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Attenuation and line sync speed

periodical
Newbie
Posts: 3
Registered: 05-08-2016

Attenuation and line sync speed

Hi,

We recently had our Plusnet broadband line installed and are getting lower line sync speeds than expected, especially given the attenuation readings.

I rang the support line to check if everything was set up correctly and they reset the line. As far as I can tell this resulted in interleaving being enabled and the downstream sync speed increasing slightly, but no other significant changes.

The stats from the modem are as follows (note that I'm pretty sure some of these are mislabelled, it looks like the FECS values are the raw FEC counters for example):

ATU-C Vendor ID:                          Texas Instruments 5.16
ATU-C System Vendor ID:                   Texas Instruments 0.81
Chipset:                                  Ifx-AR9 1.2
Firmware Version:                         4.5.4.9.1.1
API Version:                              3.24.4.4
XTSE Capabilities:                        0x0, 0x0, 0x0, 0x0, 0x0, 0x1, 0x0, 0x0
Annex:                                    A
Line Mode:                                G.992.5 (ADSL2+)
Line State:                               UP [0x801: showtime_tc_sync]
Forward Error Correction Seconds (FECS):  Near: 83212 / Far: 245
Errored seconds (ES):                     Near: 262 / Far: 580
Severely Errored Seconds (SES):           Near: 3 / Far: 80
Loss of Signal Seconds (LOSS):            Near: 3 / Far: 73
Unavailable Seconds (UAS):                Near: 90 / Far: 90
Header Error Code Errors (HEC):           Near: 1045 / Far: 643
Power Management Mode:                    L0 - Synchronized
Latency / Interleave Delay:               Down: Interleave (8.0 ms) / Up: Interleave (2.50 ms)
Data Rate:                                Down: 8.852 Mb/s / Up: 1.134 Mb/s
Line Attenuation (LATN):                  Down: 22.6dB / Up: 10.8dB
Signal Attenuation (SATN):                Down: 20.6dB / Up: 10.8dB
Noise Margin (SNR):                       Down: 5.4dB / Up: 5.7dB
Aggregate Transmit Power (ACTATP):        Down: 20.4dB / Up: 12.8dB
Max. Attainable Data Rate (ATTNDR):       Down: 9.248 Mb/s / Up: 22.216 Mb/s
Line Uptime Seconds:                      182197
Line Uptime:                              2d 2h 36m 37s

From what I can tell we should be getting higher downstream sync speeds with attenuation numbers like these. Before I go back to support, could someone confirm if this is indeed the case or if this just the best the line can deliver?

Thanks!

4 REPLIES
Plusnet Help Team
Plusnet Help Team
Posts: 4,956
Thanks: 419
Fixes: 152
Registered: 01-01-2012

Re: Attenuation and line sync speed

Can you PM me your username?

If this post resolved your issue please click the 'This fixed my problem' button
 Matthew Wheeler
 Plusnet Help Team
periodical
Newbie
Posts: 3
Registered: 05-08-2016

Re: Attenuation and line sync speed

Done!

Plusnet Help Team
Plusnet Help Team
Posts: 4,956
Thanks: 419
Fixes: 152
Registered: 01-01-2012

Re: Attenuation and line sync speed

Thanks. Our tests aren't showing any issues but we'd recommend raising this at https://faults.plus.net so our Faults team can take a further look.

If this post resolved your issue please click the 'This fixed my problem' button
 Matthew Wheeler
 Plusnet Help Team
periodical
Newbie
Posts: 3
Registered: 05-08-2016

Re: Attenuation and line sync speed

Will do. Thanks for taking a look!