Srb data transmission
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SRB data transmission. Vito Palladino CERN 2 June 2014. Reminder. The total amount of SRB per station is 8 Each SRB provides readout of half a view (256 straws) The communication protocol is UDP and JUMBO frames are foreseen (9kB), without fragmentation Two possible read-out modes:

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SRB data transmission

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Srb data transmission

SRB data transmission

Vito Palladino

CERN

2 June 2014


Reminder

Reminder

  • The total amount of SRB per station is 8

  • Each SRB provides readout of half a view (256 straws)

  • The communication protocol is UDP and JUMBO frames are foreseen (9kB), without fragmentation

  • Two possible read-out modes:

    • Triggerless (TL)

    • L0 trigger matching

  • Straw is crucial for L1 trigger logic

  • SRB prototypes (2-5) delivery mid July, full production (32) expected mid September (for details see Peter’s talk at Straw WG, June 2)


Data throughput in tl m ode

Data Throughput in TLMode

  • The data throughput has been estimated, the following data are the inputs I used:

    • average rate per straw: 60kHz (maximum luminosity) or a fraction of it

    • Correction factor for extra hits: 1.3

    • Burst duration: 5s

    • SPS super-cycle: 15s

    • N bursts per day: 5760

    • Transmission type: UDP jumbo frames (9kB)

    • The UDP packet length is limited at 9kB per packet in order to fit in one Ethernet frame (no fragmentation)


Data throughput dt

Data Throughput (DT)


Possible solution for tl mode

Possible Solution for TL Mode

SRB8

SRB8

SRB8

SRB8

Opt Switch

Straw 1

Straw 2

Straw 3

Straw 4

SRB7

SRB7

SRB7

SRB7

2x1Gb/s

SRB6

SRB6

SRB6

SRB6

2x1Gb/s

SRB5

SRB5

SRB5

SRB5

2x1Gb/s

SRB4

SRB4

SRB4

SRB4

2x1Gb/s

10(+10)Gb/s

SRB3

SRB3

SRB3

SRB3

2x1Gb/s

SRB2

SRB2

SRB2

SRB2

2x1Gb/s

SRB1

SRB1

SRB1

SRB1

2x1Gb/s

Opt Switch

2x1Gb/s

10Gb/s

Merger

10Gb/s

10Gb/s

PC

10Gb/s

PC

10Gb/s

1Gb/s

PC

10Gb/s

1Gb/s

PC

10Gb/s

1Gb/s

PC

10Gb/s

1Gb/s

PC farm

PC

1Gb/s

PC

1Gb/s

PC

1Gb/s

1Gb/s


Conclusions

Conclusions

  • At full luminosity:

    • We need:

      • Both Gb ports from the SRB to the switch (not yet implemented in the fw)

      • The second 10Gb/s link to the PC farm (not installed)

    • The data transfer rate from the PC farm to the merger is NOT enough to sustain our rate (a L1 trigger selection is needed) even if we transmit data off spill

  • The TL mode will be the first step in order to test the detector (connectivity, timing, alignment, etc.)


Ongoing activities

Ongoing Activities

  • Infrastructure:

    • Switches (network) and optical links (trigger and clock) will be installed by next week.

  • Firmware and network test:

    • A test board with Gb connectivity will be used to test the infrastructure and data transmission to the PC farm, the fw could be adapted to the SRB.

  • PC farm:

    • Jonas is working to modify the PC farm in order to receive the data in straw TL mode (1 SRB sends data to 1 PC).

    • The L0 trigger matching do not requires any extra work.


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