So you add 3 to the attn. before you give it to the checker, knowing full well the usual effect of ADSL2+.

OK, well it wasnt my understanding of how to gauge the ADSL2+ speed. I thought you took your ADSLmax line attenuation, pump it in and it tells you what to expect from ADSL2+.

Still not to bad at the moment:- http://www.speedtest.net/result/1713459300.png

Looks like Interleaving is on, have to check what the telnet command is to find that out o nthe 7800N.

Edited by deleted (Tue 17-Jan-12 20:30:55)

Max is what the modem itself thinks is possible and something like DSL or target noise margins, interleaving are holding you back

The figures are so fuzzy, that either approach puts you in the ball park. Which you are

Yes, some of those checker sites imply that attenuation is invariant under ADSL Mode.

I prefer: http://www.kitz.co.uk/adsl/max_speed_calc.php

Thanks Andrew.....forgot about Interleaving and i think it is on currently but not sure how to check it other than telnet into my router.
Any ideas if the Interleaving depth is the "D" row i have highlighted below?
(note i've resynced after *ahem* replacing the cable between the RF3 filter and master socket as per my post the other week, existing one had split open in a couple of places after years of being stood on under the carpet).

> adsl info --stats
adsl: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 8000
Max: Upstream rate = 948 Kbps, Downstream rate = 11408 Kbps
Path: 0, Upstream rate = 945 Kbps, Downstream rate = 10000 Kbps

Link Power State: L0
Mode: ADSL2+
TPS-TC: ATM Mode
Trellis: U:ON /D:ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 5.5 12.4
Attn(dB): 37.0 20.2
Pwr(dBm): 0.0 13.0
ADSL2 framing
MSGc: 59 10
B: 61 21
M: 4 8
T: 5 6
R: 6 8
S: 0.7909 5.9116
L: 2569 249
D: 64 4
Counters
SF: 193525 175325
SFErr: 21 0
RS: 15723934 2101873
RSCorr: 2371 0
RSUnCorr: 431 0

HEC: 21 0
OCD: 0 0
LCD: 0 0
Total Cells: 73318727 6900793
Data Cells: 2008232 426540
Drop Cells: 0
Bit Errors: 0 0

ES: 125 7
SES: 69 0
UAS: 1421 1421
AS: 3108

INP: 0.59 0.51
PER: 16.06 17.73
delay: 12.65 5.91
OR: 32.36 7.21

Bitswap: 508 0

Deleted the rest but there were "FEC" counts so think this is "Forward Error Correction" and hence Interleaving is on?

With what NMs? All my quotes assume 6 dB in absence of any further info.

RF3 filter which is reducing noise may also have a small affect on the ADSL2+, or just indicate your line is never going to excel speed wise

Interlease depth of 64 makes sense

In reply to a post by MrSaffron:

RF3 filter which is reducing noise may also have a small affect on the ADSL2+, or just indicate your line is never going to excel speed wise

Interlease depth of 64 makes sense

OK well at some point i want to get BT to move the master socket from the middle of the hall and put it on the external wall which the drop wire comes to so might not bother with an RF3 and take it direct into the master socket.

Will get the wife to resync the router tomorrow during the day.

Thanks all.

In reply to a post by XRaySpeX:

With what NMs? All my quotes assume 6 dB in absence of any further info.

15Mb/s on 3db, 12.8 on 6db. The margin reported on my router is currently varying from nearly 9db mid morning to just over 6db in the evenings. I suppose that fits in with the fact that at the moment with a target of 3db it'll drop two or three times a day.