Specifications

Gaia
GAIA.ASU.SP.ESM.00007
Issue 2.00
Page 13 of 79
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GAIA.ASU.SP.ESM.00007 (Avionics SCOE Req Iss 2).doc
AVI-3115/CREATED/A
As a minimum, it shall be possible to run a Test Session on the Avionics SCOE for a period of 5 days,
without loss of synchronisation or data.
AVI-4234/CREATED/T
It shall be possible to run a test session on the Avionics SCOE within 1 minute after boot of the
Avionics SCOE Controller.
Note: This requirement does take account of any warm-up time which may be needed for the SCOE
hardware equipments.
3.3 Avionics SCOE Grounding Requirements
AVI-1580/CREATED/R
The Avionics SCOE shall provide galvanic isolation between the Spacecraft Interfaces and the SCOE
chassis/safety ground.
This may be achieved by a number of methods, including:
• Provision of isolated Power Supplies to the various Spacecraft Interface electronics.
• Choice of Spacecraft Interface circuits which are inherently isolated (relay contacts,
optocouplers, etc.)
3.4 Avionics SCOE Test Modes
AVI-1589/GSE-SYS-391/T
The Avionics SCOE shall provide 3 Test Modes:
• Local Test Mode.
• Remote Test Mode.
• Closed-Loop Test Mode.
AVI-1590/CREATED/T
In Local Test Mode, data output to the Spacecraft Interfaces shall be determined initially by
configuration file and updated by the operator under control of the local MMI. Data inputs from the
Spacecraft Interfaces shall be acquired, archived locally and made available to the local MMI.
AVI-1591/GSE-SYS-392/T
In Remote Test Mode, data output to the Spacecraft Interfaces shall be determined initially by
configuration file and can be updated by the CCS (Test Procedures). Data inputs from the Spacecraft
Interfaces shall be acquired, made available to the local MMI and transferred to the CCS (Test
Procedures).
AVI-1592/GSE-SYS-393/T
In Closed-Loop Test Mode, specific data output to the Spacecraft Interfaces shall be determined by
the Real Time Simulator (RTS) and specific data inputs from the Spacecraft Interfaces transferred to
the RTS.
AVI-3378/GSE-SYS-393/T
It shall be possible to operate in Closed-Loop Test Mode either locally, under control of the MMI, or
remotely, under control of the CCS (as determined by the LOCAL/REMOTE state of the Avionics
SCOE - see Section 3.9).