Network Card User Manual

Dial Shelf Field-Replaceable Units
Cisco AS5800 Universal Access Server Hardware Installation Guide1-14
Figure 1-7 Cisco 5814 Dial Shelf BackplaneRear View
The dial shelf backplane first receives 48 VDC power from the DC-input power supplies by way of
the filter module, and the power is then distributed throughout the dial shelf. The DC PEMs connect
to the backplane using four blind-mating 1.25-in. power studs, which are located near the bottom of
the backplane.
Three bus connections are routed over the backplane:
The backplane interconnect bus (BIC bus) connects the dial shelf cards to the dial shelf controller
cards and provides communication between the dial shelf and the router shelf.
The TDM bus transmits clocks and frame pulses to all dial shelf cards and dial shelf controller
cards.
The maintenance bus (MBus) monitors system environmental conditions.
For detailed specification tables, refer to Appendix A, Cisco AS5800 Specifications.
H11278
Blower assembly
connector
Dial shelf backplane
Power studs