MONTAGE DE REGISTRES ET DE LIGNES AUXILIAIRES ENTRANTES A IMPULSIONS DECADRAN D'APPEL

A common control telephone exchange with a central processor has a pool of dialing registers for connection to calling lines and trunks. Incoming dial pulse trunks without "stop dial" are connected to registers using the regular links and marker. To increase the time for connection, the first dial pulse is detected in the trunk and forwarded as a resistance ground on one conductor via the network. The register has a polar relay to detect this potential, which is also used for party detection or coin detection on other calls. The central processor finds the calling line class of service, and for dial pulse trunks initiates the register so that "1" is added to the first digit, and the interdigital timer is started upon operation of the polar relay, so that even if the first digit is a "1" it is registered properly.