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Author Topic: A dodgy ADSL connection - an update  (Read 5360 times)

boost

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A dodgy ADSL connection - an update
« on: August 21, 2014, 11:16:19 AM »

Howdy

Some of you may remember my goal of getting a 4Mb TalkTalk ADSL1 connection from being interleaved to the hilt, over to fastpath.

TT supplied a DSL-3680 for this connection. I'm not sure what chipset is in this but something tells me it IDs itself as IFTN but I can't seem to verify this. Browsing through the ADSL commands now, I am none the wiser. What I can tell you, is the syntax matches the TI stuff I've seen in the ZyXELs, so maybe it's one of them? The DSLAM reports IFTN 0X71C6 which appears to be standard for TT LLU. Perhaps someone can advise if they know different?

Some output with the DSL-3680 acting as just a wireless access point if it helps anyone:

Code: [Select]
D-Link> wan adsl fwv
DMT FwVer: 3.20.19.0_TC3087 HwVer: T14F7_11.2

D-Link> wan adsl vendor
near-end vendorid: bb0c
far-end vendorid: 8043

D-Link> wan adsl nearituid
near end itu identification: 26 0 54 43 54 4e 0 0

So, rewind a few months.

1. The connection used to drop daily
2. Massive errors were always visible on downstream and upstream

I bought an HG612 and threw it on the line to try my luck. I observed the following almost instantly:

1. The synch speed was considerably lower at 6dB (HG: 4000~ vs DL: 4500~)
2. The reported downstream attenuation was quite a bit higher (HG: 57dB vs DL: 53dB)
3. The ping was 2-3ms higher with the HG attached (quite annoying at the time, native ping to bbc.co.uk was 40ms)
4. The upstream errors vanished with the HG (PhyR magic? Or is the DLink bollocksed in some way?)

Here's an example of the connection stats a few weeks ago. I think it was a fresh resynch but still heavily interleaved:

Code: [Select]
# xdslcmd info --show
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 8000
Max:    Upstream rate = 772 Kbps, Downstream rate = 4832 Kbps
Channel:        Interleaved, Upstream rate = 608 Kbps, Downstream rate = 4160 Kbps

Link Power State:       L0
Mode:                   G.DMT
TPS-TC:                 ATM Mode
Trellis:                ON
Line Status:            No Defect
Training Status:        Showtime
                Down            Up
SNR (dB):        6.6             6.0
Attn(dB):        56.0            31.5
Pwr(dBm):        18.3            12.6
                        G.dmt framing
K:              131(0)          20
R:              6               16
S:              1               8
D:              64              2
                        Counters
                        Path 0
SF:             8377            8312
SFErr:          1               0
RS:             569570          70652
RSCorr:         52              0
RSUnCorr:       9               0

                        Path 0
HEC:            1               0
OCD:            0               0
LCD:            0               0
Total Cells:    1394767         0
Data Cells:     1975            0
Drop Cells:     0
Bit Errors:     392             0

ES:             1               0
SES:            0               0
UAS:            49              49
AS:             136

                        Path 0
INP:            1.40            0.72
PER:            1.75            1.75
delay:          16.00           4.00
OR:             32.00           32.00

Bitswap:        6               0

#

I am currently running with the faceplate removed but I noticed it was not perfectly flush. Upon further investigation, there appears to be loads of 'connection joints' wedged inside the master socket. They are all now disconnected but it makes me question the quality of the terminations natively to the master...

Favouring brevity, what currently appears to be working for me, although far from completely fixed:

1. Removed faceplate
-Not sure how much this helped or is currently hindering. It appears to be an XTE 2005 Clone, identical to 'our equivalent' pictured here: http://www.run-it-direct.co.uk/xte2005cloneadslfaceplate.html

2. Shielded RJ11 cable
-Bought 3 of them from here: http://www.tandyonline.co.uk/high-speed-rj11-dsl-cable-0-5m.html

3. +1dB extra DS SNRM
-Via the handy option in DSLstats. I love this tool. Pretty sure it was this combined with the shielded cable that got the interleaving level dropped, before I realised the DECT was shafting me.

4. Removed DECT phone from line
-It was permanently robbing 0.3dB SNRM. If the TV was turned on, it became even greedier and took 1.3dB! It was in close proximity to the TV and the master socket, though.

