JPH02309855A - Inter-station test channel connection system - Google Patents

Abstract

PURPOSE:To select a connection path freely by providing a test circuit having a call relay function to each exchange of an exchange network so as to call the test circuit of the relay exchange in existence on the way up to the object test circuit from a test board sequentially. CONSTITUTION:When the operator commands a channel test to a test circuit 2 of an incoming side exchange 14 through a path via a relay exchange 13 from a keyboard of a test board 1, a CPU 105 of the test board 1 reads a data stored in advance in a ROM 106 and recognizes it that test circuits 4, 3 of relay exchanges 12, 13, and a test circuit 2 of the incoming side exchange 14 are called in this order. Then the CPU 105 dials a number of a subscriber circuit of the test circuit 4 to call the test circuit 4 via a relay line 21 thereby confirming the reply. After the reply of the test circuit 4, the number of the test circuit 3 is dialed in succession to a connection request tone from the test board 1. Even when plural paths up to the object test circuit exist, the test circuit to be called on its way is revised.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an inter-office test channel connection system, and more particularly to an inter-office test channel connection system for conducting speech characteristic tests, etc. between offices in a switching network. .

[Conventional technology]

Conventionally, in this inter-office test call path test method, a maintenance person at one switch makes a call from a test stand and dials the extension number of a test circuit housed in another switch to connect the call path. Either the first method or the second method is used, in which a test call path connection command is activated from a maintenance terminal in each exchange to close the call path from the test stand to the test circuit.

[Problem to be solved by the invention]

The above-mentioned conventional inter-office test channel connection system has the disadvantage that it is difficult to connect when the relay station of the switching network is unmanned, and it is difficult to perform automated tests with intelligence on the test stand. That is, in the first method, when you want to set up a test call path by bypassing a relay station from the test stand of the originating exchange to the test circuit of the terminating exchange, it is necessary to block this detour trunk line at the relay station. Can't be automated. Furthermore, the second method requires personnel to perform command operations at each station, and therefore cannot be automated.

[Means to solve the problem]

The inter-office test channel connection system of the present invention provides a test circuit for a plurality of exchanges by calling a test circuit from a test stand housed in each exchange in a network consisting of a plurality of exchanges using the normal call processing function of that exchange. In the inter-office test communication path connection system for closing a communication communication path, the test stand is provided with a push button signal sending means, the test circuit is provided with a push button signal sending means and a push button signal detection means,
When a call is received from the test stand to the test circuit and the test stand sends dial number information using a push button signal following a predetermined specific push button signal, the test circuit accumulates the dial number information and transmits the dial number information to the test circuit. The present invention is characterized in that an incoming call from the test stand is transferred to the other party indicated by the dial number information using a call transfer function of the exchange.

゛ [Example] Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of a switching network showing an embodiment of the interoffice test channel connection system of the present invention, and FIGS. 2 and 3 are test stands in FIG. 1, respectively.

FIG. 4 is a circuit block diagram showing an example of a test circuit.

FIG. 5 is an operational flowchart of FIGS. 2 and 3, respectively.

In FIG. 1, the switching network is an originating switch 11
A trunk line 21 . The test stand 1 is connected to the originating exchange 11 via a subscriber circuit (not shown), and the relay exchange 12, 13 and the terminating exchange 14 are connected to each other.
The test circuits 4 and 3 are connected to each other via subscriber circuits (not shown).
．． 2 is connected. The test stand 1 is equipped with a push button signal (hereinafter referred to as PB signal) sending means, and a test circuit 2.3.
．． 4 includes a PB signal sending means and a PB signal detecting means.

As shown in FIG. 2, the test stand 1 is connected to the subscriber circuit of the exchange via terminals 101. PB signal sending circuit 103
is used to send a PB double signal for calling the test circuit and to send a specific PB double signal for causing the test circuit to perform transfer.

The PB signal sending circuit 103 can be configured with a push button signal sending IC for general push button telephones, etc.
It is connected to the PU bus 112, and can send out the necessary PB multiplication signal under the control of the CPU 105. R.O.
M106. The RAM 107 is a memory for storing programs and a memory for storing data for the CPU 105, respectively.The call/recovery control circuit 102 is a circuit for the test bench 1 to make and recover calls to the subscriber circuit. CP in case
The control of U 105 closes the DC loop for the subscriber circuit and opens the DC loop in case of restoration. However, the audio signal, which is an AC signal, is transmitted to the audio signal addition/separation circuit 108 regardless of whether the DC loop is open or closed.

The voice signal addition/separation circuit 108 is the call origination/recovery control circuit 10
2 is distributed to the PB signal detection circuit 104 and line test circuit 109, and the voice signals output from the PB signal sending circuit 103 and line test circuit 109 are mixed and sent to the call origination/recovery control circuit 102. . Although the PB signal detection circuit 104 is not essential to implementing the present invention, it is used to receive a PB double signal sent by the test circuit in order to quickly detect a response from the test circuit on the called side or a connection abnormality discovered on the test circuit side. It is set up for the purpose of In addition, after the communication path between the test stand and the test circuit is closed, the line test circuit 109 is used to face the line test circuit in the test circuit and measure call attenuation, noise, ground balance, etc. Although this circuit is not directly related to the test communication path connection of the present invention, detailed explanation will be omitted. In addition, the test stand 1 has a keyboard for the operator to instruct test items, test start, etc., and a display type for displaying results, etc., and these are used as a keyboard monitoring circuit 110 and a display panel control circuit 111, respectively. The CPU 105 is connected to the CPU bus 112.
is under the control of.

