SU302844A1 - METHOD FOR MONITORING THE CORRECTNESS OF ESTABLISHING A TRANSIT CONNECTION - Google Patents

Description

The invention relates to the field of data transmission, in particular, to methods of controlling the correctness of connection establishment on automatically switched networks (telegraph or other discrete information transmission networks) with code switching.

When implementing the known method of checking the correctness of the establishment of a transit connection from the transmitting device of the calling point (manually by the operator) or from the switching center to which the called point is connected, an automatic request is sent immediately after the connection is established and then the caller's operator analyzes the auto answer received for this request. Waiting and analyzing an auto answer by the operator leads to unproductive channel occupancy.

A feature of the proposed method is that in order to automate the monitoring of the correctness of the connection, each code message transmitted on automatically switched code-switched networks, after the address preheader controlling the connection establishment, directly enters the text of the message, which contains In its composition, a conditional clause characterizing only the item being called. This request is received and analyzed at the equipment of the point to which it is connected.

If the received code request does not match the conditional pinch assigned to this item (incorrectly established connection), then the terminal equipment at this item is automatically destroyed, which causes the sending device to turn off at the calling point.

If the received code request matches the conditional chirping of this clause (a correctly established connection), then the message transmission starts from the sender's sending device immediately after the code request is sent.

Thus, the control of the correctness of the establishment of the transit connection is carried out automatically (without the operator) on the point to which the connection is established, and not on the calling point.

Pa drawing shows a diagram of a network for transmitting discrete information with automatic code-switched channels (one of the options).

To the automatic code switching center 1 are connected via subscriber lines endpoints 2, 3, 4 networks, and to the automatic code switching center 5 are connected via subscriber lines endpoints

points 6, 7, 8 networks. The switching centers / and 5 are connected to each other by a connecting line.

At each end point of the network (the drawing is shown only in paragraphs 5 and 7), the subscriber terminal 9, the JO transmitter and the receiver // are installed.

A discrete message that must be transmitted, for example, from end point 3 to end point 7 after the code address overhead controlling the automatic code switching process at the switching centers / and 5, is entered with a code request that includes the conditional end point 7 cipher. The transmitter 10 in step 3 reads the address pre-header, which leads to automatic connection establishment. Then the transmitter 10 reads the code request (the conditional code of paragraph 7).

The code request (conditional code of clause 7) transmitted from clause 3 is received by the receiving device // clause 7 and then submitted for analysis to the end user device 9 of the same clause. The analysis consists in comparing the received pinch with the conditional code of this item, which is laid down in the scheme of the terminal subscriber unit.

If the connection is established correctly, i.e., the received conditional cipher coincides with the cipher01M incorporated in the subscriber terminal scheme of clause 7, then no switching occurs. The transmitter of 10 point 3 in this case continues

after reading the code request, read the text of the discrete message.

If the received conditional cipher does not coincide with the conditional code of clause 7, the subscriber terminal device of this clause automatically destroys the established connection, which causes the transmitter of clause 3 of clause 3 to be turned off.

The control program of the automatic transmission device of the terminal point may consider repeating the attempts to establish the connection during its forced destruction if the connection is incorrect and the alarm is issued to personnel carrying a certain number of unsuccessful calls.

Subject invention

The method of controlling the correctness of the establishment of a transit connection in the transmission of discrete information, where code switching is used, characterized in that, in order to automate the control, the code request includes a conditional code of the called point, which is automatically analyzed at the receiving point, and in the event of a coincidence the received cipher with the cipher of the receiving point, reads the text of the discrete message by the transmitting device of the calling point, and if the numbers do not match, they destroy the established connection Ineny and off the transmitter of the calling point.