The ports used must be defined as operating in SDLC mode.
They may be defined with either an external (modem supplied) clock,
or an internal (supplied by the ACC card) clock. With an external
clock, the speed is for documentation purposes only, and will not
be used by the ZCOM system.
The clock multiplier should be x1, and the encoding mode will
normally be NRZ.
A sample Port-Definition is as follows:
Port 01:04 RS232 9600 Ext SDLC x1 NRZ
Refer to the ACC Utilities Reference Guide Section
on ttgen for details.