Connecting arrangement for reducing induced noise

• US 5,995,591 A
• Filed: 12/20/1996
• Issued: 11/30/1999
• Est. Priority Date: 10/25/1996
• Status: Expired due to Fees

• Current Assignee: Nortel Networks Limited (Nortel Networks Corporation)
• Original Assignee: Nortel Networks Corporation
• Inventors: Halim, Moe A.
• Primary Examiner(s): Bost, Dwayne D.
• Assistant Examiner(s): LEGREE, TRACY MICHELLE
• Application Number:
  US08/772,674
• Time in Patent Office: 1,075 Days
• Field of Search: 379/55.1, 455/501, 455/556, 455/557, 455/559, 455/63, 455/462, 455/465, 455/90, 455/575, 381/77, 439/676, 439/101, 439/941
• US Class Current: 379/55.1
• CPC Class Codes: H01R 13/6464 by adding capacitive elements
• CPC Class Codes: H01R 13/719 specially adapted for high frequency, e.g. with filters
• CPC Class Codes: Y10S 439/941 Crosstalk suppression

Abstract

A fixed wireless access subscriber unit extension telephone cable connecting arrangement is disclosed. The cable itself includes a single pair of wires for carrying the tip and ring signals between the subscriber unit and an extension telephone set. The cable also includes at least one additional wire, or pair of wires. This additional wire or pair of wires is connected to an effective ground, thus reducing the noise signal induced in the cable which is passed to the extension telephone set. This effective ground can be a node within the fixed wireless access subscriber unit which serves as the electrical common for the unit. In this case it is preferable to connect the additional wire, or pair of wires to the effective ground via a suitable capacitor or capacitors.

Claims

1. A transceiver interface unit for communicating with a device via a cable, said cable including a first pair of wires for conducting desired signals between said interface unit and said device and at least one additional wire, said transceiver interface unit comprising:

an effective ground comprising an electrical common or a ground connection;

circuitry for communicating with said device; and

a cable connector for connecting to said cable, said cable connector comprising;

a first pair of connectors for connecting said first pair of wires with said circuitry; and

a ground connector for connecting said at least one additional wire to said effective ground, wherein said ground connector comprises a capacitor coupling said at least one additional wire to said effective ground.

2. A transceiver interface unit for communicating with a device via a cable, said cable including a first pair of wires for conducting desired signals between said interface unit and said device and at least one additional wire, said transceiver interface unit comprising:

an effective ground comprising an electrical common or a ground connection;

circuitry for communicating with said device; and

a cable connector for connecting to said cable, said cable connector comprising;

a first pair of connectors for connecting said first pair of wires with said circuitry; and

a ground connector for connecting said at least one additional wire to said effective ground, wherein said ground connector comprises a capacitor coupling said at least one additional wire to said effective ground, wherein said at least one additional wire comprises a pair of wires and wherein said ground connector comprises a capacitor for each wire of said pair of wires, said capacitor adapted to ground each wire at RF frequencies while providing a high impedance at normal telephony frequencies.

3. A transceiver interface unit as claimed in claim 2, wherein said cable connector also comprises a RF filter.

4. An improved connecting arrangement for transmitting desired signals in the presence of electromagnetic radiation, said connecting arrangement comprising:

a cable comprising;

a first pair of wires for conducting the desired signal from a first device to a second device;

at least one additional wire; and

a RF filter;

a first connector for connecting said cable to said first device, said first connector comprising;

a first pair of connections for connecting said first pair of wires to said first device; and

a ground connection arrangement for effectively grounding said at least one additional wire; and

a second connector for connecting said cable to said second device, said second connector comprising a second pair of connections for connecting said first pair of wires to said second device.

5. An improved connecting arrangement for transmitting desired signals in the presence of electromagnetic radiation, said connecting arrangement comprising:

a cable comprising;

a first pair of wires for conducting the desired signal from a first device to a second device;

at least one additional wire; and

a RF filter;

a first connector for connecting said cable to said first device, said first connector comprising;

a first pair of connections for connecting said first pair of wires to said first device; and

a ground connection arrangement for effectively grounding said at least one additional wire; and

a second connector for connecting said cable to said second device, said second connector comprising a second pair of connections for connecting said first pair of wires to said second device, wherein said at least one additional wire comprises a pair of wires and wherein said ground connection arrangement comprises a capacitor for each wire of said pair of wires, said capacitor adapted to ground each wire at RF frequencies while providing a high impedance at normal telephony frequencies.

6. A transceiver interface unit for communicating with a device via a cable, said cable including a first pair of wires for conducting desired signals between said interface unit and said device and at least one additional wire, said transceiver interface unit comprising:

an effective ground comprising an electrical common or a ground connection;

circuitry for communicating with said device; and

a cable connector for connecting to said cable, said cable connector comprising;

a first pair of connectors for connecting said first pair of wires with said circuitry; and

a ground connector for connecting said at least one additional wire to said effective ground, wherein said ground connector comprises a capacitor coupling said at least one additional wire to said effective ground, said capacitor selected to ground said at least one wire at RF frequencies while providing a high impedance at normal telephony frequencies.

7. An improved connecting arrangement for transmitting desired signals in the presence of electromagnetic radiation, said connecting arrangement comprising:

a cable comprising;

a first pair of wires for conducting the desired signal from a first device to a second device;

at least one additional pair of wires; and

a RF filter;

a first connector for connecting said cable to said first device, said first connector comprising;

a first pair of connections for connecting said first pair of wires to said first device; and

a ground connection arrangement for effectively grounding said at least one additional pair of wires; and

a second connector for connecting said cable to said second device, said second connector comprising a second pair of connections for connecting said first pair of wires to said second device.