In reply to a post by dazzle39:

My line has recently been switched to 21CN equipment in my Market 1 exchange but I have yet to make make the jump to ADSL2+ and am wondering whether this would in fact be a good move ...

Any advice would be gratefully received.

It looks like you are on a great line - I would ask your ISP to move you to an ADSL2+ package ASAP

On my connection I was at 9dB originally, and on each re-sync it would jump to 12, 15, 18 and finally 21dB. Speed dropped to around 4 Meg. Mostly due to timing. I switched around the time of the Jubillee, and then there was the Euro 2012. Latency was pretty high in the evenings as a result.

Now on 3dB.

The OP should get close to full ADSL2+ speeds assuming all things go well.

Regrade order placed - should happen overnight.

I'll post some more line stats once the connection has settled down - should be interesting!

Thanks again for all the comments

Well, line now switched to ADSL2+ (which took longer than expected).

BUT I'm not convinced that everything is as it should be.

I know that I am only just into the so called 10 day 'training period' but ever since the connection was switched yesterday morning my router has not resynchronised once (apart from a H/W reset initiated by myself earlier today).

Connection speed has not risen above 3230kibs/s, NM is 31.5dB, the attenuation has actually dropped from ADSL to 21.5dB. Routerstats showing everything stable, no errors etc.

I would have thought that the line would have synced at a higher level, or at least DLM would have brought the NM down, forcing the connection to resync by now.

Am I being impatient, or is something wrong?

Router stats as follows (ST 546v6)

Modemstate : Up
xDSL Type : ADSL2+
xDSL Standard : ITU-T G.992.5
xDSL Annex : Annex A
Uptime (days hh:mm:ss) : 0 days, 1:11:19

Number of resets : 1

Total Available Bandwidth Cells/s kbit/s
Downstream : 7617 3230
Upstream : 1535 651

Intrinsic/Actual and Maximum Bandwidth % kbit/s
Downstream : 27 11856
Upstream : 100 648

Bearer Generic Info Downstream Upstream
INP (DMT) : 1.15 2.03
Delay (ms) : 7.52 7.95
R : 16 12
Margin (dB) : 31.5 10.5
Attenuation (dB) : 21.5 11.0
OutputPower (dBm) : 0.0 9.5

Vendor Chipset Local Remote
Country : B5 B5
Vendor : BDCM IFTN
VendorSpecific : 0000 BE71
StandardRevisionNr : 00 02
Vendor System
Country : 0F 00
Vendor : TMMB ----
VendorSpecific : 3C61 0000
StandardRevisionNr : 00 00


Transfer statistics
Errors
Received FEC : 0
Received CRC : 0
Received HEC : 0
Transmitted FEC : 0
Transmitted CRC : 0
Transmitted HEC : 0

Near end failures since reset
Loss of frame : 0 failures
Loss of signal : 0 failures
Loss of power : 0 failures
Errored seconds : 0 seconds

Near end failures last 15 minutes
Loss of frame : 0 seconds
Loss of signal : 0 seconds
Loss of power : 0 seconds
Errored seconds : 0 seconds

Near end failures current day
Errored seconds : 0 seconds

Near end failures previous day
Errored seconds : 0 seconds

The BT Wholesale 10 day training period DOES NOT FORCE RESYNCS.
Time for you to reboot it and see if the spare margin is converted into sync.

Changes in the TARGET noise margin (rather than the one displayed) only come into effect the next time the modem resyncs.

I have rebooted the modem as suggested.

Resync has resulted in the noise margin remaining the same but an even lower sync rate?!

Not sure what is going on here - is it an ISP issue (ENTA) or a line problem - which appears very stable and 'noise' free.

Confused!!

Current stats below

Modemstate : Up
xDSL Type : ADSL2+
xDSL Standard : ITU-T G.992.5
xDSL Annex : Annex A
Uptime (days hh:mm:ss) : 0 days, 0:02:35

Number of resets : 1

Total Available Bandwidth Cells/s kbit/s
Downstream : 5450 2311
Upstream : 978 415

Intrinsic/Actual and Maximum Bandwidth % kbit/s
Downstream : 22 10092
Upstream : 98 420

Bearer Generic Info Downstream Upstream
INP (DMT) : 0.00 0.00
Delay (ms) : 0.24 0.24
R : 0 0
Margin (dB) : 31.0 17.0
Attenuation (dB) : 21.5 11.0
OutputPower (dBm) : 0.0 9.5

Vendor Chipset Local Remote
Country : B5 B5
Vendor : BDCM IFTN
VendorSpecific : 0000 BE71
StandardRevisionNr : 00 02
Vendor System
Country : 0F 00
Vendor : TMMB ----
VendorSpecific : 3C61 0000
StandardRevisionNr : 00 00


Transfer statistics
Errors
Received FEC : 0
Received CRC : 0
Received HEC : 0
Transmitted FEC : 0
Transmitted CRC : 0
Transmitted HEC : 0

Near end failures since reset
Loss of frame : 0 failures
Loss of signal : 0 failures
Loss of power : 0 failures
Errored seconds : 0 seconds

Near end failures last 15 minutes
Loss of frame : 0 seconds
Loss of signal : 0 seconds
Loss of power : 0 seconds
Errored seconds : 0 seconds

Near end failures current day
Errored seconds : 0 seconds

Near end failures previous day
Errored seconds : 0 seconds

SNR Margins have not remained the same - are they being reported correctly as upstream and downstream margins? Sometimes certain routers will report them the wrong way round...

Downstream SNR Margin since change to ADSL2+ has been 31 or 31.5 (was 15 on ADSL after switch to 21CN MSAN)
Upstream SNR Margin has changed from 17 to 10.5 (was 11 on ADSL as above)

I see no reason to think that the router is reporting these the wrong way round. Is there a way to check?

Sorry must have misread your stats: looked like the reported adsl2+ upstream margin had changed from 10.5 to 17

Edit: please see Mr. S's reply to me which may have been intended for you

Edited by 4M2 (Wed 18-Jul-12 18:13:27)

Get ISP to request a reset of DLM or removal of the banding that may have been applied to the line.