JP2601188B2 - Communication device of flag synchronous line - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication device of a flag synchronous line, and more particularly to a communication device of a flag synchronous line which requires connection of a protocol analyzer.

[0002]

2. Description of the Related Art FIGS. 6 and 7 show a conventional configuration for performing monitor / opposite communication.

The operation of the configuration shown in FIG. 6 will be described. A monitor / opposite communication device 43 is provided between the communication device 41 and the terminal / other communication device 46, and when opposing communication is required, the connection is switched to connect the monitor / opposite communication device 43 and the protocol analyzer 42, and the monitor Is required, the monitor / opposite communication device 43 is similarly connected to the communication device 4.
1 and the protocol analyzer 42, and when the monitor / opposite communication is not required, the monitor / opposite communication device 43 is connected only to the communication device 41. Switching of the connection is performed by manual operation or control from the control device 45.

The operation of the configuration shown in FIG. 7 will be described. A switch 44 between the communication device 41 and the terminal / other communication device 46 controls connection / disconnection to the protocol analyzer 42. Switching of the connection is performed under the control of the control device 45. When the opposite communication is performed, the connection of the switch 44 is switched to the protocol analyzer 42 side. When the monitoring is performed, the connection to the communication device 41 is left as it is, and the transmission / reception signal of the communication device 41 is branched to the protocol analyzer 42.

[0005]

In the configuration shown in the prior art, a device for monitor / facing communication must be prepared separately from the communication device. There is a disadvantage that a plurality of monitors / opposed communication devices must be prepared.

Further, since the line is physically switched, a communication device for frame multiplexing communicates with a terminal or another communication device through a certain data link,
There is also a drawback in that it is not possible to perform on-coming communication between the monitor / opposite communication device and the terminal or another communication device using another data link accommodated in the same communication device.

[0007] An object of the present invention is to connect a protocol analyzer to a communication device that communicates over a flag synchronous line for the purpose of isolating a failure or the like.
An object of the present invention is to provide a communication device of a flag synchronous line which does not require a device for the opposite communication and can perform the opposite communication simultaneously with the normal communication.

[0008]

According to the present invention, there is provided a communication device for a flag synchronous line, which communicates with a terminal or another communication device via a flag synchronous line, and at least an interface unit for interfacing with a terminal / other communication device; Terminations,
Protocol analyzer for protocol analyzer connection
An interface unit and a communication device of a flag synchronous line having a control unit, between the line termination unit and the interface unit in the communication device, a monitor for monitoring a communication status of a protocol analyzer with a terminal or another communication device or It has a monitor / opposite communication control unit that controls opposing communication that transmits and receives test patterns and the like by interrupting communication with a terminal or another communication device.

The monitor / opposite communication control unit includes a first selector for selecting reception data to be input to the line termination unit, and a transmission data from the line termination unit according to a control signal from a control unit in the communication device. A control interface for controlling a transmission clock, a frame control unit for controlling received data from the protocol analyzer in response to monitoring or opposing communication, and transmission data from the line termination unit, and a transmission clock, The data received from the protocol analyzer is transmitted to the second selector according to the control signal from the control unit interface in response to the monitor or the opposite communication, and the control signal is also transmitted to the clock selector. A frame control unit for transmitting the selection signal to the second selector, and a terminal or The data received from the communication device and the data received from the protocol analyzer are selected by the control signal from the control unit interface and output to the line termination unit as received data. A first selector that outputs as transmission data, transmission data from a line termination unit, and reception data from a protocol analyzer controlled by a frame control unit are selected by a selection signal of the frame control unit, and are selected by an interface unit. A second selector that outputs as transmission data, and a transmission clock from a terminal or another communication device, according to a control signal of a frame control unit, corresponding to monitor or opposite communication,
It has a clock transmission control unit that transmits or stops transmission to the line termination unit.

Further, when the monitor / opposite communication control section of the present invention inputs the received data from the interface section to the frame control section and the frame control section recognizes the received data as a data frame for the opposing communication, If a flag pattern is sent to one selector, and a data frame for opposite communication is sent to the protocol analyzer interface unit, and the frame control unit does not recognize the received data as a data frame for opposite communication, the first selector A communication device of a flag synchronous line for transmitting a received data frame and transmitting a flag pattern to a protocol analyzer interface unit.

[0011]

According to the communication apparatus of the present invention, a monitor / opposite communication control section is provided between a line termination section and an interface section in the communication apparatus, and a frame control section and a second communication section are provided in the monitor / opposite communication control section. A first and a second selector, a clock transmission control unit, and a control unit interface are provided, and each selector and the clock transmission control unit are controlled by the control unit via the frame control unit and the control unit interface. The communication device, the protocol analyzer, and the connection between the line terminating units in the communication device are switched, and the communication between the terminal or another communication device and the communication device of the present invention is monitored or interrupted by the protocol analyzer to execute the opposing communication. Further, it is possible to perform the opposite communication simultaneously with the normal communication.

