JPH04351028A - Multiplexer - Google Patents

Abstract

PURPOSE:To revise the arranged position of a data terminal equipment connected via a time division exchange freely, to obtain a large degree of freedom for the revision of the class, and to improve the operating efficiency of multiplex processing lines of the dynamic allocation system to be connected to the data terminal equipment at remote location. CONSTITUTION:The multiplexer accommodates a few terminal lines 41 and more number of multiplex lines 44, 45 in comparison with the number of the terminal lines, data equipments 22, 23 of a near distance are interconnected by the multiplex line 44 via an in-premises time division exchange 30, and the dynamic assignment system is applied to the multiplex line 45 to be connected to a data terminal equipment at a remote location via a communication network. An outgoing data from the lines 41-45 is received by data transmitters- receivers 11-13 and tentatively recorded in a memory 12, and each of the data transmitters-receivers 12, 13 extract a data taking the same direction of the multiplex lines 44, 45 precedingly from a memory 14, multiplex and send them.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CCITT recommendation and a data communication multiplexing device for multiplexing serial data using a speed conversion method conforming to this recommendation.

0002

2. Description of the Related Art Conventionally, this type of multiplexing apparatus has been used because a plurality of data terminals share and use one multiplexing line.
Data terminals were directly connected using connection cables, etc. For example, there is a time division multiplexer (TDM) which is a typical example of a fixed time slot allocation method.

[0003] This will be explained with reference to FIG. FIG. 2 is a block diagram showing an example of the conventional technology.

As shown in the figure, a multiplexer 90 connects a plurality of data terminals 21 to 23 via terminal lines 51 to 53 on the one hand, and connects a time division exchange via a multiplex line 54 shared by the terminals on the other hand. 30 or connect to a communication network.

[0005] Therefore, the multiplexing device 90
Terminal data transmitter/receiver 91 accommodating each of 1 to 23
.about.93 and a multiplexed line 54, and a memory 95 for temporarily storing data for forming serial data, and these are connected by a bus.

That is, serial data transmitted from the data terminal 21 is received by the terminal data transceiver 91, converted into parallel data, and stored in the memory 95. Similarly, serial data from data terminal 22 is also stored in memory 95 via terminal data transceiver 92. On the other hand, the network side serial data transmitter/receiver 94 takes out data to be output to the multiplexed line 54 accommodated therein from the memory 95, converts it into serial data according to a predetermined method, and sends it out.

[Problems to be Solved by the Invention] The conventional multiplexing device described above has a structure in which the data terminals it accommodates are directly connected by screwing the connector cable used for the terminal line. less freedom,
Furthermore, because the data terminals are installed close together due to the characteristics of the cable, there is a problem in that there is no flexibility in the location of the data terminals.

An object of the present invention is to reduce the number of data terminals to be accommodated, provide a data transmitter/receiver using a dynamic allocation method in a part of a multiplexed line to connect it to a communication network, and use the remaining multiplexed line as a time division switch. The object of the present invention is to provide a multiplexing device that solves the above problems by connecting to the internal bus of the device.

[0008]

[Means for Solving the Problems] The basic configuration of the multiplexing device according to the present invention is to operate time slots in a data communication multiplexing device that multiplexes serial data using the CCITT Recommendation and a speed conversion method that complies with this recommendation. A dynamic allocation method data transmitter/receiver that accommodates and connects multiplexed lines allocated according to time slots, a network data transmitter/receiver that accommodates and connects various multiplexed lines based on time slot allocation, and a terminal line that terminates data terminals. a terminal data transmitter/receiver, and a memory for temporarily storing serial data received by the transmitter/receiver; the transmitter/receiver extracts and multiplexes data destined for the same direction stored in the memory; transmission line.

Further, in the multiplexing device according to the present invention, the dynamic allocation type data transmitter/receiver described in the basic configuration is a CCIT.
T Recommendation V. 120 system serial data transmitter/receiver, the network data transmitter/receiver is connected to a local time division switch via a multiplexed line, and the terminal data transmitter/receiver is one; It may also be configured as a terminal adapter for a data terminal.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of the present invention.

