Kitz Forum
Broadband Related => Broadband Technology => Topic started by: GigabitEthernet on August 02, 2012, 03:39:14 PM
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My exchange is finally being upgraded to 21CN. Despite what SamKnows says, the exchange seems to be ready and Zen (my ISP) have ordered the migration to 21CN. Once that happens (they estimate 5-6 days for this) I can upgrade to ADSL2+.
Some background: I am estimated 4Mb, but I get 5-6Mb now so I am hoping I will get 7-8Mb. My attenuation is currently 40dB.
I'll keep the thread updated with the progress.
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You'll deffo get more than 4 Meg !!! Hope it goes over smoothly for you !! :)
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You'll deffo get more than 4 Meg !!! Hope it goes over smoothly for you !! :)
Black Sheep, would you mind checking my exchange just to make sure? It is THBT.
Thank you.
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I'm afraid I wouldn't know how to even go about attempting that ?? I'm sure B*Cat and Walter have some magical site they visit, to check out these things ??
I would help if I could. :)
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:hmm: Hmm . . . THBT, that is not too far west from Walter's normal haunts and being only just over the Surrey / Hampshire border, I suspect that Walter may be able to glean some information on the exchange status.
At a guess, if all goes well, I would expect you to achieve 9500 kbps DS (i.e. ~ 9.5 Mbs). :)
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Good luck AR :)
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Have you turned into a pirate, kitz ?? ;D
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At a guess, if all goes well, I would expect you to achieve 9500 kbps DS (i.e. ~ 9.5 Mbs). :)
Is that at 6dB or 3dB out of curiosity?
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I'm basing that guesstimate on a 6 dB target SNRM. :)
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Have you turned into a pirate, kitz ?? ;D
Aye, I mean yes. Kitz, have you drunken something you shouldn't :).
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Zen have informed me that the migration is set for the 9th August. The move to "up to 20Mb" then should take a couple of days, or so I am told.
Hopefully all goes well :) .
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Zen have informed me that the migration is set for the 9th August. The move to "up to 20Mb" then should take a couple of days, or so I am told.
Hopefully all goes well :) .
:fingers:
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I woke up this morning to find this under my Zen account, under the tracking page for the order:
Re-setup account on RADIUS servers for linked order item(s) - FAILED 09/08/2012 01:45
Is this bad? I have a feeling...
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Migrated to 21CN now, still on ADSL Max but I am now syncing at 8000Kbps!!!!
Stats attached.
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Looks like the engineer is still doing tests at the exchange as the line (including the phone) went dead a few minutes ago. The line was erroring quite a bit.
The line has now synced back up at 32Kbps slower, and the SNRM margin seems to have decreased despite the lower sync speed (does anybody know why?).
Stats attached.
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I see that you have a modem/router with a Broadcom chipset and you are now connected to a MSAN with an Infineon chipset. :)
Things are looking good for you but it's still early days and you should let it "settle down".
The only advice I'll give at this moment is to disconnect the modem/router from the xDSL and, thus, allow the MSAN to have some "quiet quality time" on its own. (Perhaps an hour.) Whilst the modem/router is disconnected, take that time to go through and check all of its settings. For example, does it have an xDSL mode setting? Perhaps G.Dmt, ADSL2, ADSL2+ and Auto could be the options available. You might like to try either forcing ADSL2+ or Auto, depending upon how it is currently configured.
Once you have reconnected the modem/router to the xDSL, resist the urge to "fiddle". ;)
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The connection hasn't been switched to ADSL2+ yet, I can request that when I please :).
I'll turn off the router for an hour and give it some "quality time" :).
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Left the connection for an hour (turned off) and it is looking good.
Thanks for the advice burakkucat :).
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I have now been moved over to ADSL2+. Unfortunately due to some instability the target SNRM has increased to 12dB, but hopefully this will reduce over time.
