Vodavi STARPLUS Triad XTS, Installation Manual

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CO/PBX Connections 3-41
Chapter 3 - System Installation
(3) T1IBs and (2) BRIBs
The clock OUT cable from T1IB1 should be connected to the clock IN cable of the T1IB2 and
the clock OUT cable from T1IB2 should be connected to the clock IN cable of T1IB3. SW3 of
T1IB1 should be in the ON position, and SW3 of T1IB2 and T1IB3 should be in the OFF
position. The two BRIBs are not connected with clock control cables and SW2 of the BRIB
cards are placed in the OFF position.
Clock Chain Using T1 / PRIB / BRIB
The following four illustrations are clock chain examples that apply to PRIB or T1 use. Arrows
on the illustrations represent data flow. The BRIB clock chain is similar, in that you always
connect:
†
IN of LMU1 to OUT of the BRIB closest to the LMU1
†
OUT of a BRIB in Cabinet 1 to the IN of next closest BRIB
†
IN of LMU2 to OUT of the BRIB closest to the LMU2
†
IN from a BRIB in Cabinets 1 or 2 to the next closest BRIB
†
IN from the last BRIB to OUT of LMU2.
The callout of Figure 3-24: Case 1 of Clock Chain , that pertains to setting the Clock Source
Switch to either PRI/BRI or T1, is applicable to all examples.
The expanded view callout at the top right of Figure 3-26: Case 3 of Clock Chain shows the
connectors on LMU2 when there is a T1 or ISDN card in the associated Cabinet. The expanded
view callout at the middle right of the same illustration shows the connection required for
Cabinets 1 or 2 when the Cabinet(s) do not have T1 or ISDN cards in use.
T1IB1 T1IB2 T1IB3 BRIB1 BRIB2
SW3 On SW3 Off SW3 Off Switch 4, SW2 Off Switch 4, SW2 Off