Nortel Networks DCT1900 manual DTU-T1 CAS

Technical Product Manual - DCT1900

System Description, Radio Exchange Boards

4.7Digital Trunk Unit - DTU-T1 CAS (REX-BRD0021 or 2/ROFNB 157 13/2)

DTU T1 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 100 ohm twisted pair cables.

Every DTU board contains 2 DTCs (see Figure 4-6), each equipped with identical firmware. Both DTCs support the Channel Associated Signalling (CAS) interface.

Each CAS interface provides 24 (total 48 per board), communication channels to which Portable Telephones are assigned individually. 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 13 DTU T1 CAS cards.

BC

BC

DTC2

L1

Channels

25 - 48 1.544 Mbit/s

Trunk

Channels

1 - 24

1.544 Mbit/s

Trunk

DTC1

Fig. 4-6 DTU-T1 CAS

System-DCT1900/R8/mw	4-7
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