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"Transmission of documents via telephone wires is possible in principle, but the apparatus required is so expensive that it will never become a practical proposition."
Dennis Gabor, British physicist
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| Number | Title | Issue Date |
| 7333593 | Digital loop carrier module for proactive maintenance application Methods and systems for proactively maintaining Digital Loop Carriers and a telephone system local loop. One embodiment for proactively maintaining a Digital Loop Carrier in a telephone system local loop includes communicating with a communications network and acqui... | 02/19/2008 |
| 7050547 | Digital loop carrier module for proactive maintenance application Methods and systems for proactively maintaining Digital Loop Carriers and a telephone system local loop. One embodiment for proactively maintaining a Digital Loop Carrier in a telephone system local loop includes communicating with a communications network and acqui... | 05/23/2006 |
| 7020249 | Voice interface unit for line conditioner control Interfacing to and controlling POTS line conditioning devices using a Voice Interface Unit (VIU) are described. Technicians perform tests and checks while a POTS line is in a conditioned state. The VIU provides a centralized voice input/voice output interface allowi... | 03/28/2006 |
| 6633628 | Apparatus and method for selecting a supported signal path for a transceiver A method and apparatus for selecting a supported signal path for a transceiver in a communication system is provided. An exemplary embodiment of the apparatus includes a relay for selecting a first test signal path from a first signal path and a second si... | 10/14/2003 |
| 6404855 | Conditioner unit for pair gain test controller A conditioner unit is wired in parallel with a pair gain test controller used to test a digital loop carrier telephone network. The conditioner unit senses a signal intended to request test results from the pair gain test controller and provides a respons... | 06/11/2002 |
| 5946374 | Pair gain test unit for use in a combined telephony/video co-axial cable termination unit A test system for performing pair gain tests within a co-axial cable termination unit of a combined telephony/video system is described. The combined telephony/video system provides a set of telephony channels and video channels to the co-axial cable term... | 08/31/1999 |
| 5940374 | Mechanism for determining whether channel unit is installed in D4 channel bank slot A D4 channel bank data bus monitoring scheme automatically determines if a channel unit connector slot is occupied, without having to gain physical access to the interior of the channel bank cabinet and inspect the channel bank's backplane slot positions.... | 08/17/1999 |
| 5848127 | Two-wire channel unit with loopback test capability A two-wire channel unit or line card for use in a digital loop carrier (DLC) telephone system is disclosed. The channel unit is provided with a loopback test capability by using relays to open-circuit or short-circuit the input terminals of the hybrid cir... | 12/08/1998 |
| 5615225 | Remote measurement unit containing integrated line measurement and conditioning functionality for performing remotely commanded testing and conditioning of telephone line circuits 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 su... | 03/25/1997 |
| 5574769 | Inductive amplifier having automatic gain control for butt set An inductive amplifier for identifying and tracing wires includes an automatic gain control feature for sensing the connection of butt set leads to the inductive amplifier and reducing the gain of the inductive amplifier in such instances to reduce the li... | 11/12/1996 |
| 5550894 | Device for sequentially altering a communication line for remote diagnostic checks A network termination unit for connection to a telephone line at a predetermined demarcation point thereof for sequentially simulating a plurality of fault conditions to allow a diagnostic routine to be performed on the telephone line at a remote location... | 08/27/1996 |
| 5121424 | Telephone system and speech level adjusting method therefor In a telephone system 1 connectable to both integrated service digital network (ISDN) lines 3a and 3b and a public subscriber telephone network (PSTN) line 7 and having a plurality of extension telephone sets 11a to 11d, the speech sound volume through th... | 06/09/1992 |
| 5103473 | Telephone system communication mechanism employing central office sleeve lead A data communication and sleeve lead control apparatus provides auxilary signalling between a no-test trunk control unit, and another unit such as a pair gain unit which is coupled with the link between the control unit and the no-test trunk, while mainta... | 04/07/1992 |
| 5081670 | Smart data station termination (DST) without active equalizers A smart data station termination ("DST") uses a method for remote alignment in which the switched access remote test system ("SARTS") sends a test tone of a single, predetermined frequency and power level to the receive-in port of the DST. The DST amplifi... | 01/14/1992 |
| 4270030 | Testing of subscriber loop pair gain systems A testing system is disclosed for telephone subscriber loops which are in part derived by multiplex facilities in what have come to be known as pair gain systems. In this testing arrangement, the local drop wires from the remote terminal of the pair gain ... | 05/26/1981 |
