Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!torsqnt!tmsoft!nebulus!root
From: root@nebulus (Dennis S. Breckenridge)
Newsgroups: tor.general
Subject: Modems
Message-ID: <1989Nov9.140538.13086@nebulus>
Date: 9 Nov 89 14:05:38 GMT
Distribution: tor
Organization: Alchemy Mindworks, Toronto, Ontario, Canada
Lines: 41

To all downstream sites of nebulus and any others that may be interested:

In the past month or so nebulus has undergone many changes but the most
dramatic of all was the addition of a new Telebit TB-2500. This is against
the grain of what I am doing here but I had no option but to add a TB2500
in place of the reliable Microcom 9624C. I have uncovered two major bugs
with the modem already (its ok thou, the TB1000 has the same two bugs).

Bug #1 - When using hardware flow control, the modem will send anywhere 
	 from 4 to 8 characters after RTS is pulled low. This effect is 
	 the input buffer on you tty gets blown and uucico times out. 
	 Backing the baud rate down to 9600 reduces the frequency of this
	 problem. You 3B2 folks know this as skidding on eports.

Bug #2 - When using hardware flow control, the remote modem stops the 
	 transmission by pulling it's RTS low. This in turn pulls the
	 local modem's CTS low. Under several occasions the modem will
	 never "hear" the remote end lift RTS and it will hold it's own
	 CTS low until the modem is manually reset. I have solved this one
	 in a bizzare way. The power to the modem is plugged into a BSR
	 remote control "Appliance" controller. Nebulus has an interface
	 from serial to BSR so I issue a powerdown command to the modem
	 from another TTY. 

  I have informed Telebit about both of these problems and they did 
acknowledge that they are aware of them.
  Now to the matter at hand. The modem phone numbers for nebulus are:

	   (416) 733-1609 - Microcom 9624C - Bidirectional
	   (416) 733-1630 - Telebit TB2500 - Bidirectional
	   (416) 733-1696 - Microcom 9624C - OUTGOING only (voice line)

 Could the person or persons unknown that are polling my voice line 
 cease and decist! I am getting tired of talking to the phantom!

-- 
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NAME:     Dennis S. Breckenridge   UUCP: uunet!tmsoft!nebulus!dennis
QTH:      Toronto, Canada          ELECTROMAGNETIC:  145.03Mhz ve3gss@ve3gss
AMPR.ORG: [44.135.88.54]           THE RIGHT CHIOCE: (416) 733-1696
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