JPH0338197A - Multi-media exchange system - Google Patents

Abstract

PURPOSE:To reduce the hardware quantity and to improve a utilizing efficiency by constituting a line exchange section as a loop line exchange dataway, connecting the dataway to a multiplex/demultiplex unit and connecting the unit to a relevant data terminal equipment. CONSTITUTION:Information I relating to a data communication destination and the data communication mode is sent from a data terminal equipment 15 of a data communication request sender. Then a multiplex/demultiplex unit 13 belonging to the terminal equipment of the data communication request sender and a multiplex/demultiplex unit 13 belonging to the terminal equipment 15 of the data communication request sender are assigned with a time slot for low speed or high speed data communication corresponding to the designated data communication mode. Moreover, a line circuit 14 being a data communication request sender and data communication destination and a data terminal equipment being data communication destination are set to the low speed or high speed data communication mode corresponding to the data communication mode to be designated. Then the data communication is started between both data terminal equipments 15 being the data communication request sender and the data communication destination.

Description

[Detailed Description of the Invention] [4 Required] A multimedia exchange that accommodates a plurality of multimedia data terminals in which a low-speed data communication mode and a high-speed data communication mode are mixed, the exchange having a loop-shaped line within the exchange. Equipped with an exchange dataway and a multiplexing/demultiplexing unit and line circuit that are not compatible with each data end connected to the exchange dataway,
By transmitting information from the data communication requesting data terminal to the data communication destination terminal and specifying low-speed or high-speed data communication mode, each line circuit and data terminal of the communication requesting source and communication destination can be set to the specified data communication speed. At the same time, low-speed or high-speed time slots corresponding to the specified data communication mode are assigned to each multiplexing/demultiplexing unit of the communication request source and communication destination, allowing low-speed and high-speed data communication to be performed within one switching system. Make it possible to change it freely.

[Field of Industrial Application] The present invention relates to a switching system for data terminals, and in particular to a switching system for realizing a multimedia switching system.

For example, in an intelligent building, there are many OA
Equipment, especially a large number of data terminals, are installed on each floor. Many data terminals are used that operate in a low-speed data communication mode, such as a mode that handles audio data or low-speed data, but as the amount of information has increased in recent years, image data such as graphic displays are also being used. It is becoming. Since this image data has a large amount of data, it will be processed in high-speed communication mode.

In this case, the exchange that performs line switching between the data terminals must be a multimedia exchange.

[Conventional technology]

Conventionally, there have been few standalone multimedia exchanges that accommodate a plurality of data terminals that operate in either low-speed data communication mode or high-speed data communication mode. Normally, data terminal groups for low-speed data communication mode and data terminal groups for high-speed data communication mode are completely separated, and switching systems for low-speed data communication media and switching systems for high-speed data communication media are separated. It is common to construct

[Problem to be solved by the invention]

As mentioned above, conventional multimedia exchanges have separate exchanges for low-speed data communication mode and high-speed data communication mode, so the first problem is that the amount of hardware is large and uneconomical. There is. Also the second
Since neither the terminal group for low-speed data communication nor the terminal group for high-speed data communication are in full operation at all times, there are naturally idle periods, and there is a problem in that the switching system as a whole is inefficiently used.

Therefore, in view of the above problems, the present invention provides a multimedia exchange system that can accommodate both a data terminal group operating in a low-speed data communication mode and a data terminal group operating in a high-speed data communication mode in one exchange. The purpose is to

[Means to solve the problem]

FIG. 1 is a block diagram showing the basic configuration of the present invention. In this figure, 11 is a multimedia exchange. A typical switchboard has at least a line switching section and line circuits for each terminal built into one ship. According to the invention, the circuit switching section is configured as a loop-shaped circuit switching dataway 12. The circuit switched dataway 12 further includes a multiplex/demultiplex unit (MIX/DBMUX) 13
and also via each line circuit (LC) 14 and subscriber line 16 to a corresponding data terminal (DTE) 1.
Connect to 5. For simplicity, only two systems of data terminals are shown. Here, the multiplexing/demultiplexing unit 13 and the line circuit 14 are adapted to be compatible with both data terminals for low-speed data communication mode and high-speed data communication mode.

