JPH03265261A - Channel setting test equipment - Google Patents

Abstract

PURPOSE:To facilitate confirmation of a channel by one person and to fully automate the test operation by sending a PB dial signal to a channel to confirm the setting of the N channel. CONSTITUTION:A PB dial transmission circuit is provided in a pseudo stations section 11 of a function test equipment A of a private branch of exchange D and a PB dial receiver is provided in a signal monitor section 13 respectively. When the test stage reaches the confirmation of channel setting during a series of test operation, the PB dial transmission circuit and the PB dial receiver are connected to an external line accommodation terminal and an extension accommodation terminal of the exchange D switchingly alternately so as to confirm a channel path in 2-way. Moreover, a PB dial signal for channel path check is inputted separately to both the external line accommodation terminal and the extension accommodation terminal of the exchange D to allow the system to check both the transmission speech path and the reception channel path easily when the exchange D is of a digital type.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a function testing device for a private exchange, and more particularly to a call path setting test device for checking a call path set in a private exchange. It should be noted that the term "private exchange" here includes all telephone systems having a switching function, such as private branch exchange equipment and key telephone equipment.

[Conventional technology]

A function test device for a private exchange usually includes a pseudo local section that simulates the operation of a central office switch installed in a telephone exchange, and a signal monitoring section that monitors signals sent and received between the pseudo local section and the private exchange under test. Normally, it is possible to determine whether the communication path has been correctly set up in the private exchange by actually making a call between the telephone connected to the internal accommodation terminal side of the private exchange and the telephone connected to the above-mentioned pseudo local area. I've confirmed it.

[Problem to be solved by the invention]

According to the conventional test equipment mentioned above, since it is necessary to actually make a call between the extension side of the private exchange and the test equipment, at least two people are required for test operation, and one person is required to confirm the setting of the call route. It is not possible to fully automate and test all connection control sequences because of the need for intervention.

In addition, especially in cases where the private exchange uses a time-division digital system, the call path is set up separately for the outgoing call path and the received call path (so-called 4-wire communication path). In this case, if a failure occurs in the setting of one of the call paths, if the person performing the test operation is separated from the operator on the extension line and the operator on the test equipment side, When communication between the two parties cannot be established, and when both operators are in the same location, voices other than those transmitted through the telephone can be heard, making it difficult to confirm that it is a one-way call. You may even miss it.

The present invention is proposed in order to solve the above problems, and it is possible to confirm the setting of the communication path even with one test person, and it is possible to fully automate the test of the connection control sequence.
In the case of a private exchange in which outgoing call paths and incoming call paths are set separately, it is an object of the present invention to provide a test device that can confirm the setting of both call paths.

(Means for Solving the Problems) In order to solve the above problems, in the present invention, a functional test device for a private exchange usually includes a PB dial sending circuit in its pseudo local section and a PB dial receiver in its signal monitoring section. During a series of test operations, when it came to the confirmation stage of the call route setting, the PB dial exit circuit and the PB dial receiver were connected to the outside line receiving terminal side and the extension line receiving terminal side of the private exchange, respectively. Connect alternately to
The call path is confirmed in both directions.

[Function] In the present invention, a PB dial signal is sent to the communication path to confirm the setting of the communication path, so unlike the case of actually making a call, one person can confirm the communication path, and the test Full automation of operation is possible.

In addition, the PB dial signal for call path check is
By inputting the information separately for both the extension line receiving terminal side and the outside line receiving terminal side of the private exchange, it is easy to check both the outgoing call path and the received call path when the private exchange is a digital exchange. I can do it.

〔Example〕

Figures 1 and 2 show an embodiment of the present invention. Figure ei1 is a block diagram showing the test equipment together with related private exchanges, central office exchanges, and dial-in lines. Figure J2 is a block diagram showing the basic test unit in detail, and Figure 3 is a diagram showing the PBX incoming call connection sequence.

This embodiment is an example in which the present invention was implemented in a PBX dial-in function testing device.

As shown in FIG. 1, the PBX dial-in test device (hereinafter referred to as the test device) according to the embodiment of the present invention includes a test device main body A, and a line side control unit connected to the test device main body A by a cable. It consists of a section B and an extension side operation section B, which are housed in a portable case, and the line side operation section B and extension side operation section C can be pulled out of the case. .

In Figure 1, D is a private exchange equipped with PBX dial-in service, such as a private branch exchange or key telephone device, E is a central office exchange, and F is a private exchange installed between the private exchange and the central office exchange E. The dial-in line, G, is an extension telephone housed in the extension of the private exchange.

