JPH0897882A - Cable connection controller - Google Patents

Abstract

PURPOSE: To automatically correct the connection relation between respective pair lines in response to overcurrent and step-out caused by the erroneous wiring of line cables. CONSTITUTION: When erroneous wiring is in the line cables 3a and 3b, a power supply circuit 112 detects overcurrent 100 and a step-out detection circuit 117 detects step-out 101. In response to this detection, a relay control circuit 114 controls a line connection relay 110 to successively vary the connection lines of the respective pair lines of the line cables 3a and 3b until overcurrent and step-out are no longer detected. When they are no longer detected, the wiring can be regarded as normal so that the connection relation at this time is kept hereafter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable connection control device, and more particularly to an IVD LAN in which voice and data are superimposed.
The present invention relates to a connection control device for a cable for (Integrated Voice & Data Local Area Network).

[0002]

2. Description of the Related Art For this type of IVD LAN, I
It is specified in EEE802.9, and such IVD
The configuration of an IVD LAN switching hub for concentrating LAN lines is shown in FIG. In FIG. 4, IVD
The LAN switching hub 1 includes a plurality of line control units 11,
It has 13 and IV corresponding to each line control unit.
Each D LAN adapter 2 is provided. These I
An IVD line (two lines for transmission and reception) consisting of a pair of lines between the VD LAN adapter 2 and the line control units 11 and 13
Connections are made via a and 3b respectively.

The IVD LAN adapter 2 has a terminal 4 under it, and this adapter 2 has an IVD line interface 20, transmission / reception transformers 21 and 22, and a power supply 23. These IVD cables 3a, 3b for transmission / reception from the IVD LAN adapter 2 (only a single adapter is shown in the figure for simplification)
Is concentrated at the IVD LAN switching hub 1,
The switching control unit 1 via the line control units 11 and 13
2 has been derived.

All of the line control units 11 and 13 have the same configuration, and therefore, in the figure, only the line control unit 11 has a specific configuration. This line control unit 11 is for each transmission / reception IV
Transmission / reception transformers 115 and 111 connected to the D cables 3a and 3b, and transmission / reception transformers 115 and 111,
An IVD line interface 33 connected to 111 to form an IVD line interface, and a transmission / reception transformer 11
And an overcurrent detection circuit 30 for detecting an overcurrent of the power supply to the IVD line cables 3a and 3b via 5,111. The detection output from each of the overcurrent detection circuits 30 is supplied to the overcurrent indicator 34 via the OR gate 31.

On the other hand, the IVD line interface 33 has a function of detecting out-of-synchronization depending on the state of the data received by the receiving transformer 111. These out-of-synchronization detection outputs are output from the out-of-synchronization indicator 3 via the OR gate 32.
5 is being supplied.

The switching control unit 12 filters and switches the data from each line control unit to select the line control unit to be sent and to send to the line control unit.

In such a configuration, when the IVD line cables 3a and 3b are connected, if an erroneous connection causes a loss of synchronization or an overcurrent due to a line short circuit, the display 34,
The display is made by 35. Then the operator IV
Assuming that the D-line cable is erroneously connected, the operator manually checks the erroneous wiring and corrects the cable connection.

[0008]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the LAN switching hub, when the synchronization is lost due to the incorrect wiring of the IVD line cable or the overcurrent due to the line short circuit occurs, the line cable is manually checked, so that there is a drawback that it takes a lot of time to repair the line cable.

An object of the present invention is to provide a cable connection control device capable of automatically checking a connection of a line cable and repairing a correct connection relationship without human intervention.

[0010]

A cable connection control device according to the present invention includes a transmission / reception transformer for transmitting / receiving data to / from a transmission / reception line composed of a paired cable, respectively.
Power supply means capable of supplying power to the transmission / reception line through the transmission / reception transformer to detect an overcurrent state of the supplied power supply current; out-of-synchronization detection means for detecting out-of-synchronization of received data by the reception transformer; When at least one of an overcurrent state by the power supply means and an out-of-synchronization state by the out-of-synchronization detection means is detected, connection switching control means for switching control of connection relationship between each pair of transmission / reception lines is included. There is.

[0011]

[Operation] When at least one of the overcurrent state of the power supply current and the out-of-synchronization state of the received data occurs, it is considered that there is a miswiring, and the connection relation of each pair of the transmission and reception cables is automatically set in advance. Switching control is sequentially performed in a predetermined order.
At this time, when neither the overcurrent state nor the out-of-synchronization state is detected, the connection relationship at that time is maintained thereafter, so that the correct cable connection state can be automatically obtained.

[0012]

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, and the same portions as those in FIG. 4 are designated by the same reference numerals. I
The VD LAN switching hub 1 has a plurality of line control units 1.
IVD L for each line control unit
The AN adapter 2 is provided, and these are connected by IVD line cables 3a and 3b composed of paired lines for transmission and reception, which is the same as the conventional example of FIG.

Since the line control units 11 and 13 have the same structure, only the line control unit 11 will be described. The receiving transformer 111 supplies power to the IVD line 3b and
The data is separated from the VD line 3b, and the transmission transformer 115 sets the data from the data transmission line 113 to I
The power is superimposed on and sent to the VD line 3a.

