Serial Interface Unit (Siu2); Phase Lock Loop Unit (Pllu) - STARPLUS Triad 1 Product Description Manual

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Chapter 11 - Triad 3 System Configuration

Serial Interface Unit (SIU2)

The SIU2 is added to the MPB to provide two additional RS232C ports for system use. The
connectors on this unit are RJ48 type connectors. There are a total of two connectors on this
board.

Phase Lock Loop Unit (PLLU)

The PLLU must be added to the MPB board whenever a T-1 or PRI board is installed in the
system. This board regulates the T-1/ISDN clock signals from the T-1/PRI board to the
network. One PLLU supports all T-1/PRI boards installed in the system.
Figure 11-26: SIU2 (Serial Interface Unit)
Figure 11-27: PLLU (Phase Lock Loop Unit)
Optional Units