JP3602260B2 - LAN equipment direct connection cable - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cable directly connecting LAN devices such as computers in a LAN (Local Area Network) and routers in a WAN (Wide Area Network), and is particularly easy to handle and connect to a serial cable. Also, the present invention relates to a direct connection cable of a LAN device having a high data transfer rate such as about 10BASE-5 LAN cable.
[0002]
[Prior art]
Recently, with the improvement of computer technology and communication technology, LANs and WANs that connect a plurality of computers via a network and perform information processing while exchanging information with each other, thereby performing highly efficient processing as a whole have been widely used. Became.
[0003]
The information processing devices (including computers and routers, here called LAN devices) in the LAN and WAN are connected so as to be able to exchange data with each other, but the connection method for directly connecting the two LAN devices is a serial cable method, a LAN method. And MPT (Multi Port Transceiver) type.
[0004]
FIG. 3 shows the serial cable system, the LAN system, and the MPT system.
[0005]
FIG. 3A shows a connection using a serial cable system. The connection by the serial cable method is to directly connect a pair of routers R1 and R2 by a serial cable 20, as shown in FIG.
[0006]
According to the connection of LAN devices by this method, information is exchanged between routers via the serial cable 20. The serial cable 20 has a multi-core structure, and data is transmitted independently for each core wire.
[0007]
The serial cable 20 can be of any length, and can be connected by inserting the connectors 20a, 20b at both ends into the connection ports of the serial ports of the routers R1 and R2.
[0008]
Therefore, according to this serial cable system, it is easy to handle the connection of the cable and the like, and it is only necessary to lay the necessary minimum length of the cable. Can be.
[0009]
It is generally considered that the reliability of the connection of a LAN device is higher as the number of contacts (referred to as the number of connection points that may be disconnected) is smaller. As shown in FIG. 3A, there are only two points of contact between the device and the serial cable, point a and point b. For this reason, it can be said that the connection of the serial cable LAN device has the maximum reliability in terms of reliability.
[0010]
However, the connection of the LAN device by the serial cable method has a disadvantage that the data transfer speed is low. The data transfer speed of a normal serial cable is about 192 Kbps (Kilo Bit per second).
[0011]
On the other hand, FIG. 3B shows connection of LAN devices by the LAN method.
[0012]
In the connection by the LAN method, transceivers 22 and 23 are attached to predetermined positions of a LAN cable 21, and these transceivers are connected to routers R 1 and R 2 by AUI cables 24 and 25, respectively.
[0013]
The LAN cable 21 can transfer data at a high speed of 10 Mbps (Mega Bit per second).
[0014]
However, the LAN cable 21 is cut to an integral multiple of 50 m and has a length of 50 m to 500 m as a construction practice in order to prevent interference of a terminal reflected wave when transmitting data at a high speed of 10 Mbps.
[0015]
For this reason, even when the required length of the LAN cable is less than 50 m, the surplus cable has to be stored in a space such as under the floor.
[0016]
In addition, when the LAN cable 21 transceivers 22 and 23 are attached or the cable is branched, a connection work is required.
[0017]
As shown in FIG. 4, the 10BASE-5 LAN cable 21 has a core wire 26 at the center, an insulator 27 around the core wire, a mesh-like conductor 28 outside the core wire 26, and an insulation coating 29 outside the core wire 26. It has a structure.
[0018]
In order to connect a transceiver to the LAN cable 21, it is necessary to connect the core wire 26 and the core wire 26 'and the mesh-shaped conductor 28 and the conductor 28' in a state insulated from each other as shown in FIG.
[0019]
For this reason, it was not easy for everyone to connect when needed.
[0020]
In addition, in the connection using the LAN method, the connection state shown in FIG. 3B has six contacts c1 to c6 as a whole, and the reliability is reduced. There is also a system in which the main bodies of the transceivers 22 and 23 and the AUI cables 24 and 25 are integrated with each other so that the contacts of C1 and C3 are eliminated. However, even in this case, there are four contacts in total.
[0021]
Finally, connection of the MPT method will be described.
The MPT connection was developed to overcome the shortcomings of the LAN system, and eliminates the influence of the end point reflected wave by means of resistance, etc., and realizes a LAN cable that is virtually an integral multiple of 50 m in length. The multiport transceiver 30 is used. The multi-port transceiver 30 has a plurality of ports (connection ports) 31 in the main body, and further has a transceiver function.
[0022]
In the connection of the MPT system, the multiport transceiver 30 is installed, for example, on a part of the floor, and the routers R1, R2 to be connected and the multiport transceiver 30 are connected by AUI cables 32, 33.
[0023]
According to this method, data can be transferred at a speed of 10 Mbps within the multiport transceiver 30, and a space for accommodating a redundant cable as compared with a LAN cable is not required. Further, the connection state shown in FIG. 3C has four contacts d1 to d4 as a whole, and the reliability is lower than that of the serial cable system, but higher than that of the LAN system connection.
