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Memory expansion circuit pack
General description
The Expanded Memory circuit pack in slot 3 of the A and B chassis provides
Dynamic Random Access Memory (DRAM) for temporarily storing various
data in the DPP. DRAM is refreshed periodically by the CPU to maintain its
programmed state. Each expanded memory circuit pack contains up to 256
Kbytes (262,144 bytes) of DRAM. On the system level, DRAM provides
storage of temporary data, such as system calculations, and updating of
statistics.
See Table 4–1 for the jumper option settings on this circuit pack (these are
standard, not user–defined). Figure 4–1 shows jumper location and circuit
pack layout.
Replacing the Memory Expansion circuit pack
To replace the Memory Expansion circuit pack, use the following
procedure.
DPP Card Replacement Guide BCS35 and up
29
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