To explain the configuration of the test device main body A, the test device main body A collectively controls the operation of the basic test unit 1 and the expansion test unit 2, which include various circuit sections for PBX dial-in function testing, and the test device. A ROM that stores fixed data such as CPU3 and CPU3 processing programs.
4. RA that stores variable data such as functional test data
M5, a display section 6 for displaying functional test results, etc., a main body operation section 7 for switching test modes, etc., and a common bus 8, which is a common data transmission path between the sections 1 to 7 described above.

The basic test unit 1 also includes a pseudo local section 11 that operates in the same manner as the central office exchange E and the dial-in line F in the PBX dial-in incoming call connection sequence;
1 to the dial-in line accommodation terminals a1 to a of the private exchange
n side (corresponding to the line under test, e.g. a
l), one of the dial-in line accommodating terminals 81 to an side of the private exchange, and one of the extension accommodating terminals b1 to bm (all of which correspond to the line under test). , for example, al and bl), and monitors signals sent and received between the private exchange and the central exchange E or the pseudo local section 11 as the PBX dial-in incoming connection sequence progresses; Any of the extension terminals b1xbm (for example, b
t), which operates in the same manner as the extension telephone G housed in the private exchange in response to calls received at the extension accommodation terminal b1; The calling party's telephone (not shown) belonging to the central office exchange E in the incoming connection
The telephone circuit 15 on the outside line side operates in the same manner as the above, and the CPU interface 16 for connecting each of the above-mentioned sections 11 to 14 and the CPU 3.

The expansion test unit 2 includes the signal monitoring section 13 and the CPU interface 1 of the components of the basic test unit 1.
6, and exclusively performs the function of checking signal exchange between the private exchange and the central exchange E. That is,
The expansion test unit 2 is used for maintenance of an existing private exchange that already accommodates the dial-in line F (PBX dial-in function test), and the basic test unit 1 is initially installed in the test equipment main body A. However, one or more additional test units 2 may be added as needed.

The line side operation section B is equipped with a test start operation button (not shown) and a dial-in number setting operation button (numeric keypad not shown) when using the pseudo local section 11. When the telephone circuit 15 includes a communication circuit, a microphone and a speaker (or a handset) attached to the communication circuit are provided in the line-side operation section B.

The extension side operation section C is equipped with a response operation button (not shown) for manually creating an extension response state, and when the extension side telephone circuit 14 includes a telephone call circuit,
A microphone and a speaker (or a handset) attached to the communication circuit are provided within this extension side operating section C.

Next, the configuration of the basic test unit 1 will be explained in more detail with reference to FIG. 2 in correspondence with each part shown in FIG. 1.

The pseudo local section 11 includes a polarity inversion circuit 101 and an IR generation circuit 1.
02, IR signal sending relay (hereinafter referred to as RG relay) 103, BT/RBT sending circuit 104. It is composed of a PB dial sending circuit 105 and a current supply circuit 106.

The polarity inversion circuit 101 is a circuit that has a function of inverting the polarity of a pseudo dial-in line (referring to a line connected from the pseudo local office 11 to the dial-in line accommodation terminals 81 to an of a private exchange). The polarity reversal operation on the central office exchange E side in the incoming call connection sequence is simulated.

The IR generation path 102 is a circuit that generates a calling signal (IR multiplied signal).

The RG relay 103 receives the I generated in the IR generation path 102.
This is a relay for sending an R-fold signal to the pseudo dial-in line, and has a contact rg, and simulates the IR sending operation on the central exchange E side in the dial-in incoming call connection sequence.

The BT/RBT sending circuit 104 is connected to the outside line side telephone circuit 15.
Busy tone (BT) or ring tone (RBT)
When the dial-in incoming call connection sequence advances to the connection ladder to an extension, the busy tuning fork of the central office exchange E to the calling party simulates the operation of sending out a ring back tone.

The PB dial sending circuit 105 transmits an extension designation signal (in the dial-in number,
This circuit generates and sends a PB dial signal (corresponding to a 1-4 digit number defined as an extension number), and performs the operation of sending an extension designation signal from the central office exchange E to the private exchange in the dial-in incoming call connection sequence. Do this in a simulated manner.

The current supply circuit 106 is a circuit that supplies speech current to the pseudo dial-in line and the outside telephone circuit 15.

