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[3] MATRIX
The matrix is in charged of cross connect the incoming and outgoing cells according to the information
received by the microprocessor. In case of Soft Permanent Virtual Connection ( Soft–PVC) the P–NNI
signalling is supported.
[4] MICROPROCESSOR
The microprocessor present on the board performs the following functionality:
–
configuration, alarm and status gathering of the ATM devices present on the board
–
handling of the signalling packet receive from the matrix in case of Soft–PVC
–
communication with the EC on the PQ2/EQC (SNMP Link); using this channel performance and
management date are encapsulated and sent to the EC and from there to the Craft Terminal or O.S.
All the LEDS (except that for Unit–Failure) are driven by the microprocessor.
The maeaning of the LEDs and Push–Button is reported in Figure 270. on page 486.
[5] Common part
•
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. RIBUS
I/F is powered by the + 3.3 Vdc supply by CONGI boards.
•
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
Starting from the 48/60 V power supply the following voltages are generated:
–
+ 5 Vdc used by the optical module
–
+1.5 Vdc, –3.3 Vdc, –3.3 Vdc, –3.3 Vdc, +2.5 Vdc used to supply all the components
in the board.
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3AL 91669 AA AA
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