2 AVM-3901-B, -C, -B4, and -C4 Installation and Operation ManualChapter 1: IntroductionProduct DescriptionAVM-3901-B, -C, -B4, and -C4 modules are multiplexer/synchronizersdesigned for standard definition video.AVM-3901-B and -C modules support two AES audio inputs and twoAES processed outputs in balanced (AVM-3901-B) and unbalanced(AVM-3901-C) formats. AVM-3901-B4 and -C4 modules support fourAES inputs in balanced (AVM-3901-B4) and unbalanced(AVM-3901-C4) formats.All versions provide an SDI video input and two SDI video outputs forvideo containing embedded audio, as well as an internal video framesynchronizer and a genlock input with loopback.Table 1-1. Descriptions of the AVM-3901-B, -C, -B4, and -C4 ModulesInput Output AVM-3901VersionDigital video SDI 525/625 Digital video SDI 525/625 with multiplexedaudioAVM-3901-BTwo-channel AES digital audio (110Ω) Two-channel AES processed audio (110Ω)Digital video SDI 525/625 Digital video SDI 525/625 with multiplexedaudioAVM-3901-CTwo-channel AES digital audio (75Ω) Two-channel AES processed audio (75Ω)Digital video SDI 525/625 Digital video SDI 525/625 with multiplexedaudioAVM-3901-B4Four-channel AES digital audio (110Ω)Digital video SDI 525/625 Digital video SDI 525/625 with multiplexedaudioAVM-3901-C4Four-channel AES digital audio (75Ω)