JPH03277051A - Line loopback connection test method for telephone line network - Google Patents

Abstract

PURPOSE:To execute the test uniquely for a local station by adding a special code before a dial number. CONSTITUTION:A general dial is expressed as 'DE ', that is, the telephone number is 'DE' and a subscriber number is ' ', and a number '9' is added as a special code number and '9DE ' is used in total. When a local station 2 receives a number '9' as a head dial digit, the station 2 discriminates the call to be a loopback connection test call and sends number of '9DE ' to a toll station 3 to allow the toll station 3 to make loopback connection. Upon the receipt of the number '9DE ', the toll station 3 selects the local station 2 by using the digits 'DE' and sends the number ' ' to send the test call to a subscriber 4 via the local station 2.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for connecting a test call on a telephone line.

[Conventional technology]

Conventionally, the connection for a return test has been such that an operator at the toll office or equipment uses an MDF or the like to perform a return connection, thereby confirming the normality of the transferred test call.

(Problems to be Solved by the Invention) The conventional return test connection method described above requires an operator or equipment to be prepared at the toll office side, and the local telephone exchange equipment (hereinafter referred to as the local office) side However, if the station has not yet opened, the disadvantage is that the local station and the long-distance station must agree on work procedures and contents in advance.

An object of the present invention is to provide a line return connection testing method for a telephone line network, which automatically returns and connects a test call without preparing an operator or a callback device at the other party's toll office.

[Means to solve the problem]

The circuit loopback connection testing method for a telephone line network according to the present invention is characterized in that the local telephone exchange equipment to be tested receives a predetermined specific code that is not used as the first digit of the closing number before the closing number. Then, the specific code or the assigned closing number is transferred to the affiliated toll station, and the toll station selects and connects using the received closing number to connect back and connect the local telephone exchange. The system allows calls to be received by subscribers with closed numbers.

[Effect]

When a test subscriber terminal attaches a predetermined specific code as the first digit and dials the lockout number of another subscriber terminal installed at the same location as the subscriber terminal, the local station The closure number with the specific code is transferred to the toll office, and the toll office uses the specific code to determine that the call is a connection test call and connects selectively using the closure number. The loop back connection is performed without any separate operation or setup of devices for the loop back connection.

[Example] Next, an example of the present invention will be described with reference to the drawings.

1 to 3 are relay connection diagrams of a telephone line network in which an embodiment of the telephone line return connection testing method of the present invention is applied.

This method of testing telephone loop connection is to send a call from any subscriber 1 for testing, return it at the local toll office 3 to which it belongs, and send it back to subscriber 4 located at the same location as subscriber 1. This is a test of the connection status by receiving calls, and is a connection test between a local office and a toll office that is carried out for a specific period when new or expanded local telephone exchange equipment is installed. In this case, the number to be used is a closing number with a predetermined specific code number added to the beginning of the local area code. Therefore, the local station 2 is set so that calls to which the specific code number is assigned are transferred to the toll station 3 to which it belongs during this specific period.

Next, the operation of this embodiment will be explained.

FIG. 1 shows a case of a central line connection configuration in which a local office is directly connected to its own toll office, and subscriber 1 calls subscriber 2. For general dialing, use rDE△△△△J, that is, the station number rDEJ, and the subscriber number ``△△△Δ'', or add ``9'' as a special code number and use r9DE△△△△. However, it is assumed that "9" is not used in the D code within the closed number area of this area station 3. When the local station 2 receives "9" as the first dial digit, it determines that it is a return connection test call and sends r9DE△ to the toll station 3.
△△Δ'' digits are sent out, and connection is made back at toll station 3.

When the toll station 3 receives r9DEΔ△△△, it selects the local station 2 with the digit rDEJ, sends ``△△△△'', and sends the test call to the subscriber 4 via the local station 2. Make a call.

2 and 3 are diagrams showing relay connections when a local relay station 5 is interposed between a local station 2 and a toll station 3, respectively. Figure 2 shows the case where incoming calls go through local relay station 5, and Figure 3 shows the case where both incoming and outgoing calls go through local relay station 5, but the connection method is the same as in Figure 1. .

Also, in Tokyo, the closed number or rBCD (E)△△△△”
and r13 as a special code before rBCD (E)J.
If you want to use numbers that are not used for the J code, it is impossible because all the numbers are used, so in the case of the MF dial, it is only possible to use rHJ or "#".

In another embodiment of the present invention, the toll office determines that the call is a test call by adding one digit to the existing area code, and then connects the call back.

〔Effect of the invention〕

As explained above, by adding a special code to the front of the closing number, the present invention eliminates the need for preparation of the operator or equipment of the toll station, and also enables detailed communication with the toll station before the opening of the local station. Since no coordination is required, city stations can conduct their own tests.

[Brief explanation of the drawing]

FIGS. 1 to 3 are relay connection diagrams of a telephone line network to which an embodiment of the telephone line return connection testing method of the present invention is applied. 1.4...Subscriber, 3--Total station, 2--Local station, 5--Local relay station.

Claims (1)

[Scope of Claims] 1. A test method for loopback connection of a telephone line network between a local office and a long-distance office during the installation or expansion of local telephone exchange equipment and the accompanying addition of subscribers, the subject of the test being: When a local telephone exchange receives a predetermined specific code that is not used as the first digit of the closure number before the closure number, the local telephone switching equipment of The call is forwarded to an external office, and the toll office selectively connects based on the received closed number to make a return connection and terminate the call to the subscriber of the closed number via the local telephone exchange. Folded connection test method.