[0024]
It should be noted that the AUI cable can transfer data at a speed of 10 Mbps, but cannot directly connect LAN devices according to the standard.
[0025]
[Problems to be solved by the invention]
However, it is inconvenient to directly connect two LAN devices by any of the above connection methods. It is often necessary to directly connect such two LAN devices in a WAN or LAN environment.
[0026]
For example, in a three-station WAN configuration, a three-station configuration as shown in FIG. 5 is generally employed. This is to ensure a data communication path even for a single failure of a node and a line.
[0027]
As shown in FIG. 5, in a store A, a store B, and a store C having a three-station configuration, each of the stores A, B, and C has two routers R, and is connected to the other two stores through the routers. are doing.
[0028]
According to the three-station configuration, for example, if a failure occurs in the first route 34 between the store A and the store C, the store A transfers data to the store C via the second route 35, that is, the store B. can do.
[0029]
In this case, as the data transfer path in the store B, the LAN 36 in the store B can be used. However, usually, both routers in the store B are connected to the cable 37 so as not to affect the closed communication in the store B. And the cable 37 is used as a data transfer path.
[0030]
The cable connection between the routers is a connection between a pair of LAN devices. Conventionally, any one of the above-described serial cable system, LAN system, and MPT system has to be used as the connection system.
[0031]
However, in the case of using the connection of the serial cable system, there is an advantage that the storage space for the cable is small and the connection is easy, but there is a disadvantage that the data transfer speed is reduced.
[0032]
On the other hand, when the LAN connection is adopted for the connection between the routers, there is an advantage that the data transfer speed is high, but a LAN cable of 50 m to 500 m must be laid to connect the two routers. There were drawbacks. Also, the connection work for that was not easy.
[0033]
When the MPT connection is adopted as the connection between the routers, there is an advantage that the data transfer speed is high and the connection is simple. However, the price of the device is high and two out of many ports are required. There is a drawback that only one can be used.
[0034]
As described above, none of the conventional LAN device connection methods is perfect. In addition, the need to connect a pair of LAN devices is high, not limited to the case of the above-mentioned WAN, and development of a connection method or connection means suitable for this purpose has been awaited.
[0035]
Therefore, an object of the present invention is to provide a highly reliable LAN device directly connected cable that has a high data transfer speed, is easy to connect and store, and has high reliability.
[0036]
[Means for Solving the Problems]
The cable directly connected to a LAN device according to claim 1 of the present application has a terminating resistor at both ends, and a portion between the transceivers of a high-speed data transfer body provided with a pair of transceivers at an intermediate portion is a connector portion of an AUI cable for LAN device connection. It is characterized by being provided in.
[0037]
The LAN device direct connection cable according to claim 2 of the present application is
A high-speed data transfer device having a terminating resistor at both ends and a pair of transceivers at an intermediate portion, wherein a portion between the transceivers is interposed in any part of a LAN device connection AUI cable. It is.
[0039]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described below.
FIG. 1 shows an embodiment of a cable directly connected to a LAN device according to the present invention.
[0040]
In FIG. 1, a LAN device direct connection cable 1 has connectors 4 and 5 connected to LAN devices (two routers 2 and 3 in this embodiment) at both ends.
[0041]
The connector section 4 has a connector 6 having a multi-pin structure connectable to a LAN port of the router 2. A plurality of core wires 7 similar to the AUI cable extend from the connector 6 to the connector section 5 through the cable body.
[0042]
The connector section 5 includes a connector 8 connectable to the LAN port of the router 3, a plurality of core wires 9 similar to an AUI cable connected to the connector 8, and a high-speed data transfer body having terminal resistors 10a and 10b at both ends. 11 are built in.
[0043]
A pair of transceivers 12a and 12b are provided on the high-speed data transfer body 11, and the other ends of the plurality of core wires 7 and 9 are connected to the transceivers 12a and 12b.
[0044]
The high-speed data transfer body 11 can transfer information at a speed of 10 Mbps, similarly to a LAN cable. The terminating resistors 10a and 10b provided at both ends of the high-speed data transfer body 11 cancel the influence of the terminal reflected wave when transmitting information at a high frequency, so that the high-speed data transfer body 11 has a very short length and is virtually virtual. A function equivalent to that of a LAN cable having a length that is an integral multiple of 50 m is realized.
[0045]
The transceivers 12a and 12b convert the signals transferred by the multi-core wires 7 and 9 into high-frequency signals, or conversely, convert the signals transferred by the high-speed data transfer body 11 into signals for the multi-core wires 7 and 9. Convert.
[0046]
Since the high-speed data transfer body 11 and the transceivers 12a and 12b are simple in structure, the connector section 5 containing them is actually slightly larger than a normal cable connector.