/usr/sbin/adslctl: ADSL driver and PHY status
Status: ShowtimeRetrain Reason: 8000
Channel: FAST, Upstream rate = 888 Kbps, Downstream rate = 6016 Kbps
Link Power State: L0
Mode: ADSL2+
Channel: Fast
Trellis: U:ON /D:ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 12.3 8.2
Attn(dB): 43.5 23.3
Pwr(dBm): 0.0 12.9
Max(Kbps): 7220 888
Rate (Kbps): 6016 888
G.dmt framing
K: 189(0) 14
R: 14 16
S: 1 8
D: 32 8
ADSL2 framing
MSGc: 59 10
B: 188 13
M: 1 8
T: 1 9
R: 14 16
S: 1.0000 4.0000
L: 1624 256
D: 32 8
Counters
SF: 289357 261170
SFErr(CRCErr): 1 0
RS: 18808220 406102
RSCorr: 1213 0
RSUnCorr: 2 0
HEC: 1 0
OCD: 0 0
LCD: 0 0
Total Cells: 66715430 232726
Data Cells: 9171979 6924
Drop Cells: 0
Bit Errors: 0 0
ES: 1 0
SES: 0 0
UAS: 324 0
AS(Uptime): 4702
INP: 1.10 2.00
PER: 16.25 18.00
delay: 8.00 8.00
OR: 32.00 7.11
Bitswap: 377 0
Total uptime: 4702
Total time = 1 hours 29 min 28 sec
SF = 289357
CRC = 1
LOS = 0
LOF = 0
ES = 1
Latest 1 day time = 1 hours 29 min 28 sec
SF = 289357
CRC = 1
LOS = 0
LOF = 0
ES = 1
Latest 15 minutes time = 14 min 28 sec
SF = 53452
CRC = 0
LOS = 0
LOF = 0
ES = 0
Previous 15 minutes time = 15 min 0 sec
SF = 55366
CRC = 1
LOS = 0
LOF = 0
ES = 1
Previous 1 day time = 0 sec
SF = 0
CRC = 0
LOS = 0
LOF = 0
ES = 0
15 minutes interval [-30 min to -15 min] time = 15 min 0 sec
SF = 55366
CRC = 0
LOS = 0
LOF = 0
ES = 0
15 minutes interval [-45 min to -30 min] time = 15 min 0 sec
SF = 55365
CRC = 0
LOS = 0
LOF = 0
ES = 0
15 minutes interval [-60 min to -45 min] time = 15 min 0 sec
SF = 55366
CRC = 0
LOS = 0
LOF = 0
ES = 0
Showtime Drop Reason: 8000
Last Retrain Reason: 8000
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Channel: FAST, Upstream rate = 888 Kbps, Downstream rate = 6016 Kbps
. . .
Mode: ADSL2+
Looking at the above two lines, if the first is truly representative of what your line can achieve, then I would suggest that you configure the modem to operate in ADSL2, rather than ADSL2+ mode.
But, as you say, early days. So give it some time to settle and no fiddling! ::)
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Thank you, burakkucat. Any ideas on how to present the stats without all of the text getting misaligned?
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You're welcome.
As for your subsequent query, have you tried beginning & ending the information to be displayed with either "code" or "quote" tags?
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You're welcome.
As for your subsequent query, have you tried beginning & ending the information to be displayed with either "code" or "quote" tags?
Fixed. Thank you :).
For anybody else, I used the "code" tags.
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Errors seem to be nice and low too. But then again, the SNRM is quite high.
Hopefully it stays that way!
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>> I have now been moved over to ADSL2+. Unfortunately due to some instability the target SNRM has increased to 12dB,
Do you know what sort of instability? Was there any particular reason ?
That seems to be rather a rapid move up to 12dB :/
What was your SNRM when on maxdsl?
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Come to think about it surely interleaving would have first been turned on, before the target SNRM was increased? :-\
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OP is probably one of those customers who insist on interleaving being off no matter what.
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My experience with ADSL2+ on 21CN/WBC is that DLM is extremely eager to switch off interleaving. As I've reported elsewhere, I've twice asked my ISP to get my connection switched to interleaved, twice they've done it, and twice DLM has promptly switched it back to fastpath. This is despite the fact that my error rate is very high. (I gather from BS that there is a solution, but I haven't pursued it yet).
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As far as I can tell, fast path was turned on as soon as I switched to ADSL2+.
OP is probably one of those customers who insist on interleaving being off no matter what.
And no, I don't.
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>> I have now been moved over to ADSL2+. Unfortunately due to some instability the target SNRM has increased to 12dB,
Do you know what sort of instability? Was there any particular reason ?
That seems to be rather a rapid move up to 12dB :/
According to Zen, the line was very unstable when I moved to ADSL2+, but I can't confirm this as I was asleep and not doing any monitoring.
However, I am starting to believe that the target SNRM wasn't reset on migration to 21CN.This is because the target SNRM was 12dB on ADSL Max due to an unstable router which has now been removed and replaced with a (currently) much more stable NETGEAR DG834GT.
