JPH08130548A - System and method for time-division multiplex transmission - Google Patents

Abstract

PURPOSE: To improve the capacity of transmission without increasing a transmission speed by connecting respective equipments having terminal interface parts provided with plural transmitting/receiving parts, decoding parts, encoding parts, and transmission control parts by transmission lines corresponding to the number of transmission parts. CONSTITUTION: A terminal interface part 6 in each time-division multiplex transmission equipment 11 is constituted of two receiving and transmitting registers 5, 7 and two receiving and transmitting buses 4, 8, a transmission control part 3, a decoding part 2 and a receiving part 1 are connected to each of the two receiving buses 4 and a transmission control part 3, an encoding part 9 and a transmission part 10 are connected to each of the two transmitting buses 8. Plural transmission equipments 11 arranged on required positions are mutually connected like a ring through two transmission lines 12 and a time-division multiplex PCM signal in each frame constituted of plural time slots is circulated through the transmission lines 12. Transmitting data from a terminal equipment are inputted to the interface part 6 and temporarily stored in the two transmitting registers 7 to transmit/receive the data in accordance with the circulation of transmission frames.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a time division multiplex transmission system and a time division multiplex transmission method using a plurality of time division multiplex transmission devices.

[0002]

2. Description of the Related Art A schematic configuration and operation of a time division multiplex transmission system using a plurality of time division multiplex transmission devices according to the prior art will be described with reference to a conventional example shown in FIG.

In FIG. 3, 41 is a time division multiplex transmission device (hereinafter referred to as a station) installed at a required place, 31 is a receiving unit, 32 is a decoding unit, 33 is a transmission control unit, and 34 is for receiving. A bus, 35 is a reception register, 36 is a terminal interface unit, 37 is a transmission register, 38 is a transmission bus, 39 is an encoding unit, 40 is a transmission unit, and 42 is a transmission line connecting a plurality of stations 41.

The station 41 has a plurality of terminal interface sections 36 (only one terminal interface section 36 is shown in FIG. 3), and each terminal interface section 36 is an interface register for exchanging data. It is composed of a certain receiving register 35 and a certain transmitting register 37, and a receiving bus 34 and a transmitting bus 38 which are internal buses.

The plurality of stations 41 have the same configuration and are connected to a terminal device (not shown) by the terminal interface section 36 of each station 41.

A plurality of stations 41 installed at required places are connected in a ring shape by a transmission line 42 such as an optical fiber line and a cable line, and the plurality of stations 4 are connected.
1 and the transmission path 42 constitute a time division multiplex transmission system, and the time division multiplex PCM signal of a transmission frame unit composed of a plurality of time slots is transmitted by the station 4
1, the transmission line 42, the next station 41, and the transmission line 42 ...

Each time slot constituting the transmission frame of the time division multiplex PCM signal is a terminal interface section 36.
, A logical line is constructed by exchanging data from a terminal device (not shown).

At a certain station 41, transmission data from a terminal device (not shown) is input to a terminal interface section 36, converted from a serial signal to a parallel signal and then temporarily stored in a transmission register 37, and a transmission frame is circulated. Data will be exchanged according to.

The transmission data stored in the transmission register 37 is transmitted to the transmission line 42 via the transmission bus 38, the transmission control unit 33, the encoding unit 39, and the transmission unit 40.

In another station 41, the transmission line 4
The received data transmitted by No. 2 and passed through the reception unit 31, the decoding unit 32, and the transmission control unit 33 is stored in the reception register 35 via the reception bus 34.

The reception data stored in the reception register 35 is converted from a parallel signal to a serial signal, and then the reception data is exchanged with the terminal device (not shown) from the terminal interface section 36.

In a conventional time division multiplex transmission system using a plurality of time division multiplex transmission devices, a cycle in which a transmission frame of a time division multiplex PCM signal for transmitting data circulates through a plurality of stations 41 and a transmission path 42. Since it is fixed and the frame length is also fixed, the data transmission capacity is limited.

In order to increase the data transmission capacity, it is necessary to remodel each section in the station 41 including the transmission control section 33 on a large scale or newly develop it, which is very economical.

As another means, there is a means for increasing the transmission capacity by providing a plurality of ring-shaped transmission lines 42 for connecting a plurality of stations 41. In the case of the circuit switching system, this means is another ring-shaped line. Since it is not possible to connect with, there will be restrictions when switching the connection partner by dialing such as telephone.

