JPH0583258A - Local area network - Google Patents

Abstract

PURPOSE:To allocate plural data processors to one channel by using a leakage coaxial cable, and also, to eliminate the constraint of an installation place of the processor. CONSTITUTION:A repeating installation 1 is connected to a leakage coaxial cable 7 through a coaxial cable 51 and a connector 61. The cable 7 is extended and provided on the floor or the ceiling, and the other end thereof is connected to a terminator 10 through a coaxial cable 52. Data processors 31-3n, 81-8n are connected to radio transmitting/receiving equipments 41-4n, 91-9n, and each equipment 4, 9 is placed in accordance with the extended and provided position of the cable 7. The radio transmitting/receiving equipments to which the same channel is allocated are provided in a position separated by a sufficiently longer distance than an arrival distance of a radio wave generated from the cable 7 and a radio wave generated from the radio transmitting/receiving equipments of the same channel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a local area network, and more particularly to a wireless area network.

[0002]

2. Description of the Related Art FIG. 1 shows a conventional wireless local area network. In the figure, reference numeral 1 is a relay device, which is connected to a computer (not shown) that constitutes this local area network by wire, or is connected to another local area network by wire.
A wireless transmission / reception device 2 is connected to the relay device 1, and wirelessly transmits / receives data passing through the relay device 1.

3n are data processing devices constituting this local area network, and are connected to wireless transmission / reception devices 41, 42, ... 4n, and wireless transmission / reception devices 41, 42.
The data communication is performed with other data processing devices or other local area networks via 4n and 2 and the relay device 1. Therefore, in general, wireless transceivers 2, 41, 42 ... 4n
Are located on the same floor. As such a local area network, for example, "ALTAIR" of Motorola, Inc. is known.

[0004]

The conventional local area network as described above is provided in each radio transmitting / receiving device 2, 41, 42.
Since 4n shares the same radio wave space, one data processing device must be assigned to one channel, and in reality the number of channels is limited, so incorporate many data processing devices into this network. I can't.

In consideration of the usage environment, the shadow of a metal cabinet or a bookshelf becomes a blind spot of the radio wave and the radio wave does not reach it.
2… There are restrictions on the installation location of 4n. The present invention has been made to solve such a problem, and by using a leaky coaxial cable, a wireless microcoupling area can be formed along with it, and a plurality of data processing devices can be assigned to one channel. It is also an object of the present invention to provide a local area network in which there is no restriction on the installation location of the data processing device.

[0006]

SUMMARY OF THE INVENTION A local area network of the present invention comprises a leaky coaxial cable extending over an appropriate length, and a data processing device connected to the leaky coaxial cable so that data can be transmitted and received wirelessly. It is characterized by including. Further, it is characterized in that a plurality of leaky coaxial cables are vertically connected via coaxial cables that do not leak radio waves.

[0007]

The leaky coaxial cable is arranged in consideration of the place where the data processing device should be installed and the reaching distance of the leaked radio wave. The wireless transmission / reception device connected to the data processing device is wirelessly coupled to the leaky coaxial cable. Then, data transmission / reception is possible between similar data processing devices, or between this data processing device and the data processing device connected to the leaky coaxial cable by wire.

As long as the leaky coaxial cable is extended to a required place, there is no restriction on the arrangement position of the data processing device due to the blind spot of the radio wave. In addition, reduce the output of the radio wave or form a non-leakage coaxial cable to separate the radio wave space to form multiple microcoupling areas, which allows the same channel to extend in the longitudinal direction of the leaky coaxial cable. It will be repeatedly used along.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings showing the embodiments. FIG. 2 shows an embodiment of the local area network of the present invention. In the figure, reference numeral 1 is a relay device, which is connected to a data processing device (not shown) or another local area network. Repeater 1
Is connected to the coaxial cable 51 and is connected to the leaky coaxial cable 51 via the connector 61.

The leaky coaxial cable is extended to a place necessary as a working space, that is, a floor or a ceiling so as to go around a desk arrangement position. The other end of the leaky coaxial cable is connected to the coaxial cable 52 using a connector 62, and its terminal is connected to the terminator 10.
Connected to.

Reference numerals 31 and 32 ... 3n, 81, 82 ... 8n are data processing devices, and radio transmission / reception devices 41, 42 ... 4n, 91, 92 ... 9n, respectively.
And the wireless transmission / reception devices are arranged according to the extension position of the leaky coaxial cable 7. Wireless transceiver 41,9
The same channel is assigned to a plurality of wireless transceivers, such as channel 1 for 1 and channel 2 for wireless transceivers 42 and 92, and channel n for wireless transceivers 4n and 9n. The transmission / reception device is provided at a position far away from the reach of radio waves emitted from the leaky coaxial cable 7 and radio waves emitted from other radio transmission / reception devices of the same channel.

In the network of the present invention as described above, except that a plurality of data processing devices of the same channel perform independent independent data communication simultaneously, the data processing devices connected to the leaky coaxial cable and the data processing devices are connected to each other. It is possible to perform data communication with a data processing device or a local area network connected to the relay device 1 side.

FIG. 3 shows another embodiment of the present invention.
Two leaky coaxial cables 71, 72 are connected in series with the coaxial cable 53 by connectors 63, 64. Wireless transceivers 41, 42 ... Positions of 4n and wireless transceivers 91, 92 ...
If the position where 9n is arranged is distant, configuring the entire length with a leaky coaxial cable is wasteful in terms of equipment cost, and there is a problem of attenuation of the signal level transmitted through the leaky coaxial cable.

Such an inconvenience can be eliminated by providing a radio wave non-leaking coaxial cable 53 in a portion where it is not necessary to provide a wireless microcoupling area as in the embodiment of FIG. In addition, the presence of the coaxial cable 53 makes the leaky coaxial cable 7
It is possible to prevent radio wave interference in the wireless microcoupling area consisting of 1,72 each.

[0015]

As described above, according to the present invention, one radio channel can be used for a data processing device at a plurality of positions, and therefore a large number of data processing devices can be connected. Moreover, as long as the leaky coaxial cable is installed in the necessary place, there is no restriction in installing the data processing device due to the blind spot of the radio wave.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a conventional wireless local area network.

FIG. 2 is a schematic diagram of a local area network of the present invention.

FIG. 3 is a schematic diagram showing another embodiment of the local area network of the present invention.

[Explanation of symbols]

 31,32… 3n, 81,82… 8n Data processing device 7,71,72 Leakage coaxial cable 53 Coaxial cable

Claims (2)

[Claims] 1. A local area network comprising: a leaky coaxial cable extending over an appropriate length; and a data processing device connected to the leaky coaxial cable so that data can be transmitted and received wirelessly. 2. The local area network according to claim 1, wherein the plurality of leaky coaxial cables are connected in series via the coaxial cables that do not leak radio waves.