User Manual

Demand Assignment
System Overview GSI 003
605-0000-450
Draft Issue 1.3dr Date 8/02/00
Page 4 of 8
9. Central Terminal (CT)
9.1. General Description
The 2.2m high ETSI style AS4000 CT equipment racks containing multiple shelf
assemblies. These house the equipment necessary to support from one to 60 customer
radio links and from one to four 2Mbit/s CAS or DASS links to the Access
Concentrator. (see Figure 11).
Modem Shelf 1
RF
Combiner
Shelf
Modem Shelf 2
Modem Shelf 3
Modem Shelf 4
Alarms and
Breakers
2.2m
600mm600mm
300mm
CT Rack Expansion Rack
Figure 11. AS4000 DA CT Equipment Racks (covers removed)
9.2. Power Requirements
Each Rack requires two DC power supplies. The supply can range from -22 Volt to -60
Volt DC. The input current for a fully loaded DA Rack is 25 Amps at 22 Volt reducing
to 9 Amps at 60 Volt (540W) and for a fully loaded Expansion Rack is 11 Amps at 22
Volt reducing to 4 Amps at 60 Volt (240W).