1
Myron C Butler, Christopher Madore: Telephone technicians terminals with auto-selection of dial pulse on DTMF signalling. Communications Technology Corporation, Laney Dougherty Hessin & Beavers, May 1, 1990: US04922516 (82 worldwide citation)

An improved craft technician's field terminal of the portable, hand-held type for use in communicating in diverse modes with a central technician access network. The terminal is connected to the telephone line in conventional manner in communication with the telephone access network; however, the te ...


2
Yasuji Yano: Power feeding system using two-wire subscriber lines. NEC Corporation, Ostrolenk Faber Gerb & Soffen, June 12, 2001: US06246748 (74 worldwide citation)

A power feeding system includes a line state detector for detecting an operation state of each of a pair of 2-wire subscriber lines connected to the exchange equipment and a transformer for supplying the DC power to the subscriber terminal through each of the pair of 2-wire subscriber lines connecte ...


3
Michael E Burke, Samuel Colodner, Huy T Luu, Steven P Saneski: Drop testing in fiber to the home systems. American Telephone & Telegraph Co, October 1, 1991: US05054050 (65 worldwide citation)

Disclosed is a means for testing drop wires in digital loop systems which employ optical fiber up to a distant terminal near the subscriber's premises. A test module is provided at the distant terminal to determine the presence or absence of faults on the wires to the customer premises. The results ...


4
John H Garthwaite, Clay A Stocklin, David M Rollins: Portable telecommunications test instrument with line condition monitoring. Leviton Manufacturing Co, Seed and Berry, October 20, 1992: US05157708 (43 worldwide citation)

A handheld battery-powered telecommunications test instrument for monitoring the status of a pair of wires. A tone-generating circuit generates a tone signal in response to the user manually selecting operation in a tone-generating mode. The instrument monitors the pair of wires to determine whether ...


5
Francisco I Palomeque, Jose M Cepria: Public modular-telephone management system. Telefonica de Espana, Mason Fenwick & Lawrence, August 11, 1992: US05138648 (39 worldwide citation)

A public modular telephone management system. By using several units and systems, as well as ancillary elements for managing public modular telephones, it is possible to provide the public modular telephones with means of making payment for the service by using several types of cards such as: credit ...


6
Derek G Foster, Edward K W Siu, Ben A Pierce, Michael Kennedy, Onofrio Schillaci, Alex Knight: Remote measurement unit containing integrated line measurement and conditioning functionality for performing remotely commanded testing and conditioning of telephone line circuits. Harris Corporation, Charles E Wands, March 25, 1997: US05615225 (33 worldwide citation)

A processor-controlled integrated telephone line measurement and conditioning apparatus installable at a remote site provides a multiplicity of measurement and conditioning functions that are selectively executable in response to commands issued from a supervisory command site. The dual measurement ...


7
Yuzuru Ishioka: Testing system for local subscribers. Fujitsu, Welsh & Katz, March 16, 1993: US05195124 (32 worldwide citation)

A test system for local subscriber lines, which is used with a telephone communication system having a central office exchange, local subscribers accommodated by the central office exchange, and intervening units, i.e., a central office terminal, a subscriber side remote terminal, and a transmission ...


8
John A Hammond, James W Edwards, Andre Lubarsky Jr: Subscriber loop tester for telephone switching systems. Tektronix, William K Bucher, May 4, 1993: US05208846 (22 worldwide citation)

A subscriber loop tester for testing local loops of telephone switching networks has a partitioned "U" interface and an internal bus architecture for converting various transceiver circuit output data formats to a common data format. The "U" interface has a high impedance transformer meeting bandwid ...


9
Mitsuru Ishikawa: Subscriber call simulator capable of testing new services of a telephone switching system. NEC Corporation, Sughrue Mion Zinn Macpeak & Seas, November 12, 1991: US05065422 (21 worldwide citation)

Connected to a telephone switching system through subscriber lines, a subscriber call simulator acts as a plurality of pseudo-subscriber's telephone sets. An input/output section inputs control procedure information for the pseudo-subscriber's telephone sets. Connected to the input/output section, a ...


10
Clifford L Hall, Norman R Harris, Stephen T Killian, Jeffrey B Wells: Performance monitoring of DSO channel via D4 channel bank. Adtran, Charles E Wands, August 26, 1997: US05661778 (20 worldwide citation)

Non-intrusive performance monitoring of a DS0 channel between a customer premises interface and a D4 channel bank includes an augmentation of existing channel bank equipment and a digital services communication device terminating the DS0 link at the customer site. An auxiliary signalling and perform ...