Specifications

2-1
Chapter
2
Hardware Descriptions
DCS-408 Basic key service unit System Structure
The DCS-408 Key Service Unit is a single cabinet containing the following :
Base Key Service Unit
y
A power supplies.
y
Processing, memory and switching :
CPU (68EC000), 1 Mbytes program memory, 256 Kbytes data memory with a backup super
capacitor, real-time clock.
y
Four (4) digital keyset interfaces.
y
Four (4) single line telephone interfaces with loop-disconnect facilities.
y
One (1) External Music source interface for Music-on-Hold and Background Music.
y
One (1) General-purpose Dry Contact
y
One (1) SIO connection for RS-232C connection.
System Capacity
Analog trunk
4 lines
Station
8 circuits (4 circuits for digital keyset and 4 circuits for analog
telephones)
Music-on-hold/ Background
music channel
1 (internal or external)
General-purpose Dry Contact
1
SIO port
1
The station circuits have a fixed configuration consisting of 4 circuits for digital
keyphones and 4 circuits for analog telephones , and the circuit configuration may
not be modified.