Patents Represented by Attorney, Agent or Law Firm Lester H. Birnbaum
  • Method of forming optical fiber connectors
    Patent number: 5513294
    Abstract: An improved method is provided for applying optical fiber support members (17, 18) to a pair of fixtures such as vacuum chucks (24, 25) such that the fixtures can thereafter be used to clamp the support members to opposite sides of an array of optical fibers (14). The improvement comprises arranging the optical fiber support members in a magazine (29, 30) and bringing the two fixtures into proximity with a magazine. Automatic apparatus (33, 34) is used for urging a pair of optical fiber support members from the magazine onto the two fixtures such that the support members adhere to the fixtures. After placement of the support members on the fibers, the cycle is repeated.
    Type: Grant
    Filed: December 8, 1994
    Date of Patent: April 30, 1996
    Assignee: AT&T Corp.
    Inventors: Richard A. Roll, Muhammed A. Shahid
  • Optical fiber management apparatus
    Patent number: 5506926
    Abstract: Disclosed is an apparatus for holding optical fibers which are optically connected to a row of devices such as circuit packs. The apparatus includes a tray adapted for mounting in close proximity to the row of devices. A wire-formed element is mounted in a front portion of the tray. The element includes a series of tabs with spaces therebetween where any fiber can be brought out of the tray for connection to any of the devices.
    Type: Grant
    Filed: October 6, 1994
    Date of Patent: April 9, 1996
    Assignee: AT&T Corp.
    Inventor: David J. Pongracz
  • Method for testing solder mask material
    Patent number: 5501777
    Abstract: Disclosed is a method for testing solder mask material for suitability with an electroless plating process. The Emix potential of the electroless bath is measured. A test substrate including the mask material is then immersed in an electrolyte, and a constant potential at least equal to the Emix potential is applied to a pair of electrodes also immersed in the electrolyte. The test substrate is then inspected to determine adherence of the mask material.
    Type: Grant
    Filed: December 30, 1994
    Date of Patent: March 26, 1996
    Assignee: AT&T Corp.
    Inventors: Donald Dinella, Sudarshan Lal, Kim L. Morton, David A. Nicol
  • Address management for remote terminals in digital loop transmission systems
    Patent number: 5502438
    Abstract: Disclosed is a method and apparatus for identifying remote terminals which are networked in a digital loop transmission system. A Site Interface Unit (SIU) at one of the remote terminals acts as a master. The Bank Controller Unit (BCU) at each remote terminal calculates a 16-bit number based on its 60-byte serial number. A binary search is then performed by the SIU to determine the calculated number of each BCU, and an address is assigned to each remote terminal by the SIU. Any conflicts in the numbers initially calculated are resolved by transmission of the full 60-byte serial number.
    Type: Grant
    Filed: April 20, 1993
    Date of Patent: March 26, 1996
    Assignee: AT&T Corp.
    Inventors: John H. Blevin, Robert W. DeMarco, Peter A. A. Dempsey, Raphael Jimenez, Roger H. Levy
  • Fast AGC for TDMA radio systems
    Patent number: 5493712
    Abstract: Disclosed is a circuit for automatic gain control (AGC) of random access channels (RACH) and traffic channels in a radio system. The amplitude of the input signal is detected at an intermediate frequency (IF) stage, digitized, and coupled to a digital signal processor (DSP) which produces an AGC signal for reducing the gain of the input when the input crosses a threshold value. For RACH bursts, the AGC signal tracks the input signal when it crosses the threshold and the AGC signal remains at a constant value for the the remainder of the time slot unless and until the input increases a threshold amount over its previous highest value. For traffic channels, the DSP will use the AGC signal from the RACH burst as an initial value and change the AGC signal only if the detected input is outside a predetermined range.
    Type: Grant
    Filed: March 23, 1994
    Date of Patent: February 20, 1996
    Assignee: AT&T Corp.
    Inventors: Nallepilli S. Ramesh, Krishnamurthy Sreenath
  • Slidably mounted optical fiber distribution tray
    Patent number: 5490229
    Abstract: Disclosed is an optical fiber distribution apparatus with slide-out trays including optical connectors and splice trays mounted thereon. Each tray has a hinged protective cover and a front portion which drops down to provide access to the connectors. The splice tray is mounted on a platform elevated from the tray so that fibers coming into the tray can be stored in the gap formed thereby.