[0015]

In the conventional time division multiplex transmission system and time division multiplex transmission method using a plurality of time division multiplex transmission devices, the cycle in which a transmission frame circulates is fixed, and the frame length is fixed. Since the transmission capacity is limited, the transmission capacity is limited, and in order to increase the transmission capacity, it is necessary to modify or newly develop the station including the transmission control unit on a large scale. It was

In order to solve the above problems, the present invention provides a plurality of transmission control units, a decoding unit, an encoding unit, a receiving unit, and a transmitting unit for one terminal interface unit to form a plurality of transmission lines and a transmission speed. An object of the present invention is to provide a time division multiplex transmission system and a time division multiplex transmission method using a plurality of time division multiplex transmission devices capable of improving the transmission capacity without increasing the speed.

[0017]

In order to achieve the above object, a time division multiplex transmission system of the present invention comprises a plurality of time division multiplex transmission devices and a transmission line connecting the plurality of time division multiplex transmission devices. In a time division multiplex transmission system comprising: a plurality of time division multiplex transmission devices, a plurality of reception units, a decoding unit, a transmission control unit, a plurality of transmission units, an encoding unit, a transmission control unit, and a plurality of reception registers. Each has a plurality of terminal interface units each including a transmission register, and has the same number of transmission paths as the plurality of transmission units that connect the plurality of time division multiplex transmission devices.

Further, the time division multiplexing transmission method of the present invention comprises a plurality of receiving units, a decoding unit, a transmission control unit, a plurality of transmitting units, an encoding unit, a transmission control unit, a plurality of receiving registers and transmission registers. A time division multiplex transmission system including a plurality of time division multiplex transmission devices each having a plurality of terminal interface units, and the same number of transmission lines as the plurality of transmission units connecting the plurality of time division multiplex transmission devices In addition, the plurality of transmission frames each constituted by a plurality of time slots are circulated, and the stored terminal device data is stored in the terminal interface unit that stores data from the terminal device in accordance with the circling of the plurality of transmission frames. The data is divided into the plurality of transmission frames, transmitted and received, and transmitted to the plurality of transmission paths.

Further, the time division multiplexing transmission method of the present invention comprises a plurality of receiving units, a decoding unit, a transmission control unit, a plurality of transmitting units, an encoding unit, a transmission control unit, a plurality of receiving registers and transmission registers. A time division multiplex transmission system including a plurality of time division multiplex transmission devices each having a plurality of terminal interface units, and the same number of transmission lines as the plurality of transmission units connecting the plurality of time division multiplex transmission devices In addition, a plurality of transmission frames each composed of a plurality of time slots are circulated, and the plurality of transmission frames received from the plurality of transmission lines are divided and transmitted and received in accordance with the circulation of the plurality of transmission frames. The terminal device data is collected in the terminal device data before being divided by the terminal interface unit.

[0020]

A time division multiplex transmission system according to the present invention is a time division multiplex transmission system comprising a plurality of time division multiplex transmission devices and a transmission line connecting the plurality of time division multiplex transmission devices. The time division multiplex transmission device includes a plurality of receiving units, a decoding unit, a transmission control unit, a plurality of transmission units, an encoding unit, a transmission control unit, and a plurality of terminal interface units including a plurality of reception registers and transmission registers. Each of them has the same number of transmission paths as the plurality of transmission units that connect the plurality of time division multiplex transmission apparatuses, and transmits data from a terminal device to a plurality of circuits that go around the time division multiplex transmission system. It is transmitted and received after being divided into transmission frames.

Further, the time division multiplex transmission method of the present invention comprises a plurality of receiving units, a decoding unit, a transmission control unit, a plurality of transmitting units, an encoding unit, a transmission control unit, a plurality of receiving registers and transmission registers. A time division multiplex transmission system including a plurality of time division multiplex transmission devices each having a plurality of terminal interface units, and the same number of transmission lines as the plurality of transmission units connecting the plurality of time division multiplex transmission devices In addition, the plurality of transmission frames each constituted by a plurality of time slots are circulated, and the stored terminal device data is stored in the terminal interface unit that stores data from the terminal device in accordance with the circling of the plurality of transmission frames. The data is divided into the plurality of transmission frames, transmitted and received, sent out to the plurality of transmission lines, and received from the plurality of transmission lines in accordance with the circulation of the plurality of transmission frames. The terminal data being exchanged by dividing the number of transmission frames, summarized in the terminal device data before division by the terminal interface unit.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A schematic configuration and operation of a time division multiplex transmission system using a plurality of time division multiplex transmission devices according to the present invention is shown in FIG.
2 and the embodiment shown in FIG.

