<> <> <> <<>> Christophe Cuenod Xerox PARC 3333 Coyote Hill Road Palo-Alto CA 94304 Phone: (415) 494 4415. Clock.wirewrap - Board size :13.5" by 12.5" - 6 layers multilayer board (4 signal layers and 2 power planes). - Signal layers are in 1/2 once copper. - Power planes are in 1 once copper. - FR4 laminate - Board thickness will be 105 mils + or - 10 mils (This is important). - Minimum geometry: 6 mils traces . 6 mils spaces. Smallest hole diameter 16 mils finished (21 mils drilled). Minimum annular ring in trace layers 5 mils over drilling size (31 mils pads for 21 mils drilled). Minimum annular ring in power layers 11 mils over drilling size (43 mils pads for 21 mils drilled). Maximum holes aspect ratio 5 (105/21). - Dry film soldermask on top and on bottom. - Silkscreen on top. - 424 golden fingers (100u Ni, 10u Au) - 5 holes diameters. All holes plated trough. Tolerance +/- 3 mils finished size. Total 2697 holes. 16 mils finished size. 424 holes. 25 mils finished size. 41 holes. 35 mils finished size. 382 holes. 40 mils finished size. 1840 holes. 144 mils finished size. 10 holes. - Board Routing. The dimensions around the connectors are mesured with respect to the copper targets. - Others documents: 1 mechanical drawing. 1 silkscreen film. 1 soldermask film. 6 layer films. 1 drill tape and info to read it.