Genband US LLC

Xel Communications, Inc.

Aztek Engineering, Inc.

At+t Corp.

Bell Telephone Laboratories

Joseph Marcus Elder

David Lee Holien

David J Farrell

Peter Gade Ruether

Terry D Bolinger

Donald L Bise

Peter Ruether

An Access Gateway Management System (AGMS) allows telephone operating companies to transition their existing wireline customers over to Voice over the Internet Protocol (VoIP) technology without having to invest in new workflow processes, systems, or maintenance facilities by adapting the Operational Support Systems interfaces currently employed for managing legacy circuit-switched switching systems to manage Line Access Gateways (LAGs), which are the generic line termination systems employed in VoIP infrastructure. The AGMS also configures and adapts metallic loop test systems currently deployed for the purpose of routine maintenance and troubleshooting of subscriber lines terminating directly or indirectly (through access systems) on existing switching systems to continue to provide this functionality when the lines terminate on LAGs. Synchronization of the subtended LAGs is coordinated with the legacy network by the AGMS.

Access gateway management system

A wiring verification system is disclosed for testing the correct pairing of a plurality of subscriber lines between an existing line termination system and a replacement line termination system to assist in the transfer of the subscriber line terminations from the existing line termination system to the replacement system. The wiring verification system comprising a controller and two testheads, one of which places test calls from the line under test to a designated test line that is terminated by the second testhead. The electrical qualities of the wye splices between lines associated with new line termination system and those of the existing line termination system are analyzed for correctness and possible hazardous conditions. The directory number of the line under test can be verified by decoding the calling line ID. Automated test strategies provide details related to which splices require attention and suggestions for remediation.

System for installation testing of telephone line terminations

A switch proxy comprising a controller, a translations database and a switching fabric are connected to a trunk group between a remote terminal and its controlling local switching system. The switch proxy monitors control and alarm signals to and from the switching system on the trunk. In the event of loss of control signals from the host switching system, the switch proxy intercepts requests for service, etc. from a calling telephone connected to the remote terminal and performs a look up in the translation database. If the call can be completed without the controlling switching system the call is looped back to the remote terminal. The translation database is maintained by a switch proxy management system that receives change orders from the local exchange carrier. The switch proxy management system forwards relevant changes to the switch proxy's translation database in the field.

Switch proxy for providing emergency stand-alone service in remote access systems

A switch proxy comprising a controller, a translations database and a switching fabric are connected to a trunk group between a remote terminal and its controlling local switching system. The switch proxy monitors control signals to and from the switching system on the trunk. In the event of loss of control signals from the host switching system, the switch proxy intercepts requests for service, etc. from a calling telephone connected to the remote terminal and performs a look up in the translation database. If the call can be completed without the controlling switching system the call is looped back to the remote terminal. The translation database is maintained by a switch proxy management system that receives change orders from the local exchange carrier. The switch proxy management system forwards relevant changes to the switch proxy's translation database in the field.

Switch proxy for providing emergency stand alone service in remote access systems

A cable television (CATV) system is modified to provide two-way telephone communications in a subsplit band below the video signal, preferrably in the range of approximately 5-40 MHz. Each line amplifier in the coaxial cable network is equipped with a bypass strap or bypass circuitry to maintain a signal path through the line amplifier for the telephone signal in the event of failure of the line amplifier. Due to the decreased attentuation resulting from its lower frequency, the telephone signal can typically travel the distance of three or four line amplifier spacings without amplification. Line amplifier failure is a common occurrence in CATV networks. Therefore, the present invention greatly increases the reliability of telephone communications over CATV networks.

CATV telephony system using subsplit band for both directions of

By opening switches coupling a subscriber loop to circuits in a SLIC when an overvoltage condition occurs, the SLIC is protected from damage. The overvoltage is detected by a overvoltage protector behind the switches. The overvoltage condition is latched and the common control is notified of the condition. The common control may then clear the latch, reclosing the switches. If the overvoltage still exists, the switches are re-opened and maintenance personnel is notified of the fault.

Overvoltage protection scheme for subscriber loops and method of

A method of providimg two-way communication between a plurality of channel units in a channel bank and a line interface circuit of a telephone system utilizing a receive direction protocol and a separate transmit direction protocol. The receive direction protocol identifies the channel unit to which provisioning data is to be delivered, increases the bandwidth of the voice data region in the time slot corresponding to the identified channel unit, superposes the provisioning data in the time slot with the voice data, and delivers the superposed data to the channel unit wherein the provisioning data is separated from the voice data. The transmit direction protocol utilizes the A and B signaling bits corresponding to the eighth bit of an identified time slot in the sixth and twelfth transmit frames wherein two bits of an eight bit status message is delivered on every other superframe. The two-way communication protocols occur without affecting or interfering with the PCM voice data.

Intra channel bank communication protocols between channels and the line

This specification discloses a time division communication system having a plurality of line circuits for coupling telephones over bidirectional lines to outgoing and incoming time division buses. Each of the line circuits comprises an active hybrid having separate transmit and receive operational amplifiers for connecting the outgoing and incoming buses to a telephone line via interface circuitry and during selected time slots of a time division frame. The interface circuitry comprises transformer and capacitor arrangements for coupling a bidirectional telephone line via a filter to an input of the hybrid transmit amplifier and an output of the receive amplifier. The filter together with a phase lead compensation network, a negative feedback resistor and a resistor-capacitor bias arrangement cooperate to control hybrid balance, stability and frequency response.

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Boulder, CO, United States of America

Joseph Marcus Elder