MAIN USER REQUIREMENTS

DATA TRANSMISSION:

~700 DDLs shall transmit in total 2.5 GB/s event data from the FEE to the RORC;
data transmission speed for each link from the FEE to the RORC > 100 MB/s;
data transmission speed for each link from the RORC to the FEE > 10 MB/s;
detected bit error rate (BER) < 10-15;
flow control in both directions.

TECHNICAL PARAMETERS:

lifetime > 10 years;
power consumption of the SIU < 5 W;
radiation tolerant SIU for the ALICE ITS detector;
footprint of the SIU < 50 cm2 (<15 cm2 for the ALICE ITS detector).

CONTROL AND TEST:

both the FEE and the SIU shall be remotely controlled by the RORC through the DDL;
stand-alone self-test mode;
remote test mode for the FEE by using JTAG Boundary-scan Testing (IEEE 1149.1).

http://consult.cern.ch/alice/Internal_Notes/1996/42/abstract

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Notes:

The main data flow will take place from the FEE to the RORC. The 700 DDLs shall transmit in total 2.5 GB/s event data from the FEE to the RORC with a detected bit error rate of < 10-15. Each DDL shall be able to transmit data at a rate of 100 MByte/s with flow control. As the zero suppression algorithm requires downloading blocks of data into the FEE, a throughput of 10 MByte/s is needed in the opposite direction.

Since the SIU is located inside the detector, the requirements for the lifetime (> 10 years), the power consumption (< 5W) and the footprint (< 50 cm2) of this unit are key issues. More strict requirements have been identified for the ITS sub-detector where radiation tolerant electronics is needed and the maximum footprint of the SIU shall be less than 15 cm2.

Both the FEE and the SIU shall be remotely controlled by the RORC through the DDL, since their placement inside the detector will not allow using any other cabling apart from the DDL medium.

To achieve the high reliability of the experimental apparatus, efficient test of all the sub-systems shall be provided. The DDL shall allow to test the FEE remotely by using JTAG Boundary-scan Testing procedure. The DDL itself shall also have a powerful self-test mode.