Circuit Pack Descriptions
Issue 8.0 July 2002
7-11
SYSMEM (LAA25) Circuit Pack Description 7
Purpose of Circuit 7
The System Memory (SYSMEM) circuit pack provides the nonvolatile memory
necessary for storing the executable code and data for the system. The SYSMEM
circuit pack also contains the office alarm circuitry and the processor parallel
input/output (I/O) circuitry.
Faceplate LED 7
The SYSMEM circuit pack has a red FAULT LED on its faceplate (Figure 7-3).
The red FAULT LED is lighted during a reset condition, when a circuit pack failure
is detected or when the circuit pack loses power. If the circuit pack loses power, a
separate path is provided for power from the System Controller (SYSCTL) circuit
pack to light the FAULT LED on the SYSMEM circuit pack.
Figure 7-3. SYSMEM (LAA25) Circuit Pack
SYSMEM
LAA25
xxxxxxxxx_
FAULT
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