JP2010081355A - Information transfer system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system to which an existent general GPS (Global Positioning System) receiver can be applied and which transfers information obtained by the GPS receiver to each device without reducing LAN throughput. <P>SOLUTION: An information transfer system 10 includes: a GPS receiver 12 receiving radio waves from a GPS satellite; a plurality of devices 16 and 18 to communicate with each other via a plurality of cables 22 and 24 having core wires; and an adapter 14. The system supplies information acquired by the GPS receiver 12 through the adapter 14 to a core wire that is not utilized for communication between the devices 16 and 18, thereby transferring the information of the GPS receiver without reducing LAN throughput. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an information transmission system, and more particularly to a transmission system for a clock signal generated based on a radio wave received from a GPS (Grobal Positioning System) satellite.

  In general, wireless communication systems such as CDMA (Code Division Multiple Access) and WiMAX (Worldwide Interoperability for Microwave Access) are equipped with a GPS antenna and GPS receiver in the system, and receive GPS signals emitted from GPS satellites. The base station receives the signal and converts it into a pulse signal, and a plurality of base stations are synchronized based on this signal.

For example, Patent Document 1 discloses a method of using a LAN (Local Area Network) cable as means for connecting a GPS receiver and a device that synchronizes based on a pulse signal obtained from the GPS receiver. According to this method, a GPS receiver and a GPS data processing device are connected using an Ethernet (registered trademark) -compatible LAN interface, and information for controlling the GPS receiver and GPS positioning information are transmitted and received. As a result, the LAN cable can be saved at the time of LAN construction.
JP 2002-48856 A

  However, since the GPS receiver needs to have a LAN interface in the method disclosed in Patent Document 1, if the receiver already used uses, for example, an RS-232C communication port, the LAN interface is used. It is necessary to replace it with a receiver equipped with GPS, and it is necessary to packetize information acquired from GPS satellites with the GPS receiver.

  Further, since the GPS receiver control information and the information acquired from the GPS satellite are transmitted to the LAN as packets, the bandwidth of other data communication is compressed, and the LAN throughput is reduced.

  In view of such problems, the present invention aims to provide a system capable of diverting an existing GPS receiver and transmitting GPS information without reducing the throughput of the LAN. And

  In order to achieve such an object, an information transmission system of the present invention is connected to a first cable including a plurality of core wires and communicates with a second device via a part of the plurality of core wires. 1 apparatus, a receiving apparatus for receiving a signal including predetermined information, and obtaining the predetermined information from the receiving apparatus, and placing the predetermined information on a core different from the core used for communication of the first cable. Includes adapter to supply.

  According to the present invention, since an existing GPS receiver that does not have a LAN interface can be used, the cost can be reduced. In addition, the receiver does not need to packetize the acquired information, and a reduction in processing efficiency can be avoided. Furthermore, since the acquired information is transmitted using the free terminal of the cable, it is possible to avoid a decrease in LAN throughput.

  Next, embodiments of the information transmission system according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a diagram showing a configuration of an embodiment of an information transmission system according to the present invention. The information transmission system 10 according to the present embodiment includes a receiver 12, an adapter 14, devices 16 and 18, and cables 20, 22, and 24. The device 18 is based on time information supplied from a GPS satellite or the like. It is a device that takes synchronization. Elements that are not directly related to the understanding of the present invention are omitted to avoid redundant description. In the following description, the signal is indicated by the reference number of the connection line in which the signal appears.

  Such an information transmission system can use an existing GPS receiver that does not have a LAN interface. The time information transmission system will be described below, but the present invention is not limited to this, and may be other information such as position information.

  The receiver 12 receives a radio wave 26 including time information such as a GPS satellite and generates a clock signal 20, and is connected to the adapter 14 by a cable 20. The receiver 12 may be a known one, and the cable 20 may be, for example, a coaxial cable or an RS232C cable. The receiver 12 passes the clock signal 20 to the adapter 14.

  The adapter 14 connects the receiver 12, the device 16, and the device 18. In this embodiment, the adapter 14 sends the clock signal 20 supplied from the receiver 12 to the device 18. Here, the device 16 and the device 18 are connected to the adapter 14 by cables 22 and 24, respectively, and transmit / receive data to / from each other. Both the cables 22 and 24 are cables having multi-core wires. In the present embodiment, the cables 22 and 24 are eight-core four-pair twisted pair cables, of which some core wires are used for communication between the devices 16 and 18, but at least a pair of core wires are not used. Hereinafter, a core wire that is not used for communication between the devices 16 and 18 is referred to as an unused core wire.

