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

[Jaime T]

On 17 November 2014 18:36, Sebastian Moeller <moeller0 at gmx.de> wrote:
> Hi Jaime,
> maybe you should also look at the rror counters. Especially the CRC and HEC errors short before the connection drops might be interesting.
> Best Regards
>         Sebastian

Hi everyone.

I've set lcp-echo-failure to "10" and lcp-echo-interval to "3" and I'm
still getting the disconnections. The logs fill with the following
now:

Thu Nov 20 15:29:55 2014 kern.warn kernel: [15746.372000] leave showtime
Thu Nov 20 15:29:56 2014 daemon.info pppd[7651]: Terminating on signal 15
Thu Nov 20 15:29:56 2014 daemon.info pppd[7651]: Connect time 6.0 minutes.
Thu Nov 20 15:29:56 2014 daemon.info pppd[7651]: Sent 89186 bytes,
received 46470 bytes.
Thu Nov 20 15:29:56 2014 daemon.notice netifd: Network device
'pppoa-wan' link is down
Thu Nov 20 15:30:01 2014 daemon.notice netifd: Interface 'wan' is now down
Thu Nov 20 15:30:11 2014 daemon.warn dnsmasq[1503]: no servers found
in /tmp/resolv.conf.auto, will retry
Thu Nov 20 15:30:24 2014 kern.err kernel: [15775.136000]
[DSL_BSP_Showtime 894]: Datarate US intl = 924903, fast = 0
Thu Nov 20 15:30:24 2014 kern.warn kernel: [15775.140000] enter
showtime, cell rate: 0 - 2181, 1 - 2181, xdata addr: 0x82e90000
Thu Nov 20 15:30:26 2014 daemon.notice netifd: Interface 'wan' is setting up now
Thu Nov 20 15:30:26 2014 daemon.info pppd[7835]: Plugin pppoatm.so loaded.
Thu Nov 20 15:30:26 2014 daemon.info pppd[7835]: PPPoATM plugin_init
Thu Nov 20 15:30:26 2014 daemon.info pppd[7835]: PPPoATM
setdevname_pppoatm - SUCCESS:0.38
Thu Nov 20 15:30:26 2014 daemon.notice pppd[7835]: pppd 2.4.7 started
by root, uid 0
Thu Nov 20 15:30:26 2014 daemon.info pppd[7835]: Using interface pppoa-wan

Perhaps the "lcp echo request" thing just be a red herring caused by
the dsl link losing sync?

I've also tried to find some info on how to get the error counters out
for the lantiq dsl connection (using dsl_cpe_control), and the best
info I can get hold of is:

pmcctg 0 0
nReturn=15 nChannel=0 nDirection=0 nElapsedTime=18031 bValid=1
nCodeViolations=14662 nFEC=5910810

pmdpctg 0 0
nReturn=15 nChannel=0 nDirection=0 nElapsedTime=18058 bValid=1
nHEC=10735 nTotalCells=256128475 nUserTotalCells=1896600 nIBE=0
nTxUserTotalCells=0 nTxIBE=0

pmlsc1dg 0 0
nReturn=15 nDirection=0 nHistoryInterval=0 nElapsedTime=58145 bValid=1
nES=432 nSES=256 nLOSS=22 nUAS=2433 nLOFS=1868

The problem I now have is that I don't know how to interpret these
results: are they good, or bad? (And do they explain why I'm getting
dozens of disconnections every day?)

Does anyone know if I can force a slower/lower connection speed from
my side? (I would happily sacrifice some speed for more stability!) If
not, I'm going to have to buy a dsl modem with a broadcom chipset and
use that instead...

J :-)
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