USB communication transceiver using optical link

• US 7,324,757 B2
• Filed: 03/07/2002
• Issued: 01/29/2008
• Est. Priority Date: 03/14/2001
• Status: Active Grant

• Current Assignee: British Telecommunications Public Limited Company
• Original Assignee: British Telecommunications PLC (BT Group PLC)
• Inventors: Bull, Michael S, Wilson, Richard C
• Primary Examiner(s): PASCAL, LESLIE C
• Application Number:
  US10/468,779
• Publication Number:
  US 20040072540A1
• Time in Patent Office: 2,154 Days
• Field of Search: 398/118, 398/138, 398135-152, 398/164, 398/107, 398115-117, 398/130, 398/185, 398/201, 398/106
• US Class Current: 398/116
• CPC Class Codes: H04B 10/1149 Arrangements for indoor wireless networking of information
• CPC Class Codes: H04B 10/40 Transceivers

Abstract

An optical version of USB is provided to enable PDAs and digital cameras to download data and media files to remote network servers. The PDA is plugged into an optical transceiver that communicates with a complementary transceiver located in a network terminal (for example a payphone) that is in communication with the network server.

Claims

1. An optical transceiver, the transceiver comprising:

means enabling an associated electronic device to transmit and receive data signals in a USB two channel format, and

a pair of transmitter means to directly modulate the received USB two channel-format signals onto respective optical carriers, and a pair of receivers to extract USB two channel-format modulated signals from respective optical carriers.

2. A transceiver according to claim 1, further comprising:

means for detecting a configuration of an electronic device to which it is connected, means for generating data in accordance with the detected configuration,

means for detecting an idle period in the transmitted and received data signals, and

means for transmitting the generated configuration data over the optical carriers during said idle period.

3. A transceiver according to claim 2, wherein the configuration data relates to the data rate at which the electronic device is to operate.

4. A transceiver according to claim 1, further comprising:

means for detecting an idle period in the transmitted and received data signals,

means for receiving configuration data over the optical carriers during said idle periods, and

means for configuring the electronic device according to the configuration data.

5. A transceiver according to claim 1, further comprising transmission means for transmitting an alert signal to a co-operating transceiver.

6. A transceiver according to claim 5, wherein the transmission means is a pulsed light emitting diode.

7. A transceiver according to claim 1, further comprising:

detection means for detecting an alert signal indicative that a co-operating transceiver is present.

8. A transceiver according to claim 7, wherein the detection means comprises an optical sensor.

9. A transceiver according to claim 1 arranged for time division duplex operation with a co-operating transceiver.

10. A transceiver according to claim 9, further comprising:

means for transmitting a control signal for controlling operation of a co-operating transceiver,

means for operating in receive mode for a predetermined period after transmission of the control signal,

means for detecting signals received from the co-operating transceiver, and

means for switching to transmit mode if no such signals are detected.

11. A transceiver according to claim 1, further comprising:

means for connection to and disconnection from an associated electronic device.

12. A transceiver according to claim 11, wherein the connection is a wired connection operable in USB format.

13. A transceiver according to claim 1 wherein the optical transceiver is incorporated in a docking port for connection to a complementary docking port having a corresponding transceiver, the docking ports having alignment means arranged such that plural optical interfaces in one transceiver are aligned with respectively corresponding plural optical interfaces in a corresponding further transceiver so as to minimize interference between corresponding plural optical communication channels, and from external light sources.

16. A communications terminal, the terminal comprising:

a transceiver according to claim 1 and the associated electronic device.

17. A communications terminal according to claim 16, connected to a storage device by a communications network.

18. A communications terminal according to claim 16, further comprising means for processing payment for use of the terminal.

19. A communications terminal as in claim 16 wherein the optical transceiver is incorporated in a docking port for connection to a complementary docking port having a corresponding transceiver associated with alignment means arranged such that plural optical interfaces in one transceiver are aligned with respectively corresponding plural optical interfaces in a corresponding further transceiver so as to minimize interference between corresponding plural optical communication channels, and from external light sources.