[For production]

Each multiplexing/demultiplexing unit 3 can perform multiplexing and demultiplexing processing by selectively allocating time slots for low-speed data communication and time slots for high-speed data communication.

Each line circuit 14 operates by selecting either a low-speed data communication mode or a high-speed data communication mode.

On the other hand, the data terminal 15 (for example, the upper DTE in the figure) that is the source of the data communication request sends information (■) regarding the data communication destination and data communication mode specified by this terminal to the terminal that is the source of the data communication request. Belongs to said multiplex/
Separation unit 13 (upper IIUX-DE!J in the figure)
A time slot for low-speed or high-speed data communication corresponding to a designated data communication mode is allocated to the multiplexing/demultiplexing unit 13 belonging to the data terminal 15 (lower DTE in the figure) that is the data communication destination.

Furthermore, each line circuit 14 of the data communication request source and the data communication destination, and the data terminal of the data communication destination are set to a low-speed or high-speed data communication mode corresponding to the specified data communication mode. After the settings, data communication is started between the data terminals 15 that are the data communication request source and the data communication destination.

〔Example〕

FIG. 2 shows the constituent countries of one embodiment of the present invention. Note that components similar to those described above are indicated with the same reference numbers or symbols.

The loop-shaped line-switched dataway 12 is composed of, for example, an optical communication path, and a repeater (REP) 21 is inserted in the middle thereof at least for each data end that does not correspond. A control processor EC) 22 manages the human output of data running on the data way 12.

Each line circuit (LC) 14 preferably comprises a digital sampling processor (DSP) 23 and a cooperating line processor (LPR) 24, each line processor 24 also having a control bus (CBUS) 2.
Control information is exchanged with the control processor 22 via the control processor 5.

On the other hand, each data terminal 15 connected to the multimedia exchange (!JMX) 11 via each subscriber line 16 has a low-speed mode interface (low-speed I/F) 26 and a high-speed mode interface (high-speed I/F) 27. These switching is automatically performed by the processor 28. Note that the processor 28 is originally provided in each data terminal and performs data transmission and reception processing. Associated with each data terminal 15 is a communications access module (CAM) 29.

However, this CAMJ 29 may be built into each terminal 15, and functions as a so-called communication adapter.

The basic operations and operation examples performed within the exchange system of FIG. 2 will be explained below with reference to FIG. 3. FIG. 3 is a sequence diagram for explaining an example of operation based on the present invention.

(1) Basic operation ■ The processor 28 of the DTE 15 (“1”) normally uses the low-speed interface 26 to notify the CAM 29 of communication conditions.

■ Communication Access Module (CA
M) 29 and the digital sampling processor (DSP) 23 in the exchange is 2B+ at low speed.
The ink face is assumed to be D, and the interface is assumed to be 23B+D at high speed. B and D are l5D
These are the B channel and D channel under N.

■ CAM belonging to DTE "1"' that is the data communication request source
29 first uses the D channel of the low-speed interface 26 to set the communication conditions [data communication mode (communication speed), data communication destination (DTE "2")] (a in Figure 3)
is sent to the DSP 23 of the DTE "l" system.

■ This DSP 23 is a signal processing processor that can perform variable sampling from low-speed data communication mode to high-speed data communication mode, and can accommodate n lines (n in the figure). Initially, it operates in low-speed data communication mode. The communication condition information (a) transmitted through the D channel of the low-speed interface 26 is passed to the LPR 24 of the OTF "l" system.

(2) The LPR 24 identifies communication conditions from the received D channel information and determines the data communication mode of the DSP 23. It does not change at low speed, but when high speed is specified,
Switch the DSP to high speed mode.

(2) Operation example ■ Now, assuming that the communication condition from the data terminal (DTE'“1”) is low-speed data communication mode, OTE'1
The system's [lSP 23 operates in a low-speed data communication mode.

(2) The LPR 24 of the DTP "1" system notifies the CC 22 via the control bus (CBUS) 25 that the DSP 23 will now operate in the low-speed data communication mode (64 Kbps) and the data communication destination (DTε11211).

■CC22 communicates with the DT of the communication request source via CB [l525]
MUX/DEMUX 13 that accommodates B'1'''' and the communication destination data terminal DTE "2''' are accommodated! , I U X DE! , 1UX13 to allocate a 64 Kbps time slot to the designated time slot. If it's low speed, it's 64Kbps, if it's high speed, it's 2! Allocate Jbps. In other words, the time slot 7) is lengthened or shortened. In this case, the CC 22 manages all time slots, and converts all used/unused time slots into one.

■ The communication destination terminal DTεP2'' is accommodated',
IUX・DB! , 1tlX13 is DTE"2"'
Notify the system's LPR 24 of the incoming call (low-speed data communication).

■ This DTE"2°' series PR24 is compatible with [lS
Set P23 to low-speed data communication mode and
The communication conditions (communication speed) are notified to the CAMA 29 of the 2″′ system.

(2) Upon receiving this, the CAM 29 notifies the processor 28 of the OTE "2"' via the low-speed interface 26 of the DTE "2"' that a low-speed data communication has been received.

The above operation is the same when the high speed data communication mode is specified. Information a in FIG. 3 includes communication speed information and communication destination information d. C is a notification that time slot allocation has been completed, and e is an OK that the specified data communication speed has been matched.
There is a double signal. The sequence flow in Figure 3 is (1
)→(7). (7) is the original DTE “1”
This indicates that data communication between 2'' and 2'' has started.

〔Effect of the invention〕

As explained above, according to the present invention, since low-speed and high-speed data communication media are combined into one, the amount of hardware is significantly reduced, and by managing operations between low-speed and high-speed data communication, switching It is possible to increase the utilization efficiency to almost the limit.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the principle structure of the present invention, FIG. 2 is a block diagram showing an embodiment of the present invention, and FIG. 3 is a sequence diagram for explaining an operation example based on the present invention. DESCRIPTION OF SYMBOLS 11...Multimedia exchange, 12...Line switching data way, 13...Multiplex/separation unit 14...Line circuit, 5...Data terminal.

Claims (1)

[Claims] 1. Each data terminal (15) for accommodating a plurality of data terminals (15) for multimedia, each operating in either a low-speed data communication mode or a high-speed data communication mode.
15) Multimedia exchanger (11) with built-in multiple line circuits (14) and line switching section
, a loop-shaped circuit-switched dataway (12) constituting the circuit-switched section, and a circuit-switched dataway (12) and each of the line circuits (
14) multiplexing/demultiplexing units (
13), each said multiplexing/demultiplexing unit (13) selectively allocates time slots for low-speed data communication and time slots for high-speed data communication to perform multiplexing and demultiplexing processing, and each of said line circuits (14) ) operates by selecting either the low-speed data communication mode or the high-speed data communication mode, and receives information from the data terminal (15) that is the source of the data communication request regarding the data communication destination and data communication mode specified by this terminal. to the multiplexing/demultiplexing unit (13) belonging to the terminal (15) that is the source of the data communication request and the multiplexing/demultiplexing unit (13) belonging to the data terminal (15) that is the data communication destination. allocating a time slot for the low-speed or high-speed data communication corresponding to the data communication mode of the data communication mode, and each of the line circuits (14) of the data communication request source and the data communication destination, and the data terminal (14) of the data communication destination.
5) is set to a low-speed or high-speed data communication mode corresponding to a designated data communication mode, and then data communication is started between the data communication request source and data communication destination data terminals (15). Multimedia exchange method.