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XEL Communications, Inc. Patents
Assignee:
XEL Communications, Inc.
Address:
Aurora, CO
No. of patents:
12
Patents:












Patent Number Title Of Patent Date Issued
5606725 Broadband network having an upstream power transmission level that is dynamically adjusted as a February 25, 1997
A broadband network, such as a cable television (CATV) system, for two-way digital communications between a headend and a number of remote terminals dynamically adjusts the power of the upstream signal transmitted by each remote terminal to maintain the bit error rate (BER) of the upstre
5513173 Data link access unit for T1 spans supporting the extended superframe format (ESF) April 30, 1996
A data link access unit for insertion into a T1 span supporting the extended superframe (ESF) format includes an interface for accessing the frames of digital data carried by the T1 span in ESF format (including the data link bits) and calculating performance monitoring data for the T1
5488413 CATV telephony system using subsplit band for both directions of transmission January 30, 1996
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
5408524 Answer supervision over pulse code modulated carrier system and method therefore April 18, 1995
A system for supervising a telephone connection using over a pulse code modulated carrier network between a first customer's equipment and a second customer's equipment. A first channel unit is located in a channel bank serving the first customer's telephone equipment. A second channel
5301187 System for implementing broadband audio program telephony circuits using 2B1Q technology April 5, 1994
A two-way broadband audio telephone communications system using 2B1Q line coding between a program amplifier located at a remote site and the central office. The program amplifier includes a codec to convert analog audio signals to digital data at a predetermined sampling rate, and a 2B1
5247574 Adaptive no balance DX signalling circuit September 21, 1993
The no balance duplex signalling circuit eliminates the need for setting balance resistors and capacitors to match or be proportional to cable resistance and capacitance as was required of previous duplex signalling circuit designs. A microcomputer is also used to evaluate the output of
5197068 Intra channel bank communication protocols between channels and the line interface unit of a tel March 23, 1993
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 u
5151935 Programmable universal signaling circuit for a telephone network September 29, 1992
A programmable universal signaling circuit for use in a universal channeling unit of a telephone network. The programmable universal signaling circuit uses a line converter and decoder circuit which under control of a microprocessor generates a unique set of configuration signals for
5140625 System for testing 2B1Q telephony loopback circuits and method therefor August 18, 1992
A system for testing 2B1Q private line data telephony circuits having 2B1Q modulation between the network channel termination equipment and the channel unit. 2B1Q modulation is provided over a single pair of wires connected to the E and M leads of the channel unit. The system can deliver
5131033 Sealing current generator for a telephone circuit July 14, 1992
A sealing current generator for a telephone circuit provides a conventional nominal DC bias current in a telephone loop, and also temporarily provides a higher "zap" current whenever the DC current path is broken and then reapplied to the telephone loop. During the "zap" period, the volt
5081670 Smart data station termination (DST) without active equalizers January 14, 1992
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 amplifies this test tone by a fixed
5034978 Universal channel unit switchable between two wire and four wire configurations July 23, 1991
The universal channel unit includes a channel interface circuit that uses a pair of fixed ratio transformers to terminate both two wire and four wire analog transmission facilities on a selectable basis. The universal channel unit also includes a plurality of signalling circuits, each of

 
 
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