Xref: utzoo comp.unix.aux:570 comp.dcom.modems:3164
Path: utzoo!attcan!uunet!comdesign!pst
From: pst@comdesign.CDI.COM (Paul Traina)
Newsgroups: comp.unix.aux,comp.dcom.modems
Subject: Re: Telebit Trailblazer + and A/UX
Message-ID: <590@comdesign.CDI.COM>
Date: 6 Jan 89 02:44:35 GMT
References: <150@radar.UUCP>
Organization: Network Equipment Technologies, Santa Barbara, California
Lines: 32

From article <150@radar.UUCP>, by root@radar.UUCP (root):
> Has anyone used a Telebit Trailblazer Plus modem with a Mac II under
> A/UX?  I'm curious about what arrangements were used for flow control,
> how it worked communicating with the Mac at 19.2K, and what kind of
> throughput with uucp communicating with another TB+ was obtained.

I just set one up yesterday.  No flow control (actually, one *could*
use hardware flow control, since standard modem cables for the mac
have input-handshake going to pin 5 (cts) on a DB25, but then you
have no way of detecting carrier).  uucico seems to be configurable
to only 9600 baud.  I made a cursory stab at trying to get it to run
19.2k, but had no immediate success, so I just dropped in in at 9600.

Mac II <-> Sun 3/280 --- about 890 characters/sec (limited because of 9600
baud on the Mac...sigh).

For reference, IBM AT clone, Microport UNIX, 19.2k <-> Sun 3/280
runs on average about 14kbps, with occasional increases to 18k when
sending text (as opposed to compressed news batches).

All in all the TB+ is wonderful, the Mac leaves something to be desired.
I'm upset with apple that they do not provide more handshake lines.
Hardware flow control is the optimal way to deal with a modem, but
the mac only has one output signal (going to DTR) and one input
signal (going to CTS for a standard cable, DCD if you wish carrier
detect).

-- 
work:	pst@condor.cdi.com	{apple,pyramid,ucsbcsl,uunet}!comdesign!pst
play:	pst@ai.ai.mit.edu	{ucsbcsl,comdesign,dscvax2}!nessus!pst
school:	pst@cornu.ucsb.edu	pst@sbitp.bitnet
		"I'm not a scientist, but I play one on TV."