	0	0
7	Locked	40.366287	0	0
8	Locked	40.366287	0	0
9	Locked	40.366287	0	0
10	Locked	40.366287	0	0
11	Locked	40.366287	1	0
13	Locked	40.366287	7	0
14	Locked	40.366287	0	0
15	Locked	40.366287	7	0
16	Locked	40.366287	0	0
17	Locked	40.366287	0	0
18	Locked	40.946209	0	0
19	Locked	40.366287	0	0
20	Locked	40.366287	0	0
21	Locked	40.366287	0	0
22	Locked	40.366287	0	0
23	Locked	40.946209	0	0
24	Locked	40.366287	0	0
25	Locked	40.366287	6	0
26	Locked	40.366287	7	0
27	Locked	40.366287	6	0
28	Locked	40.366287	1	0
29	Locked	40.366287	0	0
30	Locked	40.366287	1	0
31	Locked	40.946209	0	0

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

41

96

4K

1880

QAM4096

728

3.1 Downstream channelsChannel ID Lock Status RxMER Data (dB) PLC Power (dBmV) Correcteds (Active Profile) Uncorrectables (Active Profile)

41

Locked

42

5.1

71272

0

[adhawkins]

3.0 Upstream channels

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

1	32600000	42.520599	5120 KSym/sec	64QAM	9
2	53700000	42.770599	5120 KSym/sec	64QAM	6
3	46200000	42.520599	5120 KSym/sec	64QAM	7
4	39400000	42.520599	5120 KSym/sec	64QAM	8

3.0 Upstream channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

1	US_TYPE_STDMA	0	0	1	0
2	US_TYPE_STDMA	0	0	0	0
3	US_TYPE_STDMA	0	0	0	0
4	US_TYPE_STDMA	0	0	0	0

[adhawkins]

General Configuration

Network access	true
Maximum Number of CPEs	1
Baseline Privacy	true
DOCSIS Mode	3.1
Config file	cmreg-vmdg640-bbt076-b.cm

Primary Downstream Service Flow

SFID	61558
Max Traffic Rate	1230000450
Max Traffic Burst	42600
Min Traffic Rate	0

Primary Upstream Service Flow

SFID	61557
Max Traffic Rate	55000270
Max Traffic Burst	42600
Min Traffic Rate	0
Max Concatenated Burst	42600
Scheduling Type	bestEffort

[adhawkins]

Network Log

Time Priority Description

Thu Jan 1 00:01:19 1970	4	Missing Mandatory MDD TLV on primary DS Channel;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Thu Jan 1 00:01:52 1970	3	No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Thu Oct 7 14:41:21 2021	5	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Thu Oct 7 14:44:27 2021	6	SW Download INIT - Via Config file cmreg-vmdg640-bbt076-b.cm
Thu Oct 7 14:45:41 2021	6	SW download Successful - Via Config file
Thu Oct 7 14:48:12 2021	5	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Thu Oct 7 14:56:19 2021	5	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Thu Oct 7 14:56:25 2021	6	CM-STATUS message sent. Event Type Code: 5; Chan ID: 41; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Thu Oct 7 15:02:44 2021	5	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Thu Oct 7 15:21:50 2021	4	DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Thu Jan 1 00:01:21 1970	3	No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Fri Oct 8 06:27:38 2021	5	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Fri Oct 8 06:27:48 2021	5	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Fri Oct 8 06:28:03 2021	6	CM-STATUS message sent. Event Type Code: 4; Chan ID: 41; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;

[adhawkins]

[Andrew-G]

Very low error counts suggest the hub had been restarted shortly before the status data was taken.  It's usually best to post status data after a good few hours of run time (somewhere in the 12-48 hour range), because after a restart the hub erases all error counters, and the channels are freshly negotiated and may not be representative of the state they drift into if there's noise or power issues.  Having 1 Gbps is much more demanding of line quality than slower speeds, it's quite possible that any underlying issue existed before, but are only apparent now. 

I do observe that the power levels slope the wrong way (potentially an incorrectly setup amplifier in a street cabinet), but can't say whether the extent of that slope issue is great enough to cause speed problems.  DOCSIS is like most analogue technologies (for the most part) a pretty fault tolerant system, but at 1 Gbps any minor issues that don't affect lower speeds can crawl out of the woodwork.  

