MacSystem is a system of multichannel-multiplexer devices, which enables the simultaneous transmission of 4 to 12 voice channels through a single, twisted copper pair. Analogue channels (POTS), as well as digital (ISDN) uncompressed ones, may be conducted over the same pair. That is how pair-gain devices enable improved efficiency of the network, as more voice and data channels may be simultaneously transmitted over the same wire. The transmitting process is based on HDSL transmission technology. Additionally, we also ensure the remote power supply for all devices on the subscribers’ side, which increases the autonomy of the solution. The devices on the central (COT) side are set up as built-in units, while the devices on the subscribers’ side may be installed in different types of housings for indoor and outdoor application. Control and configuration are carried out by own Monitoring System, which uses the SNMP protocol and can be easily integrated in all higher level control systems.