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The connection remained connected last night with very few issues, see these stats:
/usr/sbin/adslctl: ADSL driver and PHY status
Status: ShowtimeRetrain Reason: 8000
Channel: FAST, Upstream rate = 888 Kbps, Downstream rate = 6016 Kbps
Link Power State: L0
Mode: ADSL2+
Channel: Fast
Trellis: U:ON /D:ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 11.1 7.5
Attn(dB): 43.5 23.3
Pwr(dBm): 0.0 12.9
Max(Kbps): 6580 888
Rate (Kbps): 6016 888
G.dmt framing
K: 189(0) 14
R: 14 16
S: 1 8
D: 32 8
ADSL2 framing
MSGc: 59 10
B: 188 13
M: 1 8
T: 1 9
R: 14 16
S: 1.0000 4.0000
L: 1624 256
D: 32 8
Counters
SF: 3542718 3198279
SFErr(CRCErr): 16 0
RS: 230276728 1734450
RSCorr: 9365 250
RSUnCorr: 170 0
HEC: 15 0
OCD: 0 0
LCD: 0 0
Total Cells: 816836047 1630396
Data Cells: 58332229 38969
Drop Cells: 0
Bit Errors: 0 0
ES: 12 0
SES: 0 8
UAS: 324 0
AS(Uptime): 57570
INP: 1.10 2.00
PER: 16.25 18.00
delay: 8.00 8.00
OR: 32.00 7.11
Bitswap: 9575 0
Total uptime: 57570
Total time = 16 hours 10 min 36 sec
SF = 3542718
CRC = 16
LOS = 0
LOF = 0
ES = 12
Latest 1 day time = 16 hours 10 min 36 sec
SF = 3542718
CRC = 16
LOS = 0
LOF = 0
ES = 12
Latest 15 minutes time = 10 min 36 sec
SF = 39132
CRC = 0
LOS = 0
LOF = 0
ES = 0
Previous 15 minutes time = 15 min 0 sec
SF = 55366
CRC = 0
LOS = 0
LOF = 0
ES = 0
Previous 1 day time = 0 sec
SF = 0
CRC = 0
LOS = 0
LOF = 0
ES = 0
15 minutes interval [-30 min to -15 min] time = 15 min 0 sec
SF = 55365
CRC = 0
LOS = 0
LOF = 0
ES = 0
15 minutes interval [-45 min to -30 min] time = 15 min 0 sec
SF = 55428
CRC = 0
LOS = 0
LOF = 0
ES = 0
15 minutes interval [-60 min to -45 min] time = 15 min 0 sec
SF = 55365
CRC = 0
LOS = 0
LOF = 0
ES = 0
Showtime Drop Reason: 8000
Last Retrain Reason: 8000
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According to Zen, the line was very unstable when I moved to ADSL2+, but I can't confirm this as I was asleep and not doing any monitoring.
However, I am starting to believe that the target SNRM wasn't reset on migration to 21CN.This is because the target SNRM was 12dB on ADSL Max due to an unstable router which has now been removed and replaced with a (currently) much more stable NETGEAR DG834GT.
Now you are back on the DG834GT, perhaps you could recommence the 24/7 monitoting scripts that may give some insight into what is going on while you are asleep, levels of stability etc.
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Now you are back on the DG834GT, perhaps you could recommence the 24/7 monitoting scripts that may give some insight into what is going on while you are asleep, levels of stability etc.
Good idea BE.
Rather than waiting a very long time (potentially) for the SNRM to come down on its own, how long should I wait before requesting Zen to lower it? Is that a good idea?
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The connection remained connected last night with very few issues, see these stats:
Channel: FAST, Upstream rate = 888 Kbps, Downstream rate = 6016 Kbps
G.dmt framing
K: 189(0) 14
R: 14 16
S: 1 8
D: 32 8
ADSL2 framing
MSGc: 59 10
B: 188 13
M: 1 8
T: 1 9
R: 14 16
S: 1.0000 4.0000
L: 1624 256
D: 32 8
That does state Channel as "Fast", but it also reports values for Interleaving (D:)
I believe that D: values of 1 mean Interleaving is OFF, any other value meaning it is on (at whatever depth is reported).
