14 modular cabinet connection board, 15 synchronization distributionboard – Nortel Networks DCT1900 User Manual

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Technical Product Manual - DCT1900

System Description, Radio Exchange Boards

System-DCT1900/R8/mw

4-11

4.14

Modular Cabinet Connection Board-MCCB (ROANB 101 28)

The MCCB provides connectors for a personal computer, a printer, 3 DTU E1 boards (coax
connections), Base Station powering, for 7 CLU boards or SLU boards, and a general alarm (via a
relay). The MCCB is located on the bottom plate of the Modular Cabinet.

4.15

Synchronization Distribution Board–SDB (REX-BRD0006 or ROANB 101 38)

The SDB allows the connection of one input and three output synchronization signals to the CPU
via 120

ohm shielded twisted pair cables. It is located on the bottom plate of the Modular Cabinet

near the MCCB. The synchronization signals are required to achieve PWT air interface
synchronization between DCT1900 systems to allow seamless inter system handovers.