1. USC 55 Layout w/Rack Wizard View from the front of the racks, crate arrangement is necessary for sharing of e/  data on cables. To GCT Spare Rack

2. Remapping of crates in USC55 necessary to reduce latency*.  = 0º is closest to electronics hall. Figures will updated in new document - and resubmitted. *http://cmsdoc.cern.ch/ ~wsmith/USC55_racks_v55.html

3. HTR to RTC crates organized for shortest paths Two sets of HF cables set the longest path.(<10m).

4. Remarks: We can organize our crates to have HTR to Cal Regional trigger cables less than 10 meters. (10 meter target proposed by trigger group). With 10 meter cables we have some room to change the organization of HB and HE HTR crates. We may want to do this for the following reasons: Unforeseen complexities with fiber mapping in the patch panels. This needs to be looked at in detail (including calibration readout). Optimize optic cable lengths. HF appears to be the longest, so I don’t believe that this would gain us much. This should be checked once solid HF length numbers are available. HO? Other reasons? With the information available to me at this time I have no objections to the trigger crate layout presented during electronics week, and believe that we can comfortably fit within the proposed 10 meter cable limit.