Date Created: Monday, August 1, 2005 5:47:43 AM CDT Date Saved: Monday, August 1, 2005 6:09:48 AM CDT Category - Topic - sequence number: Trigger/Log - Trigger_Log - 434390 Operator(s): Alan Stone Keyword(s): :TRIGGER: I searched around for an hour this morning for any box of pleated foil cables to no avail. There were none in the DAB3 cabinet. I found two pairs, untested, on the sidewalk. I still need ten more PFCs to complete the mockup for one ADF crate, and of course, I need all of them for testing pretty soon. On Friday, one or more of the engineers removed and resorted the patch panel assemblies. I took a few minutes to reorder the patch panel cards. I found three patch panel assemblies with six tested PPCs attached in DAB3, presumably to check or fix the screw hole positions. I noticed that someone had managed to get the patch panels attached to the racks with screws from left and right side. However, I had to struggle to open two hinge panels, by pushing up/down, so the hand screw would turn. I put the new faceplate on the 10th ATC. I labelled the box with the remaining v1 ATC faceplates (version 2 of the final production of 100 will have a couple slight modifications). I connected and routed 20 PFCs to the 10 good ATCs on the ADF backplane. A total of 40 PFCs are not needed. I will do the other side once I locate the other PFCs. The strain relief works well, although I might suggest moving the three screw holes an extra 1 mm out, away from the backplane, so there is no rubbing between the strain relief bar and the edge of the cables. There is still an issue with what to do with the PFC slack. Also, right now, there are no side panels between the racks, so I may not have the correct path for the cables which cross from one rack to the other. After doing half of the ADF crate, I realized that for the final installation, we will have to connect the ADF-TAB LVDS cables first. I will include a few photos in my next logbook entry to better illustrate this point. I can still connect and route the LVDS cables since only half of the PFCs are connected, but it would have been easier to start with the LVDS first. I had to temporarily unbolt one of the AC boxes in order to install all of the ATCs. There are two AC boxes (each with two outlets, with a safety interface to the RMI) and both are in unfortunate positions with respect to the ADF backplane. I will ask that they be moved up or down. Date Created: Monday, August 1, 2005 8:35:47 AM CDT Date Saved: Monday, August 1, 2005 8:47:56 AM CDT Category - Topic - sequence number: Trigger/Log - Trigger_Log - 434423 Operator(s): Alan Stone Keyword(s): :TRIGGER: Johnny Green directed me to the location of the PFCs. I have applied 20 temporary labels, and connected the one end to the patch panel cards. Before I route these additional 20 PFCs to the ADF backplane, I first need to deal with the mess/mass of LVDS cables from the ADF to the TAB. I want to consult with John Fogelsong on the matter of the LVDS cables. I have connected 30 LVDS cables to the 10 ATCs, and used the strain relief mechanism. However, the rubber pieces are not very effective in holding the LVDS cables fixed. Also, it became clear with more congestion that one needs to connect the LVDS cables at the ADF-end in a very particular order. From the rear of the racks, if you are on the right of the TAB crate (racks 104 and 106), start with slot 21 and work down to slot 2. If you are on the left of the TAB crate (racks 109 and 111), then start with slot 2 and work up to slot 21. Finally, I do not know what to do with all the slack. I was told to leave the TAB end of the LVDS cables "free", since over the next few weeks, we may want to move the cables around to different slots. The 30 LVDS cables are unlabelled, since they have not been checked locally yet. At the moment, the cables are just hanging which will be a problem if anyone tries to work in the rear of the crate. Date Created: Monday, August 1, 2005 12:02:45 PM CDT Date Saved: Monday, August 1, 2005 12:14:47 PM CDT Category - Topic - sequence number: Trigger/Log - Trigger_Log - 434476 Operator(s): Alan Stone Keyword(s): :TRIGGER: The patch panel assemblies are now in place for the three racks we wanted to mock-up. The associated PPCs and PFCs are connected as well. At the ADF backplace, I disconnected the 20 PFCs because they were in the way of connecting the LVDS cables. However, those PFCs could be easily reconnected in about 3-5 minutes. I showed John Fogelsong the result. We need some additional clamps on the side so all the weight of 20 cables does not rest on an edge. John informed me that the racks would be open on the sides in the final MCH configuration, so the way I routed them was just fine. I showed John the mess of LVDS cables. I have since applied temporary labels: ATC01A, ATC01B, ATC01C...ATC10A, ATC10B, ATC10C. A, B and C correspond to 1st, 2nd and 3rd positions on the ATC from top to bottom. 30 LVDS cables are connected at the ADF side. For now, I have coiled up the rest of the cables, in bundles of three. John and Victor will give some thought on how to store the slack, and how to strain relieve the LVDS cables at the TAB side. Perhaps tomorrow, we can finish the mock-up and then document with photographs.