Maintenance modems and power failures

Date: Wed, 10 Feb 1999 18:38:57 -0800
From: Austin Schutz <>
Subject: Re: Maintenance modems and power failures

Most network providers are aware of the secret hiding in most of our
POPs. Those little sporters and courier modems stuffed into a rack
somewhere plugged into the nearest available outlet, as the only
out-of-band access. Has anyone come up with a solution for powering
these forgotten pieces of equipment, which doesn't cost more than
the modem itself?

At first you might think it makes sense to power them off the UPS
which is powering the rest of your equipment. The only problem is
if you are using the maintenance modem to monitor your UPS. This
is just one of those things which has bugged me for a few years, but
I still haven't come up with a solution I really like.

Get two modems.

POTS ---- Modem 0 ---- Modem 1
           > >
         UPS AC Utility AC

This only really makes sense if you have your terminal server
w/ redundant power, one utility AC and the other UPS AC.

Don't forget to change the settings on one of the modems so that it
answers on a different number of rings.