The v-5000 digital technology, fashionable appearance, standard 19-inch 2U case has three sets of 8p-din sockets for system multi-way connection, each of which can connect 35 sets of meeting units, which can be increased to 250 sets of meeting units through capacity expansion equipment. Three main working states and three sub-working modes can be set. Liquid crystal display working state. The internal feedback recording circuit is provided with three equalization regulation circuits of high, medium and low pitch, as well as recording and output monitoring, auxiliary input function, and helping high gain.