LA Audio CLK - G4 - Manual (Page 11)

CLK-D4 (clock distributor):
Why use a clock distributor:
Because of the high frequency content of a Word Clock signal
(even higher with Super Clock), 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 a Clock output to several Clock inputs without
changing the impedance of the line and creating reflections.
The CLK-D4 solves this problem with its ability to drive up to four
different devices.
Using the CLK-D4:
A cable with a characteristic impedance of 75 ohms must be
used, particularly with long distances and Super-Clock mode (any
video cable with BNC connectors). The CLK-D4, has a very high
input sensitivity and is able to receive a Word Clock and even
Super-Clock signal via a 100 metre cable and so can be used as
a buffer for long distances.
CLK-D4 block diagram
9
Input
High speed
Receiver
1
4
3
2
High speed
Driver
Clock out