1
Simonelli Richard A: Equalizer with automatic line build-out. Lynch Communication Systems, May 18, 1971: US3578914 (38 worldwide citation)

Automatic line build-out is provided in the equalizer stage of a PCM telephone repeater to correctly and continuously match the repeater automatically to any line length and to varying line parameters. To reduce the power requirements to a minimum, the circuit utilizes the equalized signal itself to ...


2
Alan G Hutcheson, William R Bonham, Calvin H DeCoursey, James H Glaser, Richard D Ross, Wook R Shim: Dual-processor line concentrator switching system. Lynch Communication Systems, Phillips Moore Weissenberger Lempio & Majestic, April 8, 1980: US04197427 (32 worldwide citation)

A switching system is disclosed for the concentration of a plurality of telephone lines onto a lesser plurality of intermediate trunks, wherein an independent processor is included at both ends of the concentrator system. These processors communicate with each other over a randomly chosen idle trunk ...


3
Todd V Townsend, Thomas Streenan: Apparatus for testing subscriber carrier systems. Lynch Communication Systems, Weissenberger and Peterson, January 3, 1984: US04424421 (20 worldwide citation)

A telephone subscriber testing system is disclosed in which all tests may be performed from a central office. A central office test device is connected to the central office by a separate telephone line with a telephone number of its own. Moreover, a dedicated command channel connects the office tes ...


4
Alan G Hutcheson: Maintenance monitor for telephone switching systems. Lynch Communication Systems, Phillips Moore Weissenberger Lempio & Strabala, September 14, 1976: US03980839 (18 worldwide citation)

A data processing system for monitoring a telephone switching system comprises a microprocessor controller, random access and read only memories, and data input and error output means. The data processing system analyzes the received data to determine if the switching system is operating correctly, ...


5
Tracey Robert J, Lombaerde Robert P: Receiver for decoding duobinary signals. Lynch Communication Systems, Phillips Moore Weissenberger Lempio & Strabala, February 4, 1975: US3864529 (13 worldwide citation)

A receiver for converting duobinary signals to binary data is provided with self-correcting gain and DC level controls which are operated by integrated digital correction signals derived from the amplitude of the sample itself. Sample timing control is accomplished by similar integrated correction s ...


6
Calvin H DeCoursey: Method and apparatus for pulse train synchronization in PCM transceivers. Lynch Communication Systems, Weissenberger and Peterson, May 29, 1984: US04451917 (13 worldwide citation)

A method and device for phase synchronization for use particularly where a fixed internal clock signal generator is used for both receive and transmit functions.


7
Paul J Lima, Todd V Townsend: Automatic span line switch. Lynch Communication Systems, Phillips Moore Weissenberger Lempio & Strabala, September 28, 1976: US03983340 (12 worldwide citation)

An automatic span line switch for PCM communication lines is disclosed which isolates alarm conditions to an actual span line failure, as distinguished from failures in the terminal equipment. In addition, the switch uses a specific code transmission to provide fast switching and to permit identific ...


8
Paul J Lima, Todd V Townsend: Method and means for detecting an outgoing failure in a bidirectional communications span and looping the same in response thereto. Lynch Communication Systems, Phillips Moore Weissenberger Lempio & Majestic, August 16, 1977: US04042794 (12 worldwide citation)

An automatic span line switch for PCM communication lines is disclosed which isolates alarm conditions to an actual span line failure, as distinguished from failures in the terminal equipment. In addition, the switch uses a specific code transmission to provide fast switching and to permit identific ...


9
Todd V Townsend: Method and means for powering telephone span lines. Lynch Communication Systems, Phillips Moore Weissenberger Lempio & Majestic, April 1, 1980: US04196320 (9 worldwide citation)

An essentially non-dissipative, strap-free, continuously adjustable power unit inherently impervious to shorts and open circuits for powering repeaters in a T1 or similar telephone span line is disclosed. The unit uses a pulse-width modulated inverter in the converter input circuit to produce a vari ...


10
R Gordon Cook, Todd V Townsend: Telephone system using pulse code modulated subscriber lines. Lynch Communication Systems, Harry G Weissenberger, June 1, 1982: US04333175 (9 worldwide citation)

In an all-digital telephone system for communication between a central office and widely scattered subscriber locations, means are disclosed for carrying digital service from the central office to various distribution locations over T1-type equipment and from the distribution locations to subscriber ...