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Cabinet Descriptions
Coral FlexiCom 6000 Installation Manual
Cabinet Descrip
tion
s
6
Each cabinet is equipped with a power distribution network consisting of bus bars and
wire conductors. Through this network, supply voltages are distributed throughout the
cabinet to the circuitry which require them.
Power enters the cabinet from a battery eliminator power supply, or from a power
distribution board; to the SGND, –48V IN, and 48V RTN IN power terminals located
in the power input cavity, in the upper right corner of the cabinet rear. See
Power Wiring beginning on page 2-11
The SGND terminal connects to the metallic frame of the cabinet. Note that the –48V
IN, or –48 volt supply is protected by a fuse located near the input terminal. The –48V
IN, and 48V RTN IN are then routed from the power input cavity to two bus bars
mounted along the right rear of the cabinet via.
The bus bar which runs closest to the backplane. The is the 48V RTN IN, or positive
side of the 48 volt power supply. The bus bar running closer to the back of the cabinet
is the –48V IN, or negative side of the power supply.
The 48V RTN IN bus is the signal common, or ground for all internal supply voltages
and signals; as well as for telephony signaling purposes, including Ground-Start and
E&M trunks, and RS-232 serial data ports. The positive output of the power supply or
power distribution board must be connected to an approved earth ground for proper
system operation.
The SGND terminal also must be connected to an approved earth ground through a
separate path (separate wire).
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10 Power Distribution
