PPP on a bare private line pair (newbie question)

[Ivan Vicente Janvrot Miranda]

Hi,

I'm running a ppp link between an office Linux box (24 H/day up) and my
home Linux box (on only when I'm working at home).

The line is a bare several Km no 48V private pair with an USR Sportster
ISA 33600 each side. The link is operating ok at full speed, and the
routing is ok. I use no authentication. 

The question is how to start the link each time the home machine is
turned on and the line is eventually broken (I forced it for tests
purposes).

I'm using the following scripts in system init:
At office:
#!/bin/sh
exec /usr/sbin/pppd /dev/ttyS0 38400 lock debug modem crtscts \
      connect "chat '' ATZ OK ATM0 OK ATA CONNECT" persist \
      ms-dns 10.10.10.100 10.10.20.1:10.10.20.2

At home:
#!/bin/sh
exec /usr/sbin/pppd /dev/ttyS0 38400 lock debug modem crtscts \
      connect "chat '' ATZ OK ATX3D CONNECT" persist 

/etc/ppp/options and /etc/ppp/options.ttySx are empty in both machines.
Routing is managed with ip-up / ip-down scripts.

The problem is twofold:
1) The ATA and persist operate eletromecanichal parts is the modem too
often (hook relay)
2) Synchronization after a line open/close circuit is difficult or does
not happen.

I'm already successfully using mgetty in both machines for dial-in
connections, but with extra USR modems, over switched lines, with
authentication and adequate routing. The point is that in the private
line case there is no 48V so the modems do not operate as in regular
switched phone lines.

I don't know much about modems and ppp, but I suppose this is an usual
configuration, so where is the trick?

Thanks in advance for any clue. 
-- 
Janvrot IVM
[EMAIL PROTECTED]

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