JPH0131747B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a test method, and more particularly, to a test method for confirming whether a line is correctly connected to a line accommodation terminal of a new switch when replacing a switch.

When replacing an exchange with a new exchange, first install the new exchange, and then connect the subscriber line accommodated in the corresponding subscriber line accommodation terminal of the existing exchange to the subscriber line accommodation terminal of the new exchange. Connect in parallel. That is, for example, the subscriber line with telephone number 0001 is connected to the terminal of the new exchange with the corresponding telephone number (0001). The above connections must be made for all subscriber lines and other lines before disconnecting the existing switch.

As is well known, the external cable connecting the subscriber telephone is connected to the terminal of the main distribution board MDF inside the station.
Furthermore, the terminals of the main distribution board are jumpered to the line accommodation terminals of the exchange.

When replacing a switch, after installing the new switch, perform the above jumper between the new switch and the main distribution frame MDF. If the above jumper is performed on all lines, it becomes possible to disconnect the existing exchange.

However, if the terminals of the main distribution board MDF are mistakenly jumpered to the unsupported subscriber accommodating terminals of the new exchange, the connection will be incorrect and inconvenient when the new exchange is replaced. To avoid this, it is necessary to check whether the jumper to the new exchange was performed correctly and to correct any incorrect jumpers. For this reason, it is necessary to test that each subscriber has been correctly jumpered to the new exchange, but the number of subscribers accommodated in one exchange is several thousand to tens of thousands, and the main distribution board MDF must be tested. Since the jumper wires are usually densely packed and the main distribution frame MDF and switchboards are located far apart, the above test is extremely complicated and no efficient testing method is known.

An object of the present invention is to provide a test method that can efficiently execute the above test.

The invention will now be described with reference to the drawings.

FIG. 1 is a connection diagram of an example of a known exchange that can be used as a new exchange in which the present invention can be implemented when replacing the exchange. In the figure,
TDNW is a time-division digital communication network, LC ₁
~LC _o is the subscriber circuit, SEL is the selection circuit, TE is the test equipment, S ₁ ~ S _o is the subscriber telephone, SL ₁ ~ _{S o} is the subscriber line (analog line), and MDF is the main distribution board.

The call signal from subscriber telephone S ₁ is sent to the subscriber line.
SL ₁ , reaches the subscriber circuit LC ₁ via the main distribution board MDF, and the test relay T ₁ provided for each subscriber circuit (the winding is not shown, only its contacts t ₁ ⁰ and t ₁ ¹ are shown) It enters the circuit LCC ₁ through contacts t ₁ ⁰ and t ₁ ¹ , where it is converted into 2-wire and 4-wire data, digitized (coded), and input to the communication network TD-NW.
The digitized call signal from the TDNW is output to the circuit LCC ₁ of the subscriber circuit LC ₁ , where it is decoded and converted into an analog signal by 4 wires and 2 wires.
It reaches telephone set S ₁ via contacts t ₁ ¹ and t ₁ ⁰ , main distribution board MDF, and subscriber line SL ₁ . The same applies to other subscriber telephones ~S _o . In addition, the digital communication network
In TDNW, as is well known, a communication channel is set up between two subscriber lines to enable communication.

Subscriber line SL ₁ and subscriber circuit LC ₁ especially the circuit
To test LCC ₁ , test relay T ₁ provided in the corresponding subscriber circuit LC ₁ is operated. Due to the operation of this test relay T ₁ , contacts t ₁ ⁰ and t ₁ ¹ switch, and the subscriber line SL ₁ passes through the contact t ₁ ⁰ , and the circuit LC ₁ passes through the contact t ₁ ¹ , respectively, to the selection circuit SEL. The selection circuit SEL is connected to the lines l ₀ and l ₁ of the test line TL ₁ , and the selection circuit SEL selects the test line TL ₁ corresponding to the subscriber to be tested.
and connect the lines l ₀ and l ₁ to the input terminals tl ₀ and tl ₁ to the test equipment TE, respectively. Input end tl ₀ and tl ₁ are connectors
Connected via CON to the measuring instrument M and the test telephone TT, respectively. i.e. subscriber line
SL ₁ and the circuit LCC ₁ of the subscriber circuit LC ₁ are split and are drawn into the measuring device M of the test device TE and the test telephone TT via contacts t ₁ ⁰ and t ₁ ¹ of the test relay T ₁ , respectively.

By selectively operating the subscriber-compatible test relays T ₁ to T _o , _the circuits LCC ₁ to LCC o of the corresponding subscriber lines SL 1 to SL _o and subscriber circuits LC ₁ to _{LC o} are
Each is connected to a measuring device M and a test telephone TT. Here, the condition of the subscriber line (loop resistance, capacity, crosstalk, etc.) is tested using measuring device M.
Further, an outgoing call is made from the test telephone TT, for example, the maintenance telephone MT is called, and the operation of the subscriber circuits LC ₁ to LC _o, particularly the circuits LCC ₁ to LCC _o , is tested. Note that MT is a maintenance phone.

