1. A method performed by a network device, comprising:
configuring the network device with an access control list including identification information for authorized client devices and proximity indicators associated with the client devices;
detecting a presence of a client device in proximity to the network device by receiving signals from nearby proximity indicators and decoding identification information from the received signals to determine that the client device is located within communication range of the network device;
determining that the client device is authorized to communicate with the network device by comparing the decoded identification information against the identification information included in the access control list;
turning-on, based on determining that the client device is authorized to communicate with the network device and detecting that the authorized client device is within communication range of the network device, a first signal that comprises:
information for enabling the authorized client device to decode and to access information in a second signal;
wherein the second signal enables communication with the network device;
transmitting the first signal to the authorized client device; and
ceasing transmission of the first signal after (i) initiating communication with the authorized client device, and (ii) determining establishment of a communication with the client device using the second signal, or a pre-set time limit.
2. The method of claim 1, further comprising:
transmitting the second signal continuously during a time when the network device is in service.
3. The method of claim 1, further comprises:
analyzing a property of the received signals to determine whether the client device is within communication range of the network device.
4. The method of claim 1, wherein (1) a detection of the presence of the client device uses a first communication modality, and (2) the communication with the network device uses a second, different communication modality.
5. The method of claim 4, wherein the first communication modality comprises radio frequency communication and the second communication modality comprises cellular communication.
6. A system comprising:
one or more processing devices; and
a non-transitory computer-readable medium configured to store instructions that are executable by the one or more processing devices to perform operations comprising:
configuring a network device with an access control list including identification information for authorized client devices and proximity indicators associated with the client devices;
detecting a presence of a client device in proximity to the network device by receiving signals from nearby proximity indicators and decoding identification information from the received signals to determine that the client device is located within communication range of the network device;
determining that the client device is authorized to communicate with the network device by comparing the decoded identification information against the identification information included in the access control list;
turning-on, based on determining that the client device is authorized to communicate with the network device and detecting that the authorized client device is within communication range of the network device, a first signal that comprises:
information for enabling the authorized client device to decode and to access information in a second signal;
wherein the second signal enables communication with the network device;
transmitting the first signal to the authorized client device; and
ceasing transmission of the first signal after (i) initiating communication with the authorized client device, and (ii) determining establishment of a communication with the client device using the second signal, or a pre-set time limit.
7. The system of claim 6, wherein the operations further comprise:
transmitting the second signal continuously during a time when the system is in service.
8. The system of claim 6, wherein the operations further comprise:
analyzing a property of the received signals to determine whether the client device is within communication range of the system.
9. The system of claim 6, wherein (1) a detection of the presence of the client device uses a first communication modality, and (2) the communication with the system uses a second, different communication modality.
10. The system of claim 9, wherein the first communication modality comprises radio frequency communication and the second communication modality comprises cellular communication.
11. A non-transitory computer-readable medium configured to store instructions that are executable by a network device to perform operations comprising:
configuring the network device with an access control list including identification information for authorized client devices and proximity indicators associated with the client devices;
detecting a presence of a client device in proximity to the network device by receiving signals from nearby proximity indicators and decoding identification information from the received signals to determine that the client device is located within communication range of the network device;
determining that the client device is authorized to communicate with the network device by comparing the decoded identification information against the identification information included in the access control list;
turning-on, based on determining that the client device is authorized to communicate with the network device and detecting that the authorized client device is within communication range of the network device, a first signal that comprises:
information for enabling the authorized client device to decode and to access information in a second signal;
wherein the second signal enables communication with the network device;
transmitting the first signal to the authorized client device; and
ceasing transmission of the first signal after (i) initiating communication with the authorized client device, and (ii) determining establishment of a communication with the client device using the second signal, or a pre-set time limit.
12. The non-transitory computer-readable medium of claim 11, wherein the operations further comprise:
transmitting the second signal continuously during a time when the network device is in service.
13. The non-transitory computer-readable medium of claim 11, wherein the operations further comprise:
analyzing a property of the received signals to determine whether the client device is within communication range of the network device.
14. The non-transitory computer-readable medium of claim 11, wherein (1) a detection of the presence of the client device uses a first communication modality, and (2) the communication with the network device uses a second, different communication modality.
15. The non-transitory computer-readable medium of claim 14, wherein the first communication modality comprises radio frequency communication and the second communication modality comprises cellular communication.
