Pre-CCSDS Standards Craft in Service
There are a few pre-CCSDS standards craft in active service
- Voyager 1
- Voyager 2
this only means they do not transmit in the modern standard CCSDS packet formats. These craft do however use CCSDS standardized error correction formats in the downlink segment.
With respect to physical transmission layer the Voyager craft use standard DSN turnaround sequential ranging modulation. The spacecraft transponder has the capability to demodulate the uplink ranging data and remodulate it on the S-band or X-band downlink (or both downlink carriers simultaneously). The CCSDS baseline ranging standard is based on the Voyager craft ranging method.
Read more about this topic: Consultative Committee For Space Data Systems
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