PRESONUS DigiMax FS User Manual page 9

APPLICATIONS
SMUX
SMUX, a newer generation of optical light pipe technology, supports sample rates up to 96k
and utilizes two optical cables for channels 1-4 and 5-8, respectively.
A set up where you are utilizing eight DigiMax FS preamplifiers and converting to digital
optical output at 96K sample rate, connect two optical cables (preferably the same length
and brand) from the SMUX outputs on the DigiMax FS (channels 1-4 and 5-8) to SMUX
inputs on your digital audio workstation or digital mixer. Press the ADAT sync button on the
front panel of the DigiMax FS and set your digital audio workstation to sync via optical or
SMUX.
To synchronize the DigiMax FS via SMUX (dual light pipe) to another device such as a
digital mixer, you will need to run two optical cables (preferably of the same length and
brand) from the device with the SMUX clock source to the optical inputs 1 and 2 of your
DigiMax FS. From the front panel, select ADAT for your external clock source. The
DigiMax FS will sync to the word clock within the optical signal coming into it's optical inputs.
To sync another device from the DigiMax FS via SMUX, simply run two optical cables
(preferably of the same length and brand) from the DigiMax FS to the device you wish to
connect and set the other device to receive External Clock from it's SMUX dual light pipe
inputs. You can do this whether the Digimax FS is set as a word clock master or slave.
In the rare situation where SMUX channels 1-4 and 5-8 are coming in from separate
devices, it will be important to make sure that all three devices have proper word clock
synchronization. The DigiMax FS will read word clock from the first of it's two optical inputs
or from it's BNC input, or will generate word clock internally, depending on how it is set. It is
therefore important for the second SMUX source coming into the DigiMax FS to share the
same clock source as the first SMUX source to avoid any word clock problems. This can be
done several ways. One way is to sync second SMUX source device to the first SMUX
source device via BNC, which will give them both the same identical word clock; and the
Digimax FS can be set to external ADAT. Another way is to sync the second SMUX source
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