Cisco AS5800 Product Overview 1-27
Dial Shelf Filter Module
The Cisco AS5800 is equipped with a passive DC power filter in the dial shelf, which contains a
broadband electromagnetic interference (EMI) filter and circuit ry for monitori ng powe r coming into
the dial shelf. The DC power filter is housed in the filter module, which resides in the dial shelf
between the two PEMs.
The DC power filter supports the following functions:
•DC-input power filtering and power distribution
The filter module first receives –48 VDC power from the PEMs using analog is olation circuits.
The DC power passes through a broadband EMI filter in the filter module, then pa sses to a
DC-to-DC converte r on the dial sh elf controller c ard, where it is c onverted and then r outed back
to the backplane for distribution to the dial shelf cards. A single filter module supports a fully
configured dial shelf.
•Maintenance monitoring
The filter module contains the environmental maintenanc e bus (MBus) mo dule with a logi c card,
which carries monitor signals throughout the dial shelf by way of two 10-pin molex MiniFit
connectors.
The front and top of the filter module are perforated for mi nimum air flow restriction. There are no
connectors accessible from the front; however, a DB-9 connector at the base of the filter module
(visible only from below the dial shelf) connects a monitor cable to an optional AC-input power
shelf.
Figure1-15 shows a filter module installed in the rear of a Cisco 5814 dial shelf.