asterisk users - Nov 2011 - FXS - Power Alarms

Greetings-

On occasion, I'm seeing the following in syslog on some systems using analog
cards with FXS modules:

[ 1664.861183] Power alarm on module 1, resetting!

These are typically cleared by restarting asterisk/dahdi, or power cycling the
system. However, I'm wondering if anyone can explain what condition exactly
causes this. My best guesses:

-Too high current draw on port (shorted pair)
-Not enough current supplying card/module (bad power supply)
-Voltage introduced to FXS port (FXS port connected to FXO or POTS line for
example)

Thanks!

--Tim

Could it be a weather or other telco problem?

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Tim Nelson
Sent: Thursday, November 10, 2011 2:45 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: [asterisk-users] FXS - Power Alarms

Greetings-

On occasion, I'm seeing the following in syslog on some systems using analog
cards with FXS modules:

[ 1664.861183] Power alarm on module 1, resetting!

These are typically cleared by restarting asterisk/dahdi, or power cycling
the system. However, I'm wondering if anyone can explain what condition
exactly causes this. My best guesses:

-Too high current draw on port (shorted pair) -Not enough current supplying
card/module (bad power supply) -Voltage introduced to FXS port (FXS port
connected to FXO or POTS line for example)

Thanks!

--Tim

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