[0012]

Next, the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing the relation of a communication device of a flag synchronous line of the present invention, FIG. 2 is a block diagram of a first embodiment of the present invention, and FIG. 3 is a block diagram of a second embodiment of the present invention. 4 and 5
9 is a flowchart showing switching of each signal in the first and second embodiments. As shown in FIGS. 1 to 3, the communication device 1
Is a monitor / opposite communication control unit 10, a line termination unit 11,
It comprises a control unit 12, an interface unit 13, and a protocol analyzer interface unit 14.

Next, a first embodiment will be described with reference to FIG. The communication device 1 transmits a transmission clock ST2 from a terminal or another communication device through the interface unit 13.
, A reception clock RT, and reception data RD, and a transmission clock ST1 to a terminal or another communication device.
And the transmission data SD are output. Further, the transmission clock 1, the transmission clock 2, the transmission data 1, the transmission data 2, and the reception clock are transmitted to the protocol analyzer through the protocol analyzer interface unit, and the reception data from the protocol analyzer is input. The control unit 12 is connected to the line termination unit 11 and the monitor / opposite communication control unit 10, and the line termination unit 11 is connected to the monitor / opposite communication control unit 10 and the monitor / opposite communication control unit 1
0 is connected to the interface unit 13 and the protocol analyzer interface unit 14.

The monitor / opposite communication control unit 10 includes a control unit interface 20, a frame control unit 21 for performing flag synchronization detection / data accumulation / selection / clock transmission control, a first selector 22, a second selector 23, And a clock transmission control unit 24. The control unit interface 20 in the communication device 1 is connected to the frame control unit 21 and the first selector 22 under the control of the control unit 12. The transmission clock ST2 from the interface unit 13 is input to the clock transmission control unit 24, and the output of the clock transmission control unit 24 is input to the line termination unit 11. Receive clock RT
Is connected to the line termination unit 11 and the protocol analyzer interface unit 14, and the received data RD is connected to one input of the first selector 22, and the other input of the first selector is Is received. This received data is also input to the frame control unit 21. The output of the first selector is connected to the line termination unit 11 and the protocol analyzer interface unit 14. The output of the transmission clock ST1 from the line termination unit 11 is connected to the interface unit 13, the protocol analyzer interface unit 14, and the frame control unit 21. Transmission data SD from line termination
The output is one input of the second selector 23, the protocol analyzer interface unit 14 and the frame control unit 21.
Is input to The other input of the second selector is
The output of the frame control unit 21 is connected, and the output of the second selector is input to the interface unit 13.

Next, the operation will be described. In the case of only the monitor without the opposing communication, the transmission clock ST2 from the interface unit 13 passes through the clock transmission control unit 24 and is input to the line termination unit 11, and the reception data RD passes through the first selector 22 and enters the line termination unit. 11 is input. The transmission data SD from the line terminating unit 11 passes through the second selector 23 and is output to the interface unit 13, and the reception clock R
T is input to the line termination unit 11, and the transmission clock ST 1 is output to the interface unit 13. The reception data RD from the terminal or another communication device is input to the line termination unit 11 in synchronization with the reception clock RT received at the same time.
The line termination unit 11 receives the reception data RD with the reception clock RT.
And terminate the line. The transmission data SD from the line termination unit 11 generates a transmission clock ST1 from the transmission clock ST2 from the interface unit 13, and outputs the transmission data SD in synchronization with the transmission clock ST1. Transmission clock ST
1 and the transmission data SD are directly sent to the interface unit 13
Is output to a terminal or another communication device via the terminal. At this time, the reception data RD and the reception clock RT to the line termination unit 11, the transmission data SD and the transmission clock ST1 from the line termination unit 11 are output to the protocol analyzer via the protocol analyzer interface unit 14.

When the remote communication is performed with the terminal or another communication device, the reception data R from the terminal or another communication device is used.
D and the received clock RT are input to the line termination unit 11 and the protocol analyzer interface unit 14, respectively, and only valid reception data RD having data between the flags is processed by the line termination unit 11 and the protocol analyzer and captured. It is. The transmission data SD to the terminal or another communication device is the transmission data S from the line termination unit 11.
In the case of D, the line terminator side of the second selector 23 is selected, and in the case of data received from the protocol analyzer, the frame controller side of the second selector 23 is selected.
When the frame control unit 21 receives only the flag, that is, when there is no data received from the protocol analyzer, the second selector 23 controls to select the line termination unit 11 side, and when the data received from the protocol analyzer is received. Stops the transmission clock ST2 to the line termination unit 11 at the break of the transmission data from the line termination unit 11 (when the flag is transmitted), switches the second selector 23 to the frame control unit side, and The received data from the protocol analyzer stored in the frame control unit 21 is transmitted. After the transmission of the reception data is completed, the line termination unit 11
The transmission of the transmission clock ST1 is started, the second selector 23 is switched to the line termination side, and the transmission data SD from the line termination unit 11 and the reception data from the protocol analyzer are selected.

