Alcatel 1660SM Technical Handbook page 538

[7] RIBUS interface
This block is used to read/write from/to the "RIBUS" serial stream (SPI: serial peripheral inventory), 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.
The following information/alarms coming from the boards are collected and sent to EQUICO:
– Card type and slot identification
– Alim alarm : it arises in case of card power failure
– ISPB control: it disables the card access to the ISPB bus in case of board power failure or incase of
generic board failure.
– LED control: it commands the on/off status of the green/red INT LED present on each card.
Moreover the component permits to read/write the remote inventory.
[8] Power supply
This block converts the 48/60 V power supply, to obtain the voltages used to supply all the components
in the board.
Ethernet card internally uses five different power voltages.
The following voltages are needed: +3.3V , +2.5V, +1.8V, +1.5V, +3.3VS.
The other functions implemented on the board are:
•
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 (ISPB: intra–shelf parallel bus). These
drivers can be disabled (by the Bus–OFF signal) in case of power failure.
DC/DC CONVERTERS
•
LEDS and Push–buttons
The board presents, on its front panel, nine LEDs, the use and meaning of the LED and of the
frontal connectors is reported in Figure 45. on page 135.
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