JP2000134280A - Communication controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To speedily observe a line sate in a communication controller. SOLUTION: A communication controller is provided with a communication control part 20 controlling various communications and transmitting a communication interface signal 21, a line connector 30 terminating a signal line from the part 20, two line state observation ports 400 and 500 functioning as connectors for connection to one end of each monitoring device for observing the state of the communication interface signal and a channel switch 200 and a selector 300, which correspond to the two line state observation ports 400 and 500 for switching the communication interface signal 21 to the side of the line connector 30 or the side of a line state observation ports 400 and 500 by a selection signal emitted from a switch circuit 600.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a communication control device, and more particularly, to a communication control device capable of monitoring a line state.

[0002]

2. Description of the Related Art ITU-T. In a communication control device having a communication interface such as V24, X21, V35,
Various line monitoring devices are used as effective means for isolating communication failures caused by line quality, DCE failure, partner terminal failure, and the like. Conventionally, as disclosed in Japanese Patent Application Laid-Open No. 1-155755, connection between a communication control device and various line monitoring devices is performed by removing a communication cable connecting the communication control device and the DCE. And a communication cable, or various line monitoring devices are inserted between the communication cable and the DCE to monitor the state of the line.

[0003]

However, the above-mentioned conventional apparatus has the following problems. A first problem is that communication is cut off for a long time due to connection of various line monitoring devices. The reason is that the cable is disconnected from the communication control device or the DCE, and the line is disconnected while the cable is connected to the various line monitoring devices. The second problem is that various line monitor devices cannot be connected in some cases. The reason is that the communication cable is generally buried under the floor, the communication cable in the communication control device is fixed to a cable rack, and the DCE device etc. is often fixed to a dedicated rack. This is because it becomes very difficult to connect the line monitor device. A main object of the present invention is to provide a communication control device having a line state observation port that solves the above problems.

[0004]

Means for Solving the Problems In order to solve the above problems, the communication control device of the present invention takes the following means. That is, in the communication control device according to claim 1, a communication control unit that performs various communication controls and transmits a communication interface signal, a line connector that terminates a signal line from the communication control unit, and the communication interface signal The two line state observing ports functioning as connectors for connecting to one end of each of the various monitor devices so as to observe the state of each of the various monitor devices, and the selections issued from the switching circuit corresponding to each of the two line state observing ports. Two communication path switches for switching the communication interface signal to be transmitted to either the line connector side or the line state observation port side by a signal.

According to a second aspect of the present invention, there is provided a communication control unit which performs various kinds of communication control to enable transmission of two communication interface signals, and terminates two signal lines from the communication control unit. Two line connectors to be connected, two line state observation ports functioning as connectors for connecting to one ends of various monitor devices so as to observe the states of the two communication interface signals, respectively, and the two line state observations The two communication interface signals are transmitted to either the two line connector sides or the two line state observation port sides corresponding to the two communication interface signals in response to a selection signal generated from the switching circuit corresponding to each of the communication ports. In order to switch between the two communication lines, a total of four And a signal obtained from the two signal lines via the communication path switch in response to a signal from the switching circuit and transmitted to the two line state observation ports to monitor the signal. And two selectors for selecting whether to do so.

According to a third aspect of the present invention, there is provided a communication control unit for performing various kinds of communication control and enabling transmission of n communication interface signals, and n communication from the communication control unit.
N line connectors for terminating each of the signal lines, and two line state observing units functioning as connectors for connecting to one ends of various monitor devices so as to observe the states of the n communication interface signals, respectively. Ports and the two line state observing ports respectively corresponding to the n line connector side or the two line state observing ports respectively corresponding to the n communication interface signals by a selection signal issued from a switching circuit. In order to switch to transmission to any of the port sides, a total of 2n are provided for each of the n communication lines.
And transmitting any one of signals obtained from the n signal lines via the communication path switch to the n line state observation ports by a signal from the switching circuit and a signal from the switching circuit. And two selectors for selecting whether to monitor the signal. As described above,
A feature of the communication control apparatus according to the present invention is that the communication control apparatus has a line state observation port.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, the selection signal 6
01, the line state observing ports 400 and 500 are instructed to output the communication interface signal 21. When the communication interface signal 21 is output, the switch 200, which is a communication path switch, and the selector 300
Are switched from the A side to the B side. If various line monitor devices are connected to the line status observation ports 400 and 500 in advance, the line status can be observed by the various line monitor devices when the switch is switched. In addition, since the switching time can be short-circuited, the influence on communication in advance can be reduced.

Referring to FIG. 1, the switch 200 sends a communication interface signal 21 from the communication control unit 20 to the A side 201 or the B side 501 according to the content of the selection signal 601.
Switch to The selector 300 converts the signal 301 to the line connector 30 according to the content of the selection signal 601 into the A side 201.
Or, switch to the B side 401. The line state observation ports 400 and 500 are connected to the switch 200 and the selector 30.
A connector for connecting B side signals 401 and 501 of 0 to various monitor devices. The line connector 30 is a connector for connecting a communication cable for connecting a DCE or the like. A /
The B switching circuit 600 includes the switch 200 and the selector 30
0 is switched to A / B, or a selection signal 601 for instructing the selection is selected.
Output to The communication control unit 20 has a function of performing various types of communication control and transmitting and receiving the communication interface signal 21, but a detailed description thereof will be omitted.

Next, the operation of the circuit device shown in FIG. 1 will be described. Normally, the communication control device 10 and a line are connected via a line connector 30. At this time, the A / B switching circuit 600 is set to select the A side. The switch 200 connects the communication interface signal 21 to the A side 201 and the selector 300 connects the A side signal 201 to the line connector 30 because the selection signal 601 indicates the A side. The communication interface signal 21 is electrically connected to the line connector 30.

