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Other functions
Other functions implemented are:
•
RIBUS I/F
This block is used to read/write from/to the "RIBUS" stream, to control the LED on the unit, to
release the Management–bus in case of power failure, and to use the remote inventory.
•
REMOTE INVENTORY
It is the memory containing the board information, for identification purposes (see para. 3.17
on page 370 for details).
•
M–BUS Driver
It drives the input–output gates of the Management–bus. These drivers can be disabled (by the
Bus–OFF signal) in case of power failure.
•
DC/DC CONVERTERS
This block converts the –48/–60 V power supply to the following voltages:
•
3.3V and 2.5V used to supply all the components in the board
•
–5.2Vto supply the optical module
The DC/DC converter is synchronized with a synchronization clock at 300 MHz (signal
Power–Sync, generated by GA) in order to avoid EMI problems.
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