4
System Ports (After Removing Side Cover)
The PSTN or [BRI1, BRI2] port locations are clearly identified on the equipment.
CO3.4/BRI2 port
CO1.2/BRI1 port
Memory backup switch
SIO port (For RS-232C)
MISC port (general-purpose dry contact/
external music source port/
External Page port)
DLI ports (Digital line interface ports:21-24)
SLI ports (Single line interface ports:25-28)
Battery port
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