    Type: Grant
    Filed: September 27, 1994
    Date of Patent: February 6, 1996
    Assignee: AT&T IPM Corp.
    Inventors: Shahryar Ghandeharizadeh, Randy A. Reagan
  • Integrated protector and modular jack
    Patent number: 5487675
    Abstract: Disclosed is a network interface unit where the protectors are mounted within a pouch attached to an RJ11 modular jack. The modular jack includes a contact member which electrically contacts a grounding strip on the terminal chassis to provide the necessary ground connection for the protector.
    Type: Grant
    Filed: September 26, 1994
    Date of Patent: January 30, 1996
    Assignee: AT&T Corp.
    Inventor: Bassel Hage Daoud
  • Message-oriented bank controller interface
    Patent number: 5479582
    Abstract: Disclosed is a message oriented interface for communication between a bank controller unit and peripheral devices, such as channel units, in digital loop transmission systems. At least four registers are used for each peripheral device. Two registers are utilized to transmit control signals, and two registers are for data transmission. An additional data register can hold the last byte read by the bank controller unit in the event of an error so the byte can be re-read. The last byte of each message, which is utilized for error detection, is the exclusive OR function of the corresponding bits in all the previous bytes of the message. A service request can be asserted by a peripheral device to the Bank Controller Unit when a control signal is present in one of the registers. Means are also provided for indicating when a register is busy.
    Type: Grant
    Filed: November 6, 1992
    Date of Patent: December 26, 1995
    Assignee: AT&T Corp.
    Inventors: Lane J. Abrams, Inars Gruntals, Hoo-Yin Khoe, Kevin Loughran
  • Electronic device interconnection techniques
    Patent number: 5477933
    Abstract: An electronic device (11) has on one surface a first ball grid array (12) having a first area. The first ball grid array is bonded to a first intermediate interconnection member (13) having on an opposite surface a second ball grid array having the same number of solder balls (23) as the first array, but of a significantly larger area than that of the first array. Each of the solder balls (23) of the second ball grid array is connected by a connection comprising a conductive via ( 18, 19) extending through the first interconnection member (13) to one of the solder balls of the first ball grid array.
    Type: Grant
    Filed: October 24, 1994
    Date of Patent: December 26, 1995
    Assignee: AT&T Corp.
    Inventor: Hung N. Nguyen
  • Electronic equipment cabinet with improved door
    Patent number: 5476316
    Abstract: A cabinet housing electronic equipment which utilizes a door mounted to hydraulic lifts and a door stay to keep the door from closing if the lifts fail. Special troughs are also provided to protect craftspeople during a rainstorm and to keep water from electronic equipment and areas where it might cause the door to freeze shut.
    Type: Grant
    Filed: December 28, 1993
    Date of Patent: December 19, 1995
    Assignee: AT&T Corp.
    Inventors: Stephen J. Batroney, Harry R. Stoller, Brian E. Underwood
  • Connector block
    Patent number: 5476388
    Abstract: Disclosed is an electrical connector which includes a modular jack and 110-type connecting block. The connector may be installed directly to a 110-type index strip.
    Type: Grant
    Filed: June 23, 1994
    Date of Patent: December 19, 1995
    Assignee: AT&T Corp.
    Inventor: John A. Rutkowski
  • Regeneration of spent electroless copper plating solution
    Patent number: 5472585
    Abstract: Disclosed is a method for removal of contaminants and replenishment of an electroless copper plating solution in order to allow reuse of the solution. Copper oxide is dissolved in the spent solution and this is followed by an electrodialysis which removes formate and carbonate ions.
    Type: Grant
    Filed: November 30, 1994
    Date of Patent: December 5, 1995
    Assignee: AT&T Corp.
    Inventors: Donald Dinella, Sudarshan Lal, David A. Nicol
  • Electronics cabinet with reduced absorption of solar radiation
    Patent number: 5469328
    Abstract: Disclosed is an electronics cabinet with a compartment for storing batteries and having heat shields for reducing heat buildup in the compartment. The heat shields are attached to each door of the compartment with an air gap therebetween so that absorbed solar heat can be removed by natural convection.
    Type: Grant
    Filed: March 2, 1994
    Date of Patent: November 21, 1995
    Assignee: AT&T Corp.
