Keyboard video mouse (KVM) switch between plurality of internal USB hubs each associated with plurality of audio codecs connected to the downstream port of associated USB hub

摘要

An improved KVM switch is provided which enables computers to be connected to the KVM switch by reduced numbers of cables. It also supports transmission of digital audio signals between the computers and the KVM switch. A single USB port is provided to transmit keyboard, mouse, speaker and microphone signals between the KVM switch and each computer. The improved KVM switch is provided with one or more USB hubs to separate the keyboard/mouse signals and the digital audio signals, and one or more audio codecs to convert the audio signals from a digital form to an analog form and vice versa.