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"Loss of signal" failures? - Issue ?

Posts: 18
Registered: ‎22-10-2007

"Loss of signal" failures? - Issue ?



I was wondering if a GEA test might reveal anything about why I'm suddenly seeing 'LOS Failures' on my fibre connection - 4 in the last 24 hours so far I believe.

I've only had fibre for a fairly short period and the connection started off being 66/14 with a considerable number of errors (e.g. ES & FECS) on both up & downstream.

Inexplicably the downstream errors simply stopped after approx. 3 weeks and since then after the SNR margin was dropped from 6dB to 3dB - presumably by DLM is now 70/14 - which isn't too bad at all - although the upstream is only just meeting the BT estimate for the line and the errors continue on that - see the attachment for details.

I'm just concerned over the signal loss and where it might be being caused - if it's my side I'll go through the wiring again but I believe it's pretty clean to start with (no extensions, etc, single filtered master socket). I was hoping the GEA test might reveal this?


Any suggestions gratefully received!



Plusnet Help Team
Plusnet Help Team
Posts: 10,104
Thanks: 3,195
Fixes: 508
Registered: ‎21-04-2017

Re: "Loss of signal" failures? - Issue ?

Hi Ian,


Our tests aren't picking anything up.


Test Outcome Pass
Test Outcome Code GTC_FTTC_SERVICE_0003
Description No problem found, OAM test is not currently supported on this line.
Main Fault Location OK
Sync Status In Sync
Downstream Speed 66.7 Mbps
Upstream Speed 14.1 Mbps
Appointment Required N
Fault Report Advised N
NTE Power Status PowerOn
Voice Line Test Result Pass
Bridge Tap Not Detected
Radio Frequency Ingress Not Detected
Repetitive Electrical Impulse Noise Not Detected
Cross Talk Not Detected
Estimated Line Length In Metres 721.1
Upstream Rate Assessment Very Good
Downstream Rate Assessment Very Good
Interference Pattern Not Detected
Service Impact No Impact Observed
Home Wiring Problem Not Detected
Downstream Policing Discard Rate 0.0
Customer Traffic Level Upstream and Downstream Traffic Detected
Technology VDSL
Current 15Min Bin Retrains 0
Last 15Min Bin Retrains 0
Profile Name 0.128M-80M Downstream 4dB, Retransmission High - 0.128M-20M Upstream, Error Protection Off
Time Stamp 2017-08-17T17:15:00
Parameters MIN MAX AVG
Down Stream Line Rate 66.6 Mbps 71.1 Mbps 69.0 Mbps
Up Stream Line Rate 13.8 Mbps 14.8 Mbps 14.0 Mbps
Up Time 863.0 Sec 900.0 Sec 899.7 Sec
Retrains 0.0 1.0 0.0
Current and Last 15 Minute Bin Performance
Parameters Last Traffic Count(Upto 15 mins) Current Traffic Count(Upto 15 mins)
Start Time Stamp 2017-08-30T15:54:04Z 2017-08-30T16:09:04Z
Ingress Code Violation 0 0
Egress Code Violation 0 0
Errored Seconds 0 0
Severely Errored Seconds 0 0
Unavailable Seconds 0 0


Whilst your upstream is marginally below your estimates [by 0.1mbps] I doubt we'd be able to raise a fault based on that. There have been a few drops in your connection over recent days though.


Let us know how your internal checks go.



If this post resolved your issue please click the 'This fixed my problem' button
 Anoush Mortazavi
 Plusnet Help Team