[robryk]

GP doesn't want to store the data on the satellite, but rather use the space in-between as a Friday line storage. The satellite would be a repeater that retransmits what it receives. If it was 20 light minutes away, there would be 40 minutes worth of data in transit, so the whole system could store 40 minutes long circular buffer.

[qz2]

Might be a bit lossy :)

[MayeulC]

Right, so you have to send CRCs as well.

The nice thing about this scheme is that you don't technically need to send an active repeater: the mirrors on the moon could already serve this purpose.

At the end of the day, it's a tradeoff between the cost of extra storage, the sequential aspect of data retrieval from a delay line, and its energy cost.