1. A method, comprising synchronizing, at a broadband loop carrier terminal, a time local to the broadband loop carrier terminal to a network time received from a source external to the broadband loop carrier terminal by comparing the local time to the network time to generate an error offset, by applying a tracking filter to the error offset, wherein the tracking filter includes a fast converging frequency tracking filter and a slow converging phase tracking filter, and by adjusting the local time based on an output of the tracking filter.
2. A method, comprising synchronizing at a broadband loop carrier terminal, a time local to the broadband loop carrier terminal to a network time received from a source external to the broadband loop carrier terminal by comparing the local time to the network time to generate an error offset, by applying a jitter filter to the error offset, and by adjusting the local time based on an output of the jitter filter.
3. The method of claim 2, further comprising applying a tracking filter to the output of the jitter filter such that the adjusting is based on an output of the tracking filter.
4. A method, comprising synchronizing, at a broadband loop carrier terminal, a time local to the broadband loop carrier terminal to a network time received from a source external to the broadband loop carrier terminal by comparing the local time to the network time to generate an error offset, and adjusting the local time based on the error offset and at least a factory calibration and a temperature compensation.
5. A system comprising:
a source of network time;
a central office terminal coupled to receive the network time over a first communication medium via a plesiochronous communication protocol;
a remote terminal coupled to receive the network time from the central office terminal over a second communication medium via an asynchronous packet based protocol, and comprising a phase lock loop rate adapter to adjust a local time according to a difference between the local time and the network time, wherein the remote terminal is configured to adjust the local time using a filtered error offset between the local time and the network time, wherein the filtered error offset is produced using a jitter filter configured and a tracking filter, the jitter filter configured to receive a time offset error signal representing a difference between the network time and the local time, and to produce an output signal to the tracking filter.
6. The system of claim 5, wherein the tracking filter is configured to provide the filtered error offset based on the time offset error signal produced by the jitter filter.
7. The system of claim 6, wherein the remote terminal further comprises control logic configured to utilize the filtered error offset in controlling a frequency of a local oscillator used to produce the local time.
8. The system of claim 7, wherein the control logic is further configured to utilize temperature compensation in controlling a frequency of the local oscillator.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A lamp comprising:
a source plate having a first side and a second side;
a plurality of light sources, wherein a first set of the plurality of light sources generates white light and is attached to the first side of the source plate, and wherein a second set of the plurality of light sources generates colored light and is attached to the second side of the source plate;
a lens that encapsulates the first set of the plurality of light sources and redirects the white light generated by the first set of the plurality of light sources; and
a diffuser plate and a driver insulator, each in contact with the second side of the source plate, wherein the diffuser plate, the driver insulator, and the second side of the source plate define a light box region in which the second set of the plurality of light sources is located, and wherein the driver insulator acts as a reflector and the diffuser plate acts as a diffuser, such that colored light generated by the second set of the plurality of light sources is dispersed from the light box region through the diffuser plate.
2. The lamp of claim 1 wherein the plurality of light sources comprises a plurality of LEDs.
3. The lamp of claim 2 wherein the first set of the plurality of light sources comprises a set of LEDs that generate white light, and wherein the second set of the plurality of light sources comprises a set of LEDs that generate colored light.
4. The lamp of claim 1 comprising:
a switch mechanism, wherein the switch mechanism allows power to be provided to only the first set of the plurality of light sources, to only the second set of the plurality of light sources, and to the plurality of light sources.
5. The lamp of claim 1 wherein the lens comprises:
collimating optics; and
a diffuser.
6. The lamp of claim 5 wherein the diffuser plate and the diffuser of the lens are made of the same material.
7. The lamp of claim 1 comprising:
driver electronics, wherein the driver electronics drive the first set of the plurality of lights sources and the second set of the plurality of light sources.
8. The lamp of claim 7 wherein the driver insulator surrounds the driver electronics.
9. The lamp of claim 1 wherein the first set of the plurality of light sources is oriented in a first direction and wherein the second set of the plurality of light sources is oriented in a second direction.
10. The lamp of claim 9 wherein the second direction is 180 degrees different from the first direction.
11. The lamp of claim 10 wherein the second set of the plurality of light sources is oriented at an acute angle offset from the second direction.
12. The lamp of claim 1 wherein an exterior surface of the diffuser plate is dome-shaped, and serves as an outer wall of the lamp.
13. The lamp of claim 1 wherein the source plate is a printed circuit board.
14. The lamp of claim 13 comprising a heat sink surrounding the plurality of light sources and the printed circuit board, wherein the heat sink and the printed circuit board prevent colored light generated by the second set of the plurality of light sources from mixing with white light generated by the first set of the plurality of light sources.
15. The lamp of claim 1 wherein the second set of the plurality of light sources comprises a first group that generates light of a first color and a second group that generates light of a second color, the lamp further comprising:
a divider, the divider placed within the light box region, between the driver insulator and the diffuser plate, such that the light box region is divided into a first region and a second region, wherein the first region disperses light of the first color generated by the first group, and wherein the second region disperses light of the second color generated by the second group.
16. A retrofit lamp comprising:
a base, the base connectable into a lamp socket;
a source plate having a first side and a second side;
a plurality of LED-based light sources, wherein a first set of the plurality of LED-based light sources generates white light and is attached to the first side of the source plate, and wherein a second set of the plurality of LED-based light sources generates colored light and is attached to the second side of the source plate;
driver electronics to drive the plurality of LED-based light sources, wherein the driver electronics are electrically connected to the base and the source plate;
a driver insulator that surrounds the driver electronics, extends from the base to the source plate and is in contact with the second side of the source plate;
a lens that encapsulates the first set of the plurality of LED-based light sources and redirects the white light generated by the first set of the plurality of LED-based light sources;
a diffuser plate, the diffuser plate in contact with the second side of the source plate, wherein the diffuser plate, the driver insulator, and the second side of the source plate define a light box region in which the second set of the plurality of light sources is located, and wherein the driver insulator acts as a reflector and the diffuser plate acts as a diffuser, such that colored light generated by the second set of the plurality of light sources is dispersed from the light box region through the diffuser plate;
a retaining ring that connects the diffuser plate to the base; and
a heat sink that connects the lens to the diffuser plate.