need help with leased lines

[Shankar Bhattacharyya]

I need some help with communications over leased lines.

There is a four wire leased line, with a terminal at one end, and a 386
machine running SCO Xenix (3.2) at the other. At each end there is an
AMT Star modem, which is claimed to be compatible with a Hayes 2400.
The line will be used exclusively for the incoming connection.

Communications, of course, don't work, because the modems do not support
four-wire lines directly. They can be made to work with two wire leased
lines, according to the manufacturer.

The connections between terminal and modem at one end, and computer and
modem at the other are apparently OK. One can connect to the modem using
cu, addressing it as a direct line, so it is possible to set things in
non-volatile memory, and then get out.

I would appreciate pointers to information on getting this to work. I know
almost nothing about leased lines. I gather they need something called a
hybrid at each end, and these should be in place today.

There are no manuals on anything except the modems, and those have not yet
enabled me to figure out what I need to do. Neither the vendor nor the
owner found it useful to keep the Xenix manuals, but I have access to
standard Unix manuals. I believe I can sort out the Unix issues anyway.

Once the leased line issues are straightened out, is there some way to
ensure that the modem at the computer end can be set to establish the link
without hassles, given complete Unix incompetence at their site?

Is the leased line issue completely separate from any Unix matters? How do
I go about making this work? I would appreciate any help I can get.

Thanks for any advice, including pointers to documentation.

- Shankar

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Shankar Bhattacharyya, Information Systems, New York University
sbhattac at sales.stern.nyu.edu
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