The pseudo side connection section 12 is a pseudo station connection relay (hereinafter referred to as TA).
It's called a relay. )1o7, this TA relay 1
07 has a contact ta, and has a function of connecting and disconnecting the pseudo local section 11 to and from the pseudo dial-in line.

The signal monitoring unit 13 includes a line state detection circuit tOa, a station side IR
It is composed of a detection circuit 109, an extension side IR detection circuit 110, a PB dial receiver 111, and an audible sound monitor circuit 112.

Line status detection circuit 1 (1g is a circuit that determines the status of the dial-in line F or the pseudo dial-in line, for example, whether the line is empty or busy by detecting the voltage of the line) It is.

The central office side IR detection circuit 109 connects the dial-in line F or the pseudo dial-in line to the central office exchange E or the pseudo central unit 11.
This is a circuit that detects the IR multiplied signal sent from the IR.

The extension-side IR detection circuit 110 is a circuit that detects an IR multiplied signal sent from the private exchange to the extension.

The PB dial receiver 111 receives and identifies a signal composed of a PB signal, such as an extension designation signal (dial-in extension number) sent from the dial-in line F or the pseudo dial-in line upper office exchange E or the pseudo central office section 11. This is a circuit that does this.

The audible sound monitor circuit 112 is a circuit that monitors the extension designation signal and the voice of the call, and has sound emitting means such as a speaker.

The extension side telephone circuit 14 includes a hybrid circuit 113 and a call loop closing relay (hereinafter referred to as TB relay).
114, hands-free circuit 115 and amplifier 116
, 117.

The hybrid circuit 113 handles two types of voice calls exchanged between the extension of the private exchange and the telephone circuit 14 on the extension side.
This is a circuit for performing @-4 line conversion.

The TB relay 114 has a contact tb that is inserted between the extension line and the hybrid circuit 113, and controls the closing and opening of the DC communication loop to control the pre-response state of the extension telephone G in the private exchange. , the same operating state as when responding and ending a call is simulated.

The hands-free circuit 115 is a circuit for confirming the setting of the communication path at the private exchange by telephone at the final stage of the test, and is provided with a hands-free telephone function in consideration of the simplicity of the test. , - Numerically, a normal telephone circuit is sufficient.

Note that the speaker and microphone attached to the hands-free circuit 115 are provided in the extension side operating section C as described above.

Amplifiers 116 and 117 are circuits that amplify the received voice and the transmitted voice, respectively.

The outside line telephone circuit 15 is composed of a hands-free circuit 118, and is provided for the same purpose as the hands-free circuit 115.

Note that the microphone and speaker attached to the hybrid circuit 118 are provided in the line side operation section B as described above.

In addition to the above, the basic test unit 1 is provided with two switches l19 and 120 for implementing the invention. The switches 119 and 120 are both analog switches. is designed to switch and connect the input of the PB dial receiver 111 to the signal monitoring unit 13 (audible sound monitor circuit 112) side and the extension side telephone circuit 14 side,
The dial signal is sent to the dial line accommodation terminal a of the private exchange.
By applying power from the 0 to an side and receiving it at the extension accommodating terminals b1 to bs+, and by applying it from the extension accommodating terminals b1 to ba+ and receiving it from the dial-in line accommodating terminals 81 to an, calls to a private exchange are made. It is now possible to perform a test to check whether the path is set correctly.

Next, the operation of the test apparatus using the pseudo local section 11 will be explained with reference to the incoming call connection sequence of the PBX dial-in service shown in FIG.'s3.

When performing this test, connect the dial-in line connection terminal C1 of the test equipment main body A to the dial-in line receiving terminal to be tested on the private exchange, e.g. Connect to an extension receiving terminal, for example, bl.

This test is often carried out during the installation work of a private exchange, and in many cases the dial-in line F has not yet been accommodated in the private exchange. 12 In other words, in FIG. 1, when testing the dial-in line accommodation terminal al of the private exchange p, there is only a connection between the terminal a1 and the terminal C1 of the test equipment main body A, The terminal a1
There is no connection between the center and the central office exchange E (it is disconnected at the point marked with an X).

Prior to the test, a test using a pseudo dial-in line is first selected using a mode setting switch (not shown) on the main body operation section 7 of the test apparatus main body A. With this operation, CPU3
controls the pseudo station connecting section 12 via the common bus 8 and the CPU interface 16, and all signals are exchanged between each section in the basic test unit 1 and the CPU 3 via the CPU interface 16 and the common bus 8. In the following description, the CPtJ interface 16 and the common bus 8
(The explanation of the presence of this will not be discussed in detail.) The pseudo local section 11 is coupled via the terminal C1 to the dial-in line receiving terminal under test of the private exchange, in the example shown in FIG. 1, the terminal a1. That is, in FIG. 2, the TA relay 107 operates, its contact ta closes, and the polarity inversion circuit 101 etc. are connected to the terminal C1.

