If you want to build something, ITU-T G.703 + G.8271 (both available for free) outline how this works for telco equipment. There's a low-speed serial channel alongside the PPS / 10MHz signals, carrying the actual wallclock time. It's transported over RS422 on a RJ45 connector for PPS + side channel, SMA (or other coaxial connector) for 10MHz reference. Some devices also accept plain NMEA stanzas as input to read the clock from.
(I always thought RS422 for the PPS signal is a bit fishy, not sure how jitter-y those transceivers are. That said the hardware I've seen uses >25Mbaud high-speed transceivers [ISL3180, THVD1452], maybe those are fine in that regard.)
A modern 5G base station kinda does what you describe. All SDR these days anyway :)
(I always thought RS422 for the PPS signal is a bit fishy, not sure how jitter-y those transceivers are. That said the hardware I've seen uses >25Mbaud high-speed transceivers [ISL3180, THVD1452], maybe those are fine in that regard.)
A modern 5G base station kinda does what you describe. All SDR these days anyway :)