System for and method of distributing television, video and other signals

• US 20030140345A1
• Filed: 03/19/2002
• Published: 07/24/2003
• Est. Priority Date: 02/09/2001
• Status: Abandoned Application

• Current Assignee: Quadriga World Limited
• Original Assignee: Quadriga World Limited
• Inventors: Plimmer, Colin D., Jamieson, Ian L., Fisk, Julian B., Austin, Terry A., Garstone, Adam J., Kotak, Kaushik
• Application Number:
  US09/958,881
• Publication Number:
  US 20030140345A1
• Time in Patent Office: Days
• US Class Current: 725/78
• CPC Class Codes: H04L 41/00 Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
• CPC Class Codes: H04L 41/0213 Standardised network management protocols, e.g. simple network management protocol [SNMP]
• CPC Class Codes: H04L 61/2596 Translation of addresses of the same type other than IP, e.g. translation from MAC to MAC addresses
• CPC Class Codes: H04L 61/5014 using dynamic host configuration protocol [DHCP] or bootstrap protocol [BOOTP]
• CPC Class Codes: H04L 63/0272 Virtual private networks
• CPC Class Codes: H04L 63/0428 wherein the data content is protected, e.g. by encrypting or encapsulating the payload
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/611 for multicast or broadcast systems for broadcast or conference H04L12/18; arrangements for broadcast or distribution combined with broadcast H04H20/00; arrangements for broadcast applications with a direct linkage to broadcast information or to broadcast space-time H04H60/00; selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS], H04W4/06
• CPC Class Codes: H04L 65/612 for unicast
• CPC Class Codes: H04L 65/762 at the source reformatting of additional data in video distribution servers H04N21/2355
• CPC Class Codes: H04L 65/764 at the destination reformatting of additional data in video clients H04N21/4355
• CPC Class Codes: H04L 67/12 specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
• CPC Class Codes: H04L 67/52 specially adapted for the location of the user terminal
• CPC Class Codes: H04L 67/55 Push-based network services
• CPC Class Codes: H04L 67/56 Provisioning of proxy services store-and-forward switching systems in data switching networks H04L12/54
• CPC Class Codes: H04L 67/565 Conversion or adaptation of application format or content adding application control or application functional data H04L67/561
• CPC Class Codes: H04L 69/329 in the application layer [OSI layer 7]
• CPC Class Codes: H04L 9/40 Network security protocols
• CPC Class Codes: H04N 21/2143 located in a single building, e.g. hotel, hospital or museum arrangements specially adapted for plural spots in a confined site in broadcast systems H04H20/63; adaptations for transmission by electric cable for domestic distribution in television systems H04N7/106
• CPC Class Codes: H04N 21/2221 being a cable television head-end CATV in broadcast systems H04H20/78
• CPC Class Codes: H04N 21/25891 : being end-user preferences retrieval of video data in a video database based on user preferences G06F16/739; arrangements for recognizing users' preferences H04H60/46; user profiles in network data switching protocols H04L67/306; processing of user preferences or user profiles in wireless networks H04W8/18
• CPC Class Codes: H04N 21/4333 : Processing operations in response to a pause request
• CPC Class Codes: H04N 21/43615 : Interfacing a Home Network, e.g. for connecting the client to a plurality of peripherals home Audio Video Interoperability [HAVI] data switching networks H04L12/2805
• CPC Class Codes: H04N 21/44222 : Analytics of user selections, e.g. selection of programs or purchase activity monitoring of user selections in data processing systems G06F11/34; arrangements for monitoring the user's behaviour or opinions in broadcast systems H04H60/33
• CPC Class Codes: H04N 21/4437 : Implementing a Virtual Machine [VM] virtual machines in general G06F9/45533
• CPC Class Codes: H04N 21/47202 : for requesting content on demand, e.g. video on demand
• CPC Class Codes: H04N 21/4782 : Web browsing , e.g. WebTV
• CPC Class Codes: H04N 21/6402 : Address allocation for clients address allocation in data networks H04L61/50
• CPC Class Codes: H04N 21/6408 : Unicasting
• CPC Class Codes: H04N 21/6581 : Reference data, e.g. a movie identifier for ordering a movie or a product identifier in a home shopping application
• CPC Class Codes: H04N 21/8173 : End-user applications, e.g. Web browser, game
• CPC Class Codes: H04N 21/8543 : using a description language, e.g. Multimedia and Hypermedia information coding Expert Group [MHEG], eXtensible Markup Language [XML] information retrieval of semistructured data, the underlying structure being taken into account, e.g. mark-up language structure data G06F16/80
• CPC Class Codes: H04N 7/106 : for domestic distribution
• CPC Class Codes: H04N 7/108 : the cable being constituted by a pair of wires
• CPC Class Codes: H04N 7/17318 : Direct or substantially direct transmission and handling of requests
• CPC Class Codes: H04N 7/17354 : in an intermediate station common to a plurality of user terminals