Next, by operating the line-side operation unit B, the dial-in extension number of the extension to be tested in the private exchange, in the example shown in FIG. 1, the dial-in extension number assigned to the extension receiving terminal bl is set. When this dial-in extension number setting operation is performed, the dial-in extension number input from the line-side operation section B is stored in the RAM 5 under the control of the CPU 3.

There are two test methods: a method in which the entire sequence of PBX dial-in incoming call connections is performed automatically and continuously (automatic test mode), and a method in which the call path setting of the private exchange is manually confirmed (manual test mode). It is configured so that two types of tests can be performed. First, a case will be described in which a method of performing continuous automatic testing is selected (this selection is made by selecting the automatic test mode on the main body operation section 7).

When you perform a test start operation on the line side operation unit B (press the test start button), the CPU 3 first operates the polarity inversion circuit 10.
1 to invert the polarity of the voltage applied by the current supply circuit 106 to the pseudo dial-in line. As a result, as shown in Fig. 3, a polarity inversion signal is sent to the private exchange from the pseudo local section 11 of the test equipment main body A, and the central exchange E of the PBX dial-in incoming call connection is sent.
This means that the sequence of the first stage on the side was performed in a simulated manner. Note that this polarity inversion signal is transmitted to the line state detection circuit 108.
The display section 6 displays that the polarity has been correctly inverted under the control of the CPU 3.

When the polarity reversal signal has finished exiting, the CPU 3 then operates the IR generation path 102 to generate an IR flaw signal and to generate an R signal.
The G relay 103 is operated to send the IR multiplied signal output from the IR generation circuit 102 to the dial-in line accommodation terminal a1 of the private exchange via the IR double signal terminal C1. this! The sending operation of the R-number is confirmed within the main body A of the test device. That is, the station side IR detection circuit 109 performs IR signal detection, the detection information is sent to the CPU 3, and is displayed on the display unit 6 under the control of the CPU 3.
This means that the sequence of steps 1J2 on the central exchange E side of the X dial-in incoming call connection has been simulated. At this time, the BT/RBT sending circuit 104 is activated and a ringing tone (RBT) is sent to the speaker of the line side operation section B.

If the private exchange is in good working order, the above IR
Upon receiving the double signal, the private exchange sends a primary response signal to the dial-in line accommodation terminal al. That is,
- The next response signal is a signal sent by closing a DC loop to the terminal a1 (the voltage change in the line due to the closing becomes the signal), and this signal is transmitted via the terminal C1. (The opening of the DC loop is detected by the voltage drop of the pseudo dial-in line when the DC loop is closed.), and the detection information is read by the CPU 3, so that the display unit 6
The message indicates that the private exchange's primary response was successful.

If the primary response of the private exchange is successfully detected, then C
The PU 3 controls the PB dial sending circuit 105 and sends an extension designation signal to the private exchange based on the dial-in extension number stored in the RAM 5 by the dial-in extension number setting operation. That is, the extension designation signal output from the PB dial exit circuit 105 is sent to switch 1.
19, hands-free circuit 118, current supply circuit 106,
The signal is sent to the terminal C1 via the contact rg, the polarity reversing circuit 101, and the contact ta, and is manually input to the terminal a1 of the private exchange. By the above-described operation of sending out the extension designation signal, the sequence of the third stage on the central office exchange E side of the PBX dial-in incoming call connection has been simulated. Note that the sending operation of this extension designation signal is confirmed within the main body A of the test apparatus. That is,
The received information is audibly confirmed by the audible sound monitor circuit 112 and received by the PB dial receiver 111, and the received information is sent to the CPU 3 and displayed on the display unit 6 under the control of the CPU 3.

In the control so far, it has been explained that the signal sent from the pseudo local section 11 (polarity inversion signal, IR double signal extension designation signal) is checked by the signal monitoring section 13, but the signal is Considering that it is extremely rare for an abnormality to occur in the transmission of the signal, it is not necessary to perform the above-mentioned signal confirmation operation.In this case, under the control of the CPU 3, Office line IR detection circuit 109, line state detection circuit 108, and PB receiver 11
1 is inactive.