5. xdslcmd configure --CoMinMgn on --i24k off --phyReXmt 0x3 --monitorTone off --dynamicD off --dynamicF off
-Although I couldn't replicate it every time, turning i24k off seems to reduce my interleaving depth. Drastically*.
-I enabled PhyR for both downstream and upstream, mostly for the lols. It was already enabled for upstream and who knows what features these various DSLAMs support these days. Broadcom might have licensed the feature to Infineon for all I know! :)
-I left CoMinMgn on, can't remember why. Well played my documentation skills!
-I turned the last three off on the basis I have no idea what they do. I also found another post on here with a very similar connection string so robbed most of that. Cheers whoever posted it :)


My current stats - connection online for 9 days and 11 hours - pretty sure that is a record for this line! Ping is now 24ms to bbc.co.uk at it's best and my gaming ping is considerably lower as a result. I'm still hopeless at all the games I play but meh :P



Code: [Select]
xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 8000
Max: Upstream rate = 816 Kbps, Downstream rate = 4684 Kbps
Channel: Interleaved, Upstream rate = 640 Kbps, Downstream rate = 3904 Kbps

Link Power State: L0
Mode: G.DMT
TPS-TC: ATM Mode
Trellis: ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 7.5 6.0
Attn(dB): 56.5 31.5
Pwr(dBm): 18.4 12.6
G.dmt framing
K: 123(0) 21
R: 8 16
S: 2 8
D: 8 2
Counters
Path 0
SF: 48101578 48102197
SFErr: 10285 0
RS: 1635453643 408868674
RSCorr: 260454 0
RSUnCorr: 73108 0

Path 0
HEC: 51267 0
OCD: 489 0
LCD: 489 0
Total Cells: 3234241830 0
Data Cells: 474260267 0
Drop Cells: 0
Bit Errors: 4078306 0

ES: 3502 0
SES: 105 0
UAS: 214 214
AS: 816229

Path 0
INP: 0.25 0.69
PER: 1.75 1.75
delay: 4.00 4.00
OR: 32.00 32.00

Bitswap: 1079 1633

Total time = 1 days 12 hours 3 min 14 sec
FEC: 263578 0
CRC: 10292 0
ES: 3502 0
SES: 105 0
UAS: 214 214
LOS: 0 0
LOF: 0 0
Latest 15 minutes time = 3 min 14 sec
FEC: 8 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
Previous 15 minutes time = 15 min 0 sec
FEC: 200 0
CRC: 11 0
ES: 7 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
Latest 1 day time = 12 hours 3 min 14 sec
FEC: 6358 0
CRC: 302 0
ES: 156 0
SES: 3 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
Previous 1 day time = 24 hours 0 sec
FEC: 53685 0
CRC: 1721 0
ES: 399 0
SES: 23 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
Since Link time = 9 days 11 hours 8 min 57 sec
FEC: 260454 0
CRC: 10285 0
ES: 3497 0
SES: 105 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
#


TODO:

1. Find out why I can't negotiate ADSL2 - I appear to be connected to a TT LLU DSLAM.
2. Figure out the weirdness in my HLOG
3. Fastpath time? :)

Note spikey upstream HLOG and weird slow peak on downstream start tones:




I wonder what my chances are of getting TT/BTOR to check the socket and the PCP?
Hopefully a quick job for someone but if there happens to be a finer strand of copper... :D




*interleaving did actually back itself off (down to 8 / 2 ) before I started messing with the command line options but shortly after went back up to 32 / 2.
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boost

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Re: A dodgy ADSL connection - an update
« Reply #1 on: August 22, 2014, 11:54:04 AM »

Comments, criticisms or meandering thoughts welcome :)
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burakkucat

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Re: A dodgy ADSL connection - an update
« Reply #2 on: August 22, 2014, 05:12:53 PM »

Er . . . I'm not sure what to say!  ::)

In terms of configuring the service as ADSL2 (as distinct to G.DMT or ADSL2+) it should be configurable via the modem/router's settings. For my HG622, the relevant page looks as the screenscrape, attached below.
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Re: A dodgy ADSL connection - an update
« Reply #3 on: August 24, 2014, 02:11:04 PM »

Mines a little more spikey ;D
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boost

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Re: A dodgy ADSL connection - an update
« Reply #4 on: August 24, 2014, 04:40:10 PM »

Er . . . I'm not sure what to say!  ::)

In terms of configuring the service as ADSL2 (as distinct to G.DMT or ADSL2+) it should be configurable via the modem/router's settings. For my HG622, the relevant page looks as the screenscrape, attached below.

