The ICEU VME Card Specifications:

· Simulates all the digital interfaces of the ICM S-Band Transponder (SBT or Transponder)
· All simulated Transponder interfaces are optp isolated from VME ground
· VMEbus interface for forward link data, 4096 words of buffering
· Automatically inserts 32-bits of minimum idle data between commands
· Programmable idle data, all 1's, all 0's, or alternating 1's and 0's
· VMEbus inferface for correlated return link data, 32 frames of buffering
· Return link data is appended with time tag and CRC is checked
· VMEbus interface for Transponder Mode/Frequency command reception
· VMEbus interface for Transponder Status generation
· Provides interface between JSC test facilities and ISC flight equivalent units
· Provides forward link data to TURFTS (Digital NRZ-M)
· Provides forward link data to TURFTS (Analoge BPSK)
· Receives return link data from TURFTS
· Generates LC EPOCH signals
· Drives forward link data and receives return link data over the umbilical cable during launch support
· Interfaces to the ELSE Bus Protection Unit (ELSE-BPU), during launch support
· Interfaces to the ELSE Ordinance Reset VME Card, during launch support