Alcatel 1660SM Technical Handbook page 542

[5] SDH interfacing with Back Panel (TTF and LVC)
The TTF block is connected to the two central boards (MATRIXN) through 1 +1 links @622 Mbit/s in LVDS.
TTF (Transport Terminal Function) block provides SDH termination for Regenerator Section and Multiplex
Section.
The LVC block is connected both to the HPC matrices and to the LPC matrices on the MATRIXN card
through couple of 1+1 links @ 622 MBit/s working in protection, LVDS format, STM–4 equivalent capacity.
LVC circuits perform the HOA function (Higher Order Assembler) and the Lower Order functions LTCM
or LTCT sink, LPOM or LSUT sink, LSUT source and LTC source up to 4 STM1 equivalent.
[6] Local Microprocessor
It controls and supports the Ethernet functionalities (Ethernet Physical Interface, Ethernet Switch Module
and Ethernet Mapper): configuration, alarms and states collections, performances monitoring,
communications with the OS (SNMP).
The microprocessor is provided with relevant devices SDRAM (for data memory), Flash EPROM (for
program memory) and Compact Flash.
External Shelf Controller (SC) controls SDH related circuits by ISPB bus.
[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.
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