Abstract

A system for distributing television/video signals to different locations comprises a server capable of providing digital television/video signals for a plurality of programmes, a plurality of receivers each at a respective one of said locations, and a network connecting the server to the receivers, each receiver being operable to select a required one of the programmes and to communicate the selection to the server, the server being responsive to such a selection to transmit the digital television/video signal for the selected programme over the network addressed to the receiver that selected that programme, and each receiver being responsive to the digital television/video signal that is addressed to that receiver so that point-to-point communication is established from the server to that receiver.

Claims

1. A system for distributing television/video signals to different locations, the system comprising a server capable of providing digital television/video signals for a plurality of programmes, a plurality of receivers each at a respective one of said locations, and a network connecting the server to the receivers, each receiver being operable to select a required one of the programmes and to communicate the selection to the server, the server being responsive to such a selection to transmit the digital television/video signal for the selected programme over the network addressed to the receiver that selected that programme, and each receiver being responsive to the digital television/video signal that is addressed to that receiver so that point-to-point communication is established from the server to that receiver.

2. A system according to claim 1, wherein the different locations are different rooms in a hotel.

3. A system according to claim 1, wherein the different locations are different dwellings in a neighbourhood.

4. A system according to claim 1, wherein a substantial part of a cable run of the network from the server to at least one of the receivers is provided by data grade twisted-pair cable.

5. A system according to claim 4, wherein the twisted-pair cable substantially complies with or exceeds the specification of ANSI/EIA/TIA-568-1991, Category 3.

6. A system according to claim 4, wherein the twisted-pair cable substantially complies with or exceeds the specification of ANSI/EIA/TIA-568-1991, Category 5.

7. A system according to claim 1, wherein a substantial part of a cable run of the network from the server to at least one of the receivers is provided by telephone-grade twisted-pair cable.

8. A system according to claim 7, wherein the twisted-pair cable falls below the specification of ANSI/EIA/TIA-568-1991, Category 3.

9. A system according to claim 7, wherein the twisted-pair cable does not substantially exceed British Telecommunications specification CW 1308, or is of the type known as Category 2 twisted-pair.

10. A system according to claim 7, wherein the twisted-pair cable has a characteristic impedance at 16 MHz substantially higher than 115 Ω

.

11. A system according to claim 7, wherein the twisted-pair cable has less than four twisted pairs.

12. A system according to claim 1, further including a telephone connected by a first splitter to the network adjacent the respective receiver, and a telephone exchange connected by a second splitter to the network remote from the respective receiver.

13. A system according to claim 12 as dependent on claim 7, wherein the telephone is connected by the first splitter to the telephone grade cable, and the telephone exchange is connected by the second splitter to the telephone grade cable.

19. A method of installing a distribution system according to claim 7 for premises having an existing arrangement of telephone cable for a telephone system of the premises, the method including using at least part of the existing arrangement of telephone cable in the network of the distribution system.

