MATCHING DEVICE FOR ANALOG SUBSCRIBER FOR PROVIDING CID SERVICE

摘要

PURPOSE: A matching device for an analog subscriber for providing a CID(Calling Identity Delivery) service is provided to offer the CID service to the analog subscriber who uses an analog telephone for a CID. CONSTITUTION: A frame forming unit(103) receives a digital line signal from a digital subscriber board of a private exchange and extracts a caller ID. An FSK(Frequency Shift Keying) signal generating and transmitting unit(109) receives the extracted caller ID, generates an FSK signal corresponding to the received caller ID, and transmits the FSK signal according to a predetermined data transmission rule. The digital line signal including the caller ID transmitted from the digital subscriber board is coded by a BPRZ-AMI(Bipolar Return-To-Zero-Alternate Mark Inversion) type and is transmitted at a predetermined transmission speed.