APM-40 is a fast and reliable solution for establishing a comprehensive telephone network in emergencies. All you need is a pair of copper/steel wires and several APM-40 telephone terminals. Each APM-40 terminal represents a simple building block of the network. Terminals are stringed along a pair of wires in the total distance of over 7 km. APM is a fully decentralized system. Each APM-40 telephone terminal has embedded PBX and MUX functionality, which means you can gradually build a network of 2-40 telephones without a centralized unit. The network allows making 7 duplex voice conversations at the same time over one pair of wires. It also allows conference calls and many PBX functionalities. The APM-40 is powered by standard everywhere-available AA batteries or locally (by solar panels, external batteries), which ensures total independence from the electricity network. Furthermore, it is possible to make connections (via gateway unit APM-40/I) to other APM networks, the PSTN network or the PBXs and to radio links. All these features make APM comprehensive, easy-to-install and easy-to-use means for establishing a communication network in exceptional circumstances.