[Asterisk-Dev] E1, crc-4 errors

[Konrad Gorski]

Nearly 100% of errors (99,999%) at any time, regardless of activity on
line. Please see attached log from Telco operator. In
/var/log/asterisk/messages it report no alarms, but by any PRI
connection:

May 13 15:29:03 WARNING[12301]: File chan_zap.c, Line 5314
(zt_pri_error): PRI: Read on 67 failed: Unknown error 500;

This kind of WARNING was few times reported on mailing list - w/o
answers/explanations (?).

E1 line w/o alarms, E100P LED green, zttool: No alarms, IRQ Misses:0, ..
Make it sense experiment with switchtype?
Till now switchtype=euroisdn.
Telco use Lucent 5ESS, so I will try switchtype=5ess. 

Konrad


-----Original Message-----
From: asterisk-dev-admin at lists.digium.com
[mailto:asterisk-dev-admin at lists.digium.com] On Behalf Of Mark Spencer
Sent: Monday, May 12, 2003 3:21 PM
To: asterisk-dev at lists.digium.com
Subject: RE: [Asterisk-Dev] E1, crc-4 errors

> Load < 3%. IRQ - OK. E1 line and cabling - OK: Asterisk on this line
> works well as my office PBX. CRC errors are on Telco side only. I've
> tested E1 line with another PBX (TELRAD) - 0% CRC errors on Telco
> side.

CRC4 calculations are made within the framer itself.  How many errors do
you get?  Do they show up at particular time intervals?  In your
/var/log/asterisk/messages does it report the line going into alarm?

Mark

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