FIG. 1 shows an embodiment in which the transmission capacity is doubled in the conventional time division multiplex transmission system using a plurality of time division multiplex transmission devices.

In FIG. 1, 11 is a time division multiplex transmission device (hereinafter referred to as a station) installed at a required place, 1 is a receiving unit, 2 is a decoding unit, 3 is a transmission control unit, 4
Is a reception bus, 5 is a reception register, 6 is a terminal interface unit, 7 is a transmission register, 8 is a transmission bus, 9 is an encoding unit, 10 is a transmission unit, and 12 is an optical fiber line connecting a plurality of stations 11. , A transmission line such as a cable line.

The station 11 has a plurality of terminal interface units 6 (only one terminal interface unit 6 is shown in FIG. 1), and each terminal interface unit 6 is an interface register for exchanging data. There are two receiving registers 5 and two transmitting registers 7, two receiving buses 4 and two transmitting buses 8 which are internal buses.
It consists of

Further, the transmission control unit 3, the decoding unit 2, and the reception unit 1 are connected to the two reception buses 4, and the transmission control unit 3 and the encoding unit are connected to the two transmission buses 8. The unit 9 and the transmission unit 10 are connected.

The stations 11 have the same configuration and are connected to a terminal device (not shown) by the terminal interface section 6 of each station 11. Multiple stations 11 installed at required locations
Is connected in a ring shape by two transmission lines 12 and connects a plurality of stations 11 to each station 2
The time-division multiplex transmission system including the transmission line 12 of the book constitutes a time-division multiplex PCM signal of a transmission frame unit composed of a plurality of time slots.
One or two transmission lines 12, a next station 11, and two transmission lines 12 ...

The time slots forming the transmission frame of the time division multiplexed PCM signal form a logical line by exchanging data with a terminal device (not shown) in the terminal interface section 6.

Transmission data from a terminal device (not shown) is input to the terminal interface unit 6 and temporarily stored in the two transmission registers 7, and data is exchanged in accordance with the circulation of the transmission frame. In the prior art, only one transmission frame circulates, but in the present invention, two transmission frames circulate in parallel, so the transmission capacity is doubled.

Also in reception, the terminal interface unit 6
The data received from the two transmission frames circulating through the two transmission lines 12 are received by the two reception registers 5
It is temporarily stored in and is sent to the terminal device according to the communication condition with the terminal device (not shown).

In the present invention, as described above, the transmission line 1
The number of 2 becomes 2, but if transmission is performed using the same time slot of the same two transmission frames, the transmission capacity of one time slot will only apparently increase, and circuit switching will be possible.

FIG. 2 shows a detailed embodiment of the terminal interface section 6 to explain the operation.

First, the transmission side will be described.

Transmission data from a terminal device (not shown) is input to a terminal interface 60, converted into a signal of a required level, and a FIFO (First In First Out) circuit 6 is provided.
Input to 1.

The transmission data, which is the serial signal output from the FIFO circuit 61, is input to the serial / parallel conversion circuit 62, converted from the serial signal to the parallel signal, and stored in the two transmission registers 7.

The transmission data stored in the two transmission registers 7 are transmitted from the terminal interface unit 6 to the two transmission control units 3 and the two encoding units 9 via the two transmission buses 8.
It is sent to the two transmission lines 12 via the two transmitters 10.

At the time of this transmission, since data transmission is performed by the two transmission lines 12 using two transmission frames,
It is necessary to instruct which of the data sent from the two transmission registers 7 is processed first by the receiving side.

In the present embodiment, "1" is stored in the first 1 bit of one of the two transmission registers 7 and "0" is stored in the first 1 bit of the other of the two transmission registers 7, and two transmission registers 7 are used in accordance with the transmission timing signal 63. The data is output to the bus 8.

Next, the receiving side will be described.

On the receiving side, the data transmitted from the two transmission lines 12 via the two receiving sections 1, the two decoding sections 2 and the two transmission control sections are converted into two data in accordance with the reception timing signal 64. The data is stored in the two reception registers 5 via the reception bus 4.

