Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!ucsd!casbah.acns.nwu.edu!accuvax.nwu.edu!nucsrl!telecom-request
From: rcj1@ihlpf.att.com (Raymond C Jender)
Newsgroups: comp.dcom.telecom
Subject: Re: Switching Office Open House
Message-ID: <15303@accuvax.nwu.edu>
Date: 7 Dec 90 17:09:22 GMT
Sender: news@accuvax.nwu.edu
Organization: AT&T Bell Laboratories
Lines: 22
Approved: Telecom@eecs.nwu.edu
X-Submissions-To: telecom@eecs.nwu.edu
X-Administrivia-To: telecom-request@eecs.nwu.edu
X-Telecom-Digest: Volume 10, Issue 872, Message 1 of 13


In article <15250@accuvax.nwu.edu>, rees@pisa.ifs.umich.edu (Jim Rees)
writes:

> As a computer guy, one thing intrigued me.  Can anyone tell me about
> the "1ESS memory card" that is just a piece of aluminum the size of a
> sheet of notebook paper?  It doesn't seem to have any electrical
> contacts, but you can see little squares on it that might be
> individual bits of magnetic memory.

> After nearly ten years of reading TELECOM Digest I finally got to see
> what some of this stuff looks like.


The 1E Memory Card is 6 5/8 x 11 1/4 inches.  Each card stores 64
words of 44 Bits. A 45th bit in each word is not used for data
storage.  When a memory card is placed in the module, there are 64
solenoid loops associated with it, one for each row of 45 bar magnets.
A pulse in a solenoid loop interrogates simultaneously the
corresponding row of 45 magnets on the card.

Clear thing up a little?