JPH04196895A - Connection control method for mfc signal - Google Patents

Abstract

PURPOSE:To transmit a different MFC signal while applying code conversion to an MFC signal received in a barrier station by converting an MFC code received by an exchange to an internal code from an external code, and converting the MFC code transmitted by an external code conversion table to the external code from the internal code. CONSTITUTION:By internal code conversion tables 3 and 5, an MFC code received by an exchange is converted to an internal code from an external code, and by the internal code, a group signal defined by the exchange is inputted to an internal call processor 2, and from the internal call processor 2, the group signal defined to the exchange is outputted. Subsequently, an MFC code transmitted by external code conversion tables 4 and 6 is converted to the external code from the internal code, and it is constituted so as to define the group signal defined by the exchange by the external code and the transmitted MFC code. In such a way, a connection processing by the MFC signal to various telephone exchange networks can freely and simply be executed for each ground.

Description

[Detailed Description of the Invention] [Summary] Regarding a control method for interconnecting telephone switching networks in which different MFC group signals are defined, MF received at a gateway station in contact with different switching networks is disclosed.
The purpose of this system is to code-convert C signals and transmit different MFC signals.At a gateway station that connects multiple telephone exchange networks that define different MFC group signals, the received MFC group signal is converted to a code signal for each region. It has an internal code conversion table for converting the transmitted MFC group signal into a signal compatible with the opposing telephone exchange network, and an external code conversion table for converting the transmitted MFC group signal into a signal compatible with the opposing telephone exchange network.
By converting the FC code from external code to internal code and converting the MFC code to be transmitted from internal code to external code using the above external code conversion table, you can freely change the group signal defined by the exchange and the MFC code to be transmitted. Configure to convert.

[Industrial application field]

The present invention relates to a control method for interconnecting telephone switching networks that define different MFC group signals.

Although the CCITT recommendation defines MFC group signals, MFC group signals may be defined individually depending on the telephone switching network. MFC with various telephone switching networks under such different MFC signal conditions.
A signal connection is required. Generally, an MFC signal is defined as signals of 15 types of frequencies, which are a combination of two types of signals in a high frequency band and a low frequency band.

Between telephone exchanges, the originating exchange sends an activation signal to the terminating exchange, receives a confirmation signal from the terminating exchange, and then receives a control signal from the terminating exchange for each telephone number of the called party. Call the called party's phone number. Upon request from the terminating exchange, the identification information of the terminating subscriber class can be transmitted from the originating station in an MFC signal. Even when the call is relayed through several telephone exchanges, the identification information of the called subscriber class can be relayed to the destination station. At this time, the MFC group signal relayed through the gateway exchange will be transmitted and received as different MFC signals depending on the ground exchange. It is required to perform connection conversion of MFC signals at this gateway station to connect to exchange networks that define various MFC signals.

[Conventional technology]

Conventional MFC signal control is based on the MFC defined by the exchange.
There is a one-to-one correspondence between the group signal and the received MFC code. FIG. 5 shows a block diagram of a conventional signal control system at a gateway station.

In the figure, 21 is a network, 22 is an internal call processing device, 23.25 is a group signal definition table on the exchange side, 24.26 is an MFC code definition table on the sending side, 2
7 indicates an MFC input terminal, and 28 indicates an MFC output terminal.

MFC input terminal 27 receives MFC reception code i from ground A.
is input, the group signal i is set as fixed by the group signal definition table 23, and the internal call processing device 22 converts the group signal from i to k.
The group signal k converted by the FC code definition table 24 is set to the fixed transmitting side MFC code k, and the MFC code k is transmitted to the ground B from the MFC output terminal 28. Conversely, MFC reply code j from ground B
It is received by the output terminal 28, set to a group signal j fixed by the group signal definition table 25, converted from j to 1 in the internal call processing device 22, and then converted by the MFC code definition table 26 on the transmitting side. Set the group signal 1 to the fixed transmitting side MFC code l, and input the MFC code l from the MFC input terminal 27 to the ground A.
Reply to.

The group signal definition tables 23 and 25 on the exchange side set the MFC code signal on the receiving side to a fixed group signal, and the MFC code definition tables 24 and 26 on the transmitting side set the MFC code signal on the receiving side to a fixed group signal.
sets the group signal to a fixed MFC code signal. The group signal set in the group signal definition table 23.25 on the exchange side is converted in the internal call processing device 22, and an MFC code is set in the MFC definition table 24.26 on the transmitting side. Therefore, all group signal conversion is performed by internal call processing device 22.

[Problem that the invention aims to solve]

Therefore, since the group signal defined by the exchange and the received MFC code correspond on a one-to-one basis, connecting to a telephone exchange with a different MFC group signal definition requires conversion in the internal call processing device and internal call processing. The call processing device has become complicated and there has been a problem in that it is not easy to change group signals.

The present invention converts an MFC code received by a switch from an external code to an internal code outside an internal call processing device, and converts an MFC code to be transmitted from an internal code to an external code outside the internal call processing device. This simplifies the internal call processing equipment and allows the received MFC code and the transmitted MFC code to be
The purpose is to freely convert MFC signals from FC codes within the range of group signals allowed by internal call processing equipment for each destination.

[Means to solve the problem]

FIG. 1 shows the principle configuration diagram of the present invention. In the figure, l is the network, 2 is an internal call processing device, 3 and 5 are internal code conversion tables that convert received MFC code signals into code signals for each destination, and 4 and 6 are telephones for transmitting MFC group signals. An external code conversion table for converting code signals compatible with the switching network; 7 is an MFC input terminal;
8 indicates an MFC output terminal.

