Subscriber line-trunk circuit

Details Subscriber line-trunk circuit Subscriber line-trunk circuit

H - Electricity

04

B

379/58, 379/64,

H04B 3/20 (2006.01) H04B 3/23 (2006.01) H04M 3/00 (2006.01)

Patent

CA 1096522

R. Treiber -1 SUBSCRIBER LINE TRUNK/CIRCUIT Abstract of the Disclosure A microprocessor controlled subscriber line circuit for interfacing analog telephone lines and trunks to a digital switching system is disclosed. All processing of incoming analog signals is accomplished by the line circuit, including the interface between the line and a digital switching matrix, measuring, monitoring, testing of the signals associated with the speech path, generating talking battery, ringing and other tones, equalization and providing the two-wire to four-wire conversion with acceptable echo performance and minimized cross-office transmission loss. The analog-to-digital and digital-to-analog conversions are accomplished under microprocessor control as are the tone and power generation functions in a programmable power supply configuration utilizing pulse duration modulated feedback control in a programmable signal generator. The described subscriber circuit is particularly advantageous- in that it is designed to maximize its implementation using solid state circuit techniques and LSI devices as opposed to conventional audio components and relays.

297983

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