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AST RESEARCH, INC. TECHNICAL BULLETIN #TB-0351 12-28-87
UDS SYNCHRONOUS MODEM/INTERNAL CONFIGURATION
Universal Data Systems (UDS) synchronous modems are widely used
with AST data communications products that require a
synchronous modem. This includes all products based around the
AST CC-432 board, such as the 5251/12, SNA, BSC, 3770, and 3780
packages. The following information was obtained from UDS for
their 208A/B modems, but the general principles apply to all
UDS synchronous modems.
208A/B modems - important settings for dial-up use:
-jumper marked 2w/4w should be set to 2w (2 wire use)
-jumper marked 50ms/150ms should be set to 150ms (CTS
delay)
-jumper marked 8.5 ms/50 ms should be set to 50ms (CD
delay)
-jumper marked RTS - CXRON/DTE should be set to DTE (RTS
controlled by terminal rather than forced on
continuously).
Additionally, UDS modems are Bell compatible, not
CCITT V.series compatible.