Download speed consistently stuck at 90 on a connection that should be 300

[nigelx]

Good afternoon all.

My M350 connection has started to exhibit slow speeds. All speeds have been tested using Speedtest using a direct-wired ethernet connection.

Immediately following a reboot of the hub, I achieve speeds in line with my expectations - around 280 Down and 35 up.  After a short period of time though, the Down speed falls to a very consistent 90, with the up speeds unaffected.  The network log contains no events or errors of note and the upstream and downstream readings appear (to me at least) unremarkable.  I would appreciate any thoughts.

Downstream bonded channels

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

1	219000000	5.1	40	256 qam	11
2	203000000	6	40	256 qam	9
3	211000000	5.6	40	256 qam	10
4	227000000	4.6	40	256 qam	12
5	235000000	4	40	256 qam	13
6	243000000	4.1	40	256 qam	14
7	251000000	4.4	40	256 qam	15
8	259000000	4.6	40	256 qam	16
9	267000000	4.5	40	256 qam	17
10	275000000	4.5	40	256 qam	18
11	283000000	4.5	40	256 qam	19
12	291000000	4.8	40	256 qam	20
13	299000000	4.8	40	256 qam	21
14	307000000	5	40	256 qam	22
15	315000000	4.6	40	256 qam	23
16	323000000	4.3	40	256 qam	24
17	331000000	4.1	40	256 qam	25
18	339000000	3.9	40	256 qam	26
19	347000000	4	40	256 qam	27
20	355000000	3.7	40	256 qam	28
21	363000000	3.9	40	256 qam	29
22	371000000	3.7	40	256 qam	30
23	379000000	3.7	40	256 qam	31
24	387000000	3.4	40	256 qam	32

Downstream bonded channels

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

1	Locked	40.3	31	0
2	Locked	40.3	51	0
3	Locked	40.3	41	0
4	Locked	40.3	27	0
5	Locked	40.3	41	0
6	Locked	40.9	32	0
7	Locked	40.3	40	0
8	Locked	40.3	37	0
9	Locked	40.3	29	0
10	Locked	40.3	65	0
11	Locked	40.9	31	0
12	Locked	40.9	35	0
13	Locked	40.9	34	0
14	Locked	40.9	39	0
15	Locked	40.3	33	0
16	Locked	40.9	32	0
17	Locked	40.3	42	0
18	Locked	40.9	49	0
19	Locked	40.3	47	0
20	Locked	40.9	40	0
21	Locked	40.9	54	0
22	Locked	40.9	25	0
23	Locked	40.9	32	0
24	Locked	40.3	20	0

Upstream bonded channels

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

1	53700073	41.3	5120	64 qam	2
2	32600000	41.8	5120	64 qam	5
3	39400000	39.8	5120	64 qam	4
4	46200000	40.3	5120	64 qam	3

Upstream bonded channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

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

[jbrennand]

Post up the network logs too and start a BQM as below.

Have you tried a new Cat6 ethernet cable (old ones do fail)?
---------------------

If you haven’t already, set up a free and secure “Broadband Quality Monitor” to continually monitor the state of your connection and record any true network dropouts , latency issues, packet drops, etc - it will thus allow you to differentiate between those and simple wifi dropouts. It does it 24/7/365 and it keeps a visual record of any/all of your network disconnections, useful data to have to match to the Network logs (in your Hub settings) and also in discussions with VM - note it will take a few hours to start seeing a sensible picture - post up the “link” to the “share live graph” (as per instructions on the TB website) when it starts to develop.

https://www.thinkbroadband.com/broadband/monitoring/quality

[sophist · Accepted solution]

a speed of 90mb is usually indicative of a faulty cable  - it's possible that on reboot (of the hub) the device connected negotiates a speed of 1000mb but that over time it is unable to sustain this so drops back to 100mb.. which translates to the 90mb you're seeing.

try a different cable and see if that fixes it.

you should be able to see what speed your device thinks the connection is in the network status/properties somewhere (depending on device/operating system etc..)

[nigelx]

Thanks Sophist. I have swapped the cable (between the hub and my switch) and restarted. So far so good. I will report back with results.