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L2 I O Transfer James T Linnemann Michigan State University Trigger Meeting February 20 1998 Michigan State University 01 13 19 Current Status MBus VME TCC M P M L3 V B D W o r k e r A d m i n Inputs M B T SCL Outputs to Global preprocessors only L2 Answer 128 L2 HWFW Global only 8 VME slots minimum Dec Alpha Unix JTL MSU 12 18 97 Michigan State University 01 13 19 L2 Global Inputs L2 Global Inputs via MBT card MBT propose Fiber 160 Mb s Requires SLIC have one Fiber output Question is SCL Fanout Fiber or Copper Advantages Simpler to set up than copper balancer transformer Less fussy to make work separation of grounds if move out of MCH Michigan State University 01 13 19 L2 Input Fiber continued Disadvantages of Fiber FIC needs fiber to serve MBT copper for SLIC more expensive 60 channel or so including cable fiber Cost for both ends or one beware of finger prints patch panel more complex costly needed to re cable if L2 in Fixed Counting House and MCH moves Michigan State University 01 13 19 Fiber Input Converter Inputs only g link transfer from L1 CFT PS assuming 8 10 or 16 20 encoding for integrity g link Speed requirements of STT input recycle engineering of VRB inputs STT needs raw data Outputs Cypress 160 Fiber MBT 160 Copper SLIC Michigan State University 01 13 19 L1 CFT Outputs to FIC Begin and End Event as g link Symbols not as values of data Not in Gray code Padded to 16 B 3B Crossing number to match L1 accept Header and Trailer consistent with L2G input specs PS data on fibers separate from CFT fibers Bytes produced so no swapping on FIC needed Michigan State University 01 13 19 Byte non swapping Source s responsibility NONE on MBT card Send bytes to Cypress in order such that when assembled in Alpha they have specified order B1 B2 B3 B4 Will provide final spec so multi byte quantities 3B crossing number 2B eta etc come out right in Alpha Do L1CFT 2B quantities have fields crossing Byte boundaries Michigan State University 01 13 19 L2G Header trailer 12B



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