Info-3b2 Digest, Number 14

[Info-3b2 Mailing List]

                           Info-3b2 Digest, Number 14
 
                         Thursday, September 15th 1988
 
Today's Topics:
 
                          Re: Parts is Part(third try)
                                      3B20
                                    Re:  3B20
----------------------------------------------------------------------
 
Subject: Re: Parts is Part(third try)
From: netsys!att!cbzeus!doc

>	On another note, the question about 3b5, 3b15's and 3b20's.
>
>	the 3b5 is a mini, unlike the "desktop" 3b2 line, these are
>	"floor" models, the 3b15 is a super-duper 3b5, with all the 
>	options on it, it's like or better a vax 11/780. the 3b20 is
>	used with 5ESS Digital switch, I don't think it's used for anything
>	else, but I'm sure it could be.
>
>	maybe 3b2fst!randy (now ocrjd!randy) could fill us in on the
>	particulars if you specfiy them
>
>	dewey coffman
>	austin, texas 

True, the 3B20 is used with the 5ESS switch (multiple 3B20's depending
on the configuration).  It is also used in MANY, many other applications.

The 3B20 is designed to meet the needs of both the high-end minicomputer
and low-end main frame computer users.  It comes in a variety of
configurations, based upon the 3B20S (simplex) and the 3B20D (duplex).

				D.O. Chambers
				AT&T Network Systems

------------------------------
 
Subject: 3B20
Date: 14 Sep 88 13:51:31 EDT (Wed)
From: grs at alobar.ATT.COM (Gregg Siegfried)

Hi there.  

Although this is the 3B2 group, I thought I would comment on something
Dewey wrote recently about 3B20s.. 

The 3B20 is indeed used in the 5ESS.  Indeed, it is used broadly within
the AT&T network.  This is the duplex model though.  The 3B20 Simplex
is a general purpose Unix machine, and is in wide use as such within
AT&T, and I believe, many RBOCs.  It is a 1 MIP, roughly, machine, and
is similar in size, and power, to a VAX 11/780.  It is wildly different
than the 3B15 or 3B2 machines, as they are today, as it seems to have
been designed for workhorse telco applications rather than for the 
computer market..(sysadm menus?  We don't need no steenking sysadm menus :-)

As a general purpose 1 mip Unix machine, I prefer it to the 3B15.

I just didn't want people to think it was nothing but a 5ESS (which is
impressive enough, now that I think about it.. )

Have a good one..

Gregg Siegfried
Software Engineer
AT&T OSS Development 

------------------------------
 
Subject: Re:  3B20
From: netsys!vsi!friedl

> The 3B20 is indeed used in the 5ESS.  Indeed, it is used broadly within
> the AT&T network.  This is the duplex model though.

It is my understanding that the 3B20 is done with bit-slice (AMD 2900?)
and it not entirely compatible with the other 3B machines.  The Duplex
model (3B20D) is a dual-everything model that is supposed to never go down.
Somebody told me that there are machines are around that have had under
a half an hour of downtime in >5 years of operation.  Very impressive if
you need this kind of thing and have the $ to pay for it.  Anybody else
know more?

     Steve

--- 
Steve Friedl    V-Systems, Inc.  +1 714 545 6442    3B2-kind-of-guy
friedl at vsi.com     {backbones}!vsi.com!friedl    attmail!vsi!friedl
------------Nancy Reagan on conductance: "Just say mho"------------

 
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