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Chapter 2
System Boards
Front Panel
LOOP Board with 8 ports
The following table shows the meaning of the LED indicators on the front panel of the LOOP
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.
E&M Board
The E&M (E&M Tie Trunk Module) board provides a 4-Wire E&M dedicated line for connection
of SMG-3200 system and private branch exchange (PBX) or key telephone system (KTS), and can
be installed in the universal slot (US1, US2) of a system. The E&M board for the SMG-3200
system comes in an E&M board or 4W E&M board with 8 ports.
The E&M board has two independent voice lines to send and receive the signal where this line is
used as a dedicated line. The sending side consists of a Tip and Ring while the receiving side
consists of a Tip1 and Ring1. Because signal and voice circuits are separated from each other, the
transformer does not need the DC power feeding. The DC signal generated in M-LEAD and also
detects in E-LEAD.
The E&M board is divided into the type 1 E&M and type 2 E&M according to the circuit ground
way. The type1 is used in the case of grounding on the opposite side. The type 2 is used in the case
of grounding on the access side of port.
The E&M board has 2 independent transformers to send/receive voice signal in each port. The
board’s hybrid is used for 4stage control gain in each port where the line interface controller
provides the relay point to control the M-LEAD signal and read/write logic.
LOOP
P1 P3 P5 P7
P2 P4 P6 P8
P1 P2 P3 P4 P5 P6 P7 P8