1 / 7

SRB data transmission

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:

dick
Download Presentation

SRB data transmission

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. SRB data transmission Vito Palladino CERN 2 June 2014

  2. 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)

  3. 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)

  4. Data Throughput (DT)

  5. 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

  6. 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.)

  7. 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.

More Related