20. A system according to claim 1, wherein a substantial part of a cable run of the network from the server to a plurality of the receivers is provided by a conductor arranged to carry the digital television/video signals for those receivers, those signals being provided on respective channels each allocated to a respective one of the receivers, and each receiver being tuned to its respective channel.

21. A system according to claim 20, wherein the conductor is coaxial cable.

22. A system according to claim 21, wherein the coaxial cable is analogue television grade coaxial cable.

23. A system according to claim 21, wherein the coaxial cable has a characteristic impedance of 75 Ω

.

24. A system according to claim 21, wherein the coaxial cable is substantially in accordance with specification RG59 or RG62.

25. A system according to claim 21, wherein each of the plurality of receivers is connected to the coaxial cable via a cable modem whose tuning is preset to the channel allocated to the respective receiver.

26. A system according to claim 21, wherein the server is connected to the coaxial cable via a cable modem that is controlled by the server to place the digital television/video signal for the programme selected for each receiver on the channel allocated to that receiver.

27. A method of installing a distribution system according to claim 12 for premises having an existing arrangement of coaxial cable for distributing analogue television signals in or to the premises, the method including using at least part of the existing arrangement of coaxial cable in the network of the distribution system.

79. A system according to any of claims 69, 74, or 75 and also falling within the scope of claim 1.

14. A receiver for use in a system for distributing television/video signals to different locations, the system comprising a server capable of providing digital television/video signals for a plurality of programmes, the receiver comprising means for enabling connection to the server by means of a network, means for selecting a required one of the programmes, and means for communicating the selection to the server, the receiver being responsive to a digital television/video signal that is transmitted by the server over the network and addressed to that receiver so that point-to-point communication is established from the server to that receiver.

15. A receiver according to claim 14, wherein the receiver is tuned to a given channel.

16. A receiver according to claim 14, further comprising means for converting the digital signals to analogue signals for supply to a picture/sound reproduction means.

17. A receiver according to claim 16, wherein the digital to analogue converting means includes means for decompressing the digital signals.

18. A receiver for use in a system for distributing television/video signals to different locations, the system comprising a server capable of providing digital television/video signals for a plurality of programmes, the receiver comprising a connection to the server via a network, a selector for selecting a required one of the programmes, and a transmitter for communicating the selection to the server, the receiver being responsive to a digital television/video signal that is transmitted by the server over the network and addressed to that receiver so that point-to-point communication is established from the server to that receiver.

28. A method of distributing television/video signals to different locations, the method comprising providing a server capable of providing digital television/video signals for a plurality of programmed, providing a plurality of receivers each at a respective one of said locations, providing a network connecting the server to the receivers, each receiver selecting a required one of the programmes and communicating the selection to the server, the server responding to such a selection and transmitting the digital television/video signal for the selected programme over the network addressed to the receiver that selected that programme, and each receiver responding to the digital television/video signal that is addressed to that receiver so that point-to-point communication is established from the server to that receiver.

29. A method according to claim 28, wherein the transmitting includes transmitting the digital television/video signal over telephone-grade twisted-pair cable.

30. A method according to claim 28, wherein the transmitting includes transmitting the digital television/video signal over coaxial cable on a channel allocated according to the receiver to which the signal is being sent, and each receiver being tuned to its respective channel.

55. A system or method according to any of claims 28, 31, 42, 43, 45, 46, or 47, wherein the different locations are different rooms in a hotel.

31. A networked system comprising a server and a plurality of devices at different locations connected to the server by a network, at least part of the network being provided by a conductor for carrying a plurality of signals between the server and the devices, the signals being multiplexed on the conductor each on a preset channel allocated according to the device so that each device has a respective preset one of the channels.

32. A system according to claim 31, wherein the signals are frequency-multiplexed on the conductor.

33. A system according to claim 31, wherein the signals are phase-multiplexed on the conductor.

34. A system according to claim 31, wherein the signals are digital signals.

35. A system according to claim 31, wherein the conductor is an electrical conductor and the signals are electrical signals.