Test circuit 2 is then connected to the subscriber circuit of the exchange via terminal 201, as shown in FIG.

The PB signal sending circuit 203 is used to send a transfer destination dial number when transferring an incoming call from the test stand. Although the PB signal sending circuit 203 is not essential to the present invention, the PB signal sending circuit 203 also sends a specific PB signal indicating that an incoming call has been answered, or a specific P signal indicating that an abnormality has occurred in connection control.
It is also used for B-fold signal transmission. PB signal sending circuit 203
can be configured with a general IC as in the case of test stand 1, and is connected to the CPU bus 210 and connected to the CPU 205.
The necessary PB multiplied signal is sent out under control.

The PB signal detection circuit 204 is used to receive a PB multiplied signal sent from a test stand or other test circuit. P
The B signal detection circuit 204 can be configured by a general IC for PB signal reception, and is connected to the CPU bus 210 so that the received PB multiplied signal CPU 205 can be read.

ROM206. The RAM 207 is a program storage memory and a data storage memory for the CPU 205, respectively.

The incoming call response/recovery control circuit 202 is a circuit for the test circuit 2 to respond to and restore incoming calls to the subscriber circuit of the exchange. When closed, the DC loop is opened in case of restoration. In addition, the CPU 205 rectifies and detects the ringing signal supplied from the subscriber circuit when a call arrives.
The 0 call response/recovery control circuit 202, which also has a function of detecting the presence or absence of an incoming call from a subscriber circuit, transmits the voice signal to the voice signal addition/separation circuit 208 regardless of whether the DC loop is open or closed. The audio signal addition/separation circuit 208 distributes the audio signal received from the incoming call response/recovery control circuit 202 to the PB signal detection circuit 204 and line testing circuit 209, and also distributes the audio signal from the PB signal sending circuit 203 and line testing circuit 209. The 0 line test circuit 209, which mixes the signals and sends them to the incoming call response/recovery control circuit 202, is a circuit that faces the line test circuit 109 shown in FIG. 2 and performs a call test.

Next, the operation sequence of the test stand 1 and the test circuit 2 will be explained with reference to FIGS. 4 and 5.

Referring to FIG. 4, the test stand 1 first becomes the first relay point where the CPU 105 reads out the connection route stored in advance in the ROM 106 by inputting the destination to be tested from the keyboard. The number of the test circuit is dialed using the PB signal sending circuit 103. After confirming the response of the first test circuit, the number of the second test circuit is then dialed. This dialed number is transferred by the transfer function of the test circuit, which will be described later, and a second test circuit is called. After confirming the response of the second test circuit, the CPU 105 dials the number of the third test circuit from the PB signal sending circuit 103,
Thereafter, the target test circuit is called up and tested by sequentially repeating the relay in the same manner. Note that the monitoring timer during Flowch□Yard is activated by CPU 1 when waiting for a response from the other party.
Although this is a software timer to prevent 05 from entering an infinite loop, it is not an essential condition for the present invention.

Next, referring to FIG. 5, the CPU 205 first detects that there is an incoming call, and then responds to the 0 incoming call detection function.
The response is executed by the incoming call response/recovery control circuit 202.
Next, the CPU 205 activates the PB signal sending circuit 203 to send out a response tone. As long as the response tone is determined in advance between the test stand and the test circuit, any of the PB double signals may be used, but '*J is preferable to the numeric signal because it is less likely to malfunction.
,”Better results can be obtained by using signals such as “#J”.

In addition, by configuring the response signal from multiple PB signals and assigning a different response signal to each test circuit in the exchange network, the test/test bench side can reliably identify which test circuit does not respond. It is also possible. Following the sending of the response signal, the CPU 205 receives the PB multiplied signal P from the test stand.
If the received PB double signal test start tone is waiting to be detected by the B signal detection circuit 204, then the line test circuit 209 is activated to enter the test execution state. Here, if a connection request tone is received instead of the test start tone, the CPU 205 first receives the subsequently sent PB double signal dial information at the PB signal detection unit 204,
Next, hooking is performed by instantaneously opening the DC loop of the incoming call response/recovery control unit 202. This is because a normal exchange performs hooking during a call to activate a call transfer function that transfers the call in progress. Because I can,
If another function is provided for call transfer, prepare a corresponding circuit. After hooking, CP
The U205 sends the dial information based on the previously received PB double signal from the PB signal sending circuit 203 and waits for a response signal from the other party. If a response signal is detected, the CPU 205 opens the DC loop of the incoming call response/recovery control unit 202. and recover,
Transfers the incoming call from the test stand to the next test circuit and ends the operation. If no response is detected, hooking is performed again and the transfer is stopped, and then an abnormal termination tone is sent and the operation is ended.

