Method and apparatus for detecting the presence of a remote device and providing power thereto

• US 5,991,885 A
• Filed: 06/11/1997
• Issued: 11/23/1999
• Est. Priority Date: 06/11/1997
• Status: Expired due to Term

• Current Assignee: RPX Corporation
• Original Assignee: Clarinet Systems, Inc.
• Inventors: Yu, Fang C., Chang, Wen F.
• Primary Examiner(s): Auve, Glenn A.
• Assistant Examiner(s): Wiley, David A.
• Application Number:
  US08/872,977
• Time in Patent Office: 895 Days
• Field of Search: 395/750.01, 395/750.08, 395/200, 713/300, 710/62
• US Class Current: 713/300
• CPC Class Codes: G06F 1/26 Power supply means, e.g. regulation thereof for memories G11C
• CPC Class Codes: H04L 69/08 Protocols for interworking; Protocol conversion
• CPC Class Codes: H04L 9/40 Network security protocols

Abstract

A network system includes a network that detects the presence of a remote terminal connected to a network and determines the functional protocol of the remote terminal. If the remote terminal is an infrared adapter, the network hub provides electrical power to the infrared adapter and continually monitors for the presence of the infrared adapter. Upon removal of the infrared adapter, the network removes electrical power that is applied to a user interface connector that connects to the infrared adapter. If another protocol is detected for the remote terminal, the network hub communicates with the remote terminal in that protocol and converts the data to the protocol of the network.

Claims

1. A method of providing electrical power to a device upon the detection of the presence of the device communicating with a network system comprising the steps of:

providing a presence request signal by sending a bipolar timing signal to the device providing a response signal from the device;

detecting the presence of a device on a communication line by receiving the response signal from the device;

determining the type of device present;

providing electrical power to the device over the communication line in response to the type of device and the detected presence; and

stop providing the electrical power to the device when the presence of the device is no longer detected;

communicating with the device in a first protocol in response to detection of the presence of the device.

2. The method of claim 1 wherein:

the detected device indicates its continuous presence from the provided electrical power.

3. The method of claim 2 wherein the detected device includes an electrical power source and indicates its presence from the electrical power source.

4. The method of claim 1 wherein the presence request signal is a symmetric bipolar timing signal.

5. The method of claim 1 further comprising the steps of:

wireless communicating with the detected device.

6. A method according to claim 1 wherein the step of determining the type of device present further comprises the steps of:

providing electrical power to the device and communicating with the device in a first protocol in response to a detected first type of device; and

communicating with the device in a second protocol in response to a detected second type of device.

7. The method of claim 6 further comprising:

communicating data between another network hub and the device in response to a dedicated second type of device.

8. A network system comprising:

a plurality of user interface connectors each adapted for coupling to a remote device; and

a network hub coupled to the plurality of user interface connectors for communicating data between remote terminals coupled thereto, for identifying the operational protocol of a coupled device that indicates the type of device and communicating with said coupled remote device in said identified operational protocol, and for identifying the presence of an adapter of a first type coupled to at least one of the plurality of user interface connectors and continuously providing electrical power to the adapter according to the type of device in response to the identified presence of said adapter and stop providing the electrical power to the adapter in response to no identified presence of the adapter.

9. The network system of claim 8 wherein the operational protocol may be an Ethernet protocol.

10. The network system of claim 8 wherein the operational protocol may be a Token Ring protocol.

11. The network system of claim 8 wherein the operational protocol may be a wireless LAN protocol.

12. A method of providing electrical power to a device upon the detection of the presence of the device communicating with a network system comprising the steps of:

applying a presence request signal on a communication line;

monitoring the communication line for a presence signal;

receiving a presence signal from the device;

providing a control signal on a communication line when the presence signal is a continuous presence signal;

providing the presence request signal on a communication line when the feedback signal is not a continuous presence signal; and

providing electrical power to the device according to the type of device when the signal is a continuous presence signal.

13. A device according to claim 12 further comprising the step of receiving a device identifier that indicates the type of device.

14. A network system comprising:

a plurality of user interface connectors each adapted for coupling to a remote device;

a first network hub for communicating in a first operational protocol and for sending a bipolar timing signal to the remote device to receive a response signal from the device to indicate the presence of the adapter; and

a second network hub coupled to the plurality of user interface connectors for communicating data between devices coupled thereto and coupled to the first network hub, for identifying the type of device and the operational protocol of a coupled device, when the identified operational protocol of the coupled device is a first operational protocol, and communicating with said coupled device in a second operational protocol when the identified operational protocol of the coupled device is a second operational protocol, and for identifying the presence of an adapter of a first type coupled to at least one of the plurality of user interface connectors and continuously providing electrical power to the adapter in response to the identified presence of said adapter, and for stopping the providing of electrical power to the adapter in response to no identified presence of the adapter.

15. A system for controlling the application of electrical power to a detected device, comprising:

a signal generator having a first input for receiving a bipolar timing signal, having a

second input for receiving a control signal, and having a third input for receiving a select signal, and having an output for providing a presence request signal in response to the select signal being in a first logic state and for providing the control signal in response to the select signal being in a second logic state; and

a feedback analyzer having an input for coupling to a device and having an output for providing a presence signal in response to a presence signal detected from the coupled device the device being detected as a particular type of device, and being coupled to the output of the signal generator, for providing the select signal in a second logic state when such a device is detected and providing a select signal of a first logic state when such a device is not detected, and for controlling the application of electrical power to the coupled device according to the type of device in response to the presence signal.

16. A detection circuit configured to detect the presence of a remote device communicating with a computer network system comprising:

a signal generator configured to generate a bipolar timing signal and to send the signal to a device communicating with the network system;

a feedback analyzing circuit configured to receive a signal sent by the device in response to the bipolar timing signal sent by the signal generator to determine whether the device is present in the system;

a detection circuit configured to determine the mode of operation under which the device operates.

17. A detection circuit according to claim 16 further comprising:

a power generator configured to deliver power to the device according to the device'"'"'s operational mode of operation.

18. A detection circuit according to claim 17, wherein the first mode of operation indicates that it is safe to send power to the device and wherein the second mode of operation indicates that it is not safe to send power to the device.