Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!thunder.mcrcim.mcgill.edu!snorkelwacker.mit.edu!usc!rpi!zaphod.mps.ohio-state.edu!cis.ohio-state.edu!ucbvax!TECHUNIX.TECHNION.AC.IL!devil
From: devil@TECHUNIX.TECHNION.AC.IL (Gil Tene)
Newsgroups: comp.mail.uucp
Subject: Re: Telebit Registers (was Re: UUNET Problems)
Message-ID: <9999@discus.technion.ac.il>
Date: 17 Jun 91 16:35:18 GMT
References: <1CE00001.hv3cvx@tbomb.ice.com> <1034@trac2000.ueci.com>
Sender: daemon@ucbvax.BERKELEY.EDU
Reply-To: devil@techunix.technion.ac.il (Gil Tene)
Organization: Technion, Israel Inst. of Technology
Lines: 43

In article <1034@trac2000.ueci.com> das@trac2000.ueci.com (David Snyder) writes:
>In article <1CE00001.hv3cvx@tbomb.ice.com>, time@ice.com (Tim Endres) writes:
>-> This is definitely wrong. I would be very suspicious of my register
>-> settings. Here are mine (S58 and S111 are important):
>-> .
>-> .
>-> S50=000 S51:254 S52:002 S54=000 S55=000 S56=017 S57=019 S58:000 S59=000
>-> .
>-> .
>-> S110:000 S111:030 S112=001
>-> .
>-> .
>
>Is it really a good idea to turn off ALL flow control?  I have my S58 set to
>"002" for Full RTS/CTS flow control.  If I can speed throughput without data
>loss, please let me know.
>

Well, it doesn't really matter when running a uucp-g protocol, even with
spoofing turned on, since the protocol itself will wait for protocol ACKs
before sending more data, thus avoiding an overrun. You won't get any
faster or slower if you turn hardware handshake on here.

It DOES matter when running the modem for other protocols, such as
streaming protocols (e.g. Zmodem). Then not having hardware handshaking
on may cause data overruns, making the modem unusable for such protocols.
You can see this often when using a Telebit hooked at 19200bps talking
to a 2400bps modem and doing Zmodem. The 19200bps line can push data in
much faster than it goes out, eventually overflowing the buffer since 
there is no protocol or hardware handshake to tell it to stop. The CTS
light on the Telebit will turn off, begging the data to stop, but the 
SD light will stay on solid.

In short, I recommend turning hardware handshake on with S58. It will
not hurt uucp (and will not help), but it will help with non-uucp
dial-in/dial-out connections.

-- Gil.
-- 
--------------------------------------------------------------------
-- Gil Tene			"Some days it just doesn't pay    --
-- devil@techunix.technion.ac.il  to go to sleep in the morning." --
--------------------------------------------------------------------