LA Audio CLK - G4 - Manual (Page 9)

SPD-S4 (S/PDIF splitter):
Why use an S/PDIF splitter:
Because of the high frequency content of an S/PDIF digital signal,
the connection between a transmitter and receiver needs to be
that of a transmission line. This means the cable must have a
characteristic impedance equal to the output impedance of the
transmitter and the input impedance of the receiver to avoid
reflections in the line. So, one cannot connect an S/PDIF output
to several S/PDIF inputs without changing the impedance of the
line and creating reflections.
The SPD-S4 solves this problem with its ability to drive up to 7
different devices (4 coaxial and 3 optical).
Using the SPD-S4:
The SPD-S4 can convert an electrical coax signal into an optical
signal or vice versa.
For S/PDIF a coaxial 75 ohm cable must be used.
For S/PDIF optical a good quality fibre optic cable is
recommended.
SPD-S4 block diagram.
7
Optical in
Coax in
Optical
Coax
Receiver
High speed
Optical output
High speed
Driver
4
3
Clock out
2
1