Dial Shelf Field-Replaceable Units
Cisco AS5800 Universal Access Server Hardware Installation Guide1-14
Figure1-7 Cisco5814 Dial Shelf Backplane—Rear View
The dial shelf backp lane first receives –48 VDC power from the DC-input power supplies by way of
the filter module, and the power is then distr ib uted t hroug hout the dia l shelf . The DC PEMs c onnect
to the backplane using four blind-mating 1.25-in. power s tuds, whic h ar e loca ted near the bott om 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 s helf cont roller
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 AppendixA, “Cisco AS5800 Specifications.”
H11278
Blower assembly
connector
Dial shelf backplane
Power studs