Nortel Networks DCT1900 manual CAS REX-BRD0002 or 2/ROFNB 157 13/1, DTU-E1 -CAS

Technical Product Manual - DCT1900

System Description, Radio Exchange Boards

4.6.2 CAS - REX-BRD0002 or 2/ROFNB 157 13/1

DTU-E1 CAS is used only in standalone configurations. The DTU provides the digital interface between the PBX and the RE. The physical connection with the PBX is established via twisted pair cables.

Every DTU board contains 2 DTCs (see Figure 4-5), each equipped with identical firmware. Both DTCs support the Channel Associated Signalling (CAS) interface.

Each CAS interface provides 30 (total 60 per board), communication channels to which Portable Telephones are assigned statically. Each channel is dedicated to a specific Portable Telephone number. The maximum number of Portable Telephones a RE can handle is 600. This is supported on 10 DTU E1 CAS cards.

BC

BC

DTC2
L2	L1

L2	L1
DTC1

Channels 31 - 60

Channels 1 - 30

2 Mbit/s Trunk

2 Mbit/s Trunk

Fig. 4-5 DTU-E1 -CAS

4-6	System-DCT1900/R8/mw
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