I also have my Modem Lan2 port plugged in to an adjacent switch (Router ports all in use). I did however change the Modems Lan2 port IP to 192.168.1.1 as my router is 192.168.1.1

Nice one, has it's use I guess. Not sure what my routers are on but must be something different.

No more messing around doing BT speedtests to get the information.

the modem is on 192.168.1.1 and your router as well, must work I guess or did I understand wrong,

Nice to see what happens when it is speeded up, will get more than the 30mbs I hope as it did do more in summer but slowed up and now stuck at 7 less than it once did. see what next year brings when upto 80.

Only 400m line as the blokes box of tricks said when testing the line last saturday

In reply to a post by Daniel_g:

the modem is on 192.168.1.1 and your router as well, must work I guess or did I understand wrong,

No, that would not work, two devices on the same network cannot have the same IP. I changed the modems LAN IP to 192.168.1.2 (you can change it from the web interface).

Hi Daniel,

The gradual drop in bandwidth that you have experienced could be due to crosstalk from other xDSL pairs that share the same cable bundle as yours.

The full line statistics output from the xdslcmd tool in the Huawei firmware (which you can only access through telnet or ssh) should indicate whether that is the case.

As more subscribers sign up to FTTC, the issues of crosstalk can only worsen. The noise-limiting factor from crosstalk is the single greatest weakness of xDSL, and the higher frequencies used in VDSL2 are particularly susceptible to inductance noise.

In his excellent MSc thesis on xDSL loop qualification [1], Matthias Ernelli discusses pair twisting used in a cable bundle and how it can mitigate the inter-pair electromagnetic coupling (crosstalk). Cable Twisting is a science in itself!

Yaakov Stein, the chief scientist at RAD Data Comms has published a very informative set of slides to accompany his short course of lectures "An Introduction to xDSL". The issue of crosstalk is illustrated very clearly. [2]

Cheers,
A

[1] http://www.ee.kth.se/php/modules/publications/report...

[2] http://www.dspcsp.com/lectures/

Put the unlocked SP10 firmware on to my 2B modem today, no issues encountered what so ever.

Changed IP from 192.168.1.1 to an address in my 192.168.0.0/24 subnet

Observations so far;

1. I'm on profile 17a
2. Turn off QoS makes no difference to download speed tests, upload showed a 150kbps improvement
3. My max download speed is less than what I was getting for the first 3 months I was connected (profile of 32mbps, speed tests at 30mbps), perhaps cross talk?
4. If Plusnet increase upload speed I'm in for a nice wee bump up
5. The length of my line tells me I'd be silly in future to pay for an 80/20 product as I would not see any difference (line length is 950 metres, all underground copper)


Output from xdslcmd info --show

xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Max: Upstream rate = 6010 Kbps, Downstream rate = 29024 Kbps
Path: 0, Upstream rate = 1999 Kbps, Downstream rate = 27399 Kbps

Link Power State: L0
Mode: VDSL2 Annex B
VDSL2 Profile: Profile 17a
TPS-TC: PTM Mode
Trellis: U:ON /D:ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 6.8 14.9
Attn(dB): 0.0 0.0
Pwr(dBm): 12.4 -1.8

Hello

All you stuff is good and did it ok after working out the telnet command of open before the modem address. Easy when worked out that took a bit of messing around.

nice to get into it.

Did have the guys come and repare the duff phone line that every now and then crackles when talking to someone. Next door garden patio lifted up to get to the buried junction box (clever then to hide under stuff, not), they did and still not happy so drop wire from grey box on the wall up to house in the roof wire was replaced. All ok now so guess it was that. Maybe not then and more people being added.

Was good when I had not 2 weeks of it starting up here and being turned on in Abingdon. One of the first I guess months ago, might get a bit more when it goes over to the better speed, will will see. Like the links, something to read later.

Thank you.
from Daniel

Mode VDSL2
Traffic type PTM
DSL synchronization status Up
DSL up time 121226


Line Status Help



Downstream Upstream
Attainable rate (kbit/s) 38924 16129
SNR margin (dB) 8 26.6
Line attenuation (dB) 0 0
Output power (dBmV) 4.7 -11.1


Statistics Help



Path 0 Path 1
Downstream Upstream Downstream Upstream
Line rate (kbit/s) 31399 1999 0 0
CRC errors 3753 0 0 0
FEC errors 141 0 0 0
HEC errors 1074 0 0 0

What I got from the modem, hopefully better one day next year when it all changes, but not if I have to pay more, £18 month enough, tight git!

