Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!watmath!clyde!caip!think!nike!ucbcad!ucbvax!decvax!decwrl!johnsson
From: johnsson@decwrl.UUCP
Newsgroups: net.periphs,net.dcom
Subject: Re: 9600 baud modems
Message-ID: <5942@decwrl.DEC.COM>
Date: Tue, 14-Oct-86 01:40:57 EDT
Article-I.D.: decwrl.5942
Posted: Tue Oct 14 01:40:57 1986
Date-Received: Fri, 17-Oct-86 07:42:21 EDT
References: <260@stsci.uucp>
Reply-To: johnsson@decwrl.dec.com (Richard Johnsson)
Organization: Digital Equipment Corporation
Lines: 29
Keywords: UDS
Xref: watmath net.periphs:1239 net.dcom:2165

We have about 25 UDS 9600A/B modems paired with the EC100 error controller.
We've been using them heavily for nearly two years and are reasonably happy.
The two boxes together go for about $2500 quantity one. Since this is a
private error corrected protocol you'll need at least two.

The 9600A/B by itself operates at 9600 baud synchronous half duplex on a
dial line. The EC100 does error correction and retransmission, sync to async
conversion, and half to full duplex simulation. The line turn around can be
set (and used reliably) as low as 30 ms. Unlike some other units we have
tried or heard of, this combination provides quite reasonable interactive
response. I have also used them to run dialup IP connections for both
interactive (telnet) and file transfer (ftp) applications.

The basic unit does not have autodial capability, although if you like to
program such things you can strap it to accept pulse dialing signals on pin
25. Since we were using them for interactive terminals, the lack of autodial
was a small inconvenience compared to the advantage of having 9600 baud
communications.

In summary, I would recommend these units if they otherwise meet your needs
(and your bugdet!). We had no trouble getting a couple units from the local
distributor (whose name I can't recall at the moment) to try out for a week
or two.
-- 
	Richard Johnsson, DEC Western Software Lab, Palo Alto, CA
	UUCP:  {decvax,ucbvax}!decwrl!johnsson
        ARPA:  johnsson@decwrl.dec.com     DEC ENet: rhea::johnsson
	phone: +1 415 853 6676