The power supply circuit 112 uses the IVD lines 3a, 3
It has a function of supplying power to b, monitoring overcurrent, and outputting an overcurrent detection signal 100 which is the monitoring result.

The data transmission circuit 113 receives data from the switching controller 12 and sends it to the transmission transformer 115. Further, the data receiving circuit 116 receives data from the receiving transformer 111 and sends it to the switching control unit 12.

The out-of-sync detection circuit 117 detects the out-of-sync detection signal 101 based on the data from the data receiving circuit 116.
Has the function of outputting.

The IVD line connection relay 110 controls the connection between the transmission / reception transformers 115 and 111 and the IVD line cables 3a and 3b in accordance with the control signals 212 to 223 from the relay control line 114, which is shown in FIG. A specific example is shown.

The relay control circuit 114 generates control signals 212 to 223 according to the overcurrent detection signal 100 and the out-of-synchronization detection signal 101.

The switching control unit 12 filters and switches the data from the data receiving circuit 116, selects a line control unit to be sent, and sends it to the data transmission circuit 113 in the line control unit.

The IVD LAN adapter 2 receives data from the switching hub 1, a receiving transformer 21 for receiving the power superimposed on the data from the IVD line cables 3a and 3b, and a packet from the receiving transformer 21. And an IVD line interface 20 for transmitting the packet from the terminal 4 to the transmission transformer 22, a transmission transformer 22 for transmitting the data from the interface 20 to the IVD line cable 3b, and a transmission / reception transformer. Power supply 2 that converts to the required voltage based on the power supply superimposed on the data from 22 and 21.
3 and 3.

FIG. 2 shows the IVD line connection relay 110 of FIG.
3 is a circuit diagram of a specific example of the IVD line cables 3a and 3b
The connection relationship between each of the pair wires A1, A2, B1 and B2 and the transmission / reception transformers 115 and 111 can be freely switched by each contact of the relays A to L. These relays A ~
ON / OFF of each contact of L is the relay control circuit 11
4 to control signals 212 to 223. According to these control signals, relays A to
The L coil is controlled.

FIG. 3 shows that the combination pattern (connection pattern) of the ON and OFF states of these relays A to L is No. Six patterns 1 to 6 are shown, and the line connection states corresponding to the respective patterns are shown correspondingly to the bottom.

If the IVD line cables 3a and 3b are properly connected, the combination pattern of ON / OFF of the relays A to L is No. 1 and each line A1, A2 of the cable 3a
Is connected to the transmission transformer, and each wire B1 of the cable 3b is
B2 is connected to the receiving transformer.

If there is incorrect wiring, the overcurrent detection signal 100,
Since at least one of the out-of-synchronization detection signals 101 is enabled, the relay control circuit 114 responds to this by changing and controlling the control signals 212 to 223,
Relay ON / OFF combination pattern No. 3 in FIG. Starting from the state of No. 2, No. 3, No. 4, No. 5, No. It operates so as to switch to 6 sequentially.

When neither the overcurrent state nor the out-of-synchronization state is detected, the relay control circuit 11
4 stops changing the control signals 212 to 223,
The ON / OFF combination pattern of the relays A to L at that time is held thereafter.

[0027]

As described above, according to the present invention, in response to overcurrent or loss of synchronization due to incorrect wiring of the line cable, the connection relation of each pair of line cables is automatically switched in sequence. Since this is done, there is an effect that erroneous wiring can be automatically eliminated and normal wiring can be restored.

[Brief description of drawings]

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

2 is an IVD line connection relay 110 of the block of FIG.
It is a circuit diagram which shows an example.

FIG. 3 is a diagram showing an example of an ON / OFF combination pattern of the relays of FIG. 2;

FIG. 4 is a block diagram of a conventional IVD LAN switching hub.

[Explanation of symbols]

 1 IVD LAN switching hub 2 IVD LAN adapter 3a, 3b IVD line cable 4 Terminal 11, 13 Line control unit 12 Switching control unit 110 IVD line connection relay 111 Reception transformer 112 Power supply circuit 113 Data transmission circuit 114 Relay control circuit 115 Transmission transformer 116 data receiving circuit 117 out-of-sync detection circuit

Claims (3)

[Claims] 1. A transmission / reception transformer for transmitting / receiving data to / from a transmission / reception line formed of a pair of wire cables, respectively.
Power supply means capable of supplying power to the transmission / reception line through the transmission / reception transformer to detect an overcurrent state of the supplied power supply current; out-of-synchronization detection means for detecting out-of-synchronization of received data by the reception transformer; A connection switching control means for switching the connection relationship of each pair of the transmission / reception lines when at least one of an overcurrent state by the power supply means and an out-of-synchronization state by the out-of-synchronization detection means is detected. Cable connection control device. 2. The connection switching control means, in response to detection of at least one of the overcurrent state and the out-of-synchronization state, sequentially controls switching of the connection relation of each pair line in a predetermined order, and 2. The cable connection control device according to claim 1, wherein when the overcurrent state and the out-of-synchronization state are no longer detected, the connection relationship of the pair lines at that time is maintained thereafter. 3. The IVD according to the IEEE802.9 standard in which voice and data are superimposed on each other, in the paired cable.
LAN (Integrated Voice & Data Local Area Networ
The cable connection control device according to claim 1 or 2, which is a cable for k).