36. A system according to claim 35, wherein the conductor is a coaxial cable.

37. A system according to claim 36, wherein the coaxial cable is analogue television grade coaxial cable.

38. A system according to claim 36, wherein the coaxial cable has a characteristic impedance of 75 Ω

.

39. A system according to claim 36, wherein the coaxial cable is substantially in accordance with specification RG59 or RG62.

40. A system according to claim 31, wherein the signals are optical signals and the conductor is an optical conductor.

41. A system according to claim 31, wherein the network provides two-way communication between the server and each terminal, the same channel being used for communication from the server to a particular one of the devices as for communication from that device to the server.

42. A method of operation of a networked system comprising a server and a plurality of devices at different locations connected to the server by a network, at least part of the network being provided by a conductor for carrying a plurality of signals between the server and the devices, the method including multiplexing the signals on the conductor each on a preset channel allocated according to the device so that each device has a respective preset one of the channels.

43. A method of operation of a networked system comprising a server and a plurality of devices at different locations connected to the server by a network, at least part of the network being provided by coaxial cable having at least one branch which is divided at a node into at least two sub-branches in a path direction extending away from the server, and a two-way amplifier being provided at the node to amplify/maintain the signal level of signals passing from the sub-branches to the branch in addition to the signal level of signals travelling from the branch to the sub-branches, the method comprising transmitting a signal from at least one of the devices to the server generally at the same time as transmitting a signal from the server to the devices.

44. A method according to claim 43, further comprising transmitting the signals from the server to the devices on different channels allocated according to the device, and transmitting signals from each device to the server on the same channel as is used for transmission from the server to that device.

45. A method of operation of a networked system comprising a server and a plurality of devices at different locations connected to the server by a network, at least part of the network being provided by coaxial cable having at least one branch which is divided at a node into at least two sub-branches in a path direction extending away from the server, and a two-way amplifier being provided at the node to amplify/maintain the signal level of signals passing from the sub-branches to the branch in addition to the signal level of signals travelling from the branch to the sub-branches, the method comprising transmitting the signals from the server to the devices on different channels allocated according to the device, and transmitting signals from each device to the server on the same channel as is used for transmission from the server to that device.

46. A networked system comprising a server and a plurality of devices at different locations connected to the server by a network, at least part of the network being provided by coaxial cable having at least one branch which is divided at a node into at least two sub-branches in a path direction extending away from the server, and a two-way amplifier being provided at the node to amplify/maintain the signal level of signals passing from the sub-branches to the branch in addition to the signal level of signals travelling from the branch to the sub-branches, the system being operable to transmit a signal from at least one of the devices to the server generally at the same time as a signal is transmitted from the server to the devices.

47. A networked system comprising a server and a plurality of devices at different locations connected to the server by a network, at least part of the network being provided by coaxial cable having at least one branch which is divided at a node into at least two sub-branches in a path direction extending away from the server, and a two-way amplifier being provided at the node to amplify/maintain the signal level of signals passing from the sub-branches to the branch in addition to the signal level of signals travelling from the branch to the sub-branches, the system being arranged to transmit the signals from the server to the devices on different channels allocated according to the device, and to transmit signals from each device to the server on the same channel as is used for transmission from the server to that device.

48. A system for distributing television/video/radio/audio signals to different locations, the system comprising means for receiving analogue television or radio signals or for generating analogue video or audio signals, means for converting the analogue signals to digital signals and supplying the digital signals to a server, a plurality of receivers each at a respective one of said locations, and a network connecting the server to the receivers, each receiver including means for converting the digital signals to analogue signals for supply to a picture/sound reproduction means.

49. A system according to claim 48, wherein the analogue to digital converting means includes means for compressing the digital signals to a standard compressed digital format, and each digital to analogue converting means includes means for decompressing the digital signals.

50. A system according to claim 48, wherein the receiving means includes an aerial for receiving modulated terrestrial analogue television/radio signals for a plurality of programmes, and means for demodulating the modulated signal for at least one of the programmes.