Cheers! Appears to make no difference, with either modem.




Mines a little more spikey ;D

That is shocking! What's your upstream SNRM graph look like? Flat lined by any chance? I am almost tempted to disable PhyR to see if mine goes wonky.
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burakkucat

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Re: A dodgy ADSL connection - an update
« Reply #5 on: August 24, 2014, 07:13:41 PM »

Just for amusement, here is the Hlog graph for my line --
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Re: A dodgy ADSL connection - an update
« Reply #6 on: August 25, 2014, 06:28:21 PM »

Quote
That is shocking! What's your upstream SNRM graph look like? Flat lined by any chance? I am almost tempted to disable PhyR to see if mine goes wonky.
Yeah as router doesn't display upstream fluctuations  :(
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boost

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Re: A dodgy ADSL connection - an update
« Reply #7 on: August 26, 2014, 02:47:10 PM »

Quote
That is shocking! What's your upstream SNRM graph look like? Flat lined by any chance? I am almost tempted to disable PhyR to see if mine goes wonky.
Yeah as router doesn't display upstream fluctuations  :(

You've got a BDCM modem, yeh? I notice I have quite a few upstream bitswaps but as you say, very little in the way of upstream stats.

As an aside, I appear to have lost synch around 15 hours ago and despite maintaining it for 14 days, interleave depth is back up to 32 on the DS and INP has been whacked back up too. I also appear to have resynched at 3.3Mb instead of 3.9Mb.

Current stats for the thread:

Code: [Select]

xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 8000
Max: Upstream rate = 780 Kbps, Downstream rate = 4752 Kbps
Channel: Interleaved, Upstream rate = 608 Kbps, Downstream rate = 3392 Kbps

Link Power State: L0
Mode: G.DMT
TPS-TC: ATM Mode
Trellis: ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 10.3 6.0
Attn(dB): 56.0 31.5
Pwr(dBm): 18.3 12.6
G.dmt framing
K: 107(0) 20
R: 14 16
S: 2 8
D: 32 2
Counters
Path 0
SF: 3225293 3225339
SFErr: 202 0
RS: 109659929 27414378
RSCorr: 12852 0
RSUnCorr: 6050 0

Path 0
HEC: 5234 0
OCD: 58 0
LCD: 58 0
Total Cells: 438627257 0
Data Cells: 51411865 0
Drop Cells: 0
Bit Errors: 351520 0

ES: 5406 0
SES: 293 0
UAS: 237 237
AS: 54719

Path 0
INP: 1.96 0.72
PER: 1.75 1.75
delay: 16.00 4.00
OR: 32.00 32.00

Bitswap: 20 359

Total time = 1 days 15 hours 41 min 6 sec
FEC: 447926 0
CRC: 22675 0
ES: 5406 0
SES: 293 0
UAS: 237 237
LOS: 0 0
LOF: 0 0
Latest 15 minutes time = 11 min 6 sec
FEC: 18 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
Previous 15 minutes time = 15 min 0 sec
FEC: 28 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
Latest 1 day time = 15 hours 41 min 6 sec
FEC: 31080 0
CRC: 1965 0
ES: 45 0
SES: 29 0
UAS: 23 23
LOS: 0 0
LOF: 0 0
Previous 1 day time = 24 hours 0 sec
FEC: 37930 0
CRC: 929 0
ES: 340 0
SES: 12 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
Since Link time = 15 hours 13 min 50 sec
FEC: 12852 0
CRC: 202 0
ES: 10 0
SES: 4 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
#


Everything else looks mostly the same bar the excess SNR on tone 61 / 263KHz~.
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Re: A dodgy ADSL connection - an update
« Reply #8 on: August 26, 2014, 09:40:44 PM »

Boost thr connection drops every few mi utes to hours when activated,  so honestky cant tell. 8)
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boost

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Re: A dodgy ADSL connection - an update
« Reply #9 on: August 26, 2014, 10:37:30 PM »

I disabled PhyR on the upstream earlier. No difference. Upstream remains nailed.

Seems like there may be a general TT problem tonight? Most erratic ping I've ever had.
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