It is well known that in digital electronic exchanges, just before a two-wire line carrying an analog signal is input to the exchange, it is divided into the line side and the exchange side, and each is connected to a test device for testing. The invention can be implemented when replacing an existing exchange with an exchange having the above-described test method.

FIG. 2 is a diagram showing the configuration of an embodiment of the present invention. In the figure, EX ₁ is an existing exchange, and EX ₂ is a newly installed exchange to replace exchange EX ₁ . The new exchange EX ₂ is similar to that shown in FIG. 1, but the circuits LCC ₁ to LCC _o are omitted from the figure.
The subscriber telephones S ₁ to _{S o} are connected to the existing exchange EX ₁ via the main distribution frame MDF. For example, subscriber telephones S ₁ and S _o with telephone numbers 0001 and 9000 are accommodated in subscriber line accommodation terminals corresponding to telephone numbers 0001 and 9000 of exchange EX ₁ .

Also for the new exchange EX ₂ , jumper is performed from the terminal of the main distribution board MDF to which the subscriber line is connected to the corresponding subscriber line accommodation terminal of the exchange EX ₂ . i.e. for example the telephone number of the main distribution board MDF
A jumper is performed from the terminals to which subscriber lines 0001 and 9000 are connected to the subscriber line accommodation terminal of the new exchange EX ₂ corresponding to the telephone numbers. Of course, this jumper is performed for all subscribers.

The present invention provides a method for testing whether or not the corresponding terminals between the main distribution board MDF and the new exchange EX ₂ are correctly connected.

Once the above-mentioned jumper work between the main distribution board MDF and the new switch, that is, the jumper work between the corresponding terminals, is completed, a test is performed to see if the connection is correct. Prior to running the test, we temporarily installed a test outgoing trunk TOGT on the new exchange EX ₂ and a test incoming trunk TICT on the existing exchange EX ₁ , and connected them with a test trunk TJ to connect them from the new exchange EX ₂ . Existing exchange
A test relay path will be temporarily installed to enable outgoing connection to EX ₁ . In addition, the dial digit analysis function of the new exchange EX ₂ will be partially modified so that all incoming calls to the local subscriber will be relayed to the existing exchange EX ₁ via the test relay path. The connection between the existing exchange EX ₁ and the line, ie, the main distribution frame MDF, will be maintained.

After completing the above preparations, perform a connection test using the following steps and operations.

(i) In the new exchange EX ₂ , specify the line under test and operate the test relay of the subscriber circuit of this line under test. The line to be tested can be specified by dialing from a maintenance telephone or by inputting commands from a typewriter.

For example, if you specify the line with telephone number 0001 as the line under test, test relay T ₁ of subscriber circuit LC ₁ corresponding to this line will operate, and
The terminal corresponding to the MDF line is a jumper wire,
The contact point t ₁ ⁰ of the subscriber circuit LC ₁ is connected to the line l ₀ of the test line TL ₁ , the input terminal tl ₀ of the test device TE from the selection circuit SEL, and further connected to the measuring device M via the connector CON, and
The input end of the circuit LCC ₁ is the contact t ₁ ¹ , the line of the test line TL ₁
l ₁ , input terminal tl ₁ of test equipment TE from selection circuit SEL,
Furthermore, it is connected to the measurement test telephone TT via the connector CON. As can be easily understood from the above example, the line side (main distribution board MDF side) of the specified line under test is connected to the measuring instrument M via the input terminal tl ₀ of the test equipment TE, and to the exchange side (circuit LCC ₁ side) is drawn into the test phone TT.

(ii) Next, make a call from the test phone TT of the test equipment TE and call the phone number (0001) of the line under test.
Dial.

(iii) This dialing signal, in the above example,
_The call is received by the new exchange EX ₂ from line l ₁ of the above test line TL ₁ via the subscriber circuit LC ₁ . Take out the trunk for testing
A relay connection is made to the existing exchange EX ₁ via a test relay path consisting of TOGT, test trunk TJ, and test incoming trunk TICT.

(iv) The existing exchange EX ₁ terminates this call using exactly the same operation as when processing a normal incoming and forwarding call. As a result, the existing exchange EX ₁ receives the above call using the dialed number (telephone number 0001) transferred from the new exchange EX ₂ via the test relay path.

(v) As a result of the above, a ringing signal is sent to the incoming terminal of the existing exchange EX ₁ (0001 in this case) in the same way as for normal incoming calls, and this ringing signal is sent to the above line (the line of the subscriber with telephone number 0001). It goes through the terminals of the main distribution board MDF connected to the terminal (0001) of the new exchange EX ₂ , then through the contact t ₁ ⁰ of the test relay T ₁ , the line l ₀ of the test line TL ₁ , and then the test equipment.
The input end of TE reaches tl ₀ . Confirm that a ringing signal appears at this input terminal tl ₀ . In addition, in order to confirm the above-mentioned ringing signal, an ordinary telephone RT is used in place of the measuring device M, and the bell is made to ring in response to the ringing current.