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[quote author=Bald_Eagle1 link=topic=11501.msg222119#msg222119 date=1345106308]
Channel: FAST, Upstream rate = 888 Kbps, Downstream rate = 6016 Kbps
G.dmt framing
K: 189(0) 14
R: 14 16
S: 1 8
D: 32 8
ADSL2 framing
MSGc: 59 10
B: 188 13
M: 1 8
T: 1 9
R: 14 16
S: 1.0000 4.0000
L: 1624 256
D: 32 8
That does state Channel as "Fast", but it also reports values for Interleaving (D:)
I believe that D: values of 1 mean Interleaving is OFF, any other value meaning it is on (at whatever depth is reported).
I did wonder about that. Why does the router report it as fast path then? It is not only this router either.
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I did wonder about that. Why does the router report it as fast path then? It is not only this router either.
I don't know the answer to that one, but Impulse Noise Protection & delay are also ON at various levels.
I believe these go hand-in-hand with Interleaving being switched ON.
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However, I am starting to believe that the target SNRM wasn't reset on migration to 21CN.This is because the target SNRM was 12dB on ADSL Max due to an unstable router which has now been removed and replaced with a (currently) much more stable NETGEAR DG834GT.
I was in a similar position when I migrated, but it didn't take DLM long to drop my target SNR margin right down to 3 dB. You may well find that the same happens to you. The good thing about 21CN/WBC is that there's no waiting for the IP profile to rise when the connection speed rises - it happens almost immediately.
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However, I am starting to believe that the target SNRM wasn't reset on migration to 21CN.This is because the target SNRM was 12dB on ADSL Max due to an unstable router which has now been removed and replaced with a (currently) much more stable NETGEAR DG834GT.
I was in a similar position when I migrated, but it didn't take DLM long to drop my target SNR margin right down to 3 dB. You may well find that the same happens to you. The good thing about 21CN/WBC is that there's no waiting for the IP profile to rise when the connection speed rises - it happens almost immediately.
What sort of timeframe was that?
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As far as I recall, about three days.
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Up to 15dB now! I didn't even do anything! Apart from Zen restarting the connection about 4 hours ago when they ran a diagnostic.
GRRRR!!!!
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:'(
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Tweaked down to 9dB and its rediculously stable with only 30 ES in 15 hours.
The line still appears to be underperforming on ADSL2+ (and ADSL2) with no speed increase at all.
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Up to 15dB now! I didn't even do anything! Apart from Zen restarting the connection about 4 hours ago when they ran a diagnostic.
GRRRR!!!!
Don't suppose you had the 24/7 script or roseway's program running that MIGHT have captured whatever may have immediately preceded the jump? (Unless it was indeed DLM seeing Zen's restarting of the connection as an indication of instability)
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I had roseway's script running and there was nothing except Zen's restart. The connect ion had been stable for at least 15 hours.
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Stats:
/usr/sbin/adslctl: ADSL driver and PHY status
Status: ShowtimeRetrain Reason: 8000
Channel: FAST, Upstream rate = 888 Kbps, Downstream rate = 6983 Kbps
Link Power State: L0
Mode: ADSL2+
Channel: Fast
Trellis: U:ON /D:ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 8.0 5.4
Attn(dB): 43.5 23.3
Pwr(dBm): 0.0 9.4
Max(Kbps): 7724 888
Rate (Kbps): 6983 888
G.dmt framing
K: 219(0) 14
R: 16 16
S: 1 8
D: 32 8
ADSL2 framing
MSGc: 59 10
B: 218 13
M: 1 8
T: 1 9
R: 16 16
S: 0.9989 4.0000
L: 1882 256
D: 32 8
Counters
SF: 3514728 3169655
SFErr(CRCErr): 33 10
RS: 228457342 1219230
RSCorr: 24974 52
RSUnCorr: 436 0
HEC: 32 30
OCD: 0 0
LCD: 0 0
Total Cells: 939689592 1634465
Data Cells: 50334598 40813
Drop Cells: 0
Bit Errors: 0 4223
ES: 26 0
SES: 0 5
UAS: 82 0
AS(Uptime): 57053
INP: 1.08 2.00
PER: 16.23 18.00
delay: 7.99 8.00
OR: 32.03 7.11
Bitswap: 9120 0
Total uptime: 57732
Total time = 16 hours 4 min 23 sec
SF = 3551737
CRC = 33
LOS = 0
LOF = 0
ES = 26
Latest 1 day time = 16 hours 4 min 23 sec
SF = 3551737
CRC = 33
LOS = 0
LOF = 0
ES = 26
Latest 15 minutes time = 4 min 23 sec
SF = 16251
CRC = 0
LOS = 0
LOF = 0
ES = 0
Previous 15 minutes time = 15 min 0 sec
SF = 55486
CRC = 0
LOS = 0
LOF = 0
ES = 0
Previous 1 day time = 0 sec
SF = 0
CRC = 0
LOS = 0
LOF = 0
ES = 0
15 minutes interval [-30 min to -15 min] time = 15 min 0 sec
SF = 55424
CRC = 0
LOS = 0
LOF = 0
ES = 0
15 minutes interval [-45 min to -30 min] time = 15 min 0 sec
SF = 55425
CRC = 0
LOS = 0
LOF = 0
ES = 0
15 minutes interval [-60 min to -45 min] time = 15 min 0 sec
SF = 55424
CRC = 0
LOS = 0
LOF = 0
ES = 0
Showtime Drop Reason: 8000
Last Retrain Reason: 8000
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A graphical representation of your connection over a period of time would give perhaps an easier to interpret indication of things.