The illustrated multiplexing device is a terminal adapter 10 in which one data terminal 21 is connected to a terminal data transmitter/receiver 11 via a terminal line 41, and other data terminals 22 and 23 are connected to a time division exchange 30. A network data transceiver 12 is connected to the communication network via a multiplex line 44, and a dynamic allocation data transceiver 13 is further connected to the communication network via a multiplex line 45.

In the terminal adapter 10, each transceiver 11, 12, 13 converts the received serial data into parallel data and stores it in the memory 14.
12 and 13 are taken out, multiplexed, and transmitted.

The network data transmitter/receiver 12 is a time division switch 30.
Since the internal bus 31 of
It is also possible to connect data terminals 22 and 23 accommodated via an integrated services digital network (ISDN) line 43, respectively.

Therefore, the data terminals 22 and 23 that can be accommodated in the same time division switch 30 can be connected to the network data transceiver 12 of one terminal adapter 10.

The dynamic allocation method data transmitter/receiver 13 uses, for example, a statistical multiplexer (ST
ATMUX: statistical multip
lexer) can be applied.

The memory 14 is connected to each data transmitter/receiver 11 to 13.
temporarily stores the received data. Each data transmitter/receiver 12/
13 takes out data destined for the same direction connected via the multiplex lines 44 and 45 accommodated by each from the memory 14, multiplexes the data, and transmits the data.

That is, data sent in the same direction can be multiplexed with data sent from any data terminal, allowing a highly flexible connection.

By connecting the dynamic allocation type data transmitter/receiver 13 to a group of terminals located at a long distance through the multiplexed line 45, lines can be used efficiently.

Therefore, the multiplexing device as the terminal adapter 10 is compatible with the CCITT Recommendation V.1 for packet terminals accommodated in the time division switch 30 as well as ISDN terminals. 1
10 and V. 120 protocol converters, and C
CITT Recommendation V. It can be used as a conversion device for 120 circuit switching and packet switching.

When the time division exchange 30 is a private branch exchange, the data terminals 21 to 23 can accommodate various types of systems, so there is not only freedom in the type of system, but also flexibility in the length of the cable to be connected.

[0021]

As explained above, the multiplexing device of the present invention accommodates a small number of terminal lines and a larger number of multiplexed lines compared to this number of lines, and connects data terminals at short distances to private branch exchanges. By connecting data terminals via multiplexed lines via a time-division switch, and by connecting to long-distance data terminals via multiplexed lines with a dynamic allocation method that allows for efficient use of lines, data terminals can The effect is that the connection of the terminal can be changed and the deployment position can be freely set.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a block diagram showing a conventional example.

[Explanation of symbols]

10 Terminal adapter (multiplexer) 11,
12, 13 Data transmitting/receiving device 14 Memory 21, 22, 23 Data terminal 30 Time division exchange 31 Internal bus

Claims (2)

[Claims] Claim 1: CCITT Recommendation and a dynamic allocation method for accommodating and connecting multiplexed lines to which time slots are dynamically allocated in a data communication multiplexing device that multiplexes serial data using a speed conversion method based on this recommendation. A data transmitter/receiver, a network data transmitter/receiver that accommodates and connects various multiplexed lines based on time slot allocation, a terminal data transmitter/receiver that accommodates and connects terminal lines that terminate data terminals, and serial data received by the transmitter/receiver. and a memory for temporarily storing data, and the transmitter/receiver extracts data destined for the same direction stored in the memory, multiplexes the data, and transmits the data to a connected multiplex line. 2. The dynamic allocation data transmitter/receiver is C.
CITT Recommendation V. 120 system serial data transmitter/receiver, the network data transmitter/receiver is connected to a local time division switch via a multiplex line, and the terminal data transmitter/receiver is one, and the terminal data transmitter/receiver is connected to the terminal data transmitter/receiver. 2. The multiplexing device according to claim 1, wherein the multiplexing device is a terminal adapter of a data terminal.