If the operation of the private exchange is normal, the private exchange receives the extension designation signal and sends an IR double signal to the extension accommodation terminal b1 corresponding to the extension designation signal. This terminal b1
The test equipment main body A via the IR double signal terminal d sent to
is input. In other words, the above IR input manually to terminal d
The doubled signal is detected by the extension side IR detection circuit 110, and this detection information is read by the CPU 3 and displayed on the display unit 6.
Receipt of R signal is displayed. This makes it possible to confirm that the receiving operation of the dial-in extension number (extension designation signal) and the IR sending operation within the private exchange have been carried out normally.

Further, the private exchange transmits a reception confirmation signal for the extension designation signal (an extension designation signal reception completion signal) to the dial-in line accommodation terminal a1 at the same time as, or before or after, the transmission of the IR double signal. This confirmation signal is a signal sent by opening the DC loop closed to the terminal a1 (the change in line voltage due to opening becomes the signal),
This signal is detected by the line state detection circuit 108 (
Detected by the voltage rise on the pseudo dial-in line when the DC loop is opened. ), the detection information is read into the CPU 3, thereby displaying on the display section 6 that the private exchange has successfully sent out the confirmation signal.

When the normal reception of the above IR flaw signal is confirmed, the CPU3
operates the TB relay 114 and closes its contact tb. This operation is a response operation by the extension side telephone circuit 14, that is, an operation to complete the DC loop via the hybrid circuit 113 to the extension accommodation terminal b□ of the private exchange, and is an operation for completing the DC loop via the hybrid circuit 113 to the extension accommodation terminal b1. This is equivalent to the response operation by extension telephone G.

When the DC loop is closed to the extension accommodating terminal a1 of the private exchange as described above, the private exchange closes the DC loop to the dial-in line accommodating terminal a1, thereby creating a pseudo dial-in line. A secondary response signal (the voltage drop in the line due to DC loop closure serves as a signal) is sent to (pseudo station line section 11). This secondary response signal is detected by the line status detection circuit 108 in the same manner as when detecting the -next response signal, and the detected information is read into the CPU 3, so that the secondary response operation is performed on the display section 6 &: private exchange. A message indicating successful completion will be displayed.

After a communication path is set up in a private exchange, a test to confirm the setting of the communication path is performed as follows. That is, the CPU 3 operates the switch 120 and activates the PB dial sending circuit IQ5. The following path for the PB scratch signal output from the PB dial sending circuit 105: PB dial sending circuit 105 - switch 119 (non-operating) - hands-free circuit 118 - current supply circuit 106 - contact rg (non-operating) - polarity inversion circuit 101 -Contact ta
(Operation) One terminal c1 (inside test equipment body A) - Dial-in line accommodation terminal a1 - Private exchange p communication path (
Receiving side communication path) - extension accommodation terminal bs (inside private exchange) → terminal d → contact tb (operation) → high 19
91 circuit 113 - amplifier 116 - switch 120 (operation) - PB dial receiver 111 (test equipment main body A
) is received by the PB dial receiver 111, and the CPU
3 reads the PB signal reception from the PB dial receiver 111, it displays on the display unit 6 that the receiving side communication path (receiving communication path) within the private exchange has been set normally.

Next, the CPU 3 operates the switch 119, restores the switch 120, and outputs a PB flaw signal from the PB dial sending circuit 105. The following route for the PB scratch signal output from the PB dial sending circuit 105: PB dial sending circuit 105 → switch 119 (operation)
→Amplifier 11f →Hybrid circuit 113-contact tb
(Operation) 1 terminal d (inside the test equipment body A) - Extension accommodation terminal b1 - Communication path to private exchange (calling side communication path)
- Dial-in line accommodation terminal al (inside private exchange p) - Terminal C1 - Audible sound monitor circuit 112 -> Switch 120 (inoperable) - PB dial receiver 111 (
The above is received by the PB dial receiver 111 in the test equipment main body A), and the calling side communication path (outgoing call bus) in the private exchange has been set normally, as in the case of checking the receiving side communication path above. This is displayed on the display section 6.

As described above, the setting of the call path is confirmed from the private exchange's dial-in line accommodation terminals al to an and from the extension line accommodation terminals b1 to bm. It is also possible to reliably conduct communication route setting confirmation tests for exchanges in which the communication routes are set separately for the sending and receiving sides, such as those for standard exchanges.

