You mean you've taken the stats from the master socket and compared them line by line?

Yes, I ran the stats again plugged into the socket, it's almost identical, as it also is with the filter face plate removed.

To be honest there is not much that can be done - you might have a degraded external line but that is probably unlikely and getting it checked will be a struggle.

You have to flag your concerns with your ISP now and as I suggested before tell them whether or not you want to cancel the contract - given the abysmal performance you should be able to (if you wish).

I'm a bit unsure about this.

The ECI modem speeds I assume are throughput from speed tests. The HG612 obviously has a major issue - where did you get it?

The estimates I believe to be sync speeds, but that's not the most important bit at the moment. I'd like to see what you get from a BT Performance test, using the ECI modem.

If you do that, please use the Diagnostic option on the left, and paste the full contents of the downstream and upstream results text boxes .

Details from the ECI below!

Download speed achieved during the test was - 4.32 Mbps
For your connection, the acceptable range of speeds is 3.24 Mbps-0 Mbps.
IP Profile for your line is - 4.63 Mbps

Upload speed achieved during the test was - 0.58Mbps
Additional Information:
Upstream Rate IP profile on your line is - 2 Mbps

The HG612 is a 3B from ebay, but the cabinet went live about 3 weeks ago, so I'm assuming its ECI there too. I needed something that could display line status!

Ummm . I was hoping for something a bit more encouraging from that. Thanks for trying, anyway.

Trouble with the HG612 you have is that if it is getting under half the ECI speeds, the line status from it isn't really much use.

What might have been interesting with it would have been the CLI telnet output from:-

xdslctl info --pbParams to see the Discovery phase compared to the actual. But probably not worth trying that. It could be just as unreliable. Have you tried a factory reset on the HG612? In fact on the ECI as well?

What does this checker give for the speed multiplier for your postcode, and applying that to your previous real ADSLx speed what do you get?

I've factory reset both devices, I got as far as a working serial output from the ECI, but sadly I was unable to send any characters via the serial connection to login.

Checker gives 4.57, compared with stable 4Mb adsl2 I would get 18.3

From a saved file with the HG612 last night:

# xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Max: Upstream rate = 614 Kbps, Downstream rate = 2372 Kbps
Path: 0, Upstream rate = 630 Kbps, Downstream rate = 2505 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)
DS: (32,859)
VDSL Port Details Upstream Downstream
Attainable Net Data Rate: 614 kbps 2372 kbps
Actual Aggregate Tx Power: 1.9 dBm 2.0 dBm
============================================================================
VDSL Band Status U0 U1 U2 U3 D1 D2 D3
Line Attenuation(dB): 10.4 70.0 66.3 N/A 30.3 0.1 65.7
Signal Attenuation(dB): 10.4 N/A N/A N/A 30.3 N/A N/A
SNR Margin(dB): 5.3 N/A N/A N/A 5.4 N/A N/A
TX Power(dBm): 1.9 N/A N/A N/A 2.0 N/A N/A

Anyone able to help interpret this graph?

I'm trying to understand why there are a bunch of channels in use at around 500 aka 2 MHz and a large gap down to the next one in use at 600 kHz - perhaps that's where the power/frequency mask cuts in for your line length.

on further reading it depends on the Cabinet Assigned Loss or CAL - if the cabinet is a long way from the exchange eg 50 dB attenuation at 300 kHz then the downstream power mask allows full power from about 600 kHz upwards. In this case the cutoff in action around 2M suggests a CAL of 30 so cabinet about 2-3km from exchange.

Edited by yarwell (Tue 08-Jan-13 18:21:21)

In reply to a post by MHC:

At that distance I am surprised they accepted the install.

Why do you say that?

I am more than a mile from the cabinet and the BT estimate was 10.7 down, 1.0 up.

Initially the sync was 39mb/sec, but in the nine months it has been live, the sync speed has dropped to 31mb/sec.

Because of the low estimate, BT refuse to let my ISP put me on a 40/10 profile, so I am stuck with a 2mb/sec uplink cap, though the attainable speeds are reported at 38 down, 6.8 up.

The various research and tests that I have seen suggests that for a line of over 1 mile then the data rate on a nice clean line without too much cross talk would be in the order of 10Mbps - the BT estimate is close. As for achieving 39Mbps - I would be suspicious of the distance.

I have several test reports filed away - including this one from Ericsson: scroll to the eighth page (43) and look at the Profile 17 Downstream - it appears to end at 700m but it may well follow the profile 12 line and at 1750m (1.1 miles) shows about 10Mbps.

There will be cases where the response is noticeably better but not by a factor of four.