Ergonomics and Flexibility

Ergonomics

• Would like no more than two 9U crates per rack
• Centrally located for easy access and maintenance and to minimise accidental damage
• Other services (power supplies, 6U crates, bulk cabling, DCS, scopes, computers, monitors, network) above, between, below or in racks out of the critical path
• Quadrant architecture suggests a 2*2 layout is ideal...
• ...and doesnt take much extra cable path (because of the fanout to multiple crates)
• The (probably) eight crates of receiver modules are also likely to be naturally arranged in pairs rather than threes
• Separate racks for each system. Required(?) for receiver station grounding. Also to ease installation and commissioning phase

Flexibility

• Critical latency path might change
• Maybe more subdetectors will want TTC crates close to CTP
• We might need more nearby crates than we expect
• ...
• Aim for a layout which can accommodate some growth