CONTENTS
PART 2. HARDWARE DESCRIPTIONS
2.1 KEY SERVICE UNIT
The DCS COMPACT Key Service Unit (see Figure
2–1) is a single plastic cabinet containing the follow-
ing:
l
A power supply
l
Processing, switching and the system operating
program
l
Four Caller ID compatible loop start C.O. inter-
faces with a replaceable 4 C.O. protection card
(4COP)
l
Eight 2B+D digital keyset interfaces
l
One MOH/BGM input
l
One page output
l
One auxiliary relay
l
Power failure circuits for the first two C.O. lines
2.2 EXPANSION KIT
The optional expansion kit (see Figure 2–2) consists of a backplane PCB with connectors
for three 2 x 4 expansion cards and a plastic rack to support the cards. The kit is installed
inside the basic KSU and connects to the KSU motherboard via a 50 pin ribbon cable and
two pairs of ground wires.
2.1
FIGURE 2–1
FIGURE 2–2