I only had 178 minutes of data from you, but your connection looked pretty "unstable" back in May when it was still a G.DMT connection.
Unless those issues have now been fixed, I would imagine the higher frequencies available via ADSL2+ could make your connection even more sensitive to noise, RFI etc.
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The connection dropped again today and now I am back to 7dB. Neither Zen nor I have done anything. Strange!
Stats:
/usr/sbin/adslctl: ADSL driver and PHY status
Status: ShowtimeRetrain Reason: 8000
Channel: FAST, Upstream rate = 888 Kbps, Downstream rate = 6650 Kbps
Link Power State: L0
Mode: ADSL2+
Channel: Fast
Trellis: U:ON /D:ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 7.1 9.1
Attn(dB): 43.5 23.3
Pwr(dBm): 0.0 13.0
Max(Kbps): 9408 888
Rate (Kbps): 6650 888
G.dmt framing
K: 19(0) 14
R: 4 16
S: 1 8
D: 96 8
ADSL2 framing
MSGc: 95 10
B: 18 13
M: 1 8
T: 7 9
R: 4 16
S: 0.0907 4.0000
L: 2028 256
D: 352 8
Counters
SF: 8005 7075
SFErr(CRCErr): 1 32
RS: 5659694 127355
RSCorr: 936 290
RSUnCorr: 1 0
HEC: 1 11
OCD: 0 0
LCD: 0 0
Total Cells: 2012876 1013126
Data Cells: 14228 36155
Drop Cells: 0
Bit Errors: 0 431
ES: 43 138
SES: 1 13
UAS: 169 2
AS(Uptime): 129
INP: 2.77 2.00
PER: 16.03 18.00
delay: 7.98 8.00
OR: 50.38 7.11
Bitswap: 5 0
Total uptime: 80844
Total time = 22 hours 31 min 46 sec
SF = 4975445
CRC = 508
LOS = 1
LOF = 9
ES = 43
Latest 1 day time = 22 hours 31 min 46 sec
SF = 4975445
CRC = 508
LOS = 1
LOF = 9
ES = 43
Latest 15 minutes time = 1 min 46 sec
SF = 6630
CRC = 1
LOS = 0
LOF = 0
ES = 1
Previous 15 minutes time = 15 min 0 sec
SF = 47222
CRC = 450
LOS = 1
LOF = 9
ES = 1
Previous 1 day time = 0 sec
SF = 0
CRC = 0
LOS = 0
LOF = 0
ES = 0
15 minutes interval [-30 min to -15 min] time = 15 min 0 sec
SF = 55486
CRC = 0
LOS = 0
LOF = 0
ES = 0
15 minutes interval [-45 min to -30 min] time = 15 min 0 sec
SF = 55425
CRC = 0
LOS = 0
LOF = 0
ES = 0
15 minutes interval [-60 min to -45 min] time = 15 min 0 sec
SF = 55424
CRC = 1
LOS = 0
LOF = 0
ES = 1
Showtime Drop Reason: 8000
Last Retrain Reason: 8000
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There's something strange going on here.
ADSL1: 6656Kbps sync at 10.3dB
ADSL2: Haven't tested yet
ADSL2+: 6650Kbps sync at 7dB
Doesn't that look odd?
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There's something strange going on here.
ADSL1: 6656Kbps sync at 10.3dB
ADSL2: 6656Kbps sync at 6.3dB
ADSL2+: 6656Kbps sync at 7dB
Doesn't that look odd?
Where has 6656Kbps come from?
