I would prefer that everybody creates a thread of his own for his particular setup.
This makes it easier to read and support, because then all information in a thread is regarding this one setup. Thanks.

Basically, whether you use WC or any other of the digital channels doesn't change the quality of clock synchronization.

If you should work with different sample rates and often change between single and double (or quad speed), then it is an advantage to use WC or digital ports with only two channels, like AES or SPDIF, because they support sample rates between 44.1 and 192 kHz. Then the clock slaves can automatically follow the clock of the master.

For operational reasons, it is best to use the main recording interface as clock master, the one that is connected to the computer. Then you only need to change the sample rate in the DAW; the recording interface gets the proper sample rate through the driver, and the clock slaves can follow the sample rate of the master.

ADAT and MADI use sample multiplexing to achieve the higher bandwidth that is needed for double and quad speed. But there is nothing in the protocol header that tells them how many ports are being "bundled", whether it is single, double, or quad speed.

If you can set the ADAT port to work with SPDIF protocol on both sides, then you can use optical SPDIF for synchronization as well; it's also a 2-channel protocol that supports 44.1-192 kHz.

See my blog article on clock synchronization:
https://www.tonstudio-forum.de/blog/ent … ios-en-de/

Two good options that keep the ADAT ports free for connecting as many channels of the 802 as possible and that make it easier to use double speed, because with two ADAT ports you would still have 8 ports for routing channels between the UFX II and 802 FS:

A) Using AES for clock synchronization

PC
|
| USB2
|
UFX II [cm]---AES----------------------------->AES IN---802 FS [cs]   only one direction needed
               \                                                               /
               ADAT1 OUT------------------------>ADAT1 IN
               ADAT2 OUT------------------------>ADAT2 IN
               ADAT1 IN<-------------------------ADAT1 OUT
               ADAT2 IN<-------------------------ADAT2 OUT

B) Using WC for clock synchronization

PC
|
| USB2
|
UFX II [cm]....WC OUT...............................>WC IN...802 FS [cs]
              \                                                               /
               ADAT1 OUT------------------------>ADAT1 IN
               ADAT2 OUT------------------------>ADAT2 IN
               ADAT1 IN<-------------------------ADAT1 OUT
               ADAT2 IN<-------------------------ADAT2 OUT

[ cm=clock master, cs=clock slave ]