Yamaha D24 Owner's Manual - Page 151

150 Chapter 13-Multiple D24s & Video Sync Terminating BNC Video Sync Distribution When a video sync signal is distributed via BNC cables, it must be terminated correctly. Normally, termination is applied at the last device connected, although it depends on the distribution method being used. The D24's VIDEO 75Ω ON/OFF switch allows the D24 to be connected in a variety of ways. The following examples show three ways in which a video sync signal can be distributed and how termination should be applied. Video Sync Distribution Box In this example, a dedicated video sync distribution box is used to supply a video sync signal to each device individually. Termination is applied on each device. Video sync master VIDEO OUT (BNC) Video sync distribution box VIDEO IN (BNC) VIDEO IN (BNC) VIDEO IN (BNC) VIDEO IN (BNC) Device-A Device-B Device-C Device-D Termination = ON Video sync slave Termination = ON Video sync slave Termination = ON Video sync slave Termination = ON Video sync slave Bus Distribution In this example, the video sync signal is distributed via a common bus. Termination is applied at the last device only. Video sync master VIDEO OUT (BNC) VIDEO IN (BNC) VIDEO IN (BNC) VIDEO IN (BNC) VIDEO IN (BNC) Device-A Device-B Device-C Device-D Termination = ON Video sync slave Termination = ON Video sync slave Termination = ON Video sync slave Termination = ON Video sync slave Daisy Chain Distribution In this example, the video sync signal is distributed in a daisy-chain fashion, with each device feeding the video sync signal on to the next device. Termination is applied at the last device only. This method of distribution is not recommended for larger systems. Video sync master VIDEO OUT (BNC) VIDEO IN VIDEO OUT (BNC) (BNC) Device-A Termination = OFF Video sync slave VIDEO IN VIDEO OUT (BNC) (BNC) Device-B Termination = OFF Video sync slave VIDEO IN (BNC) Device-C Termination = ON Video sync slave D24-Owner's Manual