Network Card User Manual

Cisco AS5800 Product Overview 1-27
Dial Shelf Filter Module
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 circuitry for monitoring power 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 isolation circuits.
The DC power passes through a broadband EMI filter in the filter module, then passes to a
DC-to-DC converter on the dial shelf controller card, where it is converted and then routed 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 maintenance bus (MBus) module with a logic 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 minimum 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.
Figure 1-15 shows a filter module installed in the rear of a Cisco 5814 dial shelf.