1. GLAST LAT ProjectEnv Test Planning,15 March 2005 LAT System Engineering 1 LAT Thermal Vac EGSE Cabling

2. GLAST LAT ProjectEnv Test Planning,15 March 2005 LAT System Engineering 2 TVAC Electrical Layout Drawing

3. GLAST LAT ProjectEnv Test Planning,15 March 2005 LAT System Engineering 3 SIIS Harness Wire Count (1/2) PP # - Conn #Conn #DescriptionPower (wires)LVDS (wires)Analog(wires)1553 1-1Prim_P2JL-1, 119, 12732 1-2Red_P2JL-2, 120, 12932 1-3Prim_P3JL-1, 119, 14032 1-4Red_P3JL-2, 120, 14232 1-5Prim_P1JL-143, 14616 1-6Red_P1JL-136, 14916 2-1Prim_A_P5JL-121 14 4-1Prim_A_P4JL-125 26 3-1Red_A_P5JL-122 14 5-1Red_A_P4JL-138 26 2-2Prim_B_P5JL-121 14 4-2Prim_B_P4JL-124 26 3-2Red_B_P5JL-122 14 5-2Red_B_P4JL-145 26 4-3GBM_J1JL-124, 125, 138, 145 16

4. GLAST LAT ProjectEnv Test Planning,15 March 2005 LAT System Engineering 4 SIIS Harness Wire Count (2/2) PP # - Conn #Conn #DescriptionPower (wires)LVDS (wires)Analog(wires)1553 2-3???Prim_A_P12JL-232, 233 1 3-3???Prim_B_P12JL-234, 235 1 2-4Prim_P6JL-1, 2, 152 32 3-4Red_P6JL-1, 2, 153 32 2-5Prim_P7JL-121, 123, 124 32 3-5Red_P7JL-122, 123, 138 32 4-4Prim_P8JL-238, 124, 125, 127, 129 30 5-3Red_P8JL-238, 138, 145, 127, 129 30 2-6Prim_P9JL-131, 140 30 3-6Red_P9JL-131, 141 30 2-7Prim_P10JL-142, 144 30 3-7Red_P10JL-142, 145 30 4-5Prim_P11JL-239, 152 30 4-6Red_P11JL-239, 152 30 TOTAL1601763682

5. GLAST LAT ProjectEnv Test Planning,15 March 2005 LAT System Engineering 5 Test Signal Wire Count PP # - Conn #Conn #LVDS (wires)Analog(wires) Test Port 5-4, 5-5, 5-6JL-6980 5-7JL-3934 Total 114 Thermistors 6-1, 6-2, 6-3Flyaway 74 6-4Removable 8 Total 82 TBD GSE Heater TBD TC's (Sensor Count) # of Sensors 6-5, 6-6, 6-7Flyaway 54 7-1thru 7-6, 7-7Removable 110 7-7, 8-1, 8-2, 8-3MGSE 61 Total Sensors 225

6. GLAST LAT ProjectEnv Test Planning,15 March 2005 LAT System Engineering 6 Total Counts Power (wires)LVDS (wires)Analog(wires)1553 TC's (Sensors) TOTALS 160 (minus GSE Heaters)2904504225

7. GLAST LAT ProjectEnv Test Planning,15 March 2005 LAT System Engineering 7 Near Term Issues/Work Need to order long lead items such as TVac connectors –GSE Heaters Heater requirements are quickly being developed –1553 Port plate configuration SIIS harness will not reach all the necessary port plates –Investigate modifying harness by “breaking out” cables further from main harness. Not obvious from drawings if this is possible. When SIIS harness is delivered (March 21),an evaluation can be made. – Other possibility is to build extension cables. Not desirable since it adds more interfaces. –Harness routing Bend radius Strain relief Not using SIIS Cable implementation of 1553. –Consolidates prime and redundant via 1553 couplers –VSC needs all four 1553 penetrations through port plates

8. GLAST LAT ProjectEnv Test Planning,15 March 2005 LAT System Engineering 8 Near Term Issues/Work Facility Drawing –Port plate location relative to LAT Used to determine cable lengths inside chamber –Locate EGSE outside chamber Used to determine cable lengths outside chamber Facility power capability for EGSE Thermocouples How the thermocouples will be grouped on the LAT end is TBD. Wirelist –Work is just starting Minor issue with flyaway thermistor count –One to many sensors to fit all on 2 connectors –Need to balance need for thermistor and cable complexity