JPH0237867A - Loop back test control system - Google Patents

Abstract

PURPOSE:To facilitate the loop back test by providing a loop back selector part controlled by a control part and a PB signal receiving identifying part to receive and identify a PB signal at a data transmitter and forming a return circuit with the control from a maintenance console and a center. CONSTITUTION:A data transmitter 1 provides a loop back selector 2 to form a loop back circuit with a control part 4 composed of a microprocessor, etc., and a PB signal receiving identifying part 3 to receive and identify a loop back circuit forming request signal by the PB signal sent at the time of the loop back test from a maintenance console 7 or a center 8. The desired loop back circuit is formed from the maintenance console 7 or the center 8. Thus, the loop back test can be facilitated from the maintenance console 7 or the center 8 of the position away from the data transmitter 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a return test control method for performing a return test of a data transmission device from a maintenance console or center.

Repeat tests are conducted to confirm the normality of the data transmission equipment and to isolate faults. There is a demand for controlling the loopback circuit used in this loopback test from a maintenance console or center.

[Conventional technology]

For example, as shown in FIG. 5, a conventional data transmission device includes a data terminal device 31, an interface unit 32,
Comprising a modem section 33 and a network control section 34, the modem section 33
control switch SW for forming the return circuit 36 of the network controller 34 or the return circuit 37 of the network control unit 34; A switch section 35 having SW2 is provided at the front of the device.

When performing a return test from the maintenance console or center (not shown), the control switches SWI and SW of the switch section 35
2, the modem section 33 or the network control section 34
The folding circuits 36 and 37 were formed in this case.

[Problem to be solved by the invention]

It is common for data transmission equipment to be placed at a location far from the maintenance console or center, and in order to perform a return test as described above, a maintenance person must go to the location where the data transmission equipment is installed and install the switch. Since the return test must be performed by operating the wire 35 and communicating with the maintenance console or the center by telephone, the return test operation is complicated and takes a long time.

An object of the present invention is to form a return circuit under control from a maintenance console or center to facilitate return tests.

[Means to solve the problem]

The loopback test control method of the present invention controls the formation of a loopback circuit from a maintenance console or center using a PB double signal, and will be explained with reference to FIG.

The data transmission device is provided with a return selector unit 2 controlled by a control unit 4 and a PB signal reception identification unit 3 that identifies reception of the PB double signal, thereby forming a return circuit using the PB double signal from the maintenance console 7 or the center 8. The request signal is received and identified by the PB signal reception identification unit 3 and notified to the control unit 4, and the control unit 4 controls the return selector unit 2 to form a return circuit,
This loopback circuit is used to conduct a loopback test from the maintenance console 7 or center 8, and the case is shown in which a data transmission device is connected via the switching network 6, and 5 is a data terminal device.

[Effect]

When transmitting data with the center 8 upon request from the data terminal device 5, the center 8 is called and the line is connected via the switching network 6, and the center 8 sends out an answer back tone (ABT). When the data transmission device detects this answer back tone, data transmission is started. Further, when a return circuit formation request signal based on a PB double signal is sent from the center 8 or the maintenance console 7, the PB signal reception identification section 3 identifies the reception and notifies the control section 4. The control section 4 controls the return selector section 2 to form a return circuit.

After the maintenance console 7 or the center 8 sends out a return circuit formation request signal using the PB double signal, it performs a return test on the data transmission device.

Since the above-mentioned answer back tone in the case of normal data transmission uses 2100 Hz, the PB signal reception identification section 3 can reliably distinguish and identify the answer back tone and the PB double signal.

〔Example〕

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

FIG. 2 is a block diagram of an embodiment of the present invention, in which 11 is a data terminal device, 12 is an interface section 13 is a modem section, 14 is a network control section, 15 is a central control section consisting of a microprocessor, etc., and 16 is a random control section. Access memory (RA
17 is a program memory consisting of a read-only memory (ROM), etc., 18 is a loopback selector section, tSa is a loopback circuit, 19 is a modem, 20
20a is a return selector section, 20a is a return circuit, 21 is a line state detection section, 22 is a PB signal reception detection section, 23 is a dial signal transmission section, and 24 is a switching section.

When the data terminal device 11 performs data transmission with a center or other data terminal device via a switching network (not shown), the loopback circuits 18a and 20a of each loopback selector section 18.20 are controlled to be in an open state. has been done. and,
Data from the data terminal device 11 is modulated into an FSK signal or a PSK signal by the modem 19, and sent to the line via the switching section 24. Further, the received FSK signal and PSK signal are applied to the modem 19 via the switching section 24, demodulated, and transferred to the data terminal device 11.

