Self-terminating coaxial to unshielded twisted-pair cable passive CATV distribution panel

• US 5,950,111 A
• Filed: 09/25/1997
• Issued: 09/07/1999
• Est. Priority Date: 09/25/1997
• Status: Expired due to Fees

• Current Assignee: CommScope Inc. (CommScope Holding Company, Inc.)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Georger, William Hugo, Rutkowski, John Anthony
• Primary Examiner(s): Kostak, Victor R.
• Application Number:
  US08/937,174
• Time in Patent Office: 712 Days
• Field of Search: 361/58, 361/66, 361/65, 361/67, 361/68, 361/627, 361/728, 348/6, 348/12, 439/579, 439/578, 324/525, 324/537, 324/750, 324/754, 324/756, 324/761, 370/652, 370/653, 379/27, 455/3.1
• US Class Current: 455/3.01
• CPC Class Codes: H01R 24/547 Splitters
• CPC Class Codes: H01R 31/005 Intermediate parts for distributing signals
• CPC Class Codes: H04N 7/104 Switchers or splitters
• CPC Class Codes: H04N 7/108 the cable being constituted by a pair of wires

Abstract

The invention provides an apparatus, system and method for distributing passively a coaxial based CATV RF signal over unshielded twisted-pair cables. The distribution of the coaxial based CATV RF signal involves distributing the signal into a group of output signals. The output signals are then coupled to unshielded twisted-pair cables. If the unshielded twisted-pair cable is detached, the output signal is terminated through a resistor. Thus, a coaxial based CATV RF signal can be distributed to many unshielded twisted-pair cables with any unused output signals being properly terminated.

Claims

1. Device for distributing passively a coaxial based broadband signal over unshielded twisted-pair cable, said device comprising:

an input port for coupling the device to the coaxial based broadband signal;

a splitting means connected to the input port for distributing the coaxial based broadband signal into a plurality of output signals; and

a coupling means for dispersing each of the plurality of output signals to a corresponding unshielded twisted-pair cable, each said corresponding unshielded twisted-pair cable having a characteristic impedance of Z₁, the coupling means comprising;

a terminating means associated with each of the plurality of output signals, each said terminating means having a first end and a second end, the first end of each said terminating means receiving one of the plurality of output signals and the second end of each said terminating means adapted to accept the corresponding unshielded twisted-pair cable, each said terminating means having an impedance Z₂ when the corresponding unshielded twisted-pair cable is uncoupled from said one of the plurality of output signals, the impedance Z₂ being equal to the characteristic impedance Z₁, of the corresponding unshielded twisted-pair cable.

2. The device according to claim 1, wherein the coaxial based broadband signal is a CATV RF broadband signal.

3. The device according to claim 1, wherein the plurality of output signals are automatically uncoupled to each said terminating means when the corresponding unshielded twisted-pair cable is attached.

4. The device according to claim 2, wherein each said terminating means is a modular output jack associated with said one of the plurality of output signals.

5. A system for distributing passively a coaxial based CATV RF signal over an unshielded twisted-pair cable comprising:

a coaxial cable connector;

a splitting circuit coupled to the coaxial cable connector;

the splitting circuit having a plurality of outputs; and

a plurality of self-terminating modular output jacks coupled to a corresponding output of the splitting circuit.

6. The system according to claim 5, wherein each of the plurality of self-terminating modular output jacks comprises:

a first transmit pin and a second transmit pin, the first transmit pin and the second transmit pin being coupled to an output of the splitting circuit;

a first terminating pin and a second terminating pin, the first transmit pin being shunted to the first terminating pin and the second transmit pin being shunted to the second terminating pin; and

a resistor connected between the first terminating pin and the second terminating pin.

7. A method for distributing passively a coaxial based broadband signal over an unshielded twisted-pair cable, comprising the steps of:

splitting the coaxial based broadband signal into a plurality of output signals;

coupling a plurality of unshielded twisted-pair cables to a corresponding output signal, each of said plurality of unshielded twisted-pair cables having a characteristic impedance of Z₁ ; and

terminating the corresponding output signal when one of said plurality of unshielded twisted-pair cables is not coupled to the corresponding output signal.

8. The method according to claim 7, in which the terminating step includes the step of:

providing an impedance Z₂ equal to the characteristic impedance Z₁, of each of said plurality of unshielded twisted-pair cables when one of said unshielded twisted-pair cables is not connected to the corresponding output signal.

9. The method according to claim 8, in which the terminating step includes the step of:

automatically uncoupling said impedance Z₂ from the corresponding output signal when one of said plurality of unshielded twisted-pair cables is coupled to the corresponding output signal.

10. The method according to claim 7, in which the coupling step comprises the steps of:

providing a plurality of modular output jacks for receiving one of said plurality of output signals; and

joining one of said plurality of modular output jacks to one of said plurality of unshielded twisted-pair cables.

11. The method according to claim 7, wherein the coaxial based broadband signal is a CATV RF broadband signal.