Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!lll-winken!telecom-request From: richarbm@mentor.cc.purdue.edu (Bryan Richardson) Newsgroups: comp.dcom.telecom Subject: Re: Questions About New Service Being Installed Message-ID: Date: 26 Mar 91 05:03:49 GMT Sender: Telecom@eecs.nwu.edu Reply-To: Bryan Richardson Organization: Purdue University Lines: 21 Approved: Telecom@eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu X-Telecom-Digest: Volume 11, Issue 242, Message 2 of 9 In article rees@citi.umich.edu (Jim Rees) writes: X-Telecom-Digest: Volume 11, Issue 240, Message 4 of 11 > What I'd like to know is what are 2 and 3ESS? What's the difference > between a 1 and a 1A (is it just the processor? Does 1A run Unix?) > And what kind of hardware does a 4ESS have (I've never seen one)? I can't address 2 and 3ESS, but as a part of the 4 ESS software development organization, I can address the last question. The 4 ESS currently uses the same processor (the 1A) as the 1A ESS switch, but the 4E uses a digital switching fabric while the 1A is analog. In a live office, the 4E sounds similar to a 5E -- very little actual noise -- although it looks rather different (there are no doors on most of the frames). Bryan Richardson richarbm@mentor.cc.purdue.edu AT&T Bell Laboratories and, for 1991, Purdue University Disclaimer: Neither AT&T nor Purdue are responsible for my opinions.