FTTC Speed Reduction

Been on infinity2 for several months now new to our area and have been enjoying full speed, now noticed regular speed tests with think broadband and speedtest.net showing around 60meg.

Its a10% drop line profile set at 76mb according to bt wholesale line test.

Is this possible due to customer take up causing crosstalk/interference on my line or another reason btw 300m from fttc.

Regards

Cross talk would give you a lower sync rate, and hence a lower IP profile, which you don't have.

Perhaps its time to unlock that modem if it's an HG612, if it isn't you can get one off eBay.

You'll then be able to get the stats and see whats going on, or at least if you post them someone will take a look for you.

well heres the stats from the modem previous was 106 attanable and full sync rate.

Connection Status
Help
Mode VDSL2
Traffic type PTM
DSL synchronization status Up
DSL up time 750

Line Status
Help
Downstream Upstream
Attainable rate (kbit/s) 76244 25057
SNR margin (dB) 6.2 9.2
Line attenuation (dB) 0 0
Output power (dBmV) 13.6 6.6

Statistics
Help

Path 0

Path 1
Downstream Upstream Downstream Upstream
Line rate (kbit/s) 63529 20000 0 0
CRC errors 0 0 0 0
FEC errors 0 0 0 0
HEC errors 0 0 0 0

Looks like you have FEC & interleaving turned on, presumably caused by the rate of errors that you were incurring. This will eat a chunk of the attainable - usually around 20% - and add a chunk onto the latency - usually 8ms.

Can you get the output from a telnet session, and leave the modem running a while before you take the stats? It'd be useful to see the error rates.

The output from the "--pbParams" option and the "--stats" option would be best.

Yes ping rate seams to have increased.

how do u output a telnet session do I need to install any software.

Managed to get telnet up and running. I want to plot graphs and stuff. downloaded apps can they run standalone from dos window tool supplied connecting to the 192.168.1.1 address

Or do i have it all wrong.

The telnet app is good for getting detailed text out, for reference later and for posting here.

However, the long-term logging/graphing apps are good for making graphs to visualise the changes - either as one-shot snapshots, or regular polling. There are two around, but I don't have the links to either...

One is from Bald_Eagle, which I use, and the other (I think) is DSLStats.

Hopefully someone will give you the links...

In reply to a post by WWWombat:

<snip>
Hopefully someone will give you the links...

DSLstats

HG612 Modem Stats 1.0

manged to get --stats here it is this was taken after hub and modem power down 5 minutes

xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Max: Upstream rate = 24741 Kbps, Downstream rate = 76656

Kbps
Path: 0, Upstream rate = 20000 Kbps, Downstream rate =

63863 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): 6.2 9.3
Attn(dB): 0.0 0.0
Pwr(dBm): 13.6 6.7
VDSL2 framing
Path 0
B: 43 236
M: 1 1
T: 64 5
R: 12 16
S: 0.0219 0.3771
L: 20443 5410
D: 1773 1
I: 56 255
N: 56 255
Counters
Path 0
OHF: 617174 142208
OHFErr: 0 0
RS: 157996190 649080
RSCorr: 498 6
RSUnCorr: 0 0

Path 0
HEC: 0 0
OCD: 0 0
LCD: 0 0
Total Cells: 106694676 0
Data Cells: 19889 0
Drop Cells: 0
Bit Errors: 0 0

ES: 0 0
SES: 0 0
UAS: 22 22
AS: 871

Path 0
INP: 4.00 0.00
PER: 1.40 6.12
delay: 10.00 0.00
OR: 136.89 203.67

Bitswap: 79 0

Total time = 14 min 54 sec
FEC: 498 6
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 22 22
LOS: 0 0
LOF: 0 0
Latest 15 minutes time = 14 min 54 sec
FEC: 498 6
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 22 22
LOS: 0 0
LOF: 0 0
Previous 15 minutes time = 0 sec
FEC: 0 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
Latest 1 day time = 14 min 54 sec
FEC: 498 6
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 22 22
LOS: 0 0
LOF: 0 0
Previous 1 day time = 0 sec
FEC: 0 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
Since Link time = 14 min 31 sec
FEC: 498 6
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
#

Not a lot of time, but you certainly have FEC/interleaving on.

DLM has allowed a maximum delay of 10ms, and has set an INP of 4.00. Those figures are both slightly higher than the standard (which is 3.00 and 8ms), suggesting you are experiencing more interference than the norm, and were getting too many errors.

The overhead applied by FEC is 12/56, or 21.5% of the bandwidth, which will explain a drop in sync speed.

