Method and system for power management in a frequency division multiplexed network
A network device may receive a signal from a headend, wherein a bandwidth of the received signal spans from a low frequency to a high frequency and encompasses a plurality of sub-bands. The network device may determine, based on communication with the headend, whether one of more of the sub-bands residing above a threshold frequency are available for carrying downstream data from the headend to the circuitry. The network device may digitize the signal using an ADC operating at a sampling frequency. The sampling frequency may be configured based on a result of the determining. When the sub-band(s) are available for carrying downstream data from the headend to the network device, the sampling frequency may be set to a relatively high frequency. When the sub-band(s) are not available for carrying downstream data from the headend to the network device, the sampling frequency may be set to a relatively low frequency.
1. A system comprising:
an analog filter operable to filter an analog signal comprising one or more occupied frequency bands, wherein the one or more occupied frequency bands comprise critical data and non-critical data, and wherein the analog filter is operable to produce a filtered signal;
an analog-to-digital converter operable to digitize the filtered signal; and
a frequency controller operable to adjust a cut-off frequency of the analog filter, wherein during a power saving mode the cut-off frequency is adjusted according to a highest frequency of the critical data in the one or more occupied frequency bands, and wherein the highest frequency of the critical data is selectable and communicated as a threshold value.
2. The system of claim 1 , wherein the frequency controller is operable to adjust a sampling frequency of the analog-to-digital converter to at least twice the highest frequency of the critical data in the one or more occupied frequency bands.
3. The system of claim 2 , wherein the cut-off frequency of the filter is adjustable to equal the sampling frequency of the analog-to-digital converter.
4. The system of claim 1 , wherein a frequency response of the analog filter is configurable during runtime of the system according to the threshold value.
5. The system of claim 1 , wherein the frequency controller is operable to negotiate a minimum sampling frequency with a signal source.
6. The system of claim 1 , wherein the frequency controller is operable to determine a minimum sampling frequency based on communications from a signal source.
7. The system of claim 1 , wherein the highest frequency of the one or more occupied frequency bands is communicated in a message from a source of the analog signal.
8. The system of claim 7 , wherein the source of the analog signal is a cable headend.
9. A method comprising:
filtering, with an analog filter, an analog signal comprising one or more occupied frequency bands, wherein the one or more occupied frequency bands comprise critical data and non- critical data, and wherein the analog filter is operable to produce a filtered signal;
digitizing the signal filtered signal with an analog-to-digital converter;
receiving a threshold value; and
adjusting a cut-off frequency of the analog filter, wherein during a power saving mode the cut-off frequency is adjusted according to a highest frequency of the critical data in the one or more occupied frequency bands, wherein the highest frequency of the critical data is selectable and communicated as the threshold value.
10. The method of claim 9 , wherein the method comprises adjusting a sampling frequency of the analog-to-digital converter to at least twice the highest frequency of the critical data in the one or more occupied frequency bands.
11. The method of claim 10 , wherein the method comprises adjusting the cut-off frequency of the filter to equal the sampling frequency of the analog-to-digital converter.
12. The method of claim 9 , wherein the method comprises configuring a frequency response of the analog filter during runtime according to the threshold value.
13. The method of claim 9 , wherein the method comprises negotiating a minimum sampling frequency with a signal source.
14. The method of claim 9 , wherein the method comprises determining a minimum sampling frequency based on communications from a signal source.
15. The method of claim 9 , wherein the highest frequency of the one or more occupied frequency bands is communicated in a message from a source of the analog signal.
16. The system of claim 15 , wherein the source of the analog signal is a cable headend.