Thomas Earl Bullington

US Patent:

57683689, Jun 16, 1998

Filed:

Jan 10, 1997

Appl. No.:

8/781487

Inventors:

Roger L. Koenig - Boulder CO
Thomas Bullington - Boulder CO
Phillip Clark - Boulder CO

International Classification:

H04M 300

US Classification:

379418

Abstract:

A technique for powering telephone lines using an unbalance current source and current sink; and a technique for improving attenuation/frequency distribution and return loss (impedance matching) of transformer-coupled wire-line communications circuits by using secondary series capacitance and an AC current pump signal source; and a generation of ringing voltage as positive voltage pulses with respect to a negative power supply voltage; and a technique for removal of AC power ripple by using an active linear floating filter for the purpose of powering telephone line circuits, and a technique for injection of real time tone samples into T1 transmissions circuits by use of a T1 framer idle code register. The combination of the above five circuit techniques provides for the hardware implementation of a single printed circuit board embodiment (Line Interface Unit LIU) of a plurality of communications functions including a T1 channel service unit, a ringing generator, power converters, a ringback tone generator, and a channel bank controller. The LIU supports selectable T1 standards of communications.

US Patent:

58704663, Feb 9, 1999

Filed:

Jan 10, 1997

Appl. No.:

8/781486

Inventors:

Roger L. Koenig - Boulder CO
Thomas Bullington - Boulder CO
Phillip Clark - Boulder CO

Assignee:

Carrier Access Corporation - Boulder CO

International Classification:

H04M 1100
H04J 314

US Classification:

379399

Abstract:

A technique for powering telephone lines using an unbalance current source and current sink; and a technique for improving attenuation/frequency distribution and return loss (impedance matching) of transformer-coupled wire-line communications circuits by using secondary series capacitance and an AC current pump signal source; and a generation of ringing voltage as positive voltage pulses with respect to a negative power supply voltage; and a technique for removal of AC power ripple by using an active linear floating filter for the purpose of powering telephone line circuits, and a technique for injection of real time tone samples into T1 transmissions circuits by use of a T1 framer idle code register. The combination of the above five circuit techniques provides for the hardware implementation of a single printed circuit board embodiment (Line Interface Unit LIU) of a plurality of communications functions including a T1 channel service unit, a ringing generator, power converters, a ringback tone generator, and a channel bank controller. The LIU supports selectable T1 standards of communications.

US Patent:

62755102, Aug 14, 2001

Filed:

Nov 24, 1999

Appl. No.:

9/449190

Inventors:

Roger L. Koenig - Boulder CO
S. Christopher Alaimo - Boulder CO
Thomas E. Bullington - Boulder CO
Phillip D. Clark - Boulder CO
Kenneth C. Grobaski - Berthoud CO
Matthew D. Morris - Boulder CO
Kirkton I. Shoop - Longmont CO
Michael A. Trofi - Boulder CO

Assignee:

Carrier Access Corporation - Boulder CO

International Classification:

H04J 304

US Classification:

370535

Abstract:

A multiplexer for multiplexing and demultiplexing signals between a low-speed network and a higher speed network includes 7 quad DSX-1 cards and 1 spare card. The spare card is connected to the DSX-1 cards to allow the spare card to automatically be switched in for one of the DSX-1 cards or to allow interface electronics on the spare card to replace selected ones of interface electronics on different DSX-1 cards simultaneously. A pair of controller cards, a primary card and a secondary card, perform M1-3 multiplexing and demultiplexing and the DS-3 framing and transceiving. The controller cards can be selected or deselected in a short time period alarms are not set off and so that the transition is hitless by electronically enabling and disabling the transceiver. The multiplexer is connectable to 2 different T-3 links to provide network redundancy. An array of relays connected either controller card to either of the T-3 links.

US Patent:

59701390, Oct 19, 1999

Filed:

Jan 10, 1997

Appl. No.:

8/781270

Inventors:

Roger L. Koenig - Bouler CO
Thomas Bullington - Boulder CO
Phillip Clark - Boulder CO

Assignee:

Carrier Access Corporation - Boulder CO

International Classification:

H04M 176
G05F 112

US Classification:

379413

Abstract:

A technique for powering telephone lines using an unbalance current source and current sink; and a technique for improving attenuation/frequency distribution and return loss (impedance matching) of transformer-coupled wire-line communications circuits by using secondary series capacitance and an AC current pump signal source; and a generation of ringing voltage as positive voltage pulses with respect to a negative power supply voltage; and a technique for removal of AC power ripple by using an active linear floating filter for the purpose of powering telephone line circuits, and a technique for injection of real time tone samples into T1 transmissions circuits by use of a T1 framer idle code register. The combination of the above five circuit techniques provides for the hardware implementation of a single printed circuit board embodiment (Line Interface Unit LIU) of a plurality of communications functions including a T1 channel service unit, a ringing generator, power converters, a ringback tone generator, and a channel bank controller. The LIU supports selectable T1 standards of communications.