The MFC code received by the exchange is converted from an external code to an internal code using the internal code conversion tables 3 and 5, and the group signal defined by the exchange using the internal code is input to the internal call processing device 2, and the internal call Processing device 2
An MFC that outputs the group signal defined to the exchange and transmits it using the external code conversion tables 4 and 6 above.
The code is converted from an internal code to an external code, and the external code defines the group signal defined by the exchange and the MFC code to be transmitted.

[Effect]

A diagram explaining the principle of the conversion table of the present invention is shown in FIG. FIG. 2(a) shows an example of code conversion using an internal code conversion table, and FIG. 2(b) shows an example of code conversion using an external code conversion table.

In Figure (a), (2) is a fixed group signal definition table on the exchange side, and (1) is an internal code conversion table. A code i received from the outside is converted into an internal code j using the index of the internal code conversion table (1). A group signal j on the exchange side is defined from the internal code signal j converted by the definition table (2).

This defined group signal j is input to the internal call processing device.

In Figure (b), (4) is a fixed definition table for the transmission MFC code signal, and (3) is an external code conversion table. The internal transmission group signal k is converted into the external group signal l using the index of the external code conversion table (3). A transmission code l is defined from the group signal l converted using the definition table (4).

By processing the internal code conversion table and external code conversion table, the transmission MFC is transmitted from the group signal on the exchange side without performing code conversion processing within the internal call processing device.
A code signal can be sent, and the code signal can also be sent from i to j.
, it becomes possible to convert k to 1 into a confession.

〔Example〕

FIG. 3 shows a block diagram of connection control of MFC signals at the gateway station according to the present invention. In the figure, 11 is a network, 12 is an internal call processing device, 13.14 is a reception code conversion processing unit, 15.16 is a transmission code conversion processing unit, and 17
．． 18 indicates an MFC input terminal, and 19.20 indicates an MFC output terminal.

MFC input terminal 17 shows input from ground A, MFC input terminal 18 shows input from ground B, MFC output terminal 19 shows output to ground A, and MFC output terminal 20 shows output to ground B. The input terminals each receive transmission group signals I, It with a reception code, and transmit return group signals A, B with a transmission code. The output terminals each transmit a sending group signal with sending codes I and II, and receive return group signals with receiving codes A and B, respectively.

Processing devices ① and ② of the reception code conversion processing units 13 and 14.

■, ■ convert the received external code into an internal code, respectively, and the processing units ■,
For (1), (2), and (2), each internal code is converted into an external code and transmitted, and the internal call processing device 12 performs network exchange processing using the converted internal code. Therefore, there is no need for code conversion in the internal call processing device 12 as in the prior art, thereby simplifying network switching processing.

An example of conversion of received codes is shown in FIG. Figure 4 (a
) shows an example in which received codes are converted for each destination, and FIG. 4(b) shows an example in which different codes are converted into the same code. The figure shows the MF received from the MFC input terminal 17 in Figure 3 above.
The internal code conversion table of the processing devices ① and ② of the received code conversion processing unit 13 that converts the C code is shown. In addition, 0.
0 indicates the added ground table, ■, C indicates the code conversion table, and 0.0 indicates the group signal definition table.

Fig. 4(a) shows that code signal i is converted to code signal j for conversion to ground A, converted to code signal k for conversion to ground B, and the croup signal j for ground A and the croup signal j for ground B are converted by code signals j and k. Define a group signal k for B. Therefore, even with the same code signal i, different group signals can be defined depending on the destination.

In FIG. 4(b), a code signal i for ground A and a code signal j for ground B are converted into the same code signal k, and a croup signal k for the same ground C is defined by the code signal k. Therefore, the same group signal k can be defined even with different code signals i and j.

〔Effect of the invention〕

According to the present invention, by using a table that converts MFC signals used between stations into signals for internal processing of the exchange at a gateway station that is in contact with different telephone exchange networks, MFC signals between various telephone exchange networks can be exchanged. Connection processing can be performed freely and easily for each region.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the principle of the present invention, Fig. 2 is a diagram explaining the principle of the conversion table of the present invention, Fig. 3 is a block diagram of the embodiment, Fig. 4 is an embodiment of reception code conversion, and Fig. The figure shows a block diagram of a conventional example. In the figure, l, 11.21 is the network, 2゜1
2, 22 are internal call processing devices, 3, 5 are internal code conversion tables, 4.6 are external code conversion tables, 7, 1? ,
18.27 is MFC input terminal, 8.19.20°28
13.14 is a reception code conversion processing section, 15.16 is a transmission code conversion processing section, 23.25 is a group signal definition table, and 24.26 is an MFC code definition table. Fig. 1 (a) Example of code conversion of internal code conversion table (b) Example of code conversion of external code conversion table Diagram explaining the principle of the conversion table of the present invention Fig. 2 1B '--=----=---- ---1□ 20
Figure 3: Block configuration diagram of the embodiment

Claims (1)

[Claims] Internal code conversion tables (3) and (5) for converting received MFC code signals into code signals for each region at a gateway station connecting multiple telephone switching networks defining different MFC group signals. and external code conversion tables (4) and (6) for converting the transmitted MFC code signal into a signal compatible with the opposing telephone switching network.
Converts the MFC code received by the exchange from an external code to an internal code using the internal code conversion tables (3) and (5), and converts the MFC code to be transmitted from the internal code to an external code using the external code conversion table. The MFC is characterized by freely converting the group signal defined by the exchange and the MFC code to be transmitted.
FC signal connection control method.