Specifications
Overview
20 Comdial October, ‘03
Each digital port (connects to Digital Executive Telephones and DSS Consoles) is comprised of a pro-
prietary octal ASIC (Application Specific Integrated Circuit) transceiver. There are three data
channels in operation at each digital port via the octal transceiver. One channel is used for call pro
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cessing control of digital terminal functions/operations and two channels are used for the digital voice
channel requirements.
Each digital station interface is protected against circuit wiring shorts by an over-current protection
Polyswitch. The digital station circuit requires only one cable pair to operate and is not polarity sen
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sitive.
Physical connection of digital extensions, power failure telephones, and CO lines to the 408M module
is made through convenient RJ-11 connectors along the bottom edge of the module.
1.7 408E (KSU II Component)
The 408E is very similar to the 408M; however, it is unique to KSU2. The 408E provides interface for
up to 4 loop-start CO lines and 8 digital extension ports. In addition, the 408E regulates the 24-volt
DC power from the source to produce all required logic voltages and operations voltages. There is also
a Power Failure Port located on the 408E that is associated to the first CO line circuit. Whenever
power fails this port becomes active with dial tone from the CO line connected to the first CO line port.
Figure 1-4 KSU2
The 408E is equipped with a heartbeat LED that indicates processing activity on the PCB; the 408E
peripheral processor is operating when the heartbeat LED is flashing. The KSU2 operation LED
(located next to the power switch) is tied to the 408E heartbeat LED, therefore, when the LED next to
the power switch is flashing, the 408E is active.
The KSU2-408E connections are almost identical to those on the 408M (KSU1); the exception is the
long shielded cable used to connect KSU2 to the CPM inside of KSU1. Note: There is no standard
APM4 installed inside of KSU2.
Each CO line circuit incorporates over-voltage protection, ring detector, loop detector, loop/pulse-dial
relay, current sink circuit, coupling/isolation transformer (impedance 600:600), hybrid circuit, CODEC
& filter, polarity guard circuit and Radio Frequency noise filter.