Yamaha DME32 DME32 Owners Manual - Page 239

234 Chapter 13-Wordclocks Terminating BNC Wordclock Distribution For correct and reliable operation, wordclock signals distributed via BNC cables must be terminated correctly. Termination is typically applied at the last device, although it depends on the distribution method being used. The DME32's WORD CLOCK 75Ω ON/OFF switch allows the DME32 to be connected in a variety of ways. The following examples show three ways in which wordclock signals can be distributed and how termination should be applied in each case. Star Distribution In this example, a dedicated wordclock distribution box is used to supply a wordclock signal to each device individually. Termination is applied at each device. Wordclock master WC OUT (BNC) Wordclock distribution box WC IN (BNC) Device-A Termination = ON Wordclock slave WC IN (BNC) Device-B Termination = ON Wordclock slave WC IN (BNC) Device-C Termination = ON Wordclock slave WC IN (BNC) Device-D Termination = ON Wordclock slave Bus Distribution In this example, the wordclock signal is distributed via a common bus. Termination is applied at the last device only. Wordclock master WC OUT (BNC) WC IN (BNC) Device-A Termination = OFF Wordclock slave WC IN (BNC) Device-B Termination = OFF Wordclock slave WC IN (BNC) Device-C Termination = OFF Wordclock slave WC IN (BNC) Device-D Termination = ON Wordclock slave Daisy Chain Distribution In this example, the wordclock signal is distributed in a "daisy-chain" fashion, with each device feeding the wordclock signal on to the next. Termination is applied at the last device only. This method of distribution is not recommended for larger systems. Wordclock master WC OUT (BNC) WC IN (BNC) WC OUT (BNC) Device-A Termination = OFF Wordclock slave WC IN (BNC) WC OUT (BNC) Device-B Termination = OFF Wordclock slave WC IN (BNC) Device-C Termination = ON Wordclock slave DME32-Owner's Manual