[asterisk-users] D-channel errors and Channelbanks

Mon Dec 15 11:16:13 CST 2008

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I've been seeing some strange issues recently as it relates to our
Asterisk phone system. Let me give a little background on things:

We have a T1 provided by Knology. We recently had an outage of Internet
and phones. The following problems (except for the log messages) seemed
to have cropped up after the outage. I was prompted by a friend of mine
to power cycle all the equipment detailed below (not sure if that's
relevant.)

T1 > Ditech Echo Canceler > Asterisk server asterisk1 > Zhone Z-plex 10
Fax channel bank > fax devices

T1 > Ditech Echo Canceler > Zhone Z-plex 10 Voice channel bank > voice
devices.

Now, let me explain the symptoms of the problem.
 * We have a Pitney Bowes Postage meter attached to the fax channel
bank. It is not able to retrieve postage. It received a dial-tone, and
attempts to dial. It does not connect.
 * A regular phone connected to the voice channel bank receives a dial
tone, but no number tones are recognized. (when you attempt to dial a
number, the dial tone stays constant)
 * A fax machine attached to the fax channel bank has problems sending
and receiving faxes. These problems are intermittent. It is not related
to the fax machine itself because the machine has been replaced with a
new device.
 * Various errors in /var/log/asterisk/messages, as detailed below.

Dec 15 03:38:11 NOTICE[5077] chan_zap.c: PRI got event: HDLC Bad FCS (8)
on Primary D-channel of span 1
Dec 15 07:44:06 NOTICE[5077] chan_zap.c: PRI got event: HDLC Bad FCS (8)
on Primary D-channel of span 1
Dec 15 08:21:41 NOTICE[5077] chan_zap.c: PRI got event: HDLC Bad FCS (8)
on Primary D-channel of span 1
Dec 15 10:37:18 NOTICE[5077] chan_zap.c: PRI got event: HDLC Bad FCS (8)
on Primary D-channel of span 1

There is a much longer history of these errors attached to this email,
and the attachment includes a wider variety of messages. The file is the
result of grep -i d-channel on an archive of asterisk message logs.

# cat /etc/zaptel.conf

span=1,1,0,esf,b8zs
bchan=1-23
dchan=24

span=2,0,0,esf,b8zs
bchan=25-47
dchan=48

span=3,0,0,esf,b8zs
fxoks=49-72

span=4,0,0,esf,b8zs
fxoks=73-96

loadzone = us
defaultzone = us

# cat /proc/interrupts
           CPU0       CPU1
  0:  245968510  245928679    IO-APIC-edge  timer
  1:        157        142    IO-APIC-edge  i8042
  8:          1          0    IO-APIC-edge  rtc
  9:          0          0   IO-APIC-level  acpi
 11:          0          0   IO-APIC-level  ohci_hcd
 12:         62          4    IO-APIC-edge  i8042
 14:    2207197    2216054    IO-APIC-edge  ide2
177:        187    5788465   IO-APIC-level  eth0
185:   37433273          0   IO-APIC-level  eth1
193:    1124669    1127450   IO-APIC-level  ide0, ide1
201:  245939300  245915557   IO-APIC-level  wct4xxp
NMI:          0          0
LOC:  491977277  491977276
ERR:         24
MIS:          0

# lspci
00:00.0 Host bridge: Broadcom GCNB-LE Host Bridge (rev 32)
00:00.1 Host bridge: Broadcom GCNB-LE Host Bridge
00:03.0 Ethernet controller: Intel Corporation 82546EB Gigabit Ethernet
Controller (Copper) (rev 01)
00:03.1 Ethernet controller: Intel Corporation 82546EB Gigabit Ethernet
Controller (Copper) (rev 01)
00:04.0 VGA compatible controller: ATI Technologies Inc Rage XL (rev 27)
00:05.0 IDE interface: Silicon Image, Inc. PCI0680 Ultra ATA-133 Host
Controller (rev 02)
00:0f.0 Host bridge: Broadcom CSB6 South Bridge (rev a0)
00:0f.1 IDE interface: Broadcom CSB6 RAID/IDE Controller (rev a0)
00:0f.2 USB Controller: Broadcom CSB6 OHCI USB Controller (rev 05)
00:0f.3 ISA bridge: Broadcom GCLE-2 Host Bridge
00:10.0 Host bridge: Broadcom CIOB-E I/O Bridge with Gigabit Ethernet
(rev 12)
00:10.2 Host bridge: Broadcom CIOB-E I/O Bridge with Gigabit Ethernet
(rev 12)
01:03.0 Communication controller: Xilinx Corporation Wildcard
TE405P/TE410P (1st Gen) (rev 01)

I've searched the mailing lists on these topics, and most messages say
the d-channel errors relate to IRQ problems on the server. I'm not sure
how to go about solving this issue.

I'm also not sure if the d-channel problems are related to the channel
bank problems we are having.

I'm new to asterisk as a whole, and I've inherited this system sans
documentation. Any assistance would be greatly appreciated. Please let
me know if there is any additional information you might need.

- --
Regards,

Justin Phelps
IT Director
Eye Center of North Florida
850.522.7952 - Office
850.522.9829 - Fax
850.832.0249 - Cell
www.eyecarenow.com
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