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 circuit protection device comprising:
a substrate;
a conducting layer disposed on said substrate, said conducting layer having at least a first and second terminals;
a resistive element disposed on said substrate;
a conducting pad disposed on said substrate, said conducting pad aligned with said resistive layer;
a dielectric layer disposed on said substrate between said resistive element and said conducting pad;
a spring disposed on said substrate, said spring having a first end electrically connected to said first terminal and a second end electrically connected to said second terminal; and
a low melting material disposed between said conducting pad and at least one of said first and second ends of said spring, wherein said spring has a first conducting position when said first and second ends are connected to respective first and second terminals, said spring having a second open position during an abnormal circuit condition when said resistive element heats said low melting material and at least one of said first and second ends of said spring are displaced away from at least one of said first and second terminals to create an open circuit.
2. The circuit protection device of claim 1 wherein said resistive element is a first resistive element, said device further comprising a second resistive element disposed on said substrate.
3. The circuit protection device of claim 1 further comprising a cover disposed over said spring and attached to said substrate.
4. The circuit protection device of claim 3 wherein said cover includes at least one extended portion configured to increase the surface area of said cover for attachment to said substrate.
5. The circuit protection device of claim 4 wherein said at least one extended portion is configured to receive an attaching material to bond said cover to said substrate.
6. The circuit protection device of claim 4 wherein said at least one extended portion has a textured lower surface configured to receive an attaching material to bond said cover to said substrate.
7. The circuit protection device of claim 4 wherein said at least one extended portion includes a through hole configured to receive an attaching material for locking said cover to said substrate.
8. The circuit protection device of claim 5 wherein said attaching material is an epoxy.
9. The circuit protection device of claim 1 wherein said first terminal and said second terminal are disposed within said device on a first plane.
10. The circuit protection device of claim 9 wherein said spring includes a first side and a second side and wherein when at least one of said first and second ends of said spring are displaced away from at least one of said first and second terminals to create an open circuit, the first side of said spring is displaced within the first plane toward said second side of said spring.
11. The circuit protection device of claim 9 wherein said spring includes a first side and a second side and wherein when at least one of said first and second ends of said spring are displaced away from at least one of said first and second terminals to create an open circuit, the first side of said spring is displaced vertically out of the first plane.
12. The circuit protection device of claim 9 wherein said spring includes a first side and a second side and wherein when at least one of said first and second ends of said spring are displaced away from at least one of said first and second terminals to create an open circuit, the second side of said spring is displaced vertically out of the first plane.
13. A circuit protection device comprising:
a substrate;
a conducting layer disposed on said substrate, said conducting layer having at least a first and second terminals;
a first and second resistive elements disposed on said substrate;
a spring disposed on said substrate, said spring having a first end electrically connected to said first terminal and a second end electrically connected to said second terminal; and
a first and second conducting pads disposed on said substrate between said first and second resistive elements and a low melting material, said first conducting pad aligned with said first resistive element and said second conducting pad aligned with said second resistive element, wherein said low melting material disposed between said first or second conductive pads and at least one of said first and second ends of said spring, wherein said spring has a first conducting position when said first and second ends are connected to respective first and second terminals, said spring having a second open position during an abnormal circuit condition when said resistive element heats said low melting material and at least one of said first and second ends of said spring are displaced away from at least one of said first and second terminals to create an open circuit.
14. The circuit protection device of claim 13 wherein said low melting material is a first portion of low melting material disposed on the first conducting pad to retain said first end of said spring in electrical contact with said first pad, said device further comprising a second portion of low melting material disposed on the second conducting pad to retain said second end of said spring in electrical contact with said second pad.
15. The circuit protection device of claim 14 further comprising a shunt connection disposed between said first and second conducting pads and said first and second ends of said spring, said shunt connection configured to carry the majority of current through said circuit protection device.
16. The circuit protection device of claim 14 wherein said second open position of said spring occurs when said first and second resistive elements heat said first and second portions of low melting material respectively, and at least one of said first and second ends of said spring are displaced away from at least one of said first and second terminals to create an open circuit.
17. A circuit protection device comprising:
a substrate;
a conducting layer disposed on said substrate, said conducting layer having at least a first and second terminals;
a resistive element disposed on said substrate;
a conducting pad disposed on said substrate, said conducting pad aligned with said resistive layer;
a first dielectric layer disposed on said substrate between said resistive element and said conducting pad;
a spring disposed on said substrate, said spring having a first end electrically connected to said first terminal and a second end electrically connected to said second terminal;
a second dielectric layer disposed on said substrate between said conducting pad and said spring; and
a low melting material disposed between the conducting pad and at least one of said first and second ends of said spring, wherein said spring has a first conducting position when said first and second ends are connected to respective first and second terminals, said spring having a second open position during an abnormal circuit condition when said resistive element heats said low melting material and at least one of said first and second ends of said spring are displaced away from at least one of said first and second terminals to create an open circuit.