TELEMETRY ACCESS ARRANGEMENT

摘要

The present invention relates to a method and apparatus of accessing a customer premises device from a data accessing device via a telecommunications switching system. The telecommunications switching system is comprised of a voice band signal switching network for switchably interconnecting multiplicities of inlets and multiplicities of outlets. The inlets are for connection to interoffice telecommunications trunks. The outlets are for connection to analog customer lines. The method is comprised ofdetermining that a class of service for an inlet connected to the data accessing device is a class of service requiring establishment of a suppressed ringing connection; establishing a suppressed ringing connection from the inlet to an outlet of the voice band switching network for connecting the data accessing device to an analog customer line connected to station equipment of a customer and transmitting signals over the suppressed ringing connection for accessing the customer premises device over the analog line from the data accessing device. In the method, the establishing step comprises determining whether the station equipment is connected via a subscriber loop carrier, and, if so, sending a brief spurt of ringing signal over the connection for enabling the subscriber loop carrier to establish a connection to the station equipment without transmitting a substantial ringing signal to the station equipment.