Communications network and a network terminal

A power line communication network, comprising: a plurality of network terminals and at least one power line, wherein each terminal is coupled to said at least one power line such that the terminals are interconnected. Each terminal comprises: a power line interface; at least one processor and at least one memory; a plurality of resources that include at least one signal input and/or signal output; wherein at least one of said terminals has computer code that includes an operating system for controlling the power line communication network, the operating system including: a control layer for controlling access to the processor, memory and resources of each terminal; a virtual machine interface through which virtual machines can access said resources; and a virtual machine manager for controlling access to said resources, wherein said virtual machine manager accesses said resources through the control layer.