--------------------------------------------------------------------------
From Modem on the telnet thing just now, First time I have seen the profile thing copying what was typed in the entry above, I am not sure what to do but can copy people!.

Welcome Visiting Huawei Home Gateway
Copyright by Huawei Technologies Co., Ltd.
Login:admin
Password:
ATP>sh


BusyBox v1.9.1 (2010-10-15 17:59:06 CST) built-in shell (ash)
Enter 'help' for a list of built-in commands.

# xdslcmd info --show
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Max: Upstream rate = 16149 Kbps, Downstream rate = 38836 Kbps
Path: 0, Upstream rate = 1999 Kbps, Downstream rate = 31399 Kbps

Link Power State: L0
Mode: VDSL2 Annex B
VDSL2 Profile: Profile 8c
TPS-TC: PTM Mode
Trellis: U:ON /D:ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 7.9 26.7
Attn(dB): 0.0 0.0
Pwr(dBm): 4.7 -11.1
VDSL2 framing
Path 0
B: 69 31
M: 1 2
T: 64 36
R: 16 16
S: 0.0709 0.9922
L: 9699 645
D: 455 1
I: 86 80
N: 86 80
Counters
Path 0
OHF: 39219359 1240846
OHFErr: 147 0
RS: 3235198163 3529261
RSCorr: 35492081 0
RSUnCorr: 3774 0

Path 0
HEC: 1076 0
OCD: 0 0
LCD: 0 0
Total Cells: 3799959904 0
Data Cells: 3098761 0
Drop Cells: 0
Bit Errors: 0 0

ES: 43 0
SES: 0 0
UAS: 15 15
AS: 134062

Path 0
INP: 3.00 0.00
PER: 3.40 13.39
delay: 8.00 0.00
OR: 56.38 57.33

Bitswap: 21893 73

#
ATP>

Any good who knows.

Edited by deleted (Fri 04-Nov-11 20:51:32)

Done what was asked. Found the top link did work if I took the last bit off but then did not know what to look for, the powerpoint thing works ok on the 2nd one.

Nice.

Ok just unlocked my modem and loads of stuff on there! I take it nobody has altered anything too much for fear of causing issues?? Anyway here are my stats

# xdslcmd info --show
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Max: Upstream rate = 11743 Kbps, Downstream rate = 49780 Kbps
Path: 0, Upstream rate = 10000 Kbps, Downstream rate = 39996 Kbps

Link Power State: L0
Mode: VDSL2 Annex B
VDSL2 Profile: Profile 17a
TPS-TC: PTM Mode
Trellis: U:ON /D:ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 7.0 7.6
Attn(dB): 0.0 0.0
Pwr(dBm): 11.7 6.6
VDSL2 framing
Path 0
B: 57 111
M: 1 2
T: 64 50
R: 16 16
S: 0.0461 0.7101
L: 12835 2704
D: 701 1
I: 74 120
N: 74 240
Counters
Path 0
OHF: 1081810 270787
OHFErr: 4 0
RS: 207756069 652549
RSCorr: 60149 2
RSUnCorr: 140 0

Path 0
HEC: 35 0
OCD: 0 0
LCD: 0 0
Total Cells: 184946037 0
Data Cells: 280856 0
Drop Cells: 0
Bit Errors: 0 0

ES: 1 0
SES: 0 0
UAS: 401 401
AS: 2404

Path 0
INP: 3.00 0.00
PER: 2.21 8.87
delay: 8.00 0.00
OR: 86.72 55.88

Bitswap: 451 6

Now unless they do some more jiggery pokery with frequencies looking at the stats there would be no point in going for 80/20 and paying for it! My max would seem not a hell of alot more than what I'm on now.

Edited by deleted (Sat 05-Nov-11 10:10:25)

In reply to a post by MrGrumpy:

Ok just unlocked my modem and loads of stuff on there! I take it nobody has altered anything too much for fear of causing issues??

I have QOS turned off and that gets around another 1 Mbps Upload on speed tests. I have also connected port2 to my network, after changing the modem LAN IP so that it does not clash with my router.