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8. EIA RS-232 Cabling
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This chapter shows how to cable the AUDIX RS-232 ports to another AUDIX system using direct cabling
or by cabling through the switch. These ports can be converted to Digital Communications Protocol (DCP)
ports before entering the switch, if desired. This is attractive to System 75, DEFINITY Generic 1, Generic
3, and MERLIN II installations using DCP for interlocation communications since these switches can only
access two of the four DCP ports.
DEDICATED RS-232 CABLING
Figure 8-1, Dedicated RS-232 Connection (Within 10 Feet), shows how to cable a dedicated RS-232
AUDIX connection when the AUDIX systems are within 10 cable feet. Figure 8-2, Dedicated RS-232
Connection (Within 50 Feet), shows that an RS-232 extender cable is used when the distance between
systems is greater than 10 cable feet apart, but less than 50 feet. Figure 8-3, Dedicated RS-232 Connection
(Using Z3A ADUs) shows how to install and wire a dedicated connection that requires data sets to extend
the distance capability beyond 50 feet.
Within 50 feet (15.25 meters), the data rate may be up to and including 19.2 Kbps. Within 20 feet (6.1
meters), the data rate may be up to and including 64 Kbps. When data sets are used, check the
documentation provided with the data sets for supported data rates.
8-1