Broadband radio frequency data communication system using twisted pair wiring
View Patent ↗A system for distributing broadband signals via twisted pair wiring is disclosed. Various aspects of the system involve use of a broadband signal distribution interface device and/or a broadband line driver. In one aspect, a broadband signal distribution interface device includes a broadband signal interface configured to receive broadband radio frequency signals, and a plurality of broadband signal connections configured to distribute broadband radio frequency signals. The interface device also includes circuitry defining an upstream signal path and a downstream signal path and including a gain control circuit and a slope control circuit each positioned along the downstream signal path. The circuitry is configured to accommodate downstream transmission of the broadband signals onto twisted pair wiring.
1. A broadband signal distribution interface device comprising:
(a) a broadband signal interface configured to receive broadband radio frequency signals;
(b) a plurality of broadband signal connections configured to distribute broadband radio frequency signals;
(c) circuitry defining an upstream signal path and a downstream signal path between the broadband signal interface and the plurality of broadband signal connections, the upstream signal path defining a low frequency range and the downstream signal path defining a high frequency range, the circuitry including a gain control circuit and a slope control circuit each positioned along the downstream signal path, wherein the circuitry is configured to accommodate downstream transmission of the broadband signals onto twisted pair wiring.
2. The broadband signal distribution interface device of claim 1 , wherein the broadband signal interface is a coaxial cable interface.
3. The broadband signal distribution interface device of claim 1 , wherein the broadband signal interface is an optical cable interface.
4. The broadband signal distribution interface device of claim 1 , further comprising a control circuit configured to sense an output power level of broadband radio frequency signals.
5. The broadband signal distribution interface device of claim 4 , further comprising a pilot signal generator providing a pilot signal on the downstream path, the pilot signal having a predetermined signal strength and useable by downstream devices to estimate a cable length between the broadband signal distribution interface device and the downstream device based on a level of attenuation of the pilot signal as compared to the predetermined signal strength.
6. The broadband signal distribution interface device of claim 1 , further comprising an automatic indicator placed on at least one of the upstream signal path and the downstream signal path and configured to display an indication of signal strength of broadband radio frequency signals received at the broadband signal distribution interface device.
7. The broadband signal distribution interface device of claim 6 , wherein the automatic indicator includes one or more light emitting diodes indicating an attenuation level of signals received at broadband signal input interface and at least one of the broadband signal connections.
8. A broadband line driver comprising:
(a) a broadband signal interface configured to send and receive broadband radio frequency signals;
(b) a plurality of twisted pair connections, each of the twisted pair connections configured to distribute broadband radio frequency signals;
(c) circuitry defining an upstream signal path and a downstream signal path communicatively connected to the broadband signal input interface, the upstream signal path defining a low frequency range and the downstream signal path defining a high frequency range;
(d) a twisted pair interface circuit having an outbound signal path connecting one of the plurality of twisted pair connections to the downstream signal path and an inbound signal path connecting the one of the plurality of twisted pair connections to the upstream signal path, the twisted pair interface circuit including:
an amplifier positioned on the outbound signal path;
a radio frequency switch positioned on the inbound signal path; and
a voltage monitoring circuit configured to activate one or both of the amplifier and the radio frequency switch depending upon an observed voltage.
9. The broadband line driver of claim 8 , further comprising a cable simulator circuit positioned on the outbound signal path, the cable simulator circuit configured to selectively introduce signal attenuation on the outbound signal path.
10. The broadband line driver of claim 8 , wherein each of the plurality of twisted pair output connections has first, second, third, fourth, fifth, sixth, seventh, and eighth wire connections, and wherein the broadband radio frequency signals are distributed on the seventh and eighth wire connections.
11. The broadband line driver of claim 8 , further comprising an interface circuit associated with each of the plurality of twisted pair output connections.
12. The broadband line driver of claim 8 , further comprising a plurality of broadband radio frequency signal distribution connections.
13. The broadband line driver of claim 12 , wherein the broadband signal interface has a format compatible with a format of the broadband radio frequency signal distribution connections.
14. The broadband line driver of claim 8 , wherein the circuitry includes a gain control circuit.
15. The broadband line driver of claim 14 , wherein the circuitry further includes a control circuit configured to automatically control the gain control circuit based on a pilot signal.
16. The broadband line driver of claim 14 , wherein the circuitry further includes a slope control circuit positioned along the downstream signal path.
17. The broadband line driver of claim 16 , wherein the circuitry further includes a control circuit configured to automatically control the slope control circuit based on a power level of a signal provided to a twisted pair interface circuit.
18. The broadband line driver of claim 16 , wherein the signal provided to a twisted pair interface circuit and used by the control circuit has a frequency at a low end of a range of broadband radio frequency signals transmitted on the downstream path.
19. The broadband line driver of claim 8 , wherein the twisted pair interface circuit includes a telecommunications jack interface.
20. The broadband line driver of claim 19 , wherein the telecommunications jack interface includes an RJ-45 jack.
21. A method of adjusting output power of broadband radio frequency signals on twisted pair lines, the method comprising:
monitoring a reference voltage level received at a broadband line driver via a twisted pair connection;
upon determining that the reference voltage level exceeds a predetermined level, deactivating an amplifier connected to a downstream path leading to the twisted pair connection and setting a radio frequency switch connected along an upstream path to a high attenuation condition;
upon determining that the reference voltage is below a second predetermined level, activating the amplifier and setting the radio frequency switch to a high attenuation condition; and
upon determining that the reference voltage exceeds a third predetermined level, activating the amplifier and setting the radio frequency switch to a low attenuation condition.
22. The method of claim 21 , wherein the broadband line driver has a plurality of twisted pair connections.
23. The method of claim 22 , further comprising:
for each of the plurality of twisted pair connections:
monitoring a reference voltage level received at a broadband line driver on twisted pair lines associated with the respective twisted pair connection;
upon determining that the reference voltage level exceeds a predetermined level, deactivating an amplifier connected to a downstream path leading to the twisted pair connection and setting a radio frequency switch connected along an upstream path to a high attenuation condition;
upon determining that the reference voltage is below a second predetermined level, activating the amplifier and setting the radio frequency switch to a high attenuation condition; and
upon determining that the reference voltage exceeds a third predetermined level, activating the amplifier and setting the radio frequency switch to a low attenuation condition.
24. A broadband signal distribution system useable at a facility, the system comprising:
a broadband signal distribution interface device configured to receive broadband radio frequency signals from a headend and including a plurality of broadband signal connections, the broadband signal distribution interface device including circuitry defining an upstream signal path and a downstream signal path, the circuitry including a gain control circuit and a slope control circuit each positioned along the downstream signal path, wherein the circuitry is configured to accommodate downstream transmission of the broadband signals onto twisted pair wiring;
a plurality of broadband line drivers communicatively coupled to the broadband signal connections of the broadband signal distribution interface device, each of the plurality of broadband line drivers including a plurality of twisted pair interfaces, each twisted pair interface associated with a twisted pair interface circuit having an outbound signal path and an inbound signal path, the twisted pair interface circuit including an amplifier positioned on the outbound signal path and a radio frequency switch positioned on the inbound signal path, and a voltage monitoring circuit configured to activate one or both of the amplifier and the radio frequency switch depending upon an observed voltage or a signal received from an active balun device configured to receive broadband signals over twisted pair wiring for connection to a broadband endpoint.
25. The system of claim 24 , further comprising a second broadband line driver communicatively connected to one of the plurality of broadband line drivers, thereby forming a cascaded arrangement of broadband line drivers.
26. The system of claim 24 , wherein the broadband radio frequency signals include cable television signals.