JPH06282508A - Connection form recognition system of multiport repeater - Google Patents

Abstract

PURPOSE:To enable the recognition of a connection form utilizing an AUI port, a connection form utilizing a switch for cascade connection and a connection form utilizing a cross connection cable, etc., of the connection forms of plural multiport repeaters. CONSTITUTION:In a multiport repeater having a switch 43 for cascade connection and an AUI part on the network of 'Ethernet' in conformity to an IEEE 802. 3 standard which is capable of recognizing that plural multiport repeaters are mutually connected, a first detection part 41 detecting the ON/OFF of the switch 43 for cascade connection and a second detection part 42 detecting the presence or absence of the connection of a MAU 6 to the AIU port are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection form recognition method for multiport repeaters connected to each other on an Ethernet network conforming to the IEEE802.3 standard.

[0002]

2. Description of the Related Art Conventionally, when a plurality of multi-port repeaters are connected on a computer network, a method of inputting one port of one multi-port repeater to an AUI port of the other multi-port repeater or a cascade connection switch is provided. One multi-port repeater's 1 port swaps the transmission line and the reception line to input to the other multi-port repeater's 1 port, or a cable that connects two multi-port repeaters without a cascade connection switch A method is known in which a cross connection cable in which a transmission line and a reception line are exchanged by processing is used. With these interconnections,
The current remote network management methods such as SNMP can only recognize that one of the output ports of a specific multi-port repeater is connected to another multi-port repeater. There is a problem that is not recognized as a different connection method.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a connection mode among a plurality of multiport repeaters.
It is to provide a connection form recognition method of a multi-port repeater capable of recognizing a connection form using an AUI port, a connection form using a cascade connection switch, a connection form using a cross connection cable, and the like.

[0004]

In order to solve the above-mentioned problems, in the multi-port repeater connection form recognition method of the present invention, a plurality of multi-port repeaters are connected to each other as shown in FIG. IE that can be recognized that
In the multi-port repeater 4 having the cascade connection switch 43 and the AUI port on the Ethernet network conforming to the EE802.3 standard, the first detection unit 41 for detecting ON / OFF of the cascade connection switch 43 and the AUI port. And a second detector 42 for detecting whether or not the MAU 6 is connected to the MAU 6. Further, as shown in FIG. 4, means for applying a differential voltage to the pair of output signal line pairs 61 and 62 for transmitting the presence / absence of collision to the AUI port of the multi-port repeater 4 and the pair of output signal line pairs. Means for detecting the potential difference of the MAU6 and connected to the AUI port.
It is preferable to provide a means 60 for short-circuiting the pair of output signal lines on the side of.

[0005]

According to the present invention, the first detector 41 monitors ON and OFF of the cascade connection switch 43 of the multiport repeater 4 conforming to the IEEE802.3 standard, and the AUI (Attachment Unit Int) is monitored.
interface part, MAU (Med
The presence / absence of ium Attachment Unit) is monitored by the second detection unit 42 to determine the connection form from the states of the cascade connection switch 43 and the MAU 6 when two multiport repeaters are connected. When the cascade connection switch 43 is ON, MA
When U6 is not connected, one port of one multi-port repeater and the cascade connection switch 43 are turned on.
It is determined that the cascade connection port of the multi-port repeater is connected with the straight connection cable, and the cascade connection switch 43 is OFF.
When the AU6 is connected, it is determined that one port of one multi-port repeater and the MAU6 connected to the AUI port are connected by a cable, and the cascade connection switch 43 is OFF and the MAU6 is not connected. It is determined that one port of each of the two multi-port repeaters is connected by the cross connection cable. When the cascade connection switch 43 is ON and the MAU 6 is connected, the connection form cannot be limited. The connection form of the multi-port repeater can be remotely recognized by discriminating these by the first and second detection units 41 and 42 and transmitting the result to the outside using a network management protocol such as SNMP.

Further, as shown in FIG. 4, in the AUI port portion of the multiport repeater conforming to the IEEE802.3 standard, as shown in FIG. 4, MAU 6 to DTE (Data Te
MAU to the AUI port of the multi-port repeater 4 using the free CO-A and CO-B signals that transmit the presence / absence of a collision to the terminal equipment.
It is possible to determine the presence or absence of connection of No. A driver 47 that short-circuits the CO-A signal 61 and the CO-B signal 62 on the MAU 6 side and a potential difference between the CO-A signal and the CO-B signal on the multiport repeater side, and its CO-A
When the differential comparator 46 capable of detecting the potential difference between the signal 61 and the CO-B signal 62 is connected in parallel and the MAU 6 in which the CO-A signal 61 and the CO-B signal 62 are short-circuited is connected to the multi-port repeater 4. Means that no potential difference is generated between the CO-A signal 61 and the CO-B signal 62,
The presence or absence of is detected. By notifying the network management means of this detection result by the morphology information transmission means 40, the connection of the MAU 6 can be recognized remotely, and when the two multi-port repeaters are connected, the connection mode can be specified.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows an embodiment of a multiport repeater 4 according to the present invention. In this multi-port repeater 4, the cascade connection switch 43 is turned on and turned off.
It has a first detector 41 for detecting F and a second detector 42 for detecting the presence or absence of MAU 6. A repeat unit 44 repeats the signal of each port to another port. ON and OF of the cascade connection switch 43
The state monitoring unit 45 monitors the outputs of the first detection unit 41 that detects F and the second detection unit 42 that detects the presence / absence of the MAU 6, and the connection form can be determined by the combination thereof. By transmitting the determination result to the morphological information transmitting means 40, the SN
It is possible to remotely manage the connection form of the multi-port repeater 4 by using a network management means such as an MP.