When a return test is performed from a maintenance console or center (not shown), a return circuit formation request signal is first sent out using a PB double signal. When this return circuit formation request signal is received and identified by the PB signal reception identification section 22, it is notified to the central control section 15. In this case, the return circuit formation request signal specifies whether it is the return circuit 18a of the return selector section 18 or the return circuit 20a of the return selector section 20. , return circuit 18
a or a folded circuit 20a is formed.

The maintenance console or center is notified of the formation of the loopback circuits 18a, 20a, or after a predetermined period of time, the maintenance console or center sends test data and performs a loopback test.

FIG. 3 is a procedure explanatory diagram of an embodiment of the present invention. In the case of general data communication, for example, a call is made from a center, and a switching network sends a paging signal to a data transmission device in accordance with call information. When the network control section of the data transmission device detects this paging signal and responds, the switching network sends a response signal to the center in response to the response. The center receives and identifies this response signal and sends out an answer back tone ABT (2100Hz). The network control unit of the data transmission device starts data communication between the data terminal device and the center by detecting this answer back tone ABT.

In the case of a loopback test, for example, a call is made from the center, the data transmission device is called via the switching network, and in response, the center sends a loopback circuit formation request signal using a PB double signal. A loopback circuit is formed by receiving and identifying the PB signal in the network control device of the data transmission device, and test data is sent from the center to perform a loopback test.

FIG. 4 is a flowchart of an embodiment of the present invention. In the state (2) of waiting for a calling signal, it is determined (2) whether or not a calling signal is detected, and when the calling signal is detected, a response is returned (2). Then, it is determined whether or not the answer back tone ABT (2100Hz) is detected, and this answer back tone ABT
If you do ★, it is a case of general data communication, so perform data communication■.

Also, if the answer bank tone ABT is not detected, P
It is determined whether or not the B-times signal has been detected.■. The answer back tone ABT is a signal with a single frequency of 2100 Hz, and is a signal that combines two frequencies of the PB double signal, so it can be easily identified and detected. If the PB double signal is not detected, the process returns to the first call signal waiting state (2).

In addition, when the PB double signal is detected, the formation request signal PB1 (for example, *
O1), and if the signal FBI is detected,
In order to conduct the network control section loopback test (2), a loopback circuit 20a in the loopback selector section 20 is formed. If the signal PBI is not detected, the loopback circuit 1 in the loopback selector section 18
It is determined whether or not the formation request signal PB2 (for example *02) of 8a is detected. If the signal PB2 is detected, the modem loopback test [
A folding circuit 18a in the folding selector section 18 is formed in order to carry out the phase]. Also, even if the PB multiplied signal is detected, the signal PB
1. If it is neither PB2, it is not a return test, and the process returns to the state (2) of waiting for a call signal.

As mentioned above, the center or maintenance console sends a return circuit formation request signal using the PB double signal, and in the data transmission device, the PB signal reception identification unit 22 identifies the reception, and the central control unit 15 establishes the return circuit. It is possible to perform loopback tests by sending test data from the center or maintenance console, and even when a large number of loopback circuits are provided, the By using the signals, the formation of selected loopback circuits can be performed from the center or maintenance console.

〔Effect of the invention〕

As explained above, the present invention provides the data transmission device 1 with
A return selector unit 2 in which a return circuit is formed by a control unit 4 including a microprocessor, etc., and a maintenance console 7
Alternatively, a PF3 signal reception identification unit 3 is provided to receive and identify a return circuit formation request signal based on a PB double signal sent from the center 8 during a return test, and to form a desired return circuit from the maintenance console 7 or the center 8. Return tests for periodic maintenance, fault isolation, etc. can be easily performed from the maintenance console 7 or center 8 located away from the data transmission device 1, and return tests can be performed in a short time. There are advantages that can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a diagram explaining the principle of the present invention, FIG. 2 is a block diagram of an embodiment of the present invention, and FIG. 3 is a diagram explaining the procedure of an embodiment of the present invention.
FIG. 4 is a flowchart of an embodiment of the present invention, and FIG. 5 is an explanatory diagram of a conventional example. 1 is a data transmission device, 2 is a return selector section, 3 is a PB signal reception identification section, 4 is a control section, 5 is a data terminal device, 6 is a switching network, 7 is a maintenance console, and 8 is a center.

Claims (1)

[Claims] The data transmission device 1 is provided with a return selector section (2) controlled by a control section (4) and a PB signal reception identification section (3) for receiving and identifying a PB signal, and a maintenance console ( 7) Or, the PB signal reception identification unit (3) receives and identifies a return circuit formation request signal based on a PB signal from the center (8) and notifies the control unit (4), and the control unit (4) A loopback test control method characterized in that a loopback selector section (2) is controlled to form a loopback circuit, and the loopback test is performed from the maintenance console (7) or the center (8).