Interesting Statistics for one wire (fault) FTTC

So, it seems I have a line fault (no dial tone) - the diagnostics indicate that there is a line fault one leg disconnected.

Anyway, that is being fixed but in the mean time the FTTC connection is still working (much slower).

Here are the stats for interest.

### Current Situation - FTTC over one wire - ####

# xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 2
Last initialization procedure status: 0
Max: Upstream rate = 3026 Kbps, Downstream rate = 32204 Kbps
Bearer: 0, Upstream rate = 3026 Kbps, Downstream rate = 34376 Kbps
Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 Kbps
Link Power State: L0
Mode: VDSL2 Annex B
VDSL2 Profile: Profile 17a
TPS-TC: PTM Mode(0x0)
Trellis: U:ON /D:ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 5.9 5.7
Attn(dB): 29.6 0.0
Pwr(dBm): 13.0 -1.8

-----------------------------------------
### Normal Conditions #####

# xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Last initialization procedure status: 0
Max: Upstream rate = 17778 Kbps, Downstream rate = 66112 Kbps
Bearer: 0, Upstream rate = 17830 Kbps, Downstream rate = 66459 Kbps
Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 Kbps
Link Power State: L0
Mode: VDSL2 Annex B
VDSL2 Profile: Profile 17a
TPS-TC: PTM Mode(0x0)
Trellis: U:ON /D:ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 6.3 5.8
Attn(dB): 21.3 0.0
Pwr(dBm): 13.0 7.5

============================

Hopefully the line will be fixed soon, but interesting to see how FTTC works during a fault condition resulting in only one wire. 32 mbps isn't too bad!

Edited by marcusjclifford (Mon 05-Oct-15 15:00:36)

I think broadband might only requires one wire due to its basically RF, also RF can jump over breaks but with an attenuation in the signal, so you may loose some speed.

We hade the same issue on our ADSL2+ several months back where our line went dead with no DC power on the line, however our broadband worked fine.

Took a couple of days for an engineer to arrive and fix the issue and BT redirected all our calls to one of our mobiles.

Paul

Yup, I've had similar on ADSL before.

For this FTTC issue I was able to trace my line back as far as I have access to and I think the issue is in the actual cabinet. I am in a modern block of flats and can see the DP in the basement so was able to trace my line back to that and ensure from my master test socket in the flat it was all connected up to that point so the issue is between there and the cab, or more likely in the cab.

Well it wouldn't be between your cabinet to the exchange due to you "shouldn't" be loosing speed, unless its a short on your copper line, so it could be between your property and the cabinet, so the break could be in the cabinet or the chamber.

Either way it needs to be reported to your phone provider.

Have you tried to phone your land line via a mobile?, I bet you just hear it ring on your mobile.

Paul

I have had a similar experience with ADSL. The BT repair man said the situation was not uncommon.

In reply to a post by Michael_Chare:

I have had a similar experience with ADSL. The BT repair man said the situation was not uncommon.

Yeah, I was told the same.

Paul

The few times I've had this happen on other lines it's always been a case of it being that a previous engineer had "knocked" or pulled out the wire accidently.

It's little surprise when you see the state of the inside of some cabinets that this happens, still hopefully a 2 minute job with a punch down tool will see it fixed.

PlusNet tester at least identified the fault "correctly" as being a:

Description: FAULT - Dis One Leg In Network. The fault is external to your premises and we shouldn't need access to your property.