[OpenWrt-Devel] Frequent adsl disconnections with BTHOMEHUBV2B (lantiq xway danube)

[Jaime T]

Hi all.

I'm running "barrier breaker" (r42625) on a BTHOMEHUBV2B and it's
great apart from frequent adsl disconnections (approx 40 per day). My
adsl-type is POTS so the relevant part of /etc/config/network is:

config adsl 'dsl'
        option annex 'a2p'
        option firmware '/lib/firmware/adsl.bin'

Each disconnection puts approximately the following into the syslog:

Fri Nov 14 09:33:41 2014 daemon.info pppd[1218]: No response to 5 echo-requests
Fri Nov 14 09:33:41 2014 daemon.notice pppd[1218]: Serial link appears
to be disconnected.
Fri Nov 14 09:33:41 2014 daemon.info pppd[1218]: Connect time 28.9 minutes.
Fri Nov 14 09:33:41 2014 daemon.info pppd[1218]: Sent 554487 bytes,
received 6119357 bytes.
Fri Nov 14 09:33:41 2014 daemon.notice netifd: Network device
'pppoa-wan' link is down
Fri Nov 14 09:33:41 2014 daemon.notice netifd: Interface 'wan' has
lost the connection
Fri Nov 14 09:33:47 2014 daemon.notice pppd[1218]: Connection terminated.
Fri Nov 14 09:33:47 2014 daemon.notice pppd[1218]: Modem hangup
Fri Nov 14 09:33:58 2014 kern.warn kernel: [ 1832.784000] leave showtime
Fri Nov 14 09:33:59 2014 daemon.info pppd[1218]: Terminating on signal 15
Fri Nov 14 09:33:59 2014 daemon.info pppd[1218]: Exit.
Fri Nov 14 09:33:59 2014 daemon.notice netifd: Interface 'wan' is now down
Fri Nov 14 09:34:27 2014 kern.err kernel: [ 1861.796000]
[DSL_BSP_Showtime 894]: Datarate US intl = 924903, fast = 0
Fri Nov 14 09:34:27 2014 kern.warn kernel: [ 1861.800000] enter
showtime, cell rate: 0 - 2181, 1 - 2181, xdata addr: 0x82b00000
Fri Nov 14 09:34:29 2014 daemon.notice netifd: Interface 'wan' is setting up now

My line stats are:

# /etc/init.d/dsl_control status
Chipset:                Ifx-Danube 1.3
Line State:             UP [0x801: showtime_tc_sync]
Data Rate:              7.040 Mb/s / 924 Kb/s
Line Attenuation:       37.4dB / 21.2dB
Noise Margin:           7.1dB / 10.0dB
Line Uptime:            25m 39s

The disconnections happen more frequently at night time. I have
several of these boxes, and they all exhibit the same behaviour so I
do not believe that it is a hardware problem specific to 1 router. I
also have the original "sky"-supplied router which does not suffer
from these disconnections.

The dsl connection appears to be a bit of a "black-box" - I can find
very little documentation discussing it, although 1 or 2 people have
mentioned XTU bits, which I don't understand.

Is there anything that I can modify to try to stop these
disconnections from happening? Would lowering the connection speed
help, and if so, can this be done?

All info/suggestions would be gratefully received. With kind regards,

Jaime
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