The development of the LONTALK communication protocol and the NEURONCHIP communication processor made it possible for Echelon to enable a peer-to-peer communication between the network devices, without the required installation of the master systems. Since the original Echelon devices are significantly simpler in their structure and function than the numerical protection relays, the study presents the mode and the tested usage possibilities of this kind of access within the integrated protection and control systems, with the scope of achieving a better functionality of the protection system, the accuracy and the speed of operation nonwithstanding the significant decrease in the need for the classic mode of the wiring between the protection devices. The tests were done by means of ABB devices, REF 543 feeder terminals, RER111 star coupler and RER103 bus connection modules; the above mentioned being the primary parts of the system. A special emphasis was given to the configuration (programming) mode of the feeder terminals, building of the virtual connections between the output network variables of one and the input network variables of the other terminal, as well as to the comparison of the reaction time, i.e. the time necessary for the realization of the wanted sequence, between the classic fixed wiring and communication. After the introduction, the second part of the study presents the basic structure of the LONTALK communication protocol, explains the mode of addressing network devices and forming of the logical structures comprising the network, and it specifies the modes of network access and the constraints regarding the total number of the devices. The third part of the study talks about the other parts of the system, including the feeder terminal relay configuration and relay setting mode and tools, the device network management mode and tools, as well as the network analyzer. The fourth part of the study deals with the configuration files of the characteristic bays of the 35/10 kV trasformer station with the protection, communication, control, supervision and measurement programs already installed. The configurations represent a possible solution for the stations of this type. A complete project of the connections between the feeder terminals was also created. The fifth part relates to the system characteristics taking into consideration the reaction time. Comparison measurements of the classic wiring time and communication were made, the example being a circuit breaker failure protection sequence. The final considerations of the study specify the advantages, the problems and the recommendations for the usage of such devices.