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 (Card supplied) clock. With an external clock, the
speed is for documentation purposes only, and is not used by the
ZCOM system.
The clock multiplier should be x1, and the encoding mode may
be NRZ or NRZI.
A sample port definition is as follows:
Port 01:4 9600 Ext SDLC x1 NRZ
Refer to the ACC Utilities Reference Guide Section
on ttgen for more information
on the port definition.
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