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SLC Board
The SLC (Subscriber Line Circuit) board provides the connection between a general analog
telephone and the SMG-3200 system, and can be installed in the universal slot (US1, US2) of a
system. The SLC board for the SMG-3200 system comes in a SLC board with 8 ports, and each
port provides a connection to an analog telephone.
The features and functions of the SLC board are as follows.
y It provides a current of -48VDC for the connected subscriber telephone.
y It provides the ring signal that indicates the subscriber telephone is ringing.
y It reads the hook ON/OFF status, dial pulse, Ring trip, call answer status of the subscriber
telephone.
y It protects the subscriber circuit and SMG-3200 system from lightening or high voltages,
AC voltage crossing etc. that are generated from the subscriber line.
y It converts the analog signal into a digital signal with the PCM method to send them to the
control module. It also converts the digital signal with the PCM method into an analog
signal.
y It provides hybrid function to separate the sending path and receiving path from the analog
voice signal.
Front Panel
SLC Board with 8 ports
The following table shows the meaning of the LED indicators on the front panel of the SLC board.
LED
LEDLED
LED Color
ColorColor
Color Description
DescriptionDescription
Description
P1, P2, P3, P4
P5, P6, P7, P8
Green LED is on during each port in use.
SLC
P1 P3 P5 P7
P2 P4 P6 P8
P1 P2 P3 P4 P5 P6 P7 P8