🚀 go-pugleaf

I have an ASM-32 that I am trying to get a "FaxModem" made by ZOOM
Telephonics, Inc. to work on.  I can't seem to establish a connection
above 9600-baud.  I would appreciate any help readers of this group
could give.  I'm not trying to do FAX transfers, just ordinary data
connections.

The serial line of the ASM the modem is on is setup as follows.
#
#  Fast modem.
#
line 40
access-class 1 out
no private
exec-timeout 2
session-timeout 45
modem ri-is-cd
flowcontrol hardware
autobaud
databits 8
parity none
stopbits 1
length 24
width 80
terminal-type dialup
location TCC 2B - 14400-baud (MNP) dialup.


I have wired the serial connection as shown below.
	ASM-32		Modem
	---------------------
	SG (7)		SG (7)
	TD (2)		RD (2)
	RD (3)		TD (3)
	RI (22)		CD (8)
	DTR (20)	DTR (20)
	CTS (5)		CTS (5)

The modem has the following settings (other than the factory defaults):
&C1	Have CD follow condition of modem carrier.
&D3	Reset modem after DTR drops.
S0=1	Set for auto-answer.
S36=5	Attempt an MNP connection, if it fails attempt an asynchronous
	(direct mode -- don't buffer data) connection.
These settings were saved as configuration zero.

I have been able to establish connections to the ASM at:
	2400-baud, using a 2400-baud modem (Practical Peripherals PM2400SA),
	4800-baud, using a Prometheus ProModem 9600-EC,
	9600-baud, using a Prometheus ProModem 9600-EC.
Once at the ASM prompt things work as they should.

I can't establish a connection to the ASM at 19200-baud, nor at
38400-baud.  From looking at the ASM port (using sh li 40) at various
times during the connection attempt it appears the ASM is in its
autobauding mode.  It can't seem to lock on to the right speed.
Occasionally it will show that the line has received a BREAK.

I have tried setting the ASM line to a speed of 38400 instead of
autobauding but that didn't help any with the attempt to connect at
38400.  (I didn't try a slower speed connection with the ASM port at
38400 since the 38400 connection didn't work).

I'm not sure if the error correction, or compression, at the higher
speeds might be messing things up since I've never worked with these
features before.  It seems that that shouldn't be a problem in just
getting to the terminal server prompt though.

Well that's as far as I've gotten with it.  I'm pretty well stuck right
now.  If you need more information please ask (I know I do!).

Thank you,
Ray Piworunas (ray@nmt.edu).