51. A system according to claim 48, wherein the receiving means includes a satellite receiver for receiving scrambled and multiplexed satellite analogue television signals for a plurality of programmes, and means for descrambling and demultiplexing the signal for at least one of the programmes.

52. A system according to claim 48, wherein the receiving means includes a satellite receiver for receiving scrambled and multiplexed satellite analogue television signals for a plurality of programmes, means for descrambling and demultiplexing the signal for at least one of the programmes to produce an intermediate signal, means for modulating an RF signal with the intermediate signal, and means for demodulating the modulated RF signal.

53. A system for distributing television/video/radio/audio signals to different locations, the system comprising a reception and production centre for receiving analogue television or radio signals or for generating analogue video or audio signals, a processor for converting the analogue signals to digital signals and supplying the digital signals to a server, a plurality of receivers each at a respective one of said locations, and a network connecting the server to the receivers, each receiver including a digital to analogue convertor for converting the digital signals to analogue signals for supply to an output device.

54. A method of distributing television/video/radio/audio signals to different locations, comprising:

receiving analogue television or radio signals or generating analogue video or audio signals, converting the analogue signals to digital signals, supplying the digital signals to a server, distributing the digital signals over a network to a plurality of receivers each at a respective one of said locations, and, at each receiver, converting the digital signal to an analogue signal and reproducing a picture/sound from the analogue signal.

56. A control system for a television set, comprising a first circuit on at least one first circuit board for receiving a digital video signal from a network and for decoding the digital video signal to produce a decoded video signal for supply to a standard video interface of the television set, the first circuit also being operable to receive control instructions from the network and/or from a user interface and to generate a generic control signal therefrom, the control system further comprising a second circuit provided on at least one second circuit board that is specific to the type of the television set, the second circuit being operable to receive the generic control signal from the first circuit and to convert the generic control signal into a specific control signal for supply to a control interface of the television set so as to control the television set in accordance with the control instructions.

57. A system according to claim 56, wherein said one second circuit board is installed in a slot on a main circuit board of the television set inside the housing of the television set, and said one first circuit board is installed inside a housing distinct from the television set housing.

58. A system according to claim 56, wherein said one first circuit board and said one second circuit board are installed in first and second slots, respectively, on a main circuit board of the television set inside the housing of the television set.

59. A system according to claim 56, wherein said one second circuit board is installed in a first slot on a main circuit board of the television set inside the housing of the television set, and said one first circuit board is installed in a second slot on said one second circuit board or one of the second circuit boards.

68. A method of configuring a control system according to claim 56 for a particular television set, the method comprising selecting, from a collection of such second circuit boards for different types of television sets, a circuit board that is specific to the type of the particular television set, and installing the selected second circuit board in conjunction with such a first circuit board.

60. A combination of a first circuit on at least one first circuit board and a second circuit on at least one second circuit board for controlling a television set, the first circuit having means for receiving a digital video signal from a network and to for decoding the digital video signal to produce a decoded video signal for supply to a standard video interface of the television set, the first circuit further comprising means for receiving control instructions from the network and/or from a user interface and for generating a generic control signal therefrom, the second circuit having means for receiving the generic control signal from the first circuit and for converting the generic control signal into a specific control signal having a different format than the generic control signal, for supply to a control interface of a television set so as to control the television set in accordance with the control instructions.

61. A combination according to claim 60, wherein both said one first circuit board and said one second circuit board have means for installation in respective first and second slots on a main circuit board of the television set.

62. A combination according to claim 60, wherein said one second circuit board has means for installation in a first slot on a main circuit board of the television set, and said one first circuit board has means for installation in a second slot on said one first circuit board or one of the first circuit boards.