US Patent:

61447366, Nov 7, 2000

Filed:

Jul 1, 1999

Appl. No.:

9/346406

Inventors:

Roger L. Koenig - Boulder CO
Thomas Bullington - Boulder CO
Phillip Clark - Boulder CO

Assignee:

Carrier Access Corporation - Boulder CO

International Classification:

H04M 100

US Classification:

379399

Abstract:

A technique for powering telephone lines using an unbalance current source and current sink; and a technique for improving attenuation/frequency distribution and return loss (impedance matching) of transformer-coupled wire-line communications circuits by using secondary series capacitance and an AC current pump signal source; and a generation of ringing voltage as positive voltage pulses with respect to a negative power supply voltage; and a technique for removal of AC power ripple by using an active linear floating filter for the purpose of powering telephone line circuits, and a technique for injection of real time tone samples into T1 transmissions circuits by use of a T1 framer idle code register. The combination of the above five circuit techniques provides for the hardware implementation of a single printed circuit board embodiment (Line Interface Unit LIU) of a plurality of communications functions including a T1 channel service unit, a ringing generator, power converters, a ringback tone generator, and a channel bank controller. The LIU supports selectable T1 standards of communications.

US Patent:

58811486, Mar 9, 1999

Filed:

Mar 26, 1998

Appl. No.:

/048691

Inventors:

Roger L. Koenig - Boulder CO
Thomas Bullington - Boulder CO
Phillip Clark - Boulder CO

Assignee:

Carrier Access Corporation - Boulder CO

International Classification:

H04M 1900
G05F 140

US Classification:

379399

Abstract:

A technique for powering telephone lines using an unbalanced current source and current sink; and a technique for improving attenuation/frequency distribution and return loss (impedance matching) of transformer-coupled wire-line communications circuits by using secondary series capacitance and an AC current pump signal source; and a generation of ringing voltage as positive voltage pulses with respect to a negative power supply voltage; and a technique for removal of AC power ripple by using an active linear floating filter for the purpose of powering telephone line circuits, and a technique for injection of real time tone samples into T1 transmissions circuits by use of a T1 framer idle code register. The combination of the above five circuit techniques provides for the hardware implementation of a single printed circuit board embodiment (Line Interface Unit LIU) of a plurality of communications functions including a T1 channel service unit, a ringing generator, power converters, a ringback tone generator, and a channel bank controller. The LIU supports selectable T1 standards of communications.

US Patent:

57402418, Apr 14, 1998

Filed:

May 12, 1995

Appl. No.:

8/440099

Inventors:

Roger L. Koenig - Boulder CO
Thomas Bullington - Boulder CO
Phillip Clark - Boulder CO

Assignee:

Carrier Access Corporation - Boulder CO

International Classification:

H04M 1900
G05F 140

US Classification:

379399

Abstract:

A technique for powering telephone lines using an unbalance current source and current sink; and a technique for improving attenuation/frequency distribution and return loss (impedance matching) of transformer-coupled wire-line communications circuits by using secondary series capacitance and an AC current pump signal source; and a generation of ringing voltage as positive voltage pulses with respect to a negative power supply voltage; and a technique for removal of AC power ripple by using an active linear floating filter for the purpose of powering telephone line circuits, and a technique for injection of real time tone samples into T1 transmissions circuits by use of a T1 framer idle code register. The combination of the above five circuit techniques provides for the hardware implementation of a single printed circuit board embodiment (Line interface Unit LIU) of a plurality of communications functions including a T1 channel service unit, a ringing generator, power converters, a ringback tone generator, and a channel bank controller. The LIU supports selectable T1 standards of communications.

US Patent:

59913126, Nov 23, 1999

Filed:

Nov 3, 1997

Appl. No.:

8/962757

Inventors:

Roger L. Koenig - Boulder CO
S. Christopher Alaimo - Boulder CO
Thomas E. Bullington - Boulder CO
Phillip D. Clark - Boulder CO
Kenneth C. Grobaski - Berthoud CO
Matthew D. Morris - Boulder CO
Kirkton I. Shoop - Longmont CO
Michael A. Trofi - Boulder CO

Assignee:

Carrier Access Corporation - Boulder CO

International Classification:

H04J 304

US Classification:

370535

Abstract:

A multiplexer device for multiplexing and demultiplexing signals between a low-speed network including 28 DSX-1 signals and a relatively higher speed network including a DS-3 signal. The multiplexer device includes 7 quad DSX-1 cards and 1 spare card. The spare card is connected to the other 7 DSX-1 cards in a fashion that allows the spare card to automatically be switched in for one of the DSX-1 cards or to allow interface electronics on the spare card to replace selected ones of the interface electronics on various different DSX-1 cards simultaneously. A pair of controller cards, a primary card and a secondary card, perform the M1-3 multiplexing and demultiplexing and the DS-3 framing and transceiving. The controller cards can be selected or deselected by distributed logic in a sufficiently short time period so that alarms are not set off and so that the transition is hitless. This is accomplished by electronically enabling and disabling the transceiver.