Cable Routing

External Rules

• Route to/from detector is via four (small, slanted) holes in shielding wall The proposed layout is far from ideal, going to both sides of both floors. Try to renegotiate with safety group
• Meanwhile TC would like to increase the maximum cable length!
• The path from rack to rack is normally down and under the false floor...
• ...but front panel to front panel is OK
• (Almost) no cables between floors (except via long route)
• Layout of racks is also far from ideal with a large gap in the centre of the first row and only outlying racks in the second row

Internal Requirements

• Receiver crates will probably be split into +ve and -ve eta, barrel and endcap, EM and hadronic
• Summing across EM barrel/endcap transition connects pairs of EM receiver crates
• Each PPM crate spans all of eta and needs input from four receiver crates
• Each PPM crate feeds three CPM and three JEM crates
• Each CPM/JEM crate takes input from six PPM crates
• Cable runs from PPM to JEM/CPM may be limited to 10m (high speed digital signals)