APPARATUS FOR, AND METHOD OF, CONTROLLING TRANSFER OF DATA INTO AND OUT OF A PROGRAMME-CONTROLLED DATA SWITCHING CENTRE

摘要

Data is transferred between transmission lines A11 to A1x, Z11 to Z1x and a switching centre EDS via a monitoring circuit MC1 which is one of a plurality MC1 to MCn utilised for handling respective transmission rates. Each monitoring circuit has a microprocessor CPU controlling emission to the switching centre of message signals MP determined by the signalling data received from the incoming lines Z11 to Z1x. This latter signalling data can be in any one of a plurality of formats X20, X70 but each message signal stored in store RAM corresponds to an item of signalling data in each of the formats. Emission of signalling data to the outgoing lines A11 to A1x is dependent on job commands AP from the switching centre, the monitoring circuit being arranged to emit the data in the appropriate format for the outgoing line. IMAGE