By the above steps, the main distribution board MDF and the new exchanger can be installed.
It is possible to test whether the jumper with EX ₂ was performed correctly. i.e. the test equipment TE as above if connected correctly.
The ringing current returns to the input terminal tl ₀ of the terminal, but if it is not connected correctly, the ringing current will not be returned.
For example, in Figure 2, if the terminal of the line for telephone number 0001 on the main distribution board MDF is not connected to subscriber terminal 0001 of the new exchange EX ₂ , but is therefore connected to another terminal, the above test Since the ringing current is sent to the other incorrectly connected terminal, it is not possible to receive the ringing current at the test device TE.

During the execution of the above test, if there is an actual incoming call on the line under test, the incoming subscriber terminal of the existing exchange EX ₁ , the main distribution board MDF, the new The input terminal of the test equipment TE via the subscriber circuit of the line under test of the exchange EX ₂
Since the ringing signal is sent to tl ₀ , it is impossible to distinguish between a test call and an actual incoming call. To distinguish this, follow the procedure (vi) below instead of the procedure (v) above.

(vi) Instead of the measuring device M at the input end tl ₀ of the test device T,
For example, if you connect a normal push-button dial telephone RT and receive a ringing signal, if you go off-hook and answer the test call, the push-button dial telephone RT will be connected to the existing exchange EX ₁ and the new exchange EX ₂ . Since the test phone TT is connected via , and for an actual incoming call,
The telephone RT replacing the measuring device M above is an existing exchange.
Although it is connected to the caller via EX ₁ , it is not connected to the test phone TT, so the confirmation tone does not reach the test phone TT. This procedure makes it possible to distinguish between test calls and actual incoming calls.

Although one embodiment of the present invention has been described above, various modifications are possible within the technical scope thereof.

It is possible to automate the steps (i), (ii), (v) and (vi) above, and test all lines automatically and sequentially. For step (i), the new exchange uses program control to sequentially specify the lines under test and operate the test relays of the subscriber circuits of the lines.
This is automatically carried out by the central control unit (not shown) of EX ₂ , and for step (ii), the central control unit relays the test call to the existing exchange EX ₁ based on the information specifying the line under test, and This can be automated by controlling the program to transfer the telephone number of the line to the existing exchange EX ₁ based on the information about the line under test. Step(v)
Regarding (vi), automation is easy because it is sufficient to confirm the calling signal or confirm the calling signal and send and confirm the confirmation sound.

As explained above, according to the present invention, an existing exchange is divided into a two-wire line carrying analog signals into a line side and an exchange side immediately before the line is input to the exchange, and each line is connected to a test equipment. To efficiently test whether or not the connection between the line accommodation terminals of the new exchange and the terminals of each line of the main distribution board is correct or not when replacing with a digital exchange equipped with a test method of individually pulling in and testing. There is a possible effect.

[Brief explanation of drawings]

FIG. 1 is a connection configuration diagram of an example of a replacement exchange according to the present invention, and FIG. 2 is a diagram showing the configuration of an embodiment of the present invention. EX ₁ ...Existing exchange, EX ₂ ...New exchange to replace the existing exchange, MDF...Main distribution board, S ₁ ~
S _o ...Subscriber telephone, SL ₁ to SL _o ...Subscriber line,
MT...Maintenance telephone, LC ₁ to _{LC o} ...Subscriber circuit, TDNW...Digital communication network, SEL...
Selection circuit, TE...Test equipment, t ₁ ⁰ , t ₁ ¹ ;~; t _o ⁰ ,
t ₁ ¹ ...Test relay contact, TOGT...Output trunk for test, TICT...Input trunk for test, TJ
...Test relay line.

Claims (1)

[Claims] 1. A test method was established in which an existing switchboard is tested by dividing the two-wire line that selects an analog signal into the line side and the switchboard side, and running the lines into the test equipment separately, just before the line is input to the switchboard. When replacing with a new exchange, connect the line to the corresponding line accommodation terminal of the new exchange while maintaining the connection between the line and the existing exchange, and create a test relay path to relay calls from the new exchange to the existing exchange. After temporarily installing and temporarily changing the new exchange so that incoming calls within the new exchange are relayed to the existing exchange via the test relay path, specify the line under test in the new exchange and connect the line to the line and the exchange. The switch is connected to the line corresponding to the line under test on the existing switch via the new switch and the test relay path, and a ringing signal is sent to the line. , on the other hand, a test method characterized in that, in a testing device for a new exchange, a calling signal from the line side of the line under test is checked to detect whether the line under test is correctly connected to the new exchange.