Addressing and locating in-line coaxial cable devices within customer premises in cable-based networks
An exemplary apparatus for use in a cable-based network includes passive circuitry coupled with an input of the apparatus and configured to generate an output signal having frequency response characteristics controlled as a function of a value of at least one component in the passive circuitry. The apparatus further includes active circuitry coupled with the input of the apparatus. The active circuitry is configured to generate a message signal indicative of a presence of the apparatus in the cable-based network in response to an interrogation signal supplied to the apparatus.
1. An in-line coaxial cable apparatus for use in a cable-based network, the apparatus comprising:
passive circuitry coupled in-line with the cable-based network, the passive circuitry being configured to receive an input signal from the cable-based network and to generate an output signal having frequency response characteristics controlled as a function of a value of at least one component in the passive circuitry; and
active circuitry coupled with an input of the apparatus, the active circuitry being configured to generate a message signal in response to an interrogation signal supplied to the apparatus in a prescribed spectrum of the input signal, the message signal being combined with the output signal generated by the passive circuitry to form an output of the apparatus which is conveyed over the cable-based network, the message signal being indicative of a presence of the apparatus in the cable-based network.
2. The apparatus of claim 1 , wherein the passive circuitry comprises at least one filter configured to generate the output signal of the apparatus, the frequency response characteristics of the output signal being controlled as a function of at least one of a topology of the filter and a value of at least one component in the filter.
3. The apparatus of claim 1 , wherein the passive circuitry is AC-coupled with the input of the apparatus and the active circuitry is directly coupled with the input of the apparatus.
4. The apparatus of claim 1 , wherein the active circuitry comprises a power supply module coupled with the input of the apparatus, the power supply module being configured to receive a control signal and to generate a supply voltage for powering one or more functional modules in the active circuitry.
5. The apparatus of claim 4 , wherein the power supply module is configured to extract a voltage signal from the interrogation signal supplied to the apparatus and to generate from the voltage signal the supply voltage for powering the one or more functional modules in the active circuitry.
6. The apparatus of claim 4 , wherein the active circuitry further comprises:
clock circuitry configured to generate a clock signal;
a codeword generator configured to receive the clock signal and to generate a coded bitstream comprising the message signal indicative of the presence of the apparatus in the cable-based network; and
a mixer coupled with an output of the apparatus and configured to combine the message signal with the output signal generated by the passive circuitry to form the output of the apparatus.
7. The apparatus of claim 1 , wherein the active circuitry comprises:
a receiver coupled with the input of the apparatus, the receiver being configured to monitor an input signal supplied to the apparatus and to generate a control signal in response to receiving the interrogation signal;
a power supply module configured to receive the control signal and to selectively energize a subset of circuits in the active circuitry as a function of the control signal;
clock circuitry configured to generate a clock signal;
a codeword generator configured to receive the clock signal and to generate a coded bitstream comprising the message signal indicative of the presence of the apparatus in the cable-based network; and
a mixer coupled with an output of the apparatus and configured to combine the message signal with the output signal generated by the passive circuitry in forming the output of the apparatus.
8. The apparatus of claim 7 , wherein the power supply module is configured to selectively energize the clock circuitry, the codeword generator and the mixer as a function of the control signal.
9. The apparatus of claim 7 , wherein the power supply module comprises a battery and switching circuitry, the switching circuitry being configured to selectively connect the battery with the clock circuitry, the codeword generator and the mixer as a function of the control signal.
10. The apparatus of claim 7 , wherein the power supply module is configured to transmit a low-battery warning signal when a voltage level of the battery falls below a prescribed threshold value.
11. The apparatus of claim 7 , wherein the mixer is configured to combine the message signal with the output signal using modulation.
12. The apparatus of claim 11 , wherein the modulation used by the mixer to combine the message signal with the output signal comprises at least one of amplitude modulation, frequency modulation, frequency-shift keying modulation and phase-shift keying modulation.
13. The apparatus of claim 7 , wherein the receiver remains powered on to at least periodically monitor the input signal for a presence of the interrogation signal.
14. The apparatus of claim 1 , wherein the message signal generated by the active circuitry comprises at least one of a unique identifier corresponding to the apparatus and a type of the apparatus.
15. The apparatus of claim 1 , wherein the active circuitry, in response to receiving the interrogation signal supplied to the apparatus, is configured to repeatedly transmit the message signal in intervals, a timing of the intervals varying within a range according to a prescribed tolerance of the active circuitry.
16. The apparatus of claim 1 , wherein the passive circuitry comprises a multimedia over coax alliance (MoCA) point-of-entry filter.
17. The apparatus of claim 1 , wherein the active circuitry comprises a programmable register adapted to store a delay value, a time interval between successive transmissions of the message signal by the apparatus being controlled as a function of the delay value.
18. A method for locating an in-line passive coaxial cable device in a cable-based network at a customer premises, the method comprising:
providing active circuitry integrated with the passive coaxial cable device and coupled with an input of the device, the active circuitry being configured to generate and transmit a message signal conveyed over the cable-based network in response to an interrogation signal received by the active circuitry in a prescribed spectrum of an input signal supplied to the device;
injecting the interrogation signal into the cable-based network; and
monitoring the cable-based network for a presence of the message signal transmitted by the active circuitry, the message signal indicating a presence of the device in the cable-based network.
19. The method of claim 18 , further comprising extracting, by the active circuitry, a voltage signal from the interrogation signal supplied to the passive coaxial cable device and generating therefrom, by the active circuitry, the supply voltage for powering one or more functional modules in the active circuitry.
20. The method of claim 18 , further comprising combining the message signal with an output signal generated by the passive coaxial cable device, the message signal being combined in such a manner that the message signal can be extracted from the output signal as at least a portion of the monitoring step.
21. The method of claim 20 , wherein the step of combining the message signal with the output signal comprises modulating the output signal with the message signal.
22. The method of claim 21 , wherein a modulation scheme used in the modulating comprises at least one of amplitude modulation, frequency modulation, frequency-shift keying modulation and phase-shift keying modulation.
23. The method of claim 18 , further comprising:
generating, by the active circuitry, a control signal in response to receiving the interrogation signal; and
selectively energizing at least a subset of circuits in the active circuitry as a function of the control signal.