asterisk users - Jun 2004 - Mystery PRI NOTICEs & WARNINGs

Since connecting a PRI to a Digium T100P, I have been seeing the
following messages in syslog every few minutes:

Jun  4 06:51:54 pbx asterisk[13435]: WARNING[1209214400]: chan_zap.c:6176 in
zt_pri_error: PRI: Read on 56 failed: Unknown error 500
Jun  4 06:51:54 pbx asterisk[13435]: NOTICE[1209214400]: chan_zap.c:6913 in
pri_dchannel: PRI got event: 8 on span 1

Sometimes, these messages come out as often as six minutes apart, and
sometimes as infrequently as every hour.  I haven't noticed any
PRI-related problems coincidental with the messages. I am experiencing a
large number of dropped calls, but the dropped calls occur both on PRI and
non-PRI calls.

Has anyone observed these messages, and if so, do you know what they mean
and are they something to be concerned about?

Thanks in advance.

Bruce Komito
High Sierra Networks, Inc.
www.servers-r-us.com
(775) 236-5815

I'm pretty sure the Error 500 can be ignored.  If memory serves, I think it
is related to a transmitter "underrun" error on the T100P framer chip.
This
would occur if the processor doesn't quite keep up with the transmit data
stream on the T1 - ie: is load related.

These occur on all of my systems- I've found that they are generally, but
not always, acommpanied by frame transmission retries (errors appear in
/var/log/asterisk/messages)

I think error 500's can safely be ignored, unless they occur in large
quantities, in which case I've found them to be definitely related to
dropped calls.

Not sure about the event 8's, perhaps they are load related too.

Cheers
Scott


Scott M. Stingel
President,
Emerging Voice Technology, Inc.
Palo Alto California & London England
www.evtmedia.com 

-----Original Message-----
From: asterisk-users-admin@lists.digium.com
[mailto:asterisk-users-admin@lists.digium.com] On Behalf Of Bruce Komito
Sent: Friday, June 04, 2004 7:07 AM
To: asterisk-users@lists.digium.com
Subject: [Asterisk-Users] Mystery PRI NOTICEs & WARNINGs

Since connecting a PRI to a Digium T100P, I have been seeing the following
messages in syslog every few minutes:

Jun  4 06:51:54 pbx asterisk[13435]: WARNING[1209214400]: chan_zap.c:6176 in
zt_pri_error: PRI: Read on 56 failed: Unknown error 500 Jun  4 06:51:54 pbx
asterisk[13435]: NOTICE[1209214400]: chan_zap.c:6913 in pri_dchannel: PRI
got event: 8 on span 1

Sometimes, these messages come out as often as six minutes apart, and
sometimes as infrequently as every hour.  I haven't noticed any PRI-related
problems coincidental with the messages. I am experiencing a large number of
dropped calls, but the dropped calls occur both on PRI and non-PRI calls.

Has anyone observed these messages, and if so, do you know what they mean
and are they something to be concerned about?

Thanks in advance.

Bruce Komito
High Sierra Networks, Inc.
www.servers-r-us.com
(775) 236-5815



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On Fri, 2004-06-04 at 09:07, Bruce Komito wrote:
> Since connecting a PRI to a Digium T100P, I have been seeing the
> following messages in syslog every few minutes:
> 
> Jun  4 06:51:54 pbx asterisk[13435]: WARNING[1209214400]: chan_zap.c:6176
in zt_pri_error: PRI: Read on 56 failed: Unknown error 500
> Jun  4 06:51:54 pbx asterisk[13435]: NOTICE[1209214400]: chan_zap.c:6913 in
pri_dchannel: PRI got event: 8 on span 1
The new Zaptel has the "zttest" program, which will tell you if
interrupts are being locked for too long.  This can cause the Error 500
messages you are seeing.  Causes of interrupts being locked for too long
can be: graphics, frame buffer, IDE DMA.  There might be other things
that cause this error, I don't know.

-- 
          Eric Wieling * BTEL Consulting * 504-899-1387 x2111
"In a related story, the IRS has recently ruled that the cost of Windows
upgrades can NOT be deducted as a gambling loss."