Maintenance modems and power failures

Ron Buchalski rbuchals at
Thu Feb 11 15:43:02 UTC 1999

>Date: Wed, 10 Feb 1999 18:38:57 -0800
>From: Austin Schutz <tex at>
>To: nanog at
>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.


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