Date: Wed, 26 May 2004 13:02:33 -0400 (EDT) From: Dan Edmunds To: Marvin Johnson Cc: John T. Anderson , Alan L. Stone , Hal Evans , Paul Padley , 'Darien Wood' , Maris Abolins , Raymond L. Brock , Hendrik Weerts Subject: Re: paddle board On Tue, 25 May 2004, Marvin Johnson wrote: > Dan, > Is it possible to have the connectors on your paddle board modified for > the 3M D connector? If you do not have time and the schematic is in > orcad, I can have George Wolf do it. I would like to build a prototype > to test and having a paddle board with the correct connectors would be > very nice. > Marvin Hello Marvin, We made 5 or 6 versions of that paddle card to take care of the different arrangements of cables that we need to bring into the back of the Trigger Framework backplanes. I think that I did them all by typing in the ascii net lists, i.e. there are no schematics as such for any of them. The net list for the paddle card that we were looking at Monday afternoon is on the web: www.pa.msu.edu/hep/d0/ftp/l1/framework/hardware/pb_rear/ rear_paddle_brd_net_list.txt There is a whole section on that web site about those paddle cards about 2/3 of the way down in: www.pa.msu.edu/hep/d0/l1/framework/index.html But I do not have orcad schematics. I 100% strongly agree that for all of these cabling type projects, having a prototype or model of the component so you can hold it in your had and test it is very important. We can test any of these new cabling setups out on the sidewalk area. To verify that things will fit we could dress all the cables into a crate or a rack. For some of the 2004 shutdown (starting at the end of August) I will have the current L1 Cal Trig turned off so people can have the doors open and examine the current setup of the BLS cables. I assume that we should push to make the pinout lists at the 5 points of connection and from that we could make the net lists or schematics for the paddle card and for the patch panel. Connection points: existing BLS cable to patch panel patch panel to pleated foil cable patch panel monitor/test points pleated foil to paddle board paddle board to crate P2 (ADF-2 card analog input through P2) I know the pinout at the existing BLS connectors and of the ADF-2 card input (i.e. the P2 backplane connector). All of that stuff is on the web and I can show it to whoever will do this detailed work. Concerns: The crates are Wiener 6U VME-64X commercial crates. Will it require special mechanics in back of the backplane to support the paddle cards and the ton of cables ?? These crates have removable power supplies that are right under these cables. These cables will need to exit the back of the crate to the left and right to provide access to the power supply. Will the ERNI 5 row female connector (as used on the TFW paddle card that we looked at on Monday afternoon) fit into the Wiener P2 shrouds ?? These crates have the metric P0 connector. We are using (plugging cables into) the P0 connectors at 20 of the 21 slots. Do the ears on the ERNI connector interfere with access to the P0 connector? (I think that they do.) The top edge of the paddle card can not interfere with the P0 access. In back of the backplane we need to support / strain relief: the LVDS cables going into P0 the BLS cables going into paddle cards the top and bottom edges of the paddle cards I spent time this morning working with John Foglesong and Johnny Green. We made sketches of things, counted cables and circuits, and looked at all the existing stuff. I will send them a note with some follow up information. I want to thank you and John Anderson for helping Alan with this cable project. There are clearly lots of electrical issues that need to be thought about (or else the BLS signals will have less accuracy than they do now) and there are lots of mechanical issues that need to be thought about (or else this cabling will not fit together). Thank you again for your time on Monday, Dan P.S. I copied this to Hal, Darien, Paul, Maris, Chip and Harry (the managers) to let them know that you and John Anderson are starting Fermi D-Zero electrical support working on this cabling project. They are the contacts for budget information and such.