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From: cej@well.UUCP (Craig Jackson)
Newsgroups: net.dcom
Subject: Re: Call Back Under Berkeley 4.2
Message-ID: <742@well.UUCP>
Date: Sun, 9-Mar-86 13:02:26 EST
Article-I.D.: well.742
Posted: Sun Mar  9 13:02:26 1986
Date-Received: Wed, 12-Mar-86 01:47:56 EST
References: <581@kontron.UUCP>
Reply-To: cej@well.UUCP (Craig Jackson)
Distribution: net
Organization: Whole Earth Lectronic Link, Sausalito CA
Lines: 15

Call-back schemes are fairly common in the mainframe world.  They are used
by banks and other institutions who must be paranoid about security.  They
are generally implemented in dedicated hardware, typically an augmented modem.
This is necessary since many of the devices which one  might  be connected
to, such as protocol converters, have their programs burnt in ROM, or coded
in an obscure datacom-processor assembly language, which is just as bad.

I've never purchased one of these, so I don't know any brand names.  I've
heard talk about one called 'Defender'.

-- 
Craig Jackson
UUCP: {ihnp4!linus,seismo!harvard}!axiom!mhis!dricej
      {dual,ptsfa,lll-crg,hplabs}!well!cej
BIX:  cjackson