Next, the operation of the test stand and the test circuit will be described in detail, taking as an example the case where the test circuit 2 of the destination exchange 14 is called from the test stand 1 in the switching network of FIG. 1 to perform a test.

First, the operator enters the relay switch 13 from the keyboard of the test stand 1.
Instructs to test the communication path to the test circuit 2 of the destination exchange 14 via the route. CPU 105 on test stand 1 is R
Read the data stored in advance in OM106,
For this test, test circuit 4 of transit exchange 12.13,
31 Knows that the calls should be made in the order of the test circuits 2 of the destination exchange 14 6 Next, the CPU 105 dials the number of the subscriber circuit of the test circuit 4, calls the test circuit 4 via the trunk line 21, and calls the test circuit 4. Check the response. After the test circuit 4 responds, the test bench 1 dials the number of the test circuit 3 following a connection request tone. Test circuit 4 is test circuit 3
When the receiver picks up the number, after hooking, it sends out the number of test circuit 3 and calls test circuit 3 via relay line 22. When test circuit 3 responds, test circuit 4 is restored. The test stand 1 is connected to a test circuit 3. The test bench 1 sends out a response request tone, and when the test circuit 3 returns the response tone, it dials the number of the subscriber circuit of the test circuit 2 following the connection request tone.

Test circuit 3 transfers the incoming call from test stand 1 to test circuit 2 in the same manner as test circuit 4, and finally test stand 1 and test circuit 2 are connected. The test bench 1 then sends a test start tone to the test circuit 2, and thereafter tests the communication path.

Although this explanation shows an example in which the operator of the test stand 1 instructs the connection to the test circuit 2, it is also possible to program in advance to automatically test the test circuits in the exchange network sequentially, including route changes. is also possible. Furthermore, for ease of explanation, an example was shown in which the test stand and test circuit are connected to the exchange via the subscriber circuit, but in the case of a digital exchange, voice signals are transmitted and received as PCM signals,
Operations such as call origination and recovery can also be realized by configuring the test stand or test circuit CPU to communicate with the exchange CPU via an interface. PC
When transmitting and receiving an audio signal as an M signal, as shown in Fig. 2,
As shown in the example in Figure 3, the PB signal sending circuit and PB signal detection circuit are configured using an analog IC, and the PCM/analog conversion is performed using a codec, and the PCM is stored in the ROM.
A method of configuring a PB signal sending circuit that generates a PB double signal by storing a signal and sequentially reciting the signal, and configuring a PB signal detection circuit that is realized by having a signal processor execute a program for detecting the PB signal. There is.

〔Effect of the invention〕

As explained above, the present invention provides a test circuit with a call relay function in each exchange in a switching network, and sequentially calls the test circuits of the relay exchanges that exist on the way from the test bench to the target test circuit. Therefore, even if there are multiple routes to the target test circuit, it is possible to change the test circuit to be called midway, and therefore the connection route can be freely selected. In particular, since the switch to which the present invention is applied does not require any special functions other than a call transfer function, it can be easily introduced into an existing network. Also,
Since there is no need for intervention by a maintenance person at the relay station to connect the communication path, this method has the advantage that it can be executed as an automatic test.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a switching network showing an embodiment of the interoffice test channel connection system of the present invention, and FIGS. 2 and 3 are test stands in FIG. 1, respectively.

FIG. 4 is a circuit block diagram showing an example of a test circuit.

FIG. 5 is an operational flowchart of FIGS. 2 and 3, respectively.

1...Test stand, 2,3.4...Test circuit, 11...
- Originating exchange, 12.13... Relay exchange, 14.
... Calling side exchange, 21, 22. 23, 24 ... Trunk line, 101.201 ... Terminal, 102 ... Call origination/recovery control circuit, 103, 203 ... PB signal output diagram Path 104.204... PBB number detection circuit, 105, 20
5...CPU, 106.206...ROM, 107
゜207...RAM, 108.208...Audio signal addition/separation circuit, 109.209...Line test circuit, 1
DESCRIPTION OF SYMBOLS 10... Keyboard monitoring circuit, 111... Display panel control circuit, 112, 210... CPU bus, 202...
- Incoming call response/recovery control circuit.

Claims (1)

[Claims] An interoffice test in which a test circuit is called from a test stand housed in each exchange in a network consisting of a plurality of exchanges using the normal call processing function of that exchange, thereby establishing a test communication path to the plurality of exchanges. In the communication path connection method, the test stand is equipped with a push button signal sending means, the test circuit is equipped with a push button signal sending means and a push button signal detecting means, and after a call arrives from the test stand to the test circuit, the test When the test circuit transmits dial number information by a push button signal following a predetermined specific push button signal from the test bench, the test circuit stores the dial number information and uses the call forwarding function of the exchange to transfer an incoming call from the test bench. An interoffice test call path connection method characterized in that the call is transferred to the other party indicated by the dial number information.