Some remarks about cabling and patchbox connections 
for  data links (AOut,ADummy) and sc connections (status May 1 1999,
updated Jul 8 and Aug 25/26 1999)

- Per ladder/wheel a Combo Cable  is made, including the data link
  cables and the hybrid ntc cables (coordination in hands of R.C.)
  Specification Data Link Cable: Habia UBT 3601 ST2; STP ; 36 AWG;
  150 ohm/100m; 100 VDC; SPC; 0.39mm O.D.
- All non-sc cables have to be of equal length (to be measured).
  Differences  in length should be equalised within the detector
  volume or before the patch  box.
- The end flange of the MVD should have a cable slots for
  easy installation of the cables with connectors attached (drawing
  available). A 'Quick Tube Alu' cable mantle is  used for the cable
  bundles.
- The data link connections at the Patch Box side should be positioned 
  separately from LV,HV,SC,Digital; e.g. in case of a common PCB  per
  module in the patchbox one could introduce noise on the data link. 
- at the vetowall site of the patchbox the connection for the data 
  link is: standard RJ-45 connector (4 signal (AOut plus ADummy)
  output) on 4-pair  CAT5+ cable: Type 51H8169; 7.9mm O.D.
- at the detector site the following solution for the data link
  is favoured now:
	   * 5 stp-cables for a barrel ladder (or 4 for a wheel) are
	     stripped  and soldered to a D-connector (drawing
	     available);
	   * at the other side of the Patch Box a connection is made  
	     to a RJ-45 connector
	   * on the pcb impedances should be matched
  At the detector side : 30 barrel plus 14 wheel = 44 connectors
  At the veto wall side: 38 barrel plus 14 wheel = 52 connectors	   
- assumed is that the sc-cables on the hybrids (one temperature
  sensor per  ladder and two per wheel) are part of the combo cable.
  Connectors under study: specification will be given shortly. Laid
  separately and not included in the module bundles sofar:  sensors on
  3 ladders and 2 wheels: one sensor per Si-detector module (see also
  http://www-zeus.desy.de/~wiggers/slow_plan.html). But .. can they be
  included in the Combo Cable as well (R.C).)? 
  Also to be included: some (3) interlock temperature sensors. To be
  connected similarly as the other sc sensors. They should be spread
  over the sc-cables, to avoid simultaneous breakdown. 
  The sc connector type at the detector site of patch box for the
  detector ntc's and interlock sensors is:
  Solder Bucket (ITT Cannon) 37 Ways Plugs (Farnell order code 616-965)
  At the vetowall site of the patch box:
  Flat cable connector (3M) 37 Ways sockets (Farnell order code 469-440)
- since the ground of STP is difficult to connect, we could use UTP for 
  the sc cables instead of STP in the detector as foreseen before.
  From Patch Box to the vetowall area  flat cable in round format (37
  ways, diameter 11...12 mm) will be used.  
- Agreed is that the interlock cables go via the Cooling Rack to the 
  interlock system.  
- The outer side must be floating from the construction, but
  connected to the combo cable shielding. The construction
  inside is to mount the cables and  pcb's that connect the
  cables. All signals (gnd is defined as a signal) must pass the
  patchbox without any connection. The pcb's are isolated from
  the box.


 
Update Thu Jul 8 1999 
Update Wed Aug 25 1999