When the above communication path confirmation test is completed, the CPU 3 restores the TB relay 114 and performs a call termination confirmation test. In other words, when the TB relay 114 is restored and the contact tb opens, the extension terminal b1 of the private exchange is connected to the extension terminal b1 of the private exchange. The formed DC loop is opened, and as a result, the private exchange opens the DC loop of the dial-in line accommodation terminal a1, so that the voltage applied to the terminal c1 (pseudo dial-in line) by the current supply circuit 106 decreases. increases, and the line state detection circuit 108 detects this. That is, the call termination operation of the private exchange is detected by the line state detection circuit 108, the CPU 3 reads the call termination detection information, and displays on the display section 6 that the call termination process of the private exchange has been correctly performed.

The test results at each stage of the above test operation are all displayed on the display section 6 as described above, and if the operation is normal, a ring tone (RBT) is output from the BT/RBT sending circuit 104 under the control of the CPU 3. ) is output and audibly displayed on the speaker C of the line side operation section B, and data indicating the test result is stored in the RAM 5 under the control of the CPU 3.

In addition, when an abnormality is found in the above series of test operations, the CPtJ3 displays the abnormality on the display unit 6 (displays the abnormality).
Then, the BT/RBT sending circuit 104 is activated to send a busy tone (BT) to the speaker of the line-side operation unit B to audibly display the discovery of an abnormality, and after storing the abnormality data in the RAM 5, the corresponding Test operation is stopped when an abnormality occurs. Note that the accumulation of test data in the RAM 5 is limited to accumulation of abnormal data by selecting the accumulation method in the main body operation section 7, considering the case where many lines are tested at once. This allows overflow to be prevented.

The above operation is an operation that automatically performs the entire sequence of PBX dial-in incoming call connection. In consideration, in this example,
Of this sequence, it is also possible to proceed manually from the call path setting stage onward.

That is, when the manual test mode is selected on the main body operation section 7, the CPU 3 stops proceeding with the above sequence at the time when it receives and confirms the secondary response signal from the private exchange. Here, it is possible to perform a confirmation test on the setting of the communication path using the PB dial signal by manual operation.

In addition to the above, this test device is also capable of checking the transmission and reception of signals in the PBX dial-in incoming call connection sequence for the installed dial-in line F. In this test of the actual line (referring to the line that has already been installed), the expansion test unit 2 is used to enable testing of multiple lines at the same time, but this test operation is not directly related to the present invention, so details are not provided. Not mentioned.

In addition, although the above embodiment is an example in which the present invention was implemented in a PBX dial-in function test device, it is not limited to this.
The present invention can be implemented with any testing device as long as it tests the functionality of a private exchange.

[Effects of the Invention] As explained above, the present invention utilizes a PB dial sending circuit and a PB dial receiver that are normally provided in the function test equipment of a switching equipment, and enables both the extension receiving terminal side and the outside line receiving terminal side of a private switching equipment to be used. This is to check the settings of the incoming call bus, and since there is no need to actually make a call during the test, the entire series of test operations can be automated, and one person is sufficient for the test. Furthermore, since the setting of the communication path is confirmed by a two-way check, the test can be performed even if the private exchange is a 4-wire digital exchange.

As described above, the present invention has various advantages and its effects are extremely large.

[Brief explanation of drawings]

The drawings are all for explaining the present invention in detail: Figure 21 is a block diagram of the entire embodiment, Figure 2 is a detailed block diagram of the basic test unit, and Figure 3 explains the PBX dial-in incoming connection sequence. It is a diagram. (Main symbols) A - Test equipment body D... Private exchange E.
・Central exchange F・・・Dial-in line L・
...Basic test unit 3...CPU 11...Pseudo station line section 12...Pseudo side connection section 13...Signal monitoring section 105-PB dial exit circuit 111-...PB dial receiver 119゜120.・Switch diagram 1

Claims (1)

[Claims] 1 Having a pseudo local section and a signal monitoring section, proceeding with the telephone exchange connection sequence between the pseudo local section and the private exchange, and detecting signals exchanged between the pseudo local section and the private exchange with the signal monitoring section. As a result, in the test equipment designed to perform the function test of the private exchange, the signal monitoring section was
The B dial receiver includes a PB dial sending circuit in the pseudo local part, and the PB dial receiver and P
Switches for selectively connecting the B dial sending circuit to the outside line receiving terminal side and the extension line receiving terminal side of the private exchange are provided corresponding to the PB dial receiver and PB dial sending circuit, respectively. A call path setting test device that enables bidirectional checking of a call path set in a private exchange by switching.