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From: bob@semantic.UUCP
Newsgroups: comp.dcom.modems
Subject: Telebit setup: T2500 on lease line
Message-ID: <9008111751.AA00798@uunet.uu.net>
Date: 10 Aug 90 15:24:12 GMT
Sender: usenet@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 73

Ken McVay writes:

> I've been banging my head against the wall here, trying to make two T2500's
> behave themselves. The modems are on each end of a leased phone line.

> I'm unfamiliar with the differences in operation when using leased lines 
> instead of dialup, and would appreciate some pointers, particularly
> concerning flow control. 

> The systems are running SCO Xenix 2.3.2, and both are using Wyse smart port
> cards 

Well I'm not familiar with leased lines but I am familiar with T2500s,
SCO Xenix 2.3.2 and smart cards.

Since your running Xenix I assune you are using some kind of 386 or 486 PC 
clone.  Probably a Wyse?  These usually come configured with a stand 
PC RS232-C serial port. Every good clone should.  My first suggestion is to 
try running your modems off of these serial ports rather than the smart ports.
This will eliminate a whole level of guessing and flow control!  UUCP uses 
XON/XOFF characters in its protocol and the modem uses it for flow control;
this creates a conflict.  However the TBITs know this and work with it. But
your smart card is sitting there in the middle!  And it can't figure out
what the heck is going on.  So first off; Get off the stupid smart card
for a while until you get everything else worked out.

I am also currently running SCO Xenix 2.3.2, with a T2500 on my (dumb) 
serial card and the default (XON/XOFF) flow control works fine. 
(Except when doing UUCP with slow modems; but that's a different story)

> I'm unfamiliar with the differences in operation when using leased lines 

Now this sounds like there would be a few basic registars to set and I bet
Telebit Tech Support could tell you what they are.

However here is my standard dialup configuration (For T2000s & T2500s):
(The ones with stars(*) I think are applicable)

* &f	 Reset Modem
* e0	 Echo off; Don't need a getty on our case.
* q6	 Be quiet, unless your asked
  x14	 Notice when the line is in use
  38=20	 Standard delay before disconnect
* 45=255 Enable remote access
* 48=1	 Use eight bit comparison
* 51=5	 19200 baud Interface speed
  52=2	 Reset on disconnect
* 54=3	 Standard break interpertation
  61=25	 Low speaker volume
* 66=1	 Lock interface speed
  92=1	 PEP tones last
* 110=1	 Enable data compression
* 111=30 Use UUCP protocol
* 131=1	 Data carrier detect when data carrier detected
* &w	 Save in NVRAM

A few notes on your current configuration:

S07=255  (The default of 40 should be sufficient, See S101 description)
S41=002  (This is a leased line, why bother with an inactivity timer?)
S50=255  (Correct)
S51=005  (Correct)
S55=003  (Worried about +++ in the data stream?)
S101=001 (The other is set to 2, right?)
S105=000 (I don't understand the purpose of this)
S110=001 (Correct)
S111=030 (Correct)
S255=000 (This is the default)

-- Good Luck!

-- Robert A. Gorman (Bob)        bob@rsi.com           Watertown MA US --
-- Relational Semantics, Inc.    uunet!semantic!bob    +1 617 926 0979 --