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DMC 205 CCSDS (Channel Access Data Unit (CADU) (Complete frame, Created…
DMC 205 CCSDS
Channel Access Data Unit
(CADU)
Complete frame
Created at the modem (Ku comm unit)
Includes headers, Reed-Solomon forward error correction, and sync
This is what causes overhead.
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Objectives
Describe CCSDS format
Describe CADU format
Identify data types for commands and telemetry
Explain Ku overhead
Definitions
Consultative Committee for Space Data Systems
Standard satellite data packet format
Headers
Primary
Type bit (1 for PL, 0 for systems)
APID
Secondary
Time stamp
Time ID
Real-time authenticated
Real-time non time authenticated
Time tagged
Packetization
Ku-band only sends CCSDS packets
KCU packetizes IP encap, audio, video
APS packetizes bitstream data
Types
IP encap
DTN
HD video
JSL
Ku-IP services
Bitstream
CCSDS packets
Video
Audio