FIG. 2 shows an MUI from an output port having a multi-port repeater 2 to an AUI port of the multi-port repeater 4.
It is a connection example of a multi-port repeater connected by a cable 7 via an AU6. Cables 3 and 5 are connected to the output ports of the multi-port repeaters 2 and 4. Figure 3
Shows a connection example of a multi-port repeater in which the output ports of the multi-port repeater 2 and the multi-port repeater 4 are connected in a cascade manner. When the switch for cascade connection of one multi-port repeater is turned on and the cable is connected, There are two configuration examples when a cable for cross connection is used in FIG. 7, each of which is different from the form shown in FIG.

FIG. 4 shows an example of the configuration of a portion for detecting the presence / absence of connection of the MAU 6, and on the MAU 6 side, a CO-A signal 61 and a CO-B signal 62 for transmitting the presence / absence of a collision are short-circuited 60. Then, on the multiport repeater 4 side, the differential driver 47 causes a potential difference between the signal pair of the CO-A signal 61 and the CO-B signal 62. A comparator 46 that detects the potential difference between the CO-A signal 61 and the CO-B signal 62 is connected to this signal pair. When the MAU 6 is connected to the multi-port repeater 4, due to a short circuit due to the short circuit wire 60, the comparator 46 displays CO-A.
The potential difference between the signal 61 and the CO-B signal 62 becomes 0, and MA
When U6 is not connected, the potential difference of the differential driver 47 is directly detected by the comparator 46, and the presence or absence of MAU6 can be confirmed. In the configuration example shown in FIG. 4, the connection form can be identified as the configuration shown in FIG. By transmitting the detection signal of the comparator 46 to the form information transmitting means 40, the connection form of the multi-port repeater 4 can be managed remotely. 48 is an input buffer, 63 is a DI signal, 64
Is a DO signal. For more information on these, for example:
It is specified in 1990 JIS X5252.

[0010]

According to the invention of claim 1, in the multi-port repeater, the O of the cascade connection switch is
By providing a first detection unit for detecting N / OFF and a second detection unit for detecting the presence / absence of MAU connection to the AUI port, it is possible to identify the difference in the connection form of the multiport repeater in a network such as SNMP. It is possible to recognize remotely by using the management means, which has an effect of facilitating network management.

According to the second aspect of the invention, in the AUI port of the multi-port repeater, while applying a differential voltage to the pair of output signal line pairs for transmitting the presence / absence of collision, the potential difference between the pair of output signal line pairs. By providing means for short-circuiting the output signal line pair on the side of the MAU connected to the AUI port, it is possible to easily detect whether or not the MAU is connected to the AUI port.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a first connection example of a multiport repeater according to the present invention.

FIG. 3 is an explanatory diagram showing a second connection example of the multi-port repeater according to the present invention.

FIG. 4 is a block diagram of a circuit for detecting whether or not a MAU is connected in the present invention.

[Explanation of symbols]

 1 AUI cable 2 multi-port repeater 3 cable 4 multi-port repeater 5 cable 6 MAU 7 cable 40 form information transmission means 41 first detection unit 42 second detection unit 43 cascade connection switch 44 repeat unit 45 state monitoring unit

Claims (2)

[Claims] 1. A multiport repeater having a switch and an AUI port for cascade connection on an Ethernet network conforming to the IEEE802.3 standard, which can recognize that a plurality of multiport repeaters are connected to each other, is used for cascade connection. Switch ON /
First detection unit for detecting OFF and M for AUI port
A multiport repeater connection form recognition method, comprising: a second detection unit that detects whether or not an AU is connected. 2. A multi-port repeater having an AUI port capable of recognizing that a plurality of multi-port repeaters are connected to each other on an Ethernet network conforming to the IEEE802.3 standard, for transmitting the presence / absence of collision. Means for applying a differential voltage to the pair of output signal line pairs and means for detecting the potential difference between the pair of output signal line pairs are provided, and M connected to the AUI port is provided.
A connection form recognition system for a multi-port repeater, comprising means for short-circuiting the pair of output signal lines on the AU side.