I have looked back through this thread & can't see that speed anywhere.
If you are constantly resyncing/rebooting the router, using the 3 different ADSL modes, I wonder if DLM has "capped" your sync speed, regardless of connection mode?
For curiosity, what are the attainable rates for each of the connections you mention above & are you setting SNR via DGTeam firmware or something else?
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Where has 6656Kbps come from?
If you are constantly resyncing/rebooting the router, using the 3 different ADSL modes, I wonder if DLM has "capped" your sync speed, regardless of connection mode?
For curiosity, what are the attainable rates for each of the connections you mention above & are you setting SNR via DGTeam firmware or something else?
Sorry, post changed to match the speeds.
Currently on ADSL1 and the max attainable rate is 8064Kbps (with a sync of 6656Kbps).
I am not tweaking any more.
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Max rate on ADSL2+ is 8944Kbps (with a sync of 6653Kbps).
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Yep, the line is banded at 6656Kbps. Damn.
Shown in this DLM diagram:
(https://forum.kitz.co.uk/proxy.php?request=http%3A%2F%2Fcommunity.plus.net%2Flibrary%2Fwp-content%2Fuploads%2F2009%2F09%2Fbanded1.jpg&hash=5c95f21bf751653e32f1e5c7283abb631b1db084)
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I'm still confused. Why is the margin on ADSL2 and 2+ so much lower than ADSL1 at the same speed. With a margin of 6dB on ADSL2+, my max speed is currently 6656Kbps which is much lower than before. I didn't expect the connection to get slower!
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There are without doubt some lines that perform better on adsl1 than adsl2+ - usually the longer ones.
adsl2+ opens up another 256 sub-channels (http://www.kitz.co.uk/adsl/adsl_technology.htm#dmt) available for use (why your atten will often increase), but these additional channels could be subject to noise interference, and if your line is too long to make real use of the sufficient bits loaded in the additional tones, then in a few cases the line is worse off.
adsl2+ does have some benefits though in that 1 bit per sub-channel can be loaded compared to a minimum of 2 on adsl1 - hence why a min 3dB SNRM rather than 6dB of adsl1.
adsl2+ also uses better RS algorithms - which in turn means less overhead and more useful data can be carried.
Generally speaking (very generally and not to be taken as true in all cases), but lines that sync at less than 6Mb may not always fair better on adsl2+. Anything 6-8Mb is suck it and see, but usually will see a bit of improvement.
ADSL2 though could be beneficial, as adsl2 has the better algorithm and RScode words, but still uses the same amount of sub-channels as ADSL1. If your line cant sync at more than 10Mb then adsl2 could give you the best of both worlds in that its not opening up the additional channels.
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ADSL2 has the same problem of syncing at 6656Kbps (max speed due to the line being banded) at a margin of 6dB or maybe 7dB.
From what I have seen, the banding on a 21CN line is usually removed after about 2-3 days of solid connection. I am currently at 1 day and 4 hours so not too long to wait now.
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Last 15 hours of graphs attached.
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Current stats data attached.
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It looks like you had another disconnection that will have no doubt messed up your waiting time for DLM to reinstate the speeds etc.
I'm not sure what to make of the graphs other than a little SNRM strangeness between 08:00 & 08:30 this morning & a few gaps in the snapshot bit-loading & SNR graphs & quite a spike in RSCorr errors at around 03:45 this morning.
It may be worth monitoring 24/7 for a few days to see if any patterns of errors/unusual SNR(M) changes etc. are developing.
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Zen are now going to reset the line to defaults with the router connected to the test socket and only a cordless phone connected. Unbeknownst to me, we actually own a dect phone which can cause problems, so that is now turned off completely and unplugged.
Zen tell me this should take a couple of hours so I will update this thread later on.
Thanks to everybody for your help so far, you know who you are :).
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I'm still getting somewhat less than 9.5Mb DS. Is there anything I can do?
Stats attached.
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If Zen are able to disable the operation of the DLM for your line, assuming your target SNRM is set to 6 dB and that the SNRM does not swing wildly between the hours of daylight & darkness, then you could tweak the target SNRM downwards by ~2 dB.
An approximate 2 dB reduction in target SNRM should give you about another 1000 kbps in DS sync speed.
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Zen have got BT to permanently set the SNRM at 6dB, thus basically disabling DLM. Now I can tweak to my heart's content! WOOO!!!
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Now I can tweak to my heart's content!
Magic. So enjoy. ;D