pri_dchannel: PRI got event: HDLC Bad FCS ( on Primary D-channel of span 1

11.5.3.7. pri_dchannel: PRI got event: HDLC Bad FCS ( on Primary D-channel of span 1

1. Problem Description:

If you sometimes see this error on a zaptel card, this might be caused by a network card or a harddisk taking an interrupt for too long. This will cause the calls to be dropped.

This might be caused by:

- Too much I/O activity
- bad hardware
- bad drivers

If you see this error non stop scrolling on the asterisk CLI, you probably made a configuration error,

Doublecheck your coding / framing specified in zaptel.conf.
The below settings worked.

2. Possible solutions:

- If you are using an intel 100mbit network card, try replacing the standard drivers with the drivers from the intel website. The drivers included in the kernel have some latency problems

- replace on board nics with some add-in cards

- Try looking if you have any shared interrupts, and try playing with disabling onboard network cards and plugging in new ones.
See also here

- Try replacing SATA controllers with IDE controllers and tweak the hdparm settings. see this tutorial

- Stop using the harddisk on the server as much. (get rid of updatedb lines in the cron jobs).

- upgrade to a dual cpu system, more cpu's = an extra cpu to take an interrupt if the first one is busy with an interrupt that is waiting too long.

- If you are using a dual port or quad port PRI digium card, you could try to do the hdlc in hardware instead of in software.

- enable ACPI in the kernel config

- enable your chipset in the kernel config

If this article helped please let us know what the solution was to your problem. (And if it didnt help but you found another solution, llet us know too!!).

references:

PRI tutorial on asteriskguru
hdlc abort theory
hdlc theory
some more hdlc info
eepro vs eepro100 vs e100 driver

related threads on the mailinglists:

problem description on mailinglists
problem solution on mailinglist
related thread on mailinglists
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User Comments

antonis (apsaras at microbase dot gr)
13 February 2006 14:50:08
"If you are using a dual port or quad port PRI digium card, you could try to do the hdlc in hardware instead of in software"

Is there any tutorial for that?

thnx

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