Path: utzoo!utgpu!water!watmath!clyde!cbosgd!mandrill!neoucom!wtm
From: wtm@neoucom.UUCP (Bill Mayhew)
Newsgroups: comp.dcom.modems
Subject: Re: Telebit -- thanks
Summary: Trailblazer != Courier HST
Message-ID: <1004@neoucom.UUCP>
Date: 12 Feb 88 04:04:06 GMT
References: <626@ddsw1.UUCP> <4560002@hpihoah.HP.COM>
Organization: Northeastern Ohio Universities College of Medicine
Lines: 43


It is true that both the Telebit Trailblazer and the Courier HST
provide up 19.2K bps host interfaces.  What sets the Trailblazer
apart from the Courier HST is that the Trailblazer is able to
rcognize the uucp "g" protocol.  As such, the Trailblazer is able
to locally generate the packet ACKs, and thus the need for a
reverse channel is eliminated.  The trellis coding used in the
Trailblazer is also different, in that the fallback on poor lines
is incremental in much smaller bps steps than the HST.

Over the next few weeks, I plan to wring-out both the Telebit
Trailblazer and the HST.  In fact, the I have the following modems
on the desk next to me:

AT&T 2224 CEO		2400 bps / MNP 2:1 data compression
AT&T Dataphone II 2296 	2-wire 9600 BPS V.32
Microcom AX/9624c	2400 bps / high speed
Racal Vadic 9600-VP	2400 bps / high speed
Telebit Trailblazer +	2400 bps / high speed
UDS model v.32		2-wire 9600 BPS V.32
US Robotics Courier HST	2400 bps / high speed

If I find out anything interesting in this modem war, I'll post the
results.  My early impression is that the Telebit is the way to go
because it integrates so nicely with uucp.  If you are using a long
block protocal such as hyperaccess, the other highspeed modems
ought to be very serious competition, and then you can shop for
price.  Visual inspection reveals that the quality of construciton
is ranked as follows:

1.  Trailblazer
2.  AT&T 2224 CEO
3.  UDS v.32
4.  Microcom AX/9624c
5.  Courier HST
6.  Racal 9600VP
7.  AT&T Dataphone II  (this appears to be a prototype.  It is
			a very low serial number.)


The Racal and Dataphone II had quite a few jumper wires that seemed
to be fixes for last minute changes.
		-Bill