JPH04320197A - Digital exchange - Google Patents

Abstract

PURPOSE:To improve the reliability and to reduce a transmission delay when part of the exchange is faulty or in the case of intercommunication of radio terminal equipments. CONSTITUTION:In the case of communication between a wired communication system and a radio communication system whose transmission speed differs from that of the wired radio communication system, both the communication systems are exchanged by using an exchange switch 3 via one of data conversion trunks 4a, 4b used in common. In the case of the communication between radio communication systems whose transmission speed is the same, both the communication systems are exchanged by using the exchange switch 3 not through the data conversion trunks 4a, 4b.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital switching device for switching from a wired communication system to a wireless communication system with 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 the figure, 1 is a wired terminal, 2 is a wired trunk equipped with a wired terminal I/F, 3 is an exchange switch, 6a, 6b is a wireless terminal, 9a and 9b are wireless trunks equipped with a wireless terminal I/F, and 10a and 10b are data conversion devices built into the wireless trunks 9a and 9b, respectively, for converting data between the wired communication system and the wireless communication system. A digital exchange is configured by a wired trunk 2, an exchange switch 3, and wireless trunks 9a and 9b.

Next, the operation will be explained. In the figure, 8 kbps voice data from a wireless terminal 6a is converted to 64 kbps by a data converter 10a of a wireless trunk 9a.
The data is converted into CM audio data. The converted 64kPCM audio data is sent from the wired trunk 2 to the wired terminal 1 via the exchange switch 3. On the other hand, 64K voice data from the wired terminal 1 is sent from the wired trunk 2 to the wireless trunk 9a via the exchange switch 3. The audio data sent to the wireless trunk 9a is converted into 8 kbps audio data by the data conversion device 10a and sent to the wireless terminal 6a.

FIG. 6 is a relay diagram showing the case of a call between wireless terminals. 8 kbps voice data transmitted from the wireless terminal 6a is sent to the wireless trunk 9a, and the data conversion device 1
Data is converted to 64k PCM audio data at 0a. This data is sent to the wireless trunk 9b by the exchange switch 3, converted into data again by the data conversion device 10b, and sent to the wireless terminal 6b as 8 kbps voice data.

[0005]

[Problem to be Solved by the Invention] Conventional digital switching equipment is equipped with a data conversion device for each line, so if one of the data conversion devices breaks down, the line corresponding to that device cannot be used. There was a problem with it disappearing. Furthermore, when communicating between wireless terminals, it is necessary to perform data conversion twice, and there are also problems such as a decrease in reliability and an increase in the amount of transmission delay due to an increase in the amount of H/W. The present invention was made in order to solve the above-mentioned problems, and aims to enable all lines to be valid even if one of the data conversion devices breaks down, and furthermore, it aims to enable communication between wireless terminals. The purpose is to improve reliability and reduce transmission delay.

[0006]

[Means for Solving the Problems] The present invention provides common equipment for digital switching equipment that performs switching from a wired communication system to a wireless communication system with a different transmission speed, or from a wireless communication system to a wired communication system. a plurality of data conversion trunks that convert data between the wired communication system and the wireless communication system; and an exchange switch that performs exchange between the two communication systems without going through the data exchange trunk in communication between the wireless communication systems.

[0007]

[Operation] In the present invention, in communication between a wired communication system and a wireless communication system, both communication systems are exchanged via one of the common data conversion trunks, and in communication between the wireless communication systems, data conversion is performed. Exchange without going through the trunk.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below with reference to the drawings. Figure 1~
FIG. 3 is a system configuration diagram showing a relay system of a digital exchange according to the present invention. In the figure, 1 is a wired terminal, 2 is a wired trunk equipped with a wired terminal I/F, 3 is an exchange switch, and 4a and 4b are not shown. 5a and 5b are wireless terminals I
The wireless trunks 6a and 6b equipped with /F are wireless terminals, and the wired trunk 2, the exchange switch 3, the data conversion trunks 4a and 4b, and the wireless trunks 5a and 5b constitute a digital exchange.

The operation of the present invention will be explained below. FIG. 1 shows a case of a call between a wired terminal 1 and a wireless terminal 6a, in which 8 kbps voice data sent from the wireless terminal 6a enters the wireless trunk 5a and is pseudo-converted into 64 kbps voice data (64k bearer data). The exchange switch 3 sends the data to the data conversion trunk 4a. In the data conversion trunk 4a, data conversion (secret story, PCM
After the audio data is converted into 64 Kbps audio data by encoding, etc.), it is sent from the wired trunk 2 to the wired terminal 1 via the exchange switch 3. On the other hand, 6 transmitted from wired terminal 1
The 4k PCM audio data is converted into 8kbps audio data by the data conversion trunk 4a through the reverse route, and sent 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, and 8 kbps voice data from the wireless terminal 6a is sent to the wireless terminal 6b via the route of the wireless trunk 5a, exchange switch 3, and wireless trunk 6a. The data is sent without passing through the data conversion trunks 4a and 4b.

FIG. 3 shows a case where the data conversion trunk 4a fails 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 trunk 4a and 4b are common trunks that can be shared by each line. When the conversion trunk 4a cannot be used, the exchange switch 3 configures the communication path to go through the data conversion trunk 4b.

[0012] In the above embodiment, the case where the data conversion device is configured as a common data conversion trunk has been explained.
An echo cancellation function may be provided within the common data conversion trunk to eliminate echo noise that occurs on the wired trunk side. FIG. 4 is a block diagram of the data conversion trunk in this case, where 7 is an echo canceller and 8 is a data conversion device.The echo canceler 7 eliminates the wrap-around A that occurs on the wired trunk side.

[0013]

As described above, according to the present invention, the data conversion devices are separated and configured as a common trunk, so even if one of the data conversion devices breaks down, all data conversion can be done via the other data conversion trunk. lines are available. Furthermore, since data conversion is not involved in communication between wireless terminals, it is possible to expect simplification of H/W, reduction in transmission delay time, and improvement in reliability.

[Brief explanation of 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]

1. Wired terminal 2. Wired trunk 3 Replacement switch 4a Data conversion trunk 4b Data conversion trunk 5a Wireless trunk 5b Wireless trunk 6a Wireless terminal 6b Wireless terminal

Claims (1)

[Claims] Claim 1: In a digital switching device for switching from a wired communication system to a wireless communication system with a different transmission speed, or from a wireless communication system to a wired communication system, a digital switching device that is commonly provided in the device and that connects the wired communication system and the wireless communication system. A plurality of data conversion trunks convert data between systems, and one of the data conversion trunks in communication between a wired communication system and a wireless communication system.
and an exchange switch that exchanges both communication systems via the data exchange trunk, and exchanges both communication systems without going through the data exchange trunk in mutual communication between wireless communication systems. Device.