JPH0773277B2 - Communication device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication device for connecting a plurality of devices by wire to allow them to communicate with each other.

2. Description of the Related Art In recent years, data communication on a premises called a local area network (hereinafter referred to as LAN) has become popular. An example of the communication device in the above-mentioned conventional token ring will be described below with reference to the drawings.

FIG. 5 is a block diagram of a conventional communication device. In FIG. 5, 101 is a bypass circuit, 102 is a baseband signal processing circuit, 103 is a data processing circuit, 104 is a bypass drive circuit, 105 is a bypass control circuit, 106 is a node,
107 is a terminal.

The operation of the communication device configured as described above will be described below.

First, in the initial state, since there is no bypass control signal from the terminal 107, the bypass control circuit 105 controls the bypass circuit 101 to the bypass state, and the baseband signal input from the network bypasses the terminal 107 and is output to the network. To be done.

When the communication device starts data communication, the data processing circuit 103 of the terminal 107 gives the bypass drive circuit 104 an instruction to drive the bypass control signal. The bypass drive circuit 104 drives the bypass control signal according to an instruction from the data processing circuit 103. The bypass control circuit 105 of the node 106 switches the bypass circuit 101 by the bypass control signal from the terminal 107. By doing so, the baseband signal input from the network is output to the terminal 107 via the node 106, and the baseband signal output from the terminal 107 is output to the network via the node 106. Is incorporated into the network.

Thereafter, the baseband signal input from the network via the node 106 is the baseband processing circuit 1 of the terminal 107.
The data is processed in 02 and passed to the data processing circuit 103. The data processing circuit 103 transfers the data to the baseband processing circuit 102 again after the data processing. The baseband processing circuit 102 converts the data into a baseband signal and outputs it to the network via the node 106.

However, in the above-mentioned configuration, since only baseband signals can be handled, data is transmitted by time division multiplexing, so that the transmission capacity is limited, and continuous signals such as voice / image and There is a problem that a plurality of networks must be constructed because a wide band signal cannot be transmitted.

In view of the above problems, the present invention provides a communication device which can secure a large transmission capacity and at the same time can transmit a continuous signal or a wideband signal by one network.

Means for Solving the Problems In order to solve the above-mentioned problems, a communication device of the present invention separates a signal from a network into a baseband signal and a broadband signal by a first separation circuit and a first separation circuit. A baseband signal bypass circuit that switches between outputting the generated baseband signal to the terminal side or bypassing the terminal to the network side, and outputting the broadband signal separated by the first separation circuit to the terminal side or the terminal From the terminal and a broadband signal bypass circuit that switches between bypassing and outputting to the network side, a first multiplexing circuit that multiplexes the baseband signal bypass circuit and the terminal side output of the broadband signal bypass circuit, and outputs the multiplexed signal to the terminal. A second separation circuit for separating the input signal into a baseband signal and a broadband signal; Controls the baseband signal bypass circuit and the broadband signal bypass circuit by a second multiplexing circuit that multiplexes the network side outputs of the baseband signal bypass circuit and the broadband signal bypass circuit and outputs the multiplexed signal to the network, and the bypass control signal from the terminal. A bypass control circuit, a third separation circuit that separates a signal from the node into a baseband signal and a broadband signal, and a baseband signal from the third separation circuit, and converts the received signal to data. Or a baseband signal processing circuit for converting data to a baseband signal, and receiving a broadband signal from the third separation circuit and converting it to data, or converting data to a broadband signal. Broadband signal processing circuit and baseband signal processing From the data processing circuit that exchanges data with other communication devices via the channel and the broadband signal processing circuit, the third multiplexing circuit that multiplexes the outputs of the baseband signal processing circuit and the broadband signal processing circuit, and the data processing circuit. It is provided with a configuration called a terminal including a bypass drive circuit that outputs a bypass control signal under the control of.

