To give a little background, for what it's worth, AES3 is a balanced 110 Ohm simplex (one-way) system. It expects a 110 Ohm source impedance driving a transmission line of 110 Ohm characteristic impedance that is terminated in a receiver that presents a 110 Ohm load. The edge rates are modest by modern digital communication standards and AES3 is quite tolerant of imperfect conditions. As a result AES3 may be split among any number of daisy-chained receivers (within reason) so long as each but the last has a high, say > 10 kOhm, input impedance. The last in the chain, of course, needs to terminate the line in 110 Ohms, to avoid reflections. I've seen gear (don't remember where) that lets you lift the terminators on the AES inputs to do just such daisy-chaining.
Also, for what it's worth, attached is the circuit for a little AES3 distribution box that I built. It's been running continuously for about 7 years with no problems. Its input is configured for coaxial S/PDIF (the consumer unbalanced standard) but it could easily be reconfigured for proper AES3.
Best,
--Frank