AES3 / SPDIF input selection

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Hello,

I'm designing a converter from AES3 and SPDIF to I2S. It will be used for measurement/testing.
At the moment I am wondering what is the best solution to do an input selection between AES3, SPDIF coax. and SPDIF opt.
In my design, I use the CS8414 which has differenmtial inputs.
What about relays?
The input of the chip is compatible to RS422. Is there somthing like a RS422-Mux or -Switch that can be used?
Any experiances out there?
It is important that the input selection circuit has low influene to signal performance.

Thank you for help,

Greetings,

Arne
 
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