Network Card User Manual

Cisco AS5800 Product Overview 1-13

Dial Shelf Backplane

The Cisco AS5800 is equipped with a field-replaceable backplane module, which is designed to

meet critical safety, isolation, and electromagnetic compatibility (EMC) requirements. The

Cisco 5814 dial shelf backplane includes 14 slots that seat the ingress trunk cards, the modem cards,

and the dial shelf controller cards. Figure 1-6 shows the Cisco 5814 dial shelf with no cards installed,

as viewed from the system front.

Figure 1-6 Cisco 5814 Dial Shelf Backplane—Front View

The dial shelf backplane contains no active components, except for the nonvolatile random-access

memory (NVRAM) used for system identification. This is located toward the top of the backplane

and provides 1024 bits of nonvolatile read-write memory.

The dial shelf backplane contains the connectors that connect directly with the dial shelf cards and

dial shelf controller cards. It also includes a 20-pin molex MiniFit connector that connects to the

blower assembly. The dial shelf backplane also includes additional maintenance bus (MBus)

connectors to the power-entry modules (PEMs) and filter module, which are used for monitoring

environmental conditions. These backplane connectors are shown in Figure 1-7.

Note Figure 1-7 shows a rear view of the dial shelf backplane after the PEMs, filter module, and

chassis back panel have been removed.

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