[asterisk-users] HDLC Bad FCS (8) on Primary D-channel

[Karsten Wemheuer]

Hi,

Am Freitag, den 11.06.2010, 11:54 +0100 schrieb Gareth Blades:
> Olivier wrote:
> > Hello,
> > 
> > I've got a running system in which logs are full of messages such as:
> > [Jun 10 07:24:14] NOTICE[2414] chan_dahdi.c: PRI got event: HDLC Bad FCS 
> > (8) on Primary D-channel of span 2
> > 
> > The strange thing is those messages are coming from a single span.
> > 
> > My setup is :
> > 
> > Asterisk 1.6.1.18
> > Junghanns OctoBRI
> > with wcb4xxp driver
> > libpri 1.4.10.2
> > dahdi 2.3.0
> > 3 BRI lines in PtMP mode
> > 
> > 
> > What does this "PRI got event: HDLC Bad FCS (8) on Primary D-channel of 
> > span 2" roughly mean ?
> > Why could it happen on a single port and not on the others ?
> > 
> > Regards
> Basically it means that one of the messages it received on the PRI D 
> channel failed the checksum.
> 
> I take it that in your span command you have 'crc4' or similar specified 
> as an option for all of your spans?
> 
> If thats the case its probably a faulty port on the card, cable, or a 
> card in the local telephone exchange,

AFAIK CRC4 is for PRI only. The setup of Olivier is BRI in PTmP mode.
Many providers drive Layer 1 down in case of inactivity. Maybe the
driver has a problem with such lines. In this case talk to your provider
to disable this setting.

HTH,

Karsten