ABSTRACT

The loop signaling equipment was designed to take care of all the different types of signaling on the CTT network. In the PCM structure, time slot 16 is used to convey all the signaling information of the 30 channels. The PCM transmission equipment gives to any signaling channel the possibility of using 4 bits each 2 ms interval. While all the inputs are first "filtered" by the data collecting board, the unit that is responsible for the performance and the different features of the equipment interfaces directly with the PCM link and the exchange interfaces to send all the outcome signals from the processing. The loop signaling equipment, due to the use of microprocessors, can be a great help in the improvement of the actual network and also to ease the transition for the digital network.