Base Board - Tadiran Telecom Emerald ICE Installation Manual

2.6
Figure 2-6

Base Board

2-8
Emerald ICE Installation & Hardware Reference Manual
Base Board
The Base Board is unique to KSU4. It provides connecitivity with peripheral
boards. Additionally the Base Board regulates the 24 volt DC power from the
source to produce all required logic voltages and operations voltages.
The KSU4 operation LED (located next to the power switch) is tied to the CCB
(KSU3) LED. Therefore, when the LED next to the power switch is flashing, the
CCB (KSU3) is active.
A long shielded cable is used to connect KSU4 to the CCCB inside of KSU3.
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 sensitive.