63. A combination of a first circuit on at least one first circuit board and a second circuit on at least one second circuit board for controlling a television set, the first circuit having a first receiver for receiving a digital video signal from a network and for decoding the digital video signal to produce a decoded video signal for supply to a standard video interface of the television set, the first circuit further comprising a processor for receiving control instructions from the network and/or from a user interface and for generating a generic control signal therefrom, the second circuit having a second recciver for receiving the generic control signal from the first circuit and for converting the generic control signal into a specific control signal having a different format than the generic control signal, for supply to a control interface of a television set so as to control the television set in accordance with the control instructions.

64. A range of circuit boards for controlling a television set, each circuit board of the range comprising means for connection to a generic circuit board, each circuit board of the range comprising means for receiving a generic control signal, based on control instructions received from a network and/or from a user interface, from the generic circuit board, and means for converting the generic control signal into a specific control signal having a different format than the generic control signal, and means for supplying the specific control signals to a control interface of the television set so as to control the television set in accordance with the control instructions.

65. A range of circuit boards according to claim 64, wherein the formats of the specific control signals are all different for different control boards of the range.

66. A range of circuit boards according to claim 64, wherein each circuit board of the range has a slot for installation of the generic circuit board therein.

67. A range of circuit boards for controlling a television set, each circuit board of the range comprising a connection to a generic circuit board, each circuit board of the range comprising a receiver for receiving a generic control signal, based on control instructions received from a network and/or from a user interface, from the generic circuit board, and a processor for converting the generic control signal into a specific control signal having a different format than the generic control signal, and for supplying the specific control signals to a control interface of the television set so as to control the television set in accordance with the control instructions.

69. A networked system comprising a server and a plurality of devices connected to the server by a network, the network including, adjacent each device, a releasable connector having a first connector part connected to the respective device and a second connector part connected to the remainder of the network, each device having a respective device address, each second connector part having a respective connector address, the server storing the device addresses and, for each device address a corresponding connector address, and each device being operable to:

—

(a) supply its device address to the server and requesting the corresponding connector address, (b) receive the corresponding connector address from the server, (c) request the connector address from the respective connector, (d) receive the connector address from the connector, (e) compare the connector addresses received from the server and the connector, and (f) perform different processes in dependence upon whether or not the compared addresses match.

70. A system according to claim 69, wherein each device is operable to:

—

(a) supply its device address to the server and requesting the corresponding connector address, (b) receive the corresponding connector address from the server, (c) request the connector address from the respective connector, (d) receive the connector address from the connector, (e) compare the connector addresses received from the server and the connector, and (f) perform different processes in dependence upon whether or not the compared addresses match upon powering-up of the device.

71. A system according to claim 70, wherein each device is operable, if the compared addresses do match, to power-up to a fully-operational state.

72. A system according to claim 70, wherein each device is operable, if the compared addresses do not match, to power-up to a partly-operational state.

73. A system according to claim 69, wherein each device is operable, if the compared addresses do not match, to notify the server that the compared addresses do not match.

74. A networked system comprising a server and a plurality of devices connected to the server by a network, the network including, adjacent each device, a releasable connector having a first connector part connected to the respective device and a second connector part connected to the remainder of the network, each device having a respective connector address, the system comprising means for storing the device addresses and, for each device address, a corresponding connector address, and means for comparing, for a given device address, whether the stored corresponding connector address matches the connector address of the second connector part adjacent the device, the system being arranged to perform different processes depending on the result of the comparison.

76. A networked system according to claims 74 or 75, wherein the comparing means forms part of the server.

75. A networked system comprising a server and a plurality of devices connected to the server by a network, the network including, adjacent each device, a releasable connector having a first connector part connected to the respective device and a second connector part connected to the remainder of the network, each device having a respective connector address, the system comprising means for storing the device addresses and, for each device address, a corresponding connector address, and means for comparing, for a given second connector part, whether the stored corresponding device address matches the device address of the device adjacent the second connector part, the system being arranged to perform different processes depending on the result of the comparison.

