Help of diagnosing my high error rates causing resyncs

[#1]

@scrookes?

[#2]

@Oldjim GEA test below for you.

Test Outcome	Pass
Test Outcome Code	GTC_FTTC_SERVICE_0000
Description	GEA service test completed and no fault found .
Main Fault Location	OK
Sync Status	In Sync
Downstream Speed	45.3 Mbps
Upstream Speed	8.5 Mbps
Appointment Required	N
Fault Report Advised	N
NTE Power Status	PowerOn
Voice Line Test Result	Pass
Bridge Tap	Not Detected
Repetitive Electrical Impulse Noise	Not Detected
Estimated Line Length In Metres	711.6
Upstream Rate Assessment	Reasonable
Downstream Rate Assessment	Good
Interference Pattern	Regular Interference Observed Daily
Service Impact	No Impact Observed
Interference Duration Longest Occurrence	; 00:00 to 23:45
Interference Location	Customer Premise
Interference Observed In Days	14
Home Wiring Problem	Not Detected
Downstream Policing Discard Rate	0.0
Customer Traffic Level	Upstream and Downstream Traffic Detected
Technology	VDSL
Profile Name	0.128M-80M Downstream 3dB, Retransmission High - 0.128M-20M Upstream, Error Protection Off
Time Stamp	2018-02-03T12:15:00

Parameters	MIN	MAX	AVG
Down Stream Line Rate	41.9 Mbps	49.8 Mbps	48.2 Mbps
Up Stream Line Rate	7.8 Mbps	8.4 Mbps	8.2 Mbps
Up Time	789.0 Sec	900.0 Sec	899.6 Sec
Retrains	0.0	2.0	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	2018-02-16T11:50:33Z	2018-02-16T12:05:33Z
Ingress Code Violation	14	1
Egress Code Violation	0	0
Errored Seconds	0	0
Severely Errored Seconds	0	0
Unavailable Seconds	0	0

[#3]

Actual line speed 47,406 which is significantly higher than reported by the GEA Test and is a result of Retransmission High

How is the interference customer premises determined as opposed to just outside it which is the only overhead wire across the road from the pole and given that numerous checks have failed to identify any internal source on interference

Note that the actual line length is 800 metres

[#4]

I don't know what has happened but with no changes I am aware of I am now on over 9 days with no drop in sync

[#5]

@Oldjim

What are the line stats looking like now that it seems stable?

[#6]

DSLAM/MSAN type:        	BDCM:0xa48c / v0xa48c
Modem/router firmware:  	AnnexA version - A2pv6F039g1.d24m
DSL mode:               	VDSL2 Profile 17a
Status:                 	Showtime
Uptime:                 	9 days 16 hours 33 min 31 sec
Resyncs:                	0 (since 19 Feb 2018 10:12:28)
			
				Downstream	Upstream
Line attenuation (dB):  	21.1		0.0
Signal attenuation (dB):	Not monitored		
Connection speed (kbps):	47406		8471
SNR margin (dB):        	3.8		4.7
Power (dBm):            	12.8		5.0
Interleave depth:       	4		1
INP:                    	52.00		0
G.INP:                  	Enabled		Not enabled
Vectoring status:       	5 (VECT_UNCONFIGURED)		

RSCorr/RS (%):          	48.0160		0.5899
RSUnCorr/RS (%):        	0.0000		0.0000
ES/hour:                	0.23		1.36

[#7]

The ES rate is almost zero now! Has someone quietly replaced the cable to the exchange?   Looks just like you are on a brand new line.

Otherwise it's a mystery. 

[#8]

Just had a power cut and as usual my router restarted quicker than everyone else - this won't hold

Stats recorded 19 Feb 2018 17:08:32

DSLAM/MSAN type:        	BDCM:0xa48c / v0xa48c
Modem/router firmware:  	AnnexA version - A2pv6F039g1.d24m
DSL mode:               	VDSL2 Profile 17a
Status:                 	Showtime
Uptime:                 	 0 hour 1 min 13 sec
Resyncs:                	0 (since 19 Feb 2018 10:12:28)
			
				Downstream	Upstream
Line attenuation (dB):  	21.1		0.0
Signal attenuation (dB):	Not monitored		
Connection speed (kbps):	51817		10984
SNR margin (dB):        	1.8		3.1
Power (dBm):            	12.9		7.1
Interleave depth:       	4		1
INP:                    	51.00		0
G.INP:                  	Enabled		Not enabled
Vectoring status:       	5 (VECT_UNCONFIGURED)		

RSCorr/RS (%):          	1.5422		0.0068
RSUnCorr/RS (%):        	0.0000		0.0000
ES/hour:                	0.15		1.92

[#9]

The downstream SNRM is well below the minimum specified. BT have only recently reduced SNRM from 6db to 3db as a theoretical minimum but yours is in the realms of instability (as you well know). To me this indicates a DLM fault of some sort, especially if it doesn't even try to regain at least 3db. There must be a way to get a DLM reset done surely? Even if it means getting a BT technician to visit. You have enough evidence to show that the line is unstable because of the DLMs failure to control at correct settings.

[#10]

It's not a DLM fault, Oldjim's routed resynced quickly at the normal 6dB SNRM then other lines came back up creating noise and crosstalk resulting in a reduction in SNRM to a rather low level which will soon cause a resync.

[#11]

According to the last GEA test, it's on a 3 dB target SNRM setting.

[#12]

It is on 3dB default it is just that it resynched before the crosstalk from other users came in