[asterisk-users] PRI Problem

[Shaun Ruffell]

On Tue, Aug 16, 2011 at 10:31:54AM -0400, Eric Merkel wrote:
> I am having a problem with a new PRI turn-up on dahdi 2.5.0 and
> asterisk 1.8.5 that I have not seen before. The PRI is setup as B8ZS,
> ESF and the span shows up and ok. This PRI is merely a crossover T1
> going into an old DC0 class 5 switch.

I'm not familiar with this switch however...

> I am getting the following errors over and over again
> 
> [Aug 16 10:26:10] NOTICE[8002]: chan_dahdi.c:3043
> my_handle_dchan_exception: PRI got event: HDLC Bad FCS (8) on
> D-channel of span 1
> [Aug 16 10:26:10] NOTICE[8002]: chan_dahdi.c:3043
> my_handle_dchan_exception: PRI got event: HDLC Abort (6) on D-channel
> of span 1

Do these errors start right away or does it take a little bit of time
before they start appearing?

> I am also showing CRC4 errors on span as well.
> 
> # asterisk -rx "dahdi show status"
> Description                              Alarms  IRQ    bpviol CRC4
> Fra Codi Options  LBO
> T2XXP (PCI) Card 0 Span 1                OK      1      0      2938622
> ESF B8ZS          0 db (CSU)/0-133 feet (DSX-1)
> 
> I am leaning towards a misconfiguration on the span on the switch side
> but here is my setup. Can anyone point me in the right direction?
> 
> # dahdi_hardware
> pci:0000:06:08.0     wct4xxp+     d161:1220 Wildcard TE220 (5th Gen)
> 
> /etc/dahdi/system.conf
> # Span 1: TE2/0/1 "T2XXP (PCI) Card 0 Span 1" (MASTER) B8ZS/ESF ClockSource
> span=1,1,0,esf,b8zs
> # termtype: unknown
> bchan=1-23
> dchan=24
> echocanceller=mg2,1-23

You have this configured for the switch to provide you timing. Is the
switch really expecting to provide timing to the TE220?

> /etc/asterisk/chan_dahdi
> [channels]
> language=en
> context=Incoming-Pri
> switchtype=dms100
> signalling=pri_cpe
> group=1
> channel => 1-23
> 
> Thanks,
> Eric Merkel

-- 
Shaun Ruffell
Digium, Inc. | Linux Kernel Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
Check us out at: www.digium.com & www.asterisk.org