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This schematic of the Voyager telecom system shows that the FDS sends data to the comm system over 2 serial interfaces - a low rate 10 b/s interface routed to the S-band transmitter and a variable rate 10 - 115.2 kb/s interface whose bits are sent via X or S band.

Also, from the 2 diagrams (this post and post #1), the outer coding (Reed-Solomon) is done in software!

What do you think might cause the data to be stuck not at 0 or 1 but at 0101?

https://descanso.jpl.nasa.gov/DPSummary/Descanso4--Voyager_new.pdf
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