1. 1 Raw Event : ByteStream implementation Muon Workshop, 17-19 April 2002 A. Nisati, for the Muon Trigger group

2. 2 During data taking detector data are provided by the Readout electronics, up to the ROD, and then by TDAQ up to the event storage. Data decoding/encoding in software may be provided by software developers.

3. 3 For each muon detector (MDT, CSC, RPC and TGC) a contact person exists in the ROD working group; this people should provide the description of the raw data format up to ROD/ROB level; In addition, the format of the event as provided by the DAQ is also documented.

4. 4 The task of 1) defining the raw data format, 2) data decoding and 3) raw data simulation (encoding) involves the DIG, the TDAQ and the Muon software communities; We need to monitor the status of all needed documents, and identify a set of people available to perform the software task of data decoding (online: monitoring and HLT algorithms; offline: reconstruction packages) and encoding (raw data simulation).

5. 5 1.MDT many groups involved; detailed documentation on TDC/CSM/MROD/DAQ formats available; experience already exists in the Roma1/Roma3 thanks to the H8 Readout/DAQ activity. 2.CSC: see Brookhaven group; 3.RPC: Roma1 and Napoli groups involved; detailed documentation on the final data format is ready and it will be available to the community very soon; 4.TGC: see Japan/Israel groups; also in this case a detailed documentation is available. What is available today for the 4 muon detectors: