JPH02277353A - Key system - Google Patents

Abstract

PURPOSE:To attain the coincidence of the attributes of a terminal and a wide area network by housing each terminal which handles multi-media data, providing a switching function to offer communication between the terminals with the same attributes, and providing a voice compression function and an image compression function incidentally with them. CONSTITUTION:When speech is performed between extensions by telephone sets 102 by setting an ordinary call, a main device 101 outputs input data from an outgoing telephone set to an incoming telephone set transparently when the telephone sets 102 of the extensions are provided with the same attributes. When the attributes are different, the coincidence of the attributes can be attained by transferring the input data to a function extension part (1) 103. The same operation is performed when the speech between the telephone set 102 and the wide area network is performed. Communication between high function terminals 104 is performed by using the switching function of a function extension part (2) 105. When the high function terminals 104 perform the communication via the wide area network 106, the attribute of the high function terminal 104 is conformed to that of the wide area network 106 by the function of the function extension part (2) 105, then, the communication can be performed via the main device 101.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a key system that utilizes the L5DN network, and particularly to a key system that effectively accommodates high-speed terminals and low-speed terminals having attributes different from those of the L5DN network. , relates to a key system that efficiently utilizes relatively low-speed public lines for terminals.

(Prior art) Figure 5 shows the configuration of a conventional key system. This system is connected to a digital or analog wide area network, and various analog or digital terminals (voice terminals 2, 2, ', 2''--telephone, image terminal 3.3'--video phone, etc.) are connected.The operation of this system will be explained below using a voice terminal as an example.

When a voice terminal 2 connected to the key system main device 1 attempts to set up a call with a remote voice terminal via a wide area network, the voice terminal 2 sends call setting information to the main device 1, The main device 1 provides exchange processing according to the invocation setting information. Thereafter, a call is made between the voice terminals using signals having attributes that match those of the wide area network. In the exchange process, the main device 1 only provides l-transparent processing for the input data, and the input data from the audio terminal 2 and the output data from the main device 1 basically have the same attributes. 9 □CQ□ (Problem to be solved by the invention) However, when connecting a terminal with attributes different from the wide area network to the above system and setting up a call with a terminal in a remote location via the wide area network, the conventional system In this case, it was necessary to change the wide area network and terminal attributes on the terminal 2 side, such as by connecting a modem to terminal 2. Therefore, communication between extension terminals 2 and 2 connected to main unit 1 was changed. However, when doing so, it has the disadvantage that the original functions of the terminal cannot be fully utilized, and the cost increases in proportion to the number of terminals.

The present invention connects terminals with different attributes to a wide area network, provides high-performance services between extension lines, and uses the high-performance terminal to communicate with a high-performance terminal in a remote location via a wide area network. The purpose is to solve the above-mentioned drawbacks that occur.

(Means for Solving the Problems) The present invention provides a key system connected to an ISDN line, in which the main device accommodates various terminals handling multimedia data such as audio, images, data, etc., and has the same attributes. In addition to having an exchange function for providing communication between terminals, a function expansion section is provided to add functions such as an audio compression device and an image compression device depending on the system configuration.

(Function) By adopting the above configuration, high-quality data can always be exchanged between extensions in communication between high-speed image terminals connected to the main device of the key system, and wide area network In communication via the image compression device, the attributes of the terminal and the wide area network can be easily matched without increasing the load on the terminal by passing through the function expansion unit of the image compression device.

Therefore, when providing communication between the main devices having the above configuration connected to the 15DN line, it is possible to simultaneously provide a plurality of audio and image data to the basic equipment/F.

(Example) Examples of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows the basic concept of the present invention. This system consists of a main device 101 that has basic functions related to the key system such as exchange processing, a telephone connected to this main device 101, and a telephone connected to this main device 101.
Function expansion unit (1) 103 related to telephone functions in 1;
A high-function terminal 104 and a function expansion unit (2>10
Consisting of 5.

The operations when a telephone is connected and when a high-performance terminal is connected in the above configuration will be explained.

■When the telephone 102 sets up a normal call between extensions and makes a call, the main device 102 receives the call setting information from the calling telephone.
1 performs exchange processing and sets up a call with the destination telephone.

If the telephones 102 between the extensions have the same attributes, the main device 101 transmits the input data from the calling telephone to a transparent terminal according to the call setting information. Output to I-telephone.

If the attributes of the telephones 102 between the extensions are different, the main device 101 transfers the input data from the calling telephone to the telephone function-related function expansion unit (1) 10B to determine whether the attributes match the calling telephone. .

When the telephone set 102 sets up a call with a remote telephone set via the wide area network 106, if the attributes of the calling and called parties match, the main device IO1 follows the call setting information from the calling telephone 102. Set up a call with the called party's telephone. If the attributes of the originating telephone 102 and the receiving telephone are different, the main device 101 uses the function expansion unit 1103 related to telephone functions to ensure that their attributes match. In addition to converting attributes between terminals, similar processing is performed when the attributes of the originating telephone 102, the receiving telephone 102, and the wide area network 106 do not match.

Function expansion unit (1) 10B not only measures the matching of attributes between telephones 102 and between telephones 102 and wide area network 106 as described above, but also performs wide area matching even when the attributes of telephones 102 and wide area network 106 match. In order to make effective use of the M106, the attributes of the telephone function may be converted to those of the wide area network 106.

The operation when the high-performance terminal 104 is connected to the 0th order will be explained. The high-performance terminal 104 is a high-performance terminal 104 in the extension.
When exchanging data between each other, function extension section (2) 1
Communication is performed by using the switch function of 05.

At this time, the attributes between the terminals match, and no attribute conversion is performed. When the high-performance terminal 104 exchanges data with a high-performance terminal in a remote location via the wide area network 106, the high-performance terminal 1
04 and the attributes of the wide area network 106 do not match. Lick function extension unit (2) After matching the attributes of the high-performance terminal 104 with the attributes of the wide area network 106 using the function of 105, exchange using the exchange function of Dosei W101. It performs processing and connects to the wide area network 106. At this time, data from the telephone 102 may be handled simultaneously with data from the high-performance terminal 104.

FIG. 2 shows the first embodiment, in which the main device 201 of the key system is a line 1/F section 202 that provides a lower call control layer.
, a call control exchange processing unit 203 that provides a call control upper layer and exchange processing, and an audio codec pool 20 that performs audio compression.
4. Image codec pool 205 that compresses image signals
, a video switch 206 for switching image signals. The main device 201 has an S point I/ on the extension side.
An ISDN telephone 207 is connected through F, and a high-speed image terminal 208 is connected through a baseband signal I/F. The high-speed image terminal 208 is integrated with an 15DN telephone 207 connected to the main device 201 by S point /F. The wide area network is an ISDN network 209, and the main device 201 is connected to the DSU 210 via a T point I/F.

The operations when an ISDN telephone and a high-speed image terminal are connected in the above configuration will be explained.

[Phase] When the l5DN telephone 207 sets up a call between extensions, the l5DN telephone 207 sends call setting information to the main device 201 via eight points.

The line I/F section 202 of the main device 201 sends call control information to the call control/switching processing section 203 according to the call setting information. The call control/switching processing unit 203 calls the destination l5 according to the call control information.
A call is set up with the DN telephone set 207 and the call is secured between the ends. When a call is set up and a conversation is made between extensions, the attributes of the ISDN telephones 207 on the originating and terminating sides are the same.

Next, the l5DN telephone 207 is connected to the main device 201゜l5DN.
The case where a call is set up with a remote ISDN telephone via the network 209 will be described. When only one ISDN telephone 207 requests call setup and makes a call, the main device 201 transfers the voice data to the voice codec pool 2.
04 (exchange processing is performed at a speed (64 Kb/s) consistent with the ISDN network 209).
It is sent to the N network 209. On the other hand, N units of l5DN telephones 207 are connected to a plurality of l5DN telephones 207 connected to the same main device at a remote location.
When setting up a call with a DN telephone and making a conversation, the voice data from each extension in the main device 201 on the originating side is compressed to 1/N (N-2) of the network in the voice codec pool, and then compressed again to N The books are bundled and sent as 64 kb/s audio data to the 15ND network 209 via point T.

(2) A case where the high-speed image terminal 208 performs communication will be described below. When the high-speed image terminal 208 exchanges data between extensions, the ISDN telephone logically integrated into each high-speed image terminal sends call setting information to the main device 201, and the main device 201 receives the call setting information. The video switch 206 is switched based on
15D logically integrated into the destination high-speed image terminal
A call is made to the N telephone and a voice line is set. At this time, the attributes of the calling and receiving image terminals match, and the video signal does not pass through the image codec pool 205.

The high-speed image terminal 208 is the main device 201, and the l5DN network 20
The case where data is exchanged with a high-speed image terminal at a remote location via 9 will be described. At the originating high-speed image terminal 208, the terminating TS is logically integrated with the terminating high-speed image terminal by making a call from the logically integrated l5DN telephone.
Set up a call using the ISDN information channel on the DNSDN telephone. Next, the call setup and call settings for the originating and terminating main devices are performed according to the call control information set by the ISDN telephone.
The exchange processing unit switches the video switch and
A data communication path between image terminals is secured using the other information channel of the DN. At this time, the high-speed image terminal 208
Since the data attributes in the ISDN network 209 and the data attributes in the ISDN network 209 are different, the video data is compressed via the image codec Boolean of the originating and destination main devices, and after matching the attributes, the exchange processing unit l5DN#12 via 203
Send to 09.

FIG. 3 shows a configuration in which a terminal adapter for an analog terminal is added in place of the audio codec shown in FIG. FIG. 4 shows a configuration in which audio and image data are multiplexed in a high-speed image terminal.

(Effects of the Invention) According to the present invention, the basic usage of the key system can be handled with only the basic functions of the main device, while high-quality data can be obtained between extensions, such as when a high-speed image terminal is connected. In addition, when connecting to a wide area network, it is easy to add a function expansion section according to the application, such as adding an image codec on the main device side without putting a burden on the terminal side. This makes it possible to efficiently configure various systems.

[Brief explanation of drawings]

Fig. 1 is a basic conceptual diagram of the present invention, Fig. 2 is a first embodiment of the present invention, Fig. 3 is a second embodiment, Fig. 4 is a third embodiment, and Fig. 5 is a conventional An example of system configuration is shown. 101: Main device basic functions 102・Telephone (terminal) 1032 Function expansion unit (]) 104, High function terminal (terminal) 105 Function expansion unit (2)

Claims (1)

[Claims] (1) In the key system connected to the ISDN line,
The main unit accommodates various terminals that handle multimedia data such as audio, images, data, etc., and has an exchange function that provides communication between terminals with the same attributes. A key system characterized by having a function expansion section that adds functions such as an audio compression device and an image compression device.