Turning the OR modem on and off all the time will not do your connection any good whatsoever, I did it because I had a flaky connection, ended up far worse than the initial installation, went do from 74 Mbps to 58 Mbps, and since it was just at the level that I was promised before having it all installed there was nothing I could do, I did eventually have an IP profile reset after X visits from OR, and that was only because the DLM gave me a ping of 35ms + and latency and jitter became a real issue, it to 12ms but now settled at 20ms and my speeds are 73.5 Mbps and 19.9 Mbps, and thats real time speeds, not a speed test.

Good luck, just leave it alone for about 1 - 2 months then complain.

Edited by deleted (Fri 05-Jul-13 09:39:04)

There's definitely a reduction in speed and timing performance i will give it a week and re test the stats. average ping rate was around 25ms before issues now its 35-40 i may contact openreach but there is people in my street getting fttc services so it may be crosstalk.

Thanks guys for the help and advice the reduction in speed ain't a huge issue but ping rate as well not too pleased about.

Regards
George

My Latest Stats can anyone confirm line state/any faults

# xdslcmd info --state
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 2
Max: Upstream rate = 22566 Kbps, Downstream rate = 71372 Kbps
Path: 0, Upstream rate = 20000 Kbps, Downstream rate = 67289 Kbps

# xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 2
Max: Upstream rate = 22611 Kbps, Downstream rate = 71372 Kbps
Path: 0, Upstream rate = 20000 Kbps, Downstream rate = 67289 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): 4.1 6.5
Attn(dB): 0.0 0.0
Pwr(dBm): 13.6 5.9
VDSL2 framing
Path 0
B: 63 236
M: 1 1
T: 64 5
R: 16 16
S: 0.0303 0.3771
L: 21146 5410
D: 1067 1
I: 80 255
N: 80 255
Counters
Path 0
OHF: 42262510 1846098
OHFErr: 192 111
RS: 3819434301 969844
RSCorr: 2175188 707
RSUnCorr: 11774 0

Path 0
HEC: 4422 0
OCD: 0 0
LCD: 0 0
Total Cells: 3677172700 0
Data Cells: 17944341 0
Drop Cells: 0
Bit Errors: 0 0

ES: 179 3091
SES: 20 0
UAS: 459 459
AS: 61640

Path 0
INP: 3.00 0.00
PER: 1.45 6.12
delay: 8.00 0.00
OR: 115.64 203.67

Bitswap: 11379 49

Total time = 1 days 18 hours 20 min 17 sec
FEC: 6441517 63228
CRC: 14344 3528
ES: 179 3091
SES: 20 0
UAS: 459 459
LOS: 12 0
LOF: 20 0
Latest 15 minutes time = 5 min 17 sec
FEC: 1542 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: 7407 10
CRC: 0 1
ES: 0 1
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
Latest 1 day time = 18 hours 20 min 17 sec
FEC: 2178668 776
CRC: 3396 116
ES: 19 88
SES: 5 0
UAS: 128 128
LOS: 4 0
LOF: 5 0
Previous 1 day time = 24 hours 0 sec
FEC: 660772 10147
CRC: 216 360
ES: 48 240
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
Since Link time = 17 hours 7 min 19 sec
FEC: 2175188 707
CRC: 192 111
ES: 14 83
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
#

LOS: 12 0
LOF: 20 0

Ouch. SNR looks bad too. --pbParams may give further info.

How do you get --pbparams

xdslcmd info --pbParams

Thanks here's pbparams


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 --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 2
Max: Upstream rate = 22611 Kbps, Downstream rate = 71372 Kbps
Path: 0, Upstream rate = 20000 Kbps, Downstream rate = 67289 Kbps

Discovery Phase (Initial) Band Plan
US: (0,95) (880,1195) (1984,2771)
DS: (32,859) (1216,1959) (2792,4083)
Medley Phase (Final) Band Plan
US: (0,95) (880,1195) (1984,2771)
DS: (32,859) (1216,1959) (2792,4083)
VDSL Port Details Upstream Downstream
Attainable Net Data Rate: 22611 kbps 71372 kbps
Actual Aggregate Tx Power: 5.9 dBm 13.7 dBm
============================================================================
VDSL Band Status U0 U1 U2 U3 D1 D2 D3
Line Attenuation(dB): 2.1 14.8 31.6 N/A 11.0 25.9 42.0

Signal Attenuation(dB): 2.1 14.8 31.4 N/A 11.0 25.9 42.0

SNR Margin(dB): 6.7 6.5 6.5 N/A 4.1 4.1 4.1

TX Power(dBm): -5.2 -27.1 5.6 N/A 10.9 7.3 7.4

#

Looks ok - you're firing on all cylinders. Just a bit noisy.

Thanks for checking 60 meg is still is a good speed maybe it will improve if vectoring is introduced.

Regards

The LOS/LOF isn't from the link time and is normal. You have 0 and is not a problem at alll...