One of the transmission facilities of a TASI system is used as an order wire, via which channel signalling information and assignment information are transmitted. Signalling information is transmitted periodically in frames on the order wire for only some of the channels, connected to the system, at...http://www.google.fr/patents/US4627049?utm_source=gb-gplus-shareBrevet US4627049 - TASI system including an order wire