  The configuration of the adapter 14 of this embodiment will be described in detail with reference to FIG. In this embodiment, adapter 14 includes connectors 27, 28 and 30. The cable 20 is connected to the connector 27, and the cables 22 and 24 are connected to the connectors 28 and 30, respectively. Each connector may have a signal amplification function as required. Each of the connectors 28 and 30 has a plurality of pins corresponding to the cables 22 and 24 having a plurality of core wires. The connectors 28 and 30 may be known connectors, and in this embodiment are RJ-45 connectors (ISO international standard) having eight pins. FIG. 3 shows the pin arrangement of the connector 28. Connector 28 has eight pins 31, 32, 33, 34, 35, 36, 37 and 38. Connector 30 has eight pins 39, 40, 41, 42, 43, 44, 45 and 46 corresponding to pins 31, 32, 33, 34, 35, 36, 37 and 38 of connector 28, respectively. In this embodiment, the connector 30 and the cable 24 are connected, so that the pins 45 and 46 of the connector 30 are connected to a set of unused core wires of the cable 24. The other pins of the connectors 28 and 30 may be connected to the corresponding core wires of the cables 22, 24 by connecting the connectors 28, 30 and the cables 22, 24, respectively, or connected if not necessary. It does not have to be. Pins 31, 32, 33, 34, 35, 36, 37 and 38 of connector 28 and pins 39, 40, 41, 42, 43, 44, 45 and 46 of connector 30 are connected lines 48, 50, 52, 54, 56, 58, 60 and 62 are connected.

  The connector 27 generates signals 64 and 66 from the clock signal 20 and supplies them to a desired connection line between the connectors 28 and 30. In the example shown in FIG. 2, connector 27 passes signals 64 and 66 to connection lines 60 and 62, respectively, to supply device 18. The connector 27 need only supply the clock signal 20 as it is to one connection line depending on the types of the cables 22 and 24.

  Here, when the device 18 cannot normally receive the signals 64 and 66 due to the attenuation of the signals 64 and 66 and the generation of noise, the device 18 transmits an error message to the device 16 and the device 16 Time information may be acquired. In this case, the device 16 may acquire time information in the same manner as the device 18, and the device 18 calculates a delay time generated by acquiring the time information via the device 16, and acquires the acquired time. Information may be corrected.

  When the adapter 14 supplies time information to three or more devices, it can be handled by increasing the number of connectors connected to the connector 27.

  Next, an information transmission procedure in the information transmission system 10 of the present invention will be specifically described. First, the radio wave 26 is received by the receiver 12, and the clock signal 20 is generated based on the electromagnetic wave 26. The clock signal 20 is supplied to the adapter 14, converted into signals 64 and 66 by the connector 27, and supplied to the connection lines 60 and 62. Clock signals 64 and 66 are sent to device 18.

  FIG. 4 conceptually shows another example of the time information transmission system according to the present invention. In the time information transmission system 100 shown in FIG. 4, a clock signal is transmitted without using an adapter. 4, the same reference numerals as those in FIG. 1 denote the same components.

  In the example shown in FIG. 4, the clock signal 20 from the receiver 12 is passed to the device 16. More specifically, receiver 12 and device 18 are connected to device 16 via cables 20 and 22, respectively, and device 18 receives the clock signal generated by receiver 12 via device 16.

  The configuration of the device 16 will be described in detail with reference to FIG. 5, the same reference numerals as those in FIG. 2 denote the same components. The 16 device includes connectors 27 and 68, which include pins 70 and 72 that connect the pair of unused core wires of the cable 22 by connecting the cable 22 and the connector 68. Connector 27 receives clock signal 20, generates signals 64, 66, supplies them to pins 70 and 72 of connector 68, and passes clock signals 64, 66 to device 18.

  Next, a procedure for transmitting the clock signal 20 in the information transmission system 100 of the present invention will be specifically described. The clock signal 20 generated by the receiver 12 is supplied to the device 16 and converted into signals 64 and 66 at the connector 27, and the signals 64 and 66 are supplied to pins 70 and 72 via the unused core wires of the cable 22. Is supplied to the device 18.

It is a block diagram which shows the structure of the Example of the information transmission system by this invention. It is a figure which shows the concept of the internal connection of the adapter in the system shown in FIG. It is a figure which shows an example of the pin arrangement of the connector of the adapter shown in FIG. It is a block diagram which shows the structure of the other Example of the information transmission system by this invention. It is a figure which shows the concept of the internal connection of the apparatus connected to the receiver in the system shown in FIG.

Explanation of symbols

10 Information transmission system
12 Receiver
14 Adapter
16 equipment
18 Equipment

Claims (6)

A first device connected to a first cable including a plurality of core wires and communicating with a second device via a part of the plurality of core wires;
A receiving device for receiving a signal including predetermined information;
An information transmission system comprising: an adapter for acquiring the predetermined information from the receiving device and supplying the predetermined information to a core wire different from the partial core wire of the first cable. A first device and a second device connected via a first cable including a plurality of core wires and communicating via a part of the plurality of core wires;
A receiving device for receiving a signal including predetermined information,
The first device acquires the predetermined information from the receiving device, and supplies the predetermined information to a core wire different from the partial core wire of the first cable.   3. The information transmission system according to claim 1, wherein the first cable is a UTP (Unshielded Twisted Pair) cable or an STP (Shielded Twisted Pair) cable.   3. The information transmission system according to claim 1, wherein the signal including the predetermined information is supplied from a GPS (Global Positioning System) satellite.   3. The information transmission system according to claim 1, wherein the predetermined information is time information.   3. The information transmission system according to claim 1, wherein the predetermined information is position information.

Images