77. A networked system comprising a server and a plurality of devices connected to the server by a network, the network including, adjacent each device, a releasable connector having a first connector part connected to the respective device and a second connector part connected to the remainder of the network, each device having a respective connector address, the system comprising a memory for storing the device addresses and, for each device address, a corresponding connector address, and a processor for comparing, for a given device address, whether the stored corresponding connector address matches the connector address of the second connector part adjacent the device, the system being arranged to perform different processes depending on the result of the comparison.

78. A networked system comprising a server and a plurality of devices connected to the server by a network, the network including, adjacent each device, a releasable connector having a first connector part connected to the respective device and a second connector part connected to the remainder of the network, each device having a respective connector address, the system comprising a memory for storing the device addresses and, for each device address, a corresponding connector address, and a processor for comparing, for a given second connector part, whether the stored corresponding device address matches the device address of the device adjacent the second connector part, the system being arranged to perform different processes depending on the result of the comparison.

80. A method of operation of a device in a networked system comprising a server and a plurality of such devices connected to the server by a network, the network including, adjacent each device, a releasable connector having a first connector part connected to the respective device and a second connector part connected to the remainder of the network, each device having a respective device address, each second connector part having a respective connector address, and the server storing the device addresses and, for each device address a corresponding connector address, the method comprising (a) the device supplying its device address to the server and requesting the corresponding connector address, (b) the device receiving the corresponding connector address from the server, (c) the device requesting the connector address from the respective connector, (d) the device receiving the connector address from the connector, (e) the device comparing the connector addresses received from the server and the connector, and (f) the device performing different processes in dependence upon whether or not the compared addresses match.

81. A method of operation of a networked system comprising a server and a plurality of devices connected to the server by a network, the network including, adjacent each device, a releasable connector having a first connector part connected to the respective device and a second connector part connected to the remainder of the network, each device having a respective connector address, the method comprising (a) storing pairs of addresses, wherein each pair comprises a device address and a corresponding connector address, (b) comparing, for a given device address, whether the stored corresponding connector address matches the connector address of the second connector part adjacent the device, and (c) performing different processes depending on the result of the comparison.

83. A method according to claim 81 or 82, wherein the addresses are compared by the server.

82. A method of operation of a networked system comprising a server and a plurality of devices connected to the server by a network, the network including, adjacent each device, a releasable connector having a first connector part connected to the respective device and a second connector part connected to the remainder of the network, each device having a respective device address, the method comprising (a) storing pairs of addresses, wherein each pair comprises a device address and a corresponding connector address, (b) comparing, for a given second connector part, whether the stored corresponding device address matches the device address of the device adjacent the second connector part, and (c) performing different processes depending on the result of the comparison.

84. A device for use in a networked system comprising a server and a plurality of such devices connectable to the server by a network via respective connectors, the device having a respective device address, the device comprising (a) means for supplying its device address to the server and requesting a corresponding connector address stored in the server, (b) means for receiving the corresponding connector address from the server, (c) means for requesting the connector address from a connector for the device, (d) means for receiving the connector address from the respective connector, (e) means for comparing the connector addresses received from the server and the connector, and (f) means for performing different processes in dependence upon whether or not the compared addresses match.

85. A device according to claim 84, wherein the device comprises means for performing the functionality of the elements (a) to (f) upon powering up.

86. A device according to claim 85, wherein the device has means for powering-up to a fully-operational state if the compared addresses do match.

87. A device according to claim 85, wherein the device has means for powering-up to a partly-operational state if the compared addresses do not match.

88. A device according to claim 84, wherein the device has means for notifying the server that the compared addresses do not match if the compared addresses do not match.

89. A device for use in a networked system comprising a server and a plurality of such devices connectable to the server by a network via respective connectors, the device having a respective device address, the device comprising (a) a transmitter for supplying its device address to the server and requesting a corresponding connector address stored in the server, (b) a receiver for receiving the corresponding connector address from the server, (c) an output device for requesting the connector address from a connector for the device, (d) an input device for receiving the connector address from the respective connector, (e) a comparator for comparing the connector addresses received from the server and the connector, and (f) a processor for performing different processes in dependence upon whether or not the compared addresses match.