Here, in order to insert various line monitoring devices between the communication control device 10 and the line, one of the Y-type cables of the various line monitoring devices (or the DCE side connection cable) is connected to the line state observing port 400. And the other of the Y-type cables (or DTE-side connection cables) of the various line monitor devices is connected to the line state observation port 500. At this time, when the A / B switching circuit 600 is set to the B side, the switch 200 and the selector 300 are respectively switched to the B side, so that the communication interface signal 21 becomes the line state observation port 500, various line monitors, and the line state observation port. 400, connected to the line via the line connector 30.

As described above, the switching circuit 600 uses the switch 20.
By simply switching 0 and the selector 300, various line monitors can be inserted without changing the connection with the communication cable or DCE.

Next, a second embodiment of the present invention will be described with reference to the drawings. Referring to FIG. 2, for example, in the case of a communication control device capable of connecting two lines, selectors 700 and 710 are added to the configuration described in the previous embodiment. Further, the A / B switching circuit 600 also serves as a line number selection circuit. Normally, when various line monitors are not connected, the A / B switching circuit 600 switches the switches 200 and 210.
And setting the selectors 300 and 310 to select the A side. Therefore, as described in the previous embodiment, the communication interface signals 21 and 22 are electrically connected to the line connectors 30 and 40, respectively.

Here, for example, when various line monitoring devices are inserted into the line connector # 1 side, as described in the previous embodiment, one of the Y-type cables of the various line monitoring devices is connected to the line state observing port 400. (Or a DCE-side connection cable), and the other of the Y-type cables (or DTE-side connection cables) of the various line monitor devices is connected to the line state observing port 500. At this time, A /
When only the switch 200 and the selector 300 on the # 1 side are set to the B side in the B switching circuit 600 and the setting is changed to the setting for instructing the selectors 700 and 710 on the # 1 side, #
While the communication interface signal 22 on the second side is still electrically connected to the line connector 40, the communication interface signal 21 on the # 1 side is
00, various line monitors, line state observation port 400,
It is connected to a line via a line connector 30.

Conversely, when various line monitor devices are inserted into the line connector # 2 side, the A / B switching circuit 600
Only the switch 210 and the selector 310 on the side are set to the B side, and the setting is changed to instruct the selectors 700 and 710 to the # 2 side. As described above, the switches 200 and 210 and the selectors 300, 310,
By simply switching between 700 and 710, communication cables and D
Various line monitoring devices can be inserted without changing the connection with the CE.

According to the above two embodiments, it is also known to those skilled in the art that when the communication control device can connect to n lines, one line can be selected and various line monitors can be connected. It would be obvious.

[0016]

As described above, according to the communication control device of the present invention, the following effects are exhibited. The first effect is that there is no need to disconnect communication for a long time to connect various line monitors between the communication control device and the DCE. The reason is that, by providing dedicated ports for connecting various line monitors, the monitor is inserted only by the delay time of the switching circuit.

The second effect is to facilitate connection of various line monitors between the communication control device and the DCE or the like. The reason is that by providing dedicated ports for connecting various line monitors, the monitor can be inserted simply by connecting the monitor connection cable to the dedicated port. This is because there is no need to remove the fixed communication cable. Further, even when the communication control device can be connected to n lines, it is possible to select one line and connect various line monitors.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a communication control device shown as a first embodiment of the present invention.

FIG. 2 is a circuit diagram of a communication control device shown as a second embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 20 communication control unit 21 communication interface signal 30 line connector 200 switch 300, 700, 710 selector 400 line state observing port 500 line state observing port 600 A / B switching circuit

Claims (3)

[Claims] 1. A communication control unit for performing various communication controls and transmitting a communication interface signal, a line connector for terminating a signal line from the communication control unit, and various monitor devices for observing a state of the communication interface signal. Two line state observation ports each functioning as a connector for connecting to one end;
Two corresponding to each of the two line state observing ports for switching the communication interface signal to be transmitted to either the line connector side or the line state observing port side by a selection signal issued from a switching circuit. A communication control device comprising a communication path switch. 2. A communication control unit for performing various communication controls and capable of transmitting two communication interface signals; two line connectors for terminating two signal lines from the communication control unit; and the two communication units. Two line state observing ports functioning as connectors for connecting to one end of each of various monitor devices so as to observe the state of the interface signal, respectively, corresponding to each of the two line state observing ports, In order to switch the two communication interface signals to be transmitted to either the two line connector sides or the two line state observation port sides corresponding to the two communication interface signals in response to the selection signal issued,
A total of four communication path switches provided two each for two communication lines, and any one of signals obtained from the two signal lines via the communication path switch by a signal from the switching circuit. A communication control apparatus comprising: two selectors for selecting whether to monitor a signal by transmitting a signal to the two line state observation ports. 3. A communication control unit for performing various communication controls and capable of transmitting n communication interface signals; n line connectors for terminating n signal lines from the communication control unit; 2 that functions as a connector for connecting to one end of each of various monitor devices so as to observe the state of the communication interface signal of
Two line state observing ports, and corresponding to each of the two line state observing ports, the n communication interface signals corresponding to the n communication interface signals respectively by a selection signal issued from a switching circuit, or the n line connector side or the 2 In order to switch to transmission to any one of the two line state observation ports, a total of 2n communication path switches are provided for each of the n communication lines, and a total of 2n communication path switches are provided by a signal from the switching circuit. And two selectors for selecting which of the signals obtained from the signal lines via the communication path switch to monitor the signals by transmitting to the n line state observation ports. Communication control device provided.