DAHDI error: Got DAHDI event: HDLC Bad FCS (8) on D-channel of span 1

Hi All,

I know error mentioned in subject line is very common, and there are many discussions found on net; but none of them clearly tell what is the solution for this and may vary case to case. So I am creating this new topic here.

My environment:
Ubuntu: 14.4 LS
Asterisk: 13.9.1
DAHDI version: 2.10.2 Echo Canceller
PRI version: 1.5.0
DAHDI hardware: Allocard 4aCP1e (3rd Gen) (alloPL4xxp+)

When I connect PRI line to above hardware, it seems D channel is not coming up and keeps throwing below error on CLI, but light turns green on DAHDI hardware card which indicates it is getting proper TX and RX signals.

[2016-08-08 10:39:24] NOTICE[4296]: chan_dahdi.c:2788 my_handle_dchan_exception: Got DAHDI event: HDLC Abort (6) on D-channel of span 1
[2016-08-08 10:39:25] NOTICE[4296]: chan_dahdi.c:2788 my_handle_dchan_exception: Got DAHDI event: HDLC Bad FCS (8) on D-channel of span 1
[2016-08-08 10:39:27] NOTICE[4296]: chan_dahdi.c:2788 my_handle_dchan_exception: Got DAHDI event: HDLC Abort (6) on D-channel of span 1
[2016-08-08 10:39:31] NOTICE[4296]: chan_dahdi.c:2788 my_handle_dchan_exception: Got DAHDI event: HDLC Bad FCS (8) on D-channel of span 1
[2016-08-08 10:39:32] NOTICE[4296]: chan_dahdi.c:2788 my_handle_dchan_exception: Got DAHDI event: HDLC Bad FCS (8) on D-channel of span 1

Below are some of the outputs:
[email protected]:~# dahdi_scan
[1]
active=yes
alarms=OK
description=T4XXP (PCI) Card 0 Span 1
name=ALLOPL4/0/1
manufacturer=Allo
devicetype=Allocard 4aCP1e (3rd Gen)
location=Board ID Switch 0
basechan=1
totchans=31
irq=0
type=digital-E1
syncsrc=0
lbo=0 db (CSU)/0-133 feet (DSX-1)
coding_opts=AMI,HDB3
framing_opts=CCS,CRC4
coding=HDB3
framing=CCS/CRC4

[email protected]:~# cat /proc/dahdi/1
Span 1: ALLOPL4/0/1 “T4XXP (PCI) Card 0 Span 1” (MASTER) CCS/HDB3/CRC4
CRC4 error count: 5361
E-bit error count: 1785

       1 ALLOPL4/0/1/1 Clear (In use)
       2 ALLOPL4/0/1/2 Clear (In use)
       3 ALLOPL4/0/1/3 Clear (In use)
       4 ALLOPL4/0/1/4 Clear (In use)
       5 ALLOPL4/0/1/5 Clear (In use)
       6 ALLOPL4/0/1/6 Clear (In use)
       7 ALLOPL4/0/1/7 Clear (In use)
       8 ALLOPL4/0/1/8 Clear (In use)
       9 ALLOPL4/0/1/9 Clear (In use)
      10 ALLOPL4/0/1/10 Clear (In use)
      11 ALLOPL4/0/1/11 Clear (In use)
      12 ALLOPL4/0/1/12 Clear (In use)
      13 ALLOPL4/0/1/13 Clear (In use)
      14 ALLOPL4/0/1/14 Clear (In use)
      15 ALLOPL4/0/1/15 Clear (In use)
      16 ALLOPL4/0/1/16 HDLCFCS (In use)
      17 ALLOPL4/0/1/17 Clear (In use)
      18 ALLOPL4/0/1/18 Clear (In use)
      19 ALLOPL4/0/1/19 Clear (In use)
      20 ALLOPL4/0/1/20 Clear (In use)
      21 ALLOPL4/0/1/21 Clear (In use)
      22 ALLOPL4/0/1/22 Clear (In use)
      23 ALLOPL4/0/1/23 Clear (In use)
      24 ALLOPL4/0/1/24 Clear (In use)
      25 ALLOPL4/0/1/25 Clear (In use)
      26 ALLOPL4/0/1/26 Clear (In use)
      27 ALLOPL4/0/1/27 Clear (In use)
      28 ALLOPL4/0/1/28 Clear (In use)
      29 ALLOPL4/0/1/29 Clear (In use)
      30 ALLOPL4/0/1/30 Clear (In use)

asterisk-server*CLI> pri show spans
PRI span 1/0: Down, Active

[email protected]:~# asterisk -rx “dahdi show status”
Description Alarms IRQ bpviol CRC Fra Codi Options LBO
T4XXP (PCI) Card 0 Span 1 OK 0 0 501121 CCS HDB3 CRC4 0 db (CSU)/0-133 feet (DSX-1)
[email protected]:~#

Attached are the DAHDI config files.

Please review and advise what am I missing here as the PRI line works well when connected thru service provider’s Schmid modem.

Thank you.

try:
span=1,1 in system file.

Thanks James.

I already tried that and got same result. i also tried different combinations with and without CRC4 etc. But no luck.