If you haven't already, could be worth undoing, wiping and remaking all coax joints with any nuts secured finger tight, checking cables for pinch or crush damage, and that all coax is VM supplied, and if there's a brown omnibox on the outside property wall, opening that and doing the same with the coax joints in that.  

[adhawkins]

Hi,

Yes, that data was posted about an hour after the hub was restarted to fix the problem that occurred overnight. I'll monitor the error counts, and post again later today.

Thanks for the advice regarding checking connections etc., will do that.

Andy

[adhawkins]

Ok, it's been running about 36 hours or so now. New results:

3.0 Downstream channels

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

12	499000000	6.599998	40.366287	QAM256	12
1	411000000	5.400002	40.366287	QAM256	1
2	419000000	5.599998	38.983261	QAM256	2
3	427000000	5.800003	38.983261	QAM256	3
4	435000000	6.000000	38.983261	QAM256	4
5	443000000	6.199997	40.366287	QAM256	5
6	451000000	6.699997	40.366287	QAM256	6
7	459000000	6.300003	40.366287	QAM256	7
8	467000000	6.300003	40.946209	QAM256	8
9	475000000	6.099998	40.366287	QAM256	9
10	483000000	6.400002	40.366287	QAM256	10
11	491000000	6.400002	40.366287	QAM256	11
13	507000000	6.500000	40.366287	QAM256	13
14	515000000	6.599998	40.366287	QAM256	14
15	523000000	6.800003	40.366287	QAM256	15
16	531000000	6.900002	40.366287	QAM256	16
17	539000000	7.099998	40.366287	QAM256	17
18	547000000	7.099998	40.366287	QAM256	18
19	555000000	7.300003	40.366287	QAM256	19
20	563000000	7.500000	40.946209	QAM256	20
21	571000000	7.599998	40.366287	QAM256	21
22	579000000	7.800003	40.366287	QAM256	22
23	587000000	7.599998	40.366287	QAM256	23
24	595000000	7.800003	40.366287	QAM256	24
25	603000000	8.000000	40.946209	QAM256	25
26	611000000	7.800003	40.946209	QAM256	26
27	619000000	7.800003	40.366287	QAM256	27
28	627000000	7.400002	40.366287	QAM256	28
29	635000000	7.300003	40.366287	QAM256	29
30	643000000	7.000000	40.366287	QAM256	30
31	651000000	7.099998	40.366287	QAM256	31

3.0 Downstream channels

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

12	Locked	40.366287	0	0
1	Locked	40.366287	0	0
2	Locked	38.983261	0	0
3	Locked	38.983261	0	0
4	Locked	38.983261	0	0
5	Locked	40.366287	0	0
6	Locked	40.366287	0	0
7	Locked	40.366287	0	0
8	Locked	40.946209	0	0
9	Locked	40.366287	1	0
10	Locked	40.366287	0	0
11	Locked	40.366287	0	0
13	Locked	40.366287	0	0
14	Locked	40.366287	2	0
15	Locked	40.366287	0	0
16	Locked	40.366287	0	0
17	Locked	40.366287	0	0
18	Locked	40.366287	0	0
19	Locked	40.366287	1	0
20	Locked	40.946209	0	0
21	Locked	40.366287	0	0
22	Locked	40.366287	1	0
23	Locked	40.366287	0	0
24	Locked	40.366287	1	0
25	Locked	40.946209	2	0
26	Locked	40.946209	1	0
27	Locked	40.366287	2	0
28	Locked	40.366287	2	0
29	Locked	40.366287	1	0
30	Locked	40.366287	2	0
31	Locked	40.366287	1	0

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

41

96

4K

1880

QAM4096

728

3.1 Downstream channelsChannel ID Lock Status RxMER Data (dB) PLC Power (dBmV) Correcteds (Active Profile) Uncorrectables (Active Profile)

41

Locked

42

5.3

328924711

0

[adhawkins]

3.0 Upstream channels

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

1	32600000	42.770599	5120 KSym/sec	64QAM	9
2	53700000	43.270599	5120 KSym/sec	64QAM	6
3	46200000	42.770599	5120 KSym/sec	64QAM	7
4	39400000	42.770599	5120 KSym/sec	64QAM	8

3.0 Upstream channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

1	US_TYPE_STDMA	0	0	1	0
2	US_TYPE_STDMA	0	0	0	0
3	US_TYPE_STDMA	0	0	0	0
4	US_TYPE_STDMA	0	0	0	0