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Optional Units
Memory Expansion Unit (MEMU)
The MEMU is added to the MPB board to provide an additional 512K of RAM to the system.
Message Wait Board (MSG12)
The MSG12 is an optional board for the Single Line Interface Board (SLIB). The MSG12
provides message waiting voltage to SLTs connected to it.
The MEMU is required whenever the system capacity exceeds 48 CO Lines by 96
Stations.
Figure 11-28: MEMU (Memory Expansion Unit)
Figure 11-29: MSG12 (Message Wait Board)
Chapter 11 - Triad 3 System Configuration
11-33
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