JPH05236018A - Cell multiplexing system - Google Patents

Abstract

PURPOSE:To eliminate the need for the revision of network configuration when a conventional network is replaced with a packet switching network. CONSTITUTION:A data format on a line 5 is defined as a synchronization pattern and (n) cells of an optional length and sequential numbers from 1 to (n) are imparted to cells starting from a cell just after the synchronization pattern. The sequential numbers from 1 to (n) are given to data processors 11-1n accommodated by the cell multiplexer 3 and data sent from the data processing units 11-1n are sent to a line while being set on a cell having the same number as that of the data processing unit. The cell received from the line 5 is sent to the data processing unit of the same number as that of the cell. The cell multiplexers 31, 32,...3n impart sequential numbers from 1 to (n) to terminal equipments and transfer the cell of the same number as that of the terminal equipment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to data communication, and more particularly, to a multi-drop method for terminating a plurality of terminals on one line when performing packet switching.

[0002]

2. Description of the Related Art Conventional multiplexers are used for relaying exchanges and exchanges, and when connecting terminals and exchanges, the terminals and data processing devices are physically connected one-to-one with one line. However, accurate data communication is performed by the HDLC procedure which is a data transmission procedure.

[0003]

When replacing a network in which a plurality of terminals are terminated by one line without using the HDLC procedure with a network of the HDLC procedure, not only the terminals and the exchanges are replaced but also the terminals are replaced. The object of the present invention is to provide a cell multiplexing system capable of a multi-drop system in which a plurality of terminals are terminated on one line. is there.

[0004]

A cell multiplexing system of a first invention of the present invention is a network composed of a terminal and a switch equipped with a data processing device accommodating the terminal,
The first and second cell multiplexers are provided on the terminal side and the exchange side, and when data is transferred between the terminal and the exchange, the line is activated by receiving a synchronization pattern which is a specific bit example set for each network. The state is determined, the data format on the line between the terminal and the exchange is defined as the synchronization pattern and n cells of an arbitrary length, and the cells immediately after the synchronization pattern are given sequential numbers 1 to n.

The cell multiplexing system of the second invention of the present invention is provided with a maximum of n data processing devices on the side of the exchange, and this data processing device is also given a sequential number from 1 to n. A function of placing data transmitted from a plurality of the data processing devices on a cell having the same number as the data processing device and transmitting to the line, and a function of transmitting the cell received from the line to the data processing device having the same number as the cell. It has the said 2nd cell multiplexing apparatus provided.

The cell multiplexing system of the third invention of the present invention corresponds to the function of assigning a sequential number from 1 to n to the terminal side and transferring the cell of the same number as the terminal and the baud rate of the line. , And has the first cell multiplexing device having a function of compressing / expanding terminal data.

[0007]

The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing a data flow between an exchange and a terminal.

The exchange 1 has n data processing devices 11, 1
2 to 1n and the cell multiplexing device 3, each of the data processing devices 11, 12 to 1n is provided with an on-board line 5 respectively.
1, 52, to 5n are connected to the cell multiplexer 3. The cell multiplexer 3 recognizes the cell number of the line by generating or detecting the synchronization pattern, and connects the data processing device (11, 12, 1 to 1n) corresponding to the cell number to the on-board line 5
It has a function of realizing cell multiplexing by sending a transfer clock via 1, 52, to 5n.

The terminals 21, 22, ...
1, 42, to 4n, cell multiplexers 31, 32, to 3n
Connected to. Terminal side cell multiplexers 31, 32, ...
3n also recognizes the cell number of the line by generating or detecting the synchronization pattern, and transfers the cell corresponding to the terminal number.

First, the data transmission process from the terminal side will be described. The cell multiplexer 31 notifies the exchange 1 of the activation state by transmitting a synchronization pattern to the uplink of the line 5 as shown in FIG. Other cell multiplexer 32
~ 3n inputs the transmission data from the uplink of the line 5,
By detecting the synchronization pattern, it recognizes its own time slot and maintains synchronization between terminals. Each terminal (2
1 to 2n) communicate at different transmission rates. When the data “A” and “D” are transmitted from the terminal 21, the data “B” and “E” are transmitted from the terminal 22, and the data “C” and “F” are transmitted from the terminal 2n, the respective cell multiplexers 31 to 3n respectively. It stores data and sends it to its own time slot. This data sent from each cell multiplexer (31 to 3n) is assembled as shown in FIG.

Next, the data receiving process on the terminal side will be described. As shown in FIG. 2, the cell multiplexers 31 to 3n constantly detect the synchronization pattern in the data input from the downlink of the line 5 and recognize the time slot, and the data at the time slot position of the own terminal, the terminal 21. Data “G”, “J”, data “H”, “K” to the terminal 22,
The data "I" and "L" to the terminal 2n are respectively stored and sent to the terminals 21 to 2n according to the transmission speed of the terminal itself.

Next, the data transmission process on the exchange side will be described. The cell multiplexer 3 sends a synchronization pattern to the downlink of the line 5 at regular intervals in order to notify the activation status to the terminals 21, 22 to 2n connected to the exchange 1. Within the fixed period, except for the synchronization pattern, it is divided into n times (time slots) and corresponds to the data processing devices 11, 12 to 1n in the exchange. Data “G”, “J” from the data processing device 11, data “H”, “K” from the data processing device 12, data processing terminal 1n
When the data "I" and "L" are sent from the cell multiplexer 3, the cell multiplexer 3 sends the data to the time slot corresponding to the processor number of the transmission source.

Next, the data receiving process on the exchange side will be described. The cell multiplexer 3 always detects the synchronization pattern in the data input from the uplink of the line 5. After the synchronization pattern, data "A", "D", "B", "E", "C", "F" in time slots 1 to n
Are transmitted to the corresponding on-board lines 51, 52, to 5n, respectively.

[0014]

As described above, according to the present invention, the line is multiplexed by using the cell multiplexing system and used.
A multi-drop method that terminates multiple terminals on the line becomes possible.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a data flow for explaining the operation of the present embodiment.

[Explanation of symbols]

 1 switch 11, 12, ~ 1n data processing device 21, 22, ~ 2n terminal 3, 31, 32, ~ 3n cell multiplexer 41, 42, ~ 4n private line 5 line 51, 52, ~ 5n private line

Claims (3)

[Claims] 1. A network comprising a terminal and an exchange equipped with a data processing device accommodating the terminal,
The first and second cell multiplexers are provided on the terminal side and the exchange side, and when the data is transferred between the terminal and the exchange, the activation state of the line is received by receiving a synchronization pattern which is a specific bit string set for each network. And the data format on the line between the terminal and the exchange is defined as the synchronization pattern and n cells of arbitrary length, and the cells immediately after the synchronization pattern are given sequential numbers 1 to n. Cell multiplexing. 2. The exchange side is provided with a maximum of n data processing devices, and the data processing devices are also assigned sequential numbers from 1 to n, and the data transmitted from the plurality of data processing devices are assigned. Having the second cell multiplexer having a function of transmitting to a line the cell having the same number as the data processing device and transmitting the cell received from the line to the data processing device having the same number as the cell The cell multiplexing system according to claim 1, wherein 3. A function of assigning a sequential number from 1 to n to the terminal side and transferring a cell having the same number as the terminal, and a function of compressing / expanding the data of the terminal corresponding to the baud rate of the line. The cell multiplexing system according to claim 1, further comprising the first cell multiplexing device provided.