Gaia
GAIA.ASU.SP.ESM.00007
Issue 2.00
Page 21 of 79
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GAIA.ASU.SP.ESM.00007 (Avionics SCOE Req Iss 2).doc
3.6.2 1553 BUS Interfaces
The Gaia on-board command/control system is based on a MIL-STD-1553B bus architecture.
Communications between the Control & Data Management Unit (CDMU) and the majority of the Service
Module (SVM) units and Payload Module (PLM) units are performed via two (2) MIL-STD-1553B buses:
• a dual-redundant MIL-STD-1553B bus dedicated to the communications with the SVM
• a dual-redundant MIL-STD-1553B bus dedicated to the communications with the PLM
For each bus, the CDMU is the Bus Controller.
AVI-259/CDMU-745,GSE-SYS-409/T
Separate MIL-STD-1553B BUS Interfaces shall be provided to simulate the Spacecraft Service
Module (SVM) and Payload Module (PLM) BUS.
AVI-260/CREATED/T,R
Each 1553 BUS Interface shall provide the following services:
Redundant Bus Operation (BUSA/BUSB)
Remote Terminal (RT) Functions - for up to 31 RTs
Bus Monitor Functions (Bus Spy)
AVI-274/CREATED/T
The 1553 BUS Interface cards shall be configured and controlled by the Avionics SCOE, or by the
RTS for closed-loop Avionics testing.
AVI-275/CREATED/R
The 1553 BUS Interface cards shall be based on COTS or previously developed in-house systems.
AVI-291/CREATED/R
The 1553 BUS Interface cards (specifications, configuration and Remote Terminal addressing) shall
conform to [AD05].
AVI-710/GSE-SYS-399, GSE-SYS-401, CSE-SYS-406, GSE-SYS-407, GSE-SYS-408/T
Data simulation and acquisition shall be provided for each of the following RT:
SVM 1553 Bus PLM 1553 Bus
PCDU A CDU #1
STR #1 PDHU A
TRSP #1 MDE #1
MPE #1 OSE #1
GYRO #1A VPU #1
GYRO #1B VPU #2
GYRO #1C VPU #3
PAA #1A VPU #4
PCDU B VPU #5
STR #2 VPU #6
TRSP #2 VPU #7
MPE #2 CDU #2
GYRO #2A PDHU B
GYRO #2B MDE #2
GYRO #2C OSE #2
PAA #1B
AVI-375/CREATED/T
The Avionics SCOE shall provide decommutation of the 1553 BUS data for parameter acquisition of
each RT.
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