14. An optical transceiver, the receiver comprising:

means enabling an associated electronic device to transmit and receive data signals in a USB two channel format, and

means to directly modulate the received USB-format signals onto a pair of optical carriers, and to extract USB two channel-format modulated signals from a pair of optical carriers,

said transceiver being arranged for time division duplex operation with a co-operating transceiver;

detection means for detecting a control signal from a co-operating transceiver, and

means for putting the transceiver into transmit mode in response to the control signal.

15. An optical transceiver, the transceiver comprising:

means enabling an associated electronic device to transmit and receive data signals in a USB two channel format, and

means to directly modulate the received USB-format signals onto an optical carrier, and to extract USB-format modulated signals from an optical carrier;

transmission means for transmitting an alert signal to a cooperating transceiver;

wherein the transmission means comprises a pulsed light emitting diode;

three pairs of optical transmitters and sensors,

wherein two of the pairs are used for duplex operation in the two-channel USB format, and the third pair is used for exchange of the alert and control signals.

20. A method for coupling a USB port of a first electronic device to a USB channel of a second electronic device via an optical communications link, said method comprising:

enabling an electronic device to each transmit and receive data signals in a USB two channel format by (a) modulating USB two channel-format signals onto a pair of optical carriers and (b) by extracting USB two channel-format modulated signals from a pair of optical carriers.

21. A method as in claim 20 further comprising harmonizing configurations of two coupled devices on the same USB data rate by:

detecting a configuration of a connected electronic device,

generating data in accordance with the detected configuration,

detecting an idle period in the transmitted and received data signals, and

transmitting the generated configuration data over the optical carriers during said idle period.

22. A method as in claim 21 wherein the configuration data relates to the data rate at which the electronic device is to operate.

23. A method as in claim 20 further comprising harmonizing configurations of two coupled devices on the same USB data rate by:

detecting an idle period in the transmitted and received data signals,

receiving configuration data over the optical carriers during said idle periods, and

configuring an electronic device according to the configuration data.

24. A method as in claim 20 further comprising transmitting an alert signal to a co-operating transceiver.

25. A method as in claim 20 further comprising:

detecting an alert signal indicative that a co-operating transceiver is present.

26. A method as in claim 20 using time division duplex operation with a co-operating transceiver.

27. A method as in claim 26 further comprising synchronizing duplex operation of the USB signals by:

transmitting a control signal for controlling operation of a co-operating transceiver,

operating in receiving mode for a predetermined period after transmission of the control signal,

detecting signals received from the co-operating transceiver, and

switching to transmit mode if no such signals are detected.

28. A method as in claim 26 further comprising synchronizing duplex operation of the USB signals by:

detecting a control signal from a co-operating transceiver, and

putting the transceiver into transmit mode in response to the control signal.

29. A method as in claim 20 further comprising:

incorporating said optical link in a docking port for connection to a complementary docking port having a corresponding transceiver associated with alignment means arranged such that plural optical interfaces in one transceiver are aligned with respectively corresponding plural optical interfaces in a corresponding further transceiver so as to minimize interference between corresponding plural optical communication channels, and from external light sources.

30. A method as in claim 20 further comprising connecting an optically linked electronic device to a storage device via communications network.

31. A method as in claim 20 further comprising:

processing payment for use of one of said electronic devices operating as a terminal for connection to a communications network.

32. A method for coupling a USB port of a first electronic device to a USB channel of a second electronic device via an optical communications link, said method comprising:

enabling an electronic device to each transmit and receive data signals in a USB two channel format by (a) modulating USB-format signals onto an optical carrier and (b) by extracting USB-format modulated signals from an optical carrier;

using three pairs of optical transmitters and sensors,

wherein two of the pairs are used for duplex operation in the two-channel USB format, and the third pair is used for exchange of alert and control signals.