Abstract: A method of electronically marking a plurality of branch circuits of an electrical installation of an engineering structure, the plurality of branch circuits comprising a first branch circuit and a second branch circuit, includes: providing one or more signalling devices, wherein at least one of the signalling devices is communicatively coupled to the first branch circuit, and wherein at least one of the signalling devices is communicatively coupled to the second branch circuit; providing, by the at least one signalling device communicatively coupled to the first branch circuit, a first identification signal on the first branch circuit; and providing, by the at least one signalling device communicatively coupled to the second branch circuit, a second identification signal on the second branch circuit, wherein the second identification signal is different from the first identification signal.

Abstract: A method of establishing a communication between at least two communication units in a digital communication system, wherein a first communication unit operates on a long delay link and a second communication unit operates on a short delay link, wherein transmission of audio data blocks is delayed on the short delay link's site.