When the communication between the communication apparatus of the own station and the protocol analyzer is to be performed, the first selector 22 is switched to select the protocol analyzer interface section under the control of the control section interface 20 to be realized. Can be.

FIG. 3 shows a second embodiment of the present invention. The difference from the first embodiment is that the received data RD from the interface unit 13 is not directly input to the first selector 22, but is input to the frame control unit 21, and the received data RD, that is, the data frame is transmitted by the frame control unit 21. When recognizing that the communication is for the opposite communication, a flag pattern is sent to the first selector 22 and the protocol analyzer interface 1
4 sends the data frame for the opposite communication to the first selector 2 if the data frame is not the data frame for the opposite communication.
2 is to transmit the received data frame, and to transmit a flag pattern to the protocol analyzer interface unit 14. The operation at the time of monitoring is the same as in the first embodiment. FIG. 4 is a flowchart showing the switching of each signal in the first embodiment, and FIG. 5 is a flowchart showing the switching of each signal in the second embodiment.

[0020]

As described above, the communication device of the flag synchronous line according to the present invention has a monitor / opposite communication control unit in the communication device, and does not require any additional device outside the terminal and other communication devices. And monitor or opposite communication can be performed. Further, the communication device according to the present invention has an effect that the communication device can continue the communication even when the opposite communication is performed, and the communication device does not need to be prepared for the opposite communication.

[Brief description of the drawings]

FIG. 1 is a diagram showing the relation of a communication device of a flag synchronous line according to the present invention.

FIG. 2 is a configuration diagram of one embodiment of the present invention.

FIG. 3 is a configuration diagram of another embodiment of the present invention.

FIG. 4 is a flowchart showing switching of each signal in the embodiment shown in FIG. 2;

FIG. 5 is a flowchart showing switching of each signal according to another embodiment shown in FIG. 3;

FIG. 6 is a configuration diagram in the case of performing conventional monitor / opposite communication.

FIG. 7 is another block diagram in the case of performing the conventional monitor / opposite communication.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 communication device 10 monitor / opposite communication control unit 11 line termination unit 12 control unit 13 interface unit 14 protocol analyzer interface unit 20 control unit interface unit 21 frame control unit 22, 23 selector 24 clock transmission control unit 41 communication device 42 protocol analyzer 43 Monitor / opposite communication device 44 switch 45 control device 46 terminal / other communication device

Claims (3)

(57) [Claims] 1. An interface unit for communicating with a terminal or another communication device over a flag synchronous line and interfacing with at least a terminal / other communication device;
Protocol analyzer for protocol analyzer connection
An interface unit and a communication device of a flag synchronous line having a control unit, between the line termination unit and the interface unit in the communication device, a monitor for monitoring a communication status of a protocol analyzer with a terminal or another communication device or A flag synchronous line communication device, comprising: a monitor / facing communication control unit for controlling a facing communication for transmitting / receiving a test pattern or the like by interrupting communication with a terminal or another communication device. 2. The communication system according to claim 1, wherein the monitor / opposite communication control unit includes a first selector for selecting reception data to be input to a line termination unit, based on a control signal from a control unit in the communication device; A control unit interface for controlling a transmission clock, a frame control unit for controlling received data from the protocol analyzer in response to monitoring or opposing communication, and transmission data from the line termination unit, and a transmission clock, The data received from the protocol analyzer is transmitted to the second selector according to the control signal from the control unit interface in response to the monitor or the opposite communication, and the control signal is also transmitted to the clock selector. And a frame control unit for transmitting a selection signal to the second selector, and a terminal or another terminal. The data received from the communication device and the data received from the protocol analyzer are selected by the control signal from the control unit interface, output to the line termination unit as received data, and transmitted to the protocol analyzer interface unit in response to monitoring or opposing communication. A first selector for outputting as data, transmission data from a line termination unit, and reception data from a protocol analyzer controlled by a frame control unit, selected by a selection signal of the frame control unit, and transmitted to an interface unit. Clock transmission control for sending or stopping the second selector that outputs as data and the transmission clock from the terminal or other communication device to the line termination unit in response to the monitor or the opposite communication by the control signal of the frame control unit 2. The flag synchronous line according to claim 1, further comprising: Communication device. 3. The monitor / opposite communication control section inputs data received from the interface section to a frame control section, and when the frame control section recognizes the received data as a data frame for opposing communication, the first A flag pattern is sent to the selector, and a data frame for the opposite communication is sent to the protocol analyzer interface unit. If the frame control unit does not recognize the received data as a data frame for the opposite communication, the data is received by the first selector. 3. The communication device for a flag synchronous line according to claim 2, wherein the communication device transmits the data frame obtained and transmits a flag pattern to a protocol analyzer interface unit.