JP2624012B2 - Digital switching equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital switching apparatus for switching from a wired communication system to a wireless communication system having a different transmission speed or from a wireless communication system to a wired communication system.

[0002]

2. Description of the Related Art FIG. 5 is a system configuration diagram showing a relay system of a conventional digital exchange, in which 1 is a wired terminal, 2 is a wired trunk having a wired terminal I / F, 3 is an exchange switch, 6a, 6b is a wireless terminal, 9a and 9b are wireless trunks having wireless terminal I / Fs, 10a and 10b are data converters built in wireless trunks 9a and 9b, respectively, for performing data conversion between a wired communication system and a wireless communication system. A digital exchange is constituted by the wired trunk 2, the exchange switch 3, and the wireless trunks 9a and 9b.

Next, the operation will be described. In the figure, the wireless system audio data from the radio terminal 6a is data converted to 64k PCM audio data by the data converter 10a of the wireless trunk 9a. 64k with data conversion
The PCM voice data is sent from the wired trunk 2 to the wired terminal 1 via the exchange switch 3. On the other hand, the wired terminal 1
Is transmitted from the wired trunk 2 via the exchange switch 3 to the wireless trunk 9a. The voice data sent to the wireless trunk 9a is converted into wireless voice data by the data converter 10a and transmitted to the wireless terminal 6a.

FIG. 6 is a relay diagram showing a case of a call between wireless terminals. Wireless voice data transmitted from a wireless terminal 6a is sent to a wireless trunk 9a and transmitted to a data converter 10a.
Is converted to 64k PCM audio data. This data is sent to the wireless trunk 9b by the exchange switch 3, and is again converted by the data converter 10b.
The data is sent to the wireless terminal 6b as wireless audio data.

[0005]

In a conventional digital exchange, a data converter is provided for a line, so that if one of the data converters fails, the line corresponding to that device cannot be used. There was a problem that it disappeared. Further, in the communication between the wireless terminals, it is necessary to perform the data conversion twice, and there is a problem that the reliability is reduced and the transmission delay is increased due to the increase in the H / W amount. SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and aims to make all lines effective even if one of the data conversion devices fails, and furthermore, to make communication between wireless terminals possible. The purpose is to improve reliability in the case and reduce the amount of transmission delay.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a digital switching device for switching from a wired communication system to a wireless communication system having a different transmission speed or from a wireless communication system to a wired communication system. A plurality of data conversion trunks that perform data conversion between a wired communication system and a wireless communication system, and exchanges both communication systems via one of the data conversion trunks in communication between the wired communication system and the wireless communication system. And an exchange switch for exchanging the two communication systems without passing through the data exchange trunk in the communication between the wireless communication systems.

[0007]

According to the present invention, in the communication between the wired communication system and the wireless communication system, both communication systems are exchanged via one of the common data conversion trunks, and in the communication between the wireless communication systems, the data conversion is performed. Replace without going through the trunk.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. Figure 1
FIG. 3 is a system configuration diagram showing a relay system of a digital exchange according to the present invention. In FIG. 3, 1 is a wired terminal, 2 is a wired trunk having a wired terminal I / F, 3 is an exchange switch, 4a and 4b are shown. Data conversion trunks 5a and 5b common to each line including a data conversion device
/ F is a wireless terminal, and 6a and 6b are wireless terminals, and a digital exchange is constituted by the wired trunk 2, the exchange switch 3, the data conversion trunks 4a and 4b, and the wireless trunks 5a and 5b.

Hereinafter, the operation of the present invention will be described. FIG. 1 shows a case of a call between the wired terminal 1 and the wireless terminal 6a. The wireless audio data transmitted from the wireless terminal 6a enters the wireless trunk 5a and is simulated as 64 kbps audio data (64k bearer data). Converted and exchange switch 3
Is sent to the data conversion trunk 4a. In the data conversion trunk 4a, the data is converted into 64 Kbps audio data by data conversion ( encryption , PCM encoding, etc.), and then transmitted from the wired trunk 2 to the wired terminal 1 via the exchange switch 3. On the other hand, 64k PCM transmitted from the wired terminal 1
The voice data is transmitted through the data conversion trunk 4a through the reverse route.
The data is converted into wireless audio data by the wireless communication device 5 and transmitted from the wireless trunk 5a to the wireless terminal 6a.

FIG. 2 shows a case of mutual communication between the wireless terminals 6a and 6b. The wireless voice data from the wireless terminal 6a is transmitted through the wireless trunk 5a, the exchange switch 3, and the wireless trunk 6a. And does not pass through the data conversion trunks 4a and 4b.

FIG. 3 shows a case where the data conversion trunk 4a breaks down during a call between the wired terminal 1 and the wireless terminal 6a. Since the data conversion trunks 4a and 4b are common trunks that can be shared by each line, the data conversion When the conversion trunk 4a cannot be used, a communication path is formed by the exchange switch 3 so as to pass through the data conversion trunk 4b.

In the above embodiment, a case has been described in which the data converter is configured as a common data conversion trunk.
An echo canceling function for eliminating the wraparound generated on the wired trunk side may be provided in the common data conversion trunk. FIG. 4 is a block diagram of the data conversion trunk in this case. Reference numeral 7 denotes an echo canceller, and reference numeral 8 denotes a data conversion device. The echo canceller 7 removes the wraparound A generated on the wired trunk side.

[0013]

As described above, according to the present invention, since the data converters are separated from each other as a common trunk, even if one of the data converters breaks down, all of the data converters pass through the other data conversion trunks. Line available. In the communication between wireless terminals, a data conversion transformer is used.
Exchange without going through the
Since data conversion between the wired communication system and the wireless communication system by the conversion trunk is not involved, simplification of H / W, reduction of transmission delay time, improvement of reliability, and the like can be expected.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram showing an example of a relay system of a digital exchange according to the present invention.

FIG. 2 is a system configuration diagram showing another example of the relay system of the digital exchange according to the present invention.

FIG. 3 is a system configuration diagram showing another example of the relay system of the digital exchange according to the present invention.

FIG. 4 is a block diagram of a data conversion trunk showing another embodiment of the digital exchange according to the present invention.

FIG. 5 is a diagram showing an example of a relay system of a conventional digital exchange.

FIG. 6 is a diagram showing an example of a relay system of a conventional digital exchange.

[Explanation of symbols]

 Reference Signs List 1 wired terminal 2 wired trunk 3 exchange switch 4a data conversion trunk 4b data conversion trunk 5a wireless trunk 5b wireless trunk 6a wireless terminal 6b wireless terminal

Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location H04Q 11/04 301

Claims (1)

(57) [Claims] 1. A digital exchange device for performing switching from a wired communication system to a wireless communication system having a different transmission speed or switching from a wireless communication system to a wired communication system. In a plurality of data conversion trunks for performing data conversion between systems, and in communication between a wired communication system and a wireless communication system, both communication systems are exchanged via one of the data conversion trunks, and mutual communication between the wireless communication systems is performed. A digital switching device, comprising: an exchange switch for exchanging both communication systems without passing through the data exchange trunk in communication.