ADASE (Long-range automatic communication equipment for power systems) is a specialized telephone communication system designed specifically for dispatch services of electric power networks. ADASE is also a special type of telephone interface and its signaling protocol.
Uses a 4-wire analogue tone line, no signaling circuits. The signaling of the interaction between the ADASE equipment is transmitted within the band of the speech channel. For it, the frequencies of 1200 Hz and 1600 Hz are assigned plus / minus 5 Hz. It is possible to simultaneously connect the telephone set (with dialing) and the dispatcher console to one ADASE channel. At the same time, the dispatch channel has an advantage over the telephone.
ADASE is mainly used in RF communications equipment ; non-switched tonal frequency channels can be used in multiplexer systems . To work with the ADACE interface, special dispatcher consoles, telephones (or adapters for connecting telephones with the FXO / FXS interface) are required. The ADACE interface is supported by the majority of automatic telephone exchanges (UPATS) and dispatch controllers manufactured in the CIS, as well as by many imported automatic telephone exchanges supplied to the CIS market.
Due to the fact that the system was developed before the advent of digital exchanges , it uses an analog transmission system. Therefore, the inclusion of PM telephone channels (tone frequency) in digital telephone exchanges should be carried out using specialized four-wire trunk lines without a signal wire operating in the ADACE code and necessarily included in the equipment of digital telephone exchanges.
At the moment, ADACE technology is still widely used in telephony at electric power facilities, such as substations and power plants, to ensure the operation of dispatch communication channels. This is due to the simplicity of implementation in a four-wire circuit (some modern exchanges support ADASE), noise immunity (unlike simple FXO / FXS) and a small channel width when transmitting via digital communication channels.
Typical schemes for constructing telephone channels using the ADACE code are given here. [one]