Word Clock Over Coax Cable
Professional digital audio equipment may have a word clock input or output to synchronize timing between multiple devices. And although the electrical characteristics of the word clock signal have not been completely standardized some characteristics should always apply. Things that should remain consistent are a 75ohm output impedance, 75ohm cables and a 75ohm terminating resistor at the end of a chain or cable.
Proper termination of the word clock signal with a 75ohm resistor is important. It prevents the clock signal from reflecting back into the cable and causing false detection of extra 1's and 0's. Some digital equipment include a switchable terminator, some include a hardwired terminator and others have no terminator at all. The unfortunate part is that some equipment manuals do not indicate whether a hardwired terminator is included or not.
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