PART 2. HARDWARE DESCRIPTIONS
2.1 KEY SERVICE UNIT
The iDCS 100 (see Figure 2–1) is a metal cabinet containing the following:
! A power supply (120 VAC) with battery backup (48VDC) connection
! Processing, switching and the system operating program
! Eight 2B + D digital keyset interfaces
! One MOH/BGM input source (switch selectable between internal chimes and external
input)
! One page output
2.2 EXPANSION CABINETS
One of two optional cabinets may be used (see Figure 2–2) and they consist of a metal
case containing a backplane PCB. The first type of expansion cabinet (type-A) comes
with connectors for three expansion cards and a fourth connector for either a Samsung
Plug-In Voice Mail Card or a Digital Trunk Card (TE/PRI). The second type of expansion
cabinet (type-B) comes with connectors for two expansion cards and a third for a Samsung
Plug-In Voice Mail card and a fourth for a Digital Trunk Card (TE/PRI). The expansion
cabinet (type-A or type-B) is installed to the right of the basic KSU and connects to the KSU
motherboard via a ribbon cable and two pairs of wires.
2.1
FIGURE 2–1
FIGURE 2–2
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