G.Fast keeps dropping

[Jonkarra]

I've had gfast for about 6 months and its been great until about a month ago.  The line keeps disconnecting, ringing 17070 and just listening to the blurb seems to force it back up OK. Its an old handset but the line does sound a little noisy. Line speed is fine though. Stats from the smarthub 2 :-

Product code:Smart Hub 2

Serial number:+091301+1938024861

Firmware version:v0.17.01.12312-BT

Firmware updated:Tue Jun 30 20:20:44 2020

Board version:R01

GUI version:1.56 15_02_2019

DSL uptime:0 days,00 Hours05 Mins06 Secs

Data rate:49.135 Mbps / 329.083 Mbps

Maximum data rate:52.203 Mbps / 511.041 Mbps

Noise margin:10.5 / 13.0

Line attenuation:0.0 / 25.2

Signal attenuation:0.0 / 25.2

VLAN id:101

Upstream error control:Off

Downstream error control:Off

Data sent / received:4.0 MB Uploaded  / 17.2 MB Downloaded

Nothing obvious in the event log either :-

19:52:48, 31 Aug.

WAN Sensing Auto sensing Complete, interface selected

19:52:48, 31 Aug.

WAN Sensing Auto sensing Running

19:52:47, 31 Aug.

WAN IPv6 Global unicast prefix / length: 

19:52:47, 31 Aug.

WAN IPv6 Global unicast address allocated: 

19:52:47, 31 Aug.

WAN DHCPv6 events: BOUND

19:52:47, 31 Aug.

WAN Sensing Auto sensing Complete, interface selected

19:52:46, 31 Aug.

WAN Sensing Auto sensing Running

19:52:46, 31 Aug.

Success - secondary DNS servers

19:52:46, 31 Aug.

Success - primary DNS servers

19:52:46, 31 Aug.

WAN connection WAN2_INTERNET_PTM connected

19:52:46, 31 Aug.

WAN DHCPv6 events: INIT

19:52:31, 31 Aug.

DSL Link Up: Down Rate=329083kbps, Up Rate=49135kbps; SNR Margin Down=12.9dB, Up=10.4dB

19:52:23, 31 Aug.

WAN Auto-sensing detected port DSL WAN

19:50:55, 31 Aug.

WAN Sensing Auto sensing Complete, interface selected

19:50:55, 31 Aug.

WAN Sensing Auto sensing Running

19:50:53, 31 Aug.

WAN Sensing Auto sensing Complete, interface selected

19:50:53, 31 Aug.

WAN Sensing Auto sensing Running

19:50:53, 31 Aug.

WAN connection WAN2_INTERNET_PTM disconnected.[ERROR_NO_CARRIER]

19:50:51, 31 Aug.

DSL Link Down: duration was 65 seconds

Any ideas appreciated...

[imjolly]

if you can hear any noise on quiet line test then you need to report a phone fault and get it fixed

[Keith_Beddoe]

@Jonkarra 

Probably a high resistance connection. especially if you do not use your phone very often.

Passing a current through the line, usually fixes the problem for a while. Even better, ringing the home phone from a mobile and letting it ring for about 20 seconds before answering, works best. The incoming ring is a high voltage, and also operates a number of mechanical bypass relays on the fibre cabinet port.

High resistance connections can be caused by bad joints, or relay contacts which have become "dry".

https://en.wikipedia.org/wiki/Dry_contact

[oakserver]

That's interesting @Keith_Beddoe. I believe this might explain the problems I reported on these forums while ago that I had crackle on the line, but only occasionally and is resolved by disconnecting and reconnecting the telephone from the socket and making a few calls etc. I've changed the cables, and now just changed the phone as well this month, just in case but still get occasional disconnects (seems a little more regular now ).

As I can go days without a disconnect I haven't worried too much about it, and it would be difficult for the engineer to find I suppose if its only intermittent.