Path: utzoo!news-server.csri.toronto.edu!rutgers!uwm.edu!spool.mu.edu!samsung!zaphod.mps.ohio-state.edu!rpi!masscomp!peora!tarpit!bilver!bill
From: bill@bilver.uucp (Bill Vermillion)
Newsgroups: comp.dcom.modems
Subject: Re: Why do they insist on power cubes???
Message-ID: <1991Mar4.023716.3213@bilver.uucp>
Date: 4 Mar 91 02:37:16 GMT
References: <191@raysnec.UUCP> <14@mich-ns.UUCP> <26284@netcom.COM>
Distribution: usa
Organization: W. J. Vermillion - Winter Park, FL
Lines: 32

In article <26284@netcom.COM> james@netcom.COM (James Paul) writes:

>In article <14@mich-ns.UUCP> tech@.UUCP (Mich. Network Sys. TECH SUPPORT) writes:

>>The Telebit power supplies are made by a separate company. Yes, I agree
>>that they should have some sort of device with ONE of these "bricks"
>>and a "power strip" into which you can plug, say, 8 or 10 modems.

>Or, you could simply use another power supply. These "power cubes" are
>more commonly known as wall transformers or AC adapters. They usually
>consist of a single step-down transformer in the 9 to 12 volt range.
>Some rectify the AC to DC, filtering with a single capacitor.

T'bit's ouputs are 18 vac with a 25va rating.  Not quite the same as some
of the "el cheapo" modem power supplies - and they even used grounded
plugs!


>If you have 10 0.2amp modems that run on 12vdc for example, just wire
>up a harness with 10 connectors and run the modems off any supply. You
>can get power supplies in that range rated at 5 amps or more for $10.
>(Or a few $ more at Radio Shack :-) Also, you can pay a few more $ to
>get a good regulated supply.

But be sure you put protection on each individual modem connection.
All you need is a catastrophic power supply failure and you have 10
dead modems.


-- 
Bill Vermillion - UUCP: uunet!tarpit!bilver!bill
                      : bill@bilver.UUCP