Interface Card (If) Redundancy; Typical Cross-Connect Wan Card Redundancy Switch In Progress - Zhone IMACS 8000 User Manual

System Configuration and Operation
Figure 5-80.Typical Cross-Connect WAN Card Redundancy Switch in Progress

5.30 Interface Card (IF) Redundancy

The Interface card (8000-IF, 8000-IF+EXT and 8000-IF+MODEM) cannot be spared in the
shelf for redundant operation. This card contains both the copper traces for the WAN
interfaces, but also contains the terminal driver technology and can provide an on-board
MODEM interface and timing sync card depending on the type of IF card installed. In order
to provide redundancy, the IF card has been split into two parts, whereas the outward facing
WAN facilities are on one half of the card, while the other half contains all the logic parts to
provide intelligent operations. This separates active and passive components on the card, and
should an active device fail for any reason, the upper half of the IF card can be field replaced.
This splitting of active and passive operations of the unit supplies the ability to replace any
failure in the field while maintaining WAN connectivity. By this method, the IF card provides
a redundant operation that can be serviced in the field.
Reference Guide
Interface Card (IF) Redundancy
5-99