    Inventor: Stephen J. Palaszewski
  • Optical fiber distribution frame with fiber testing
    Patent number: 5461693
    Abstract: Disclosed is an optical fiber distribution frame which provides means for testing the patch connections. Optoelectronic circuits are inserted into each module and are optically connected to the incoming optical fiber cable. The circuit includes a light source for launching a test signal into the patch fiber, a detector for monitoring a test signal from the patch fiber, and a microprocessor for controlling the launching and for monitoring the received signals.
    Type: Grant
    Filed: July 14, 1994
    Date of Patent: October 24, 1995
    Assignee: AT&T IPM Corp.
    Inventor: Richard J. Pimpinella
  • Telecommunications distribution frame with tracing
    Patent number: 5448675
    Abstract: Disclosed is a distribution unit which provides means for tracing patch connections. Each module is electrically connected to a shelf controller through a backplane. The shelf controllers are, in turn, coupled to a host computer. Pressing a button on one module lights an LED on that module and on the module which should be connected thereto based on the data base in the host computer.
    Type: Grant
    Filed: June 9, 1994
    Date of Patent: September 5, 1995
    Assignee: AT&T IPM Corp.
    Inventors: Frank S. Leone, Richard J. Pimpinella
  • Device including a maintenance termination unit and protector
    Patent number: 5442519
    Abstract: Disclosed is a device and method of manufacture which provides a maintenance termination unit (MTU) and surge protector in a single 5-pin package. The components for both the MTU and surge protector are formed on a single printed circuit board separated by a groove but electrically connected by a plurality of wires. After wave soldering the contacts on the board, the board is broken apart while maintaining the electrical connection, and the resulting structure is mounted in a 5-pin package.
    Type: Grant
    Filed: December 29, 1993
    Date of Patent: August 15, 1995
    Assignee: AT&T Corp.
    Inventors: George A. DeBalko, Rajendra S. Rana
  • DSX jack
    Patent number: 5439395
    Abstract: Disclosed is a jack panel module for use in telecommunications equipment. Each module includes a plurality of stand-alone jack assemblies with an integral electrical connection from the front of the panel to a series of rear terminals. Each panel assembly includes input and output plug-receiving sleeves which are staggered with respect to adjacent assemblies to provide sufficient room for standard sized plugs.
    Type: Grant
    Filed: August 30, 1993
    Date of Patent: August 8, 1995
    Assignee: AT&T Corp.
    Inventor: Daniel A. Laukzemis
  • Frequency hopping in digital cellular networks
    Patent number: 5430713
    Abstract: A circuit is for providing frequency hopping in a Time Division Multiple Access (TDMA) system. A microprocessor determines the frequency to be transmitted in a particular broadcast frame. A dual port random access member (RAM) provides an interface between the microprocessor and a time division multiplex bus so that the time slots are mapped to addresses in the memory. A plurality of transceivers coupled to the bus transmits and receives at different designated frequencies, the transceivers being chosen for particular users during a particular broadcast frame based on the location in the memory chosen by the microprocessor.
    Type: Grant
    Filed: May 6, 1994
    Date of Patent: July 4, 1995
    Assignee: AT&T Corp.
    Inventors: Pavan K. Gupta, Mozammil Hussain, Desmond A. Lee, Haim S. Ner
  • Circuit for broadband video transmission over unshielded twisted wire pairs
    Patent number: 5420551
    Abstract: Disclosed is a circuit which permits transmission of broadband analog CATV video signals on unshielded twisted wire pairs. The circuit includes an autotransformer with a ground connection coupled to the node between two secondary windings. The two opposite ends of the secondary windings are coupled to a choke, which, in turn, is coupled to an isolation transformer with a center-tapped primary and secondary winding for shunting any remaining common-mode currents.
    Type: Grant
    Filed: June 29, 1994
    Date of Patent: May 30, 1995
    Assignee: AT&T Corp.
    Inventors: Robert A. Conte, William H. Georger
  • Emergency local switching
    Patent number: 5418776
    Abstract: Disclosed is an apparatus and method for providing transmission between end users coupled to a digital loop carder access system. During normal operation, the access system functions to transmit data and supervisory signals between each end user and a local digital switch. In the event of a failure in the coupling between the access system and switch, the access system provides transmission paths between each end user and designated users such as emergency services which am coupled to the same access system.
    Type: Grant
    Filed: February 26, 1993
    Date of Patent: May 23, 1995
    Assignee: AT&T Corp.
    Inventors: Robert C. Purkey, Steven P. Spencer, James K. Wheeler