DE4017962A1 - Connecting digital communication network to analogue network - starting time generator on each digit from subscriber to starting exchange of digital network - Google Patents

Abstract

The connection between a digital telecommunications network with a central code system and an analogue telecommunications network with a signalling system is carried out without selection end and start sign. Each subscriber transmits a digit to the original exchange of the digital network to start a time generator. On the time generator run, the characteristic signal of the code system is transmitted to a destination exchange, forming the transition to the analogue network. On the characteristic reception in the destination exchange, a selection end sign in the code system is transmitted to the original exchange, followed by a start sign of the destination exchange. USE/ADVANTAGE - Telecommunications control systems. Establishment of connection between two networks not affected even if the analogue network offers special service using analogue signalling without dial codes.

Description

The invention relates to a method of manufacture a connection between a digital telecommunications network with central signaling system and an analog Telecommunications network with a signaling procedure without End of election and start characters.

In a telecommunications network, for the purpose of a Message exchange participants over several Line sections and switching equipment connected with each other.

To control the connection are established and removed appropriate types of signaling are specified.

In analog telephone networks one is usually used Speech circuit-bound signaling used.

In contrast, the signaling for digital networks its own, common to all speech groups Signaling channel handled. Such a central The signaling system is that of the CCITT (Comit  Counsultatif International Tlgraphique et Tlphonique) published signaling system No. 7 ("The CCITT Signaling System No. 7", lesson sheets the German Bundespost, 37 vol., February 10, 1984, issue 2, pages 27 to 70).

If now a connection via a digital Telecommunications network to a subscriber of an analog Telecommunication network is to be established, a Signaling adjustment done. It is the analog network is a special network that is an analog Signaling procedure without end of election and The beginning character is used, so the task arises Cooperation procedure of the central Signaling system with the analog Signaling procedure to indicate that a Connection establishment is not affected.

According to the invention, this object is achieved by the technical Teaching of claim 1 solved.

Advantageous embodiments of the invention are the See subclaims.

The teaching according to the invention is described below of an embodiment explained in more detail.

It is assumed that an A-participant, the one Connection to a via a digital telecommunications network B subscriber in one with the digital telecommunications network wants to build connectable analog telecommunications network. In the digital telecommunications network becomes a central one Signaling system according to CCITT No. 7 used and that  analog telecommunications network works with one Signaling procedure without end of election and Start sign.

The A-participant is elected with a Source switch of the digital network connected. With each given by the A-participant Digit becomes a timer in the Origin exchange started again. According to the digits entered, a central signaling channel signaled and a connection to a destination switching center built in the digital network, the Target exchange the transition to the analog network forms.

After the last digit by the A-participant entered, will be here after the timer expires after T = 12 sec, one with an identifier Message from the originating exchange to Target exchange via the signaling channel Posted. As a message, one is in the signaling channel No. 7 defined as follow-up addressing message SAM Message used, in which also in the Signaling system No. 7 defined identifier ST (ST = end the electoral information symbol) is inserted.

By taking advantage of the signaling system already in place No. 7 predetermined identifier, is advantageous no change or partial redefinition of the central Signaling system necessary.  

The one containing the identifier ST Follow-up addressing message SAM is received in the destination exchange interpreted as if from the analog network into which the destination switching center has dialed the dialed digit, one end of the election and one Would have been sent.

Thus, the destination exchange initiates through the received identifier ST, one in the central Signaling system No. 7 pre-determined end of sign followed by a start sign above the central one Character channel transmitted to the originating exchange.

The originating exchange then switches on a key dialer the corresponding Touch-key receiver from or suppressed at one ISDN subscribers may later (after the Digits).

Since the ending sign is followed by the starting sign, in the originating exchange another, the Timers monitoring the start signal switched off. It this prevents this additional timer from Time would trigger the connection.

According to a further embodiment of the invention in the event that additional features such as Call forwarding in the analog network can be activated as a message from the signaling system Initial addressing message IAM used in the End-of-dial information character ST as identifier is inserted. As a result, the Call forwarding Intermediate exchange of the digital network, the  forms the transition to the analog network, analogously as before described, after receiving the identifier ST End of election sign followed by the start sign for Transfer of origin.

The teaching according to the invention is also self-evident in the event that the A-subscriber is in the analog network and is connected to a B-subscriber in the digital network wants to apply accordingly.

Especially if such an A participant has a submits an incomplete choice will be made by the corresponding Transition exchange from on to the A subscriber Busy sign sent.

Claims (4)

1. A method for establishing a connection between a digital telecommunications network with a central signaling system and an analog telecommunications network with a signaling method without dialing end and start characters, consisting of the following steps

• a timer is started with each digit given by a subscriber to an originating exchange of the digital network,
• - When the timer expires, a message from the signaling system provided with an identifier is transmitted to a destination switching center which forms the transition to the analog network
• - With the receipt of the identifier in the destination exchange, a dialing end character specified in the signaling system, followed by a start character, is transmitted from the destination exchange to the originating exchange.

2. The method according to claim 1, in which as the message of Signaling system a follow-up addressing message is used in the one End-of-dialing information character inserted as identifier is.   3. The method according to claim 1 or 2, in which in the Origin exchange with receipt of the Another sign to monitor the Existing timer to prevent it a triggering of the established connection is switched off becomes. 4. The method according to claim 1, in which as the message of Signaling system an initial addressing message is used in the one End-of-dialing information character inserted as identifier is, so that in the case of call forwarding to analog network in a call forwarding initiating transition agency of the digital Network after receiving the identifier an end-of-dial character followed by a start sign for Origins exchange is transferred.