[0047]
According to the LAN device directly connected cable 1, the data transfer between the two LAN devices is performed by the high-speed data transfer body 11, so that the data can be transferred at a speed of 10 Mbps.
[0048]
Further, since the length can be adjusted at the portion of the AUI cable (a plurality of core wires 7), the length can be made necessary and sufficient according to the distance between the routers 2 and 3. Therefore, there is no need to store a cable having a length that is an integral multiple of 50 m, such as a LAN cable. Further, unlike the MPT method, there is no useless port, and efficient equipment investment can be performed in combination with a low price.
[0049]
Although the connector section 5 is slightly larger than a normal cable connector, if the connector sections 4 and 5 at both ends are inserted into the LAN port of the LAN apparatus as in the case of the serial cable, the LAN apparatus can be easily connected. it can. Therefore, no special construction is required for the connection.
[0050]
Furthermore, according to the LAN device direct connection cable 1, since the contacts around the high-speed data transfer body 11 in the connector section 5 are extremely reliable, the number of contacts that can be dropped is as shown by points m and n shown in FIG. Since the number of contacts is limited to two, a connection with high reliability in terms of the number of contacts can be obtained.
[0051]
In the above embodiment, the high-speed data transfer body 11 is provided at the connector portion at one end of the LAN device direct connection cable 1. However, according to the present invention, the high-speed data transfer is performed to any part of the AUI cable connecting both LAN devices. What is necessary is just to provide the high-speed data transfer body which performs. In accordance with this idea, a modified example will be described below.
[0052]
FIG. 2 shows an example in which a high-speed data transfer body for performing high-speed data transfer is provided in the middle of an AUI cable.
[0053]
The LAN device direct connection cable 13 shown in FIG. 2 is connected to a normal AUI cable 14 with a high-speed data transfer body storage unit 15 interposed therebetween. A high-speed data transfer body 17 having terminating resistors 16a and 16b at both ends is provided inside the high-speed data transfer body housing unit 15, as in the embodiment already described with reference to FIG. A pair of transceivers 18a and 18b are provided on the high-speed data transfer body 17, and the core of the AUI cable 14 is connected to the transceivers 18a and 18b.
[0054]
The operation and effect of the LAN device directly connected cable 13 are exactly the same as those of the high-speed data transfer body 11 of the above-described embodiment, and therefore detailed description is omitted. -It should be mentioned that the connection operation is extremely simple and that a highly reliable connection can be obtained.
[0055]
【The invention's effect】
As is apparent from the above description, the LAN device direct connection cable according to the present invention is connected to a part of the AUI cable connecting the LAN devices via a high-speed data transfer body. This high-speed data transfer body has terminating resistors at both ends, and is configured to exhibit a high-speed data transfer performance equivalent to that of a LAN cable having a length that is virtually an integral multiple of 50 m due to its short length.
[0056]
Therefore, according to the cable directly connected to the LAN device of the present invention, data can be transferred at a high speed between the two LAN devices, and the handling, storage, and connection of the cable become extremely simple. Also, there is no need for expensive equipment investment unlike the MPT method. This makes it possible to provide a direct connection cable that is extremely convenient for directly connecting a pair of LAN devices.
[Brief description of the drawings]
FIG. 1 is a configuration diagram conceptually showing a LAN device direct connection cable according to the present invention in which a high-speed data transfer body is provided in one connector section.
FIG. 2 is a configuration diagram conceptually showing a LAN device direct connection cable according to the present invention in which a high-speed data transfer body is provided in the middle of an AUI cable.
FIG. 3 is a configuration diagram conceptually showing a conventional connection method for LAN devices.
FIG. 4 is a partial cross-sectional view showing a configuration of a connection portion of a LAN cable.
FIG. 5 is an explanatory diagram conceptually showing a communication path when a single failure of the communication path occurs in a WAN having a three-station configuration.
[Explanation of symbols]
1 LAN equipment direct connection cable 2 Router 3 Router 4 Connector part 5 Connector part 6 Connector 7 Multiple core wire 8 Connector 9 Multiple core wire 10a Terminating resistor 10b Terminating resistor 11 High speed data transfer body 12a Transceiver 12b Transceiver 13 LAN device direct connecting cable 14 AUI cable 15 High speed Data transfer body storage section 16a Terminating resistor 16b Terminating resistor 17 High-speed data transfer body 18a Transceiver 18b Transceiver

Claims (2)

A cable directly connected to a LAN device, wherein a portion between the transceivers of a high-speed data transfer body having a terminating resistor at both ends and a pair of transceivers at an intermediate portion is provided in a connector portion of an AUI cable for connecting a LAN device. . A LAN having a terminating resistor at both ends and a portion between the transceivers of a high-speed data transfer body having a pair of transceivers at an intermediate portion in any part of a LAN device connection AUI cable. Equipment direct connection cable.

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