topic Re: Stability Profile change in Full Fibre

Stability Profile change

steve88 — Sat, 27 Nov 2021 11:06:25 GMT

Is it possible to tell me what stability profile my line is currently set to as DLM doesn't seem to want to take off interleaving despite having low ES per day and no line drops. I think it might have been changed to STABLE as a first attempt when a reported a problem with line drops at the end of September. If it is can it be changed to STANDARD or even SPEED.

I am on a fibre FTTC connection about 950m from the cabinet. Starting at the end of September I had lots of problems with my connection dropping. It took a number of visits of a BT OR senior engineer who ultimately replaced about 300m of overhead line including the final dropwire. This new section of line has reduced downstream attenuation from 24.5db to 22.9db and there is a corresponding increase in speed 🙂

DL: 30.0M now 37.6M

UL: 4.76M now 4.93M

The line is has now been stable for a month with most resyncs either being DLM or me. All good apart from the interleaving, which I didn't have for many months before the line fault (and maybe the negligible increase in UL speed)

Stats:

Stats recorded 27 Nov 2021 10:54:36

DSLAM type / SW version:	IFTN:0xb206 (178.6) / v0xb206
Modem/router firmware:  	AnnexA version - A2pv6C038m.d24j
DSL mode:               	VDSL2 Profile 17a
Status:                 	Showtime
Uptime:                 	15 days 8 hours 24 min 31 sec
Resyncs:                	0 (since 12 Nov 2021 13:48:56)
			
				Downstream	Upstream
Line attenuation (dB):  	22.9		0.0
Signal attenuation (dB):	Not available on VDSL2		
Connection speed (kbps):	37615		4932
SNR margin (dB):        	6.6		6.6
Power (dBm):            	-0.2		-0.2
Interleave depth:       	737		1
INP:                    	3.00		0
G.INP:                  	Not enabled		Not enabled
Vectoring status:       	5 (VECT_UNCONFIGURED)

xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason:	6
Last initialization procedure status:	0
Max:	Upstream rate = 5504 Kbps, Downstream rate = 44100 Kbps
Bearer:	0, Upstream rate = 4932 Kbps, Downstream rate = 37615 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):	 6.6		 6.7
Attn(dB):	 22.9		 0.0
Pwr(dBm):	-0.2		-0.2

Re: Stability Profile change

Gandalf — Sun, 28 Nov 2021 10:48:41 GMT

Thanks for your post @steve88

I'm really sorry for the issues you've had with your connection and I'm glad to see an engineer's efforts got things sorted.

I've placed an order to change the stability profile from Stable to Standard, which is the lowest it goes. This should start to take effect from Tuesday next week, but may take 7 to 14 days for DLM to react to the changes.

The speed profile you're referring to is Openreach's terminology for this. Taken from the Kitz website Here:

Stability Level	WBC Profile (20/21CN)	NGA Profile (FTTC)	Description

1. Aggressive	Standard	Speed	Prioritise speed over stability for online gamers
2. Normal	Stable	Standard	Best overall balance between speed and stability
3. Stable	Super Stable	Stable	Prioritise stability over speed for IPTV

'WBC Profile' refers to BT Wholesale's terminology and 'NGA Profile' refers to Openreach's.

Let us know how it goes.

Re: Stability Profile change

steve88 — Sun, 28 Nov 2021 13:04:34 GMT

Many thanks @Gandalf

I will add an update once the DLM has settled down again in 10-14days

Re: Stability Profile change

Gandalf — Sun, 28 Nov 2021 15:37:06 GMT

No problem @steve88 sounds good

Re: Stability Profile change

steve88 — Thu, 16 Dec 2021 17:49:37 GMT

So here we are almost 3 weeks later and the profile change was successful.

Profile change occured early hours of 02 Dec 21.

DL speed went from 37.6M to 40M

UL speed went from 4.93M to 5.32M

Interleaving was removed so latency/delay dropped.

The line has been stable for the 2+ weeks since. Good result. Thanks @Gandalf

Stats recorded 16 Dec 2021 17:42:40

DSLAM type / SW version:	IFTN:0xb206 (178.6) / v0xb206
Modem/router firmware:  	AnnexA version - A2pv6C038m.d24j
DSL mode:               	VDSL2 Profile 17a
Status:                 	Showtime
Uptime:                 	14 days 15 hours 50 min 4 sec
Resyncs:                	0 (since 05 Dec 2021 08:21:51)
			
				Downstream	Upstream
Line attenuation (dB):  	22.6		0.0
Signal attenuation (dB):	Not available on VDSL2		
Connection speed (kbps):	39998		5322
SNR margin (dB):        	7.0		6.0
Power (dBm):            	2.3		2.3
Interleave depth:       	1		1
INP:                    	0		0
G.INP:                  	Not enabled		Not enabled
Vectoring status:       	5 (VECT_UNCONFIGURED)

xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason:	1
Last initialization procedure status:	0
Max:	Upstream rate = 5210 Kbps, Downstream rate = 42364 Kbps
Bearer:	0, Upstream rate = 5322 Kbps, Downstream rate = 39998 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):	 7.1		 6.0
Attn(dB):	 22.6		 0.0
Pwr(dBm):	 2.3		 2.3

Re: Stability Profile change

Gandalf — Fri, 17 Dec 2021 08:08:18 GMT

Thanks for the update @steve88

Excellent! That's really good to see.

Let us know if you have further issues or there's anything else you'd need help with.