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Other functions implemented on the board are:
•
RIBUS I/F
This block is used to read/write from/to the "RIBUS" serial stream, to control the LED on the unit,
to release the Management–bus in case of power failure, and to use the remote inventory.
RIBUS I/F is powered by the + 3.3 VS supplied by the rear access panel.
•
REMOTE INVENTORY
It is the memory containing the board information, for identification purposes (see para. 3.17
on page 370 for details about Remote Inventory information).
•
M–BUS Driver
It drives the input–output gates of the parallel 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 obtain the voltages used to supply all the
components in the board.
The DC/DC converter is synchronized with a synchronization clock at 300 MHz (signal
Power–Sync, generated by the SDH asic) in order to avoid EMI problems.
•
LEDS and Push–buttons
The board presents, on its front panel, some LEDS and push–buttons; the meaning of these
LEDs and Push–Buttons is reported in Figure 50. page 140. and Figure 51. page 141.
•
Buses
The main buses on the board are:
SNMP: serial bus to carry SNMP (Simple Network Management Protocol) messages between
the EC and the intra board controller, for information about MPLS network configuration. This
link is implemented by means of the DCC–EC bus from EC on EQUICO unit.
ISSB–EC: Intra–Shelf–Serial–Bus from the EC, to communicate software data (download,
etc.).
ISSB–SPARE: serial bus to the spare MPLS unit (if any) to communicate EPS information (.
SDH–CS: from the EC, after derivation from the parallel "Management–bus" (M–bus), for
configuration and status information of SDH components.
MPLS–CS: from microprocessor, for configuration and status information of MPLS
components, it conveys ICMP packets.
RIBUS: serial bus from the SC (shelf controller on MATRIX unit), to communicate inventory and
peripheral data.
M–BUS: called also ISPB (Intra Shelf Parallel Bus), from the SC (shelf controller on MATRIX
unit), to communicate data about asics configuration, SDH alarms collection, etc.
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