Method and system for providing DC power on local telephone lines

• US 20070127715A1
• Filed: 12/18/2006
• Published: 06/07/2007
• Est. Priority Date: 01/30/2003
• Status: Active Grant

• Current Assignee: Taiwan Semiconductor Manufacturing Company Limited
• Original Assignee: SercoNet Limited (Yehuda Binder, MBA)
• Inventors: Hazani, Ami, Binder, Yehuda, Kofman, Semion
• Granted Patent: US 8,787,562 B2
• Time in Patent Office: Days
• US Class Current: 379/413.40
• CPC Class Codes: H04M 19/08 with current supply sources at the substations generating ringing current H04M19/04
• CPC Class Codes: H04M 9/08 Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic

Abstract

A telephone unit device connectable in series between a telephone set and a wire pair coupled to a telephone service and carrying DC power and an AC telephone signal. The device includes: a first connector connectable to the wire pair; a second connector connectable to the telephone set; means connected between the first and second connectors for passing substantially without change the AC telephone signal between the wire pair and the telephone set; and means connected between the first and second connectors for receiving DC power only from the wire pair and converting the DC power to a level suitable for proper telephone operation of the telephone set connected thereto.

Claims

1. A telephone unit device connectable in series between a telephone set and a wire pair coupled to a telephone service and carrying DC power and an AC telephone signal, said device comprising:

a first connector connectable to the wire pair;

a second connector connectable to the telephone set;

means connected between said first and second connectors for passing substantially without change the AC telephone signal between the wire pair and the telephone set; and

means connected between said first and second connectors for receiving DC power only from the wire pair and converting the DC power to a level suitable for proper telephone operation of the telephone set connected thereto.

2. The device of claim 1 integrated into one of:

a telephone set; and

a telephone outlet.

3. An outlet comprising the telephone unit device of claim 1.

4. The device of claim 1 in combination with:

off-hook detector means couplable to the telephone set for detecting an off-hook condition of the telephone set;

off-hook transmitter means coupled to said off-hook detector means and to the wire pair for supplying an off-hook indication to the wire pair in response to detection of an off-hook condition by said off-hook detector means.

5. The device of claim 4, wherein the off-hook indication is a signal composed of one or more tones.

6. The device of claim 4, wherein said off-hook indication is provided by a variable impedance that assumes a selected value to produce the off-hook indication.

7. The device of claim 4, wherein the off-hook indication is a message sent over a data communication network.

8. The device of claim 7, wherein the data communication network uses the wire pair as a communication medium.