Yea cheers i always pay abit extra for decent cables

Well this is bizarre. Testing on ethernet gets those results i posted. Testing on wifi gets my 8Mbps upload (same download)

Its a short Ethernet cable from the router to the PC so not sure why wifi would be giving faster results?

Edited by bobble_bob (Tue 29-Aug-23 11:31:02)

So at least the link is fine.


Also, the cable I linked to is quick small and discreet - not as chunky as full Cat5/5E.

Yea will look into that cheers.

Doing multiple tests on multiple devices, download is fine and consistent. Upload that is odd. I think the upload is an issue with the thinkbroadband test when on ethernet

PC wired - thinkbroadband i get 5-5.5mbps. On the OOkla speedtest (single thread same as thinkbroadband) i get 9mbps

PS5 reporting 8-8.5mbps
Iphone and Android on thinkbroadband (wifi) get 8-9mbps

So the only anomaly is thethinkbroadband test wired

@realalemadrid, found some other stats that may help.

Connection Speed 39994 kbps 9997 kbps
Line Attenuation D0( 12.5) D1( 31.6) D2( 50.1) dB U0( 4.1) U1( 25.3) U2( 39.1) U3(N/A) U4(N/A) dB
Noise Margin D0( 9.5) D1( 9.4) D2( 9.4) dB U0( 12.5) U1( 10.2) U2( 10.3) U3(N/A) U4(N/A) dB

Thats all the D6400 lists. Overall those now i know the upstream is getting full speeds despite what the speedtest wired suggests, im happy

If the cabling were causing slowness, then it would show in the sync speed.

Yea i thought that, but as i mentioned further down i dont think the speed is being effected. All tests ive done apart from the thinkbroadband wired test show a upstream speed in excess of 8Mbps

That is what I always believed - but I can remember changing the cable for someone with a downstream issue and whilst sync remained much the same, throughput improved. Cannot explain exactly why, it just did and replacing the original dropped throughput.

I think if there is interference caused by a poor cable it might. There could be enough that the data isnt getting through and you have dropped packets, but not enough to lose sync.

So since getting connected on Tues morning my connection been flawless. Syncing a max rate for a 38/10 service and speedtest maxing out (apart from the thinkbroadband wired on the upstream but wifi its fine)

I did read that the DLM sets your profile to open for a few days, and on the 2nd night it then tinkers will your line depending on how its behaving. So checked this morning of the 2nd night and indeed got a resync around 1.30am. My new line stats:

Speed40000 kbps9997 kbps
Line AttenuationD0( 12.5) D1( 31.6) D2( 49.9) dBU0( 4.1) U1( 25.3) U2( 39.0) U3(N/A) U4(N/A) dB
Noise MarginD0( 12.8) D1( 12.8) D2( 12.8) dBU0( 9.9) U1( 10.1) U2( 10.1) U3(N/A) U4(N/A) dB

So pretty much identical from my last stats apart from the SNR on the downstream has jumped up 3db roughly. Speedtests still all showing max speed. I thought maybe has the DLM turned interleaving on, but pings are now 7ms compared to 14ms before the resync

Unfortunately the D6400 router doesnt display errored seconds etc. So is a resync on the 2nd night normal, and what's the DLM actually done?

Edited by bobble_bob (Thu 31-Aug-23 06:56:32)

Which ISP is it?

The resync on your line may have caused your PPPoE session to reconnect and terminate on a different BRAS at the ISP.