In the present embodiment, the leading 1 bit of the two receiving registers 5 is "0" or "1", and if the leading 1 bit of one receiving register 5 is "0", the leading 1 is 1.
The counter unit 65 detects that the bit is "0" (by a NAND circuit or the like), enables one gate circuit 66 without counting, and outputs the data to the parallel / serial conversion unit 67.

If the first 1 bit is "1", the counter section 65 counts the same number of clocks as the number of clocks required for parallel / serial conversion, delays the clock, and then the gate circuit 66 is enabled.

In this way, the FIs are transmitted in the order of transmission.
Data is stored in the FO circuit 68, and the terminal interface 6
It is possible to send the data to the terminal device (not shown) via 9.

[0044]

According to the present invention, a plurality of transmission control units, a decoding unit, an encoding unit, a receiving unit, and a transmitting unit are provided for one terminal interface unit, and a plurality of transmission lines are provided to increase the transmission speed. It is possible to provide a time division multiplex transmission system using a plurality of time division multiplex transmission devices capable of improving the transmission capacity without doing so.

[Brief description of drawings]

FIG. 1 is a block diagram of a time division multiplex transmission system using a plurality of time division multiplex transmission devices according to the present invention.

FIG. 2 is a block diagram of a terminal interface unit used in the time division multiplex transmission apparatus according to the present invention.

FIG. 3 is a block diagram of a conventional time division multiplex transmission system using a plurality of conventional time division multiplex transmission devices.

[Explanation of symbols]

 1, 31 reception unit 2, 32 decoding unit 3, 33 transmission control unit 4, 34 reception bus 5, 35 reception register 6, 36 terminal interface unit 7, 37 transmission register 8, 38 transmission bus 9, 39 encoding unit 10, 40 transmitter 11, 41 time division multiplex transmission device 12, 42 transmission line 60, 69 terminal interface 61, 68 FIFO circuit 62 serial / parallel conversion circuit 65 counter unit 66 gate circuit 67 parallel / serial conversion circuit

Claims (4)

[Claims] 1. A time division multiplex transmission system comprising a plurality of time division multiplex transmission devices and a transmission line connecting the plurality of time division multiplex transmission devices, wherein the plurality of time division multiplex transmission devices are plural. A plurality of terminal interface units each including a reception unit, a decoding unit, a transmission control unit, a plurality of transmission units, an encoding unit, a transmission control unit, and a plurality of reception registers and transmission registers. A time division multiplex transmission system comprising the same number of transmission lines as the plurality of transmission units connecting the time division multiplex transmission devices. 2. The terminal interface unit having a plurality of receiving registers and a transmitting register according to claim 1, wherein the terminal interface section has a plurality of gate circuits and counters connected to the plurality of receiving registers, a parallel / serial conversion circuit, and a FIFO. A time division multiplex transmission system comprising a circuit, a terminal interface, a serial / parallel conversion circuit connected to a plurality of transmission registers, a FIFO circuit, and a terminal interface. 3. A reception section, a decoding section, a transmission control section, a plurality of transmission sections, an encoding section, a transmission control section, and a plurality of terminal interface sections each having a plurality of reception registers and transmission registers. A time division multiplex transmission system including a plurality of time division multiplex transmission devices and the same number of transmission lines as the plurality of transmission units connecting the plurality of time division multiplex transmission devices, each including a plurality of time slots The transmitted plurality of transmission frames are circulated, and the stored terminal device data is divided into the plurality of transmission frames and transmitted / received in accordance with the circulation of the plurality of transmission frames, by the terminal interface unit storing the data from the terminal device. Then, the time-division multiplex transmission method is characterized in that the data is transmitted to the plurality of transmission paths. 4. A plurality of receiving units, a decoding unit, a transmission control unit, a plurality of transmission units, an encoding unit, a transmission control unit, and a plurality of terminal interface units each having a plurality of reception registers and transmission registers. A time division multiplex transmission system including a plurality of time division multiplex transmission devices and the same number of transmission lines as the plurality of transmission units connecting the plurality of time division multiplex transmission devices, each including a plurality of time slots In the terminal interface unit, the plurality of transmission frames are circulated, and the terminal interface data is transmitted / received by dividing the plurality of transmission frames received from the plurality of transmission paths in accordance with the circling of the plurality of transmission frames. A time-division multiplex transmission system characterized by collecting terminal data before division.