🚀 go-pugleaf

We are having problems getting two of our routers to speak to each other via
RS-449 interfaces through fiber optic modems.  The first router is an AGS+
running 8.3(3) with (4) MCI cards of varying revision (we're using the board
with v1.7 microcode).  The second router is an IGS running 9.0(1).  Both
routers have DTE appliques.

The modems are Optical Data Systems ODS219 with DCE interfaces and set for a
data rate of 64 kbps.  The modem path has been thoroughly checked out with a
data analyzer, running both local and remote loopbacks from both ends.

When the routers are connected back-to-back with a Black Box modem eliminator,
the link comes up and operates fine.  When the fiber optic modems are
connected, the links stay down, however the control lines from the router do
talk to the modem (e.g. when the router interface is set to loopback, the local
modem automatically switches to local loopback mode).  We've tried various
switch combinations of master and slave clocking on the modems with no success.

Any ideas would be appreciated.  Thanks,

Jerry
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Jerry Bass                                              gbass@mitre.org
The MITRE Corporation                           Bedford, MA
617-271-7219