Action The present invention time-division-multiplexes the baseband signal with the above-described configuration, and at the same time frequency-multiplexes the baseband signal and the broadband signal to secure a large transmission capacity with the multiplexed broadband signal, and at the same time,
It becomes possible to transmit a continuous signal or a wideband signal.

Example A communication apparatus according to an example of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a communication device according to the first embodiment of the present invention. In FIG. 1, 1 is a separation circuit, 2 is a baseband signal bypass circuit, 3 is a broadband signal bypass circuit, 4 is a multiplexing circuit, 5 is a separation circuit, 6 is a baseband signal processing circuit, and 7 is a broadband signal. Processing circuit, 8 is a data processing circuit, 9 is a multiplexing circuit, 10 is a bypass drive circuit, 11 is a bypass control circuit,
12 is a separation circuit, 13 is a multiplexing circuit, 14 is a node, and 15 is a terminal.

The operation of the communication device configured as described above will be described below with reference to FIG.

First, FIG. 2 shows a connection form of a network. In the initial state, since there are no bypass control signals for the baseband signal and the broadband signal from the terminal 15, the bypass control circuit 11 controls the bypass circuits 2/3 for the baseband signal and the broadband signal to the bypass state, and The signal input from the terminal 15
Is bypassed and output to the network.

When the communication device starts data communication, the data processing circuit 8 of the terminal 15 gives the bypass drive circuit 10 an instruction to drive the bypass control signal. The bypass drive circuit 10 drives a bypass control signal according to an instruction from the data processing circuit 8. The bypass control circuit 11 of the node 14 switches the bypass circuit 2/3 by the bypass control signal from the terminal 15. By doing so, the signal input from the network is output to the terminal 15 via the node 14 and the terminal 15
Is incorporated into the network.

Then, the signal input from the network is separated by the separation circuit 1 into a baseband signal and a broadband signal.
The separated signals are respectively input to the bypass circuit 2/3, bypassed or multiplexed again by the multiplexing circuit 4 and output to the terminal 15. In the terminal 15, the demultiplexing circuit 5 demultiplexes the multiplexed signal input from the node 14 into a baseband signal and a broadband signal.
It is processed at 6/7 and the data is passed to the data processing circuit 8. The data processing circuit 8 again passes the data to the respective signal processing circuits 6/7 after the data processing. Each signal processing circuit 6/7 converts the data into each signal, multiplexes it by the multiplexing circuit 9, and outputs it to the node 14. In the node 14, the multiplexed signal input from the terminal 15 is separated into a baseband signal and a broadband signal by the demultiplexing circuit 12 and input to the respective bypass circuits 2/3. Then, at the output of the bypass circuit 2/3 on the network side, the baseband signal and the broadband signal are multiplexed by the multiplexing circuit 13 and output to the network.

It should be noted that it is possible to accommodate a terminal (FIG. 5 107) capable of supporting only conventional baseband signals on the same network.
Baseband and broadband signals can be bypassed independently. That is, since the conventional terminal 107 cannot drive the bypass control signal for the broadband signal, the node outputs only the baseband signal to the terminal 107, and the broadband signal bypasses the terminal 107 and outputs to the network.

As described above, according to the present embodiment, the broadband signal can be freely used by multiplexing the baseband signal and the broadband signal, and the continuous signal and the broadband signal can be transmitted and the large capacity transmission can be performed. Is possible.

In the first embodiment, the nodes are separated one by one, and the baseband signal and the broadband signal are multiplexed and connected between the nodes. However, a number of the nodes are combined into one concentrator. (See Fig. 3 and Fig. 4). After separating the baseband signal and the broadband signal by the separation circuit at the input of the concentrator, the baseband signal and the broadband signal are separated and connected between each node and the final concentrator. Multiplexing at the output of the device may be used. By doing so, it is possible to omit the separation circuit and the multiplexing circuit required for input / output of each node.

EFFECTS OF THE INVENTION As described above, according to the present invention, the first separation circuit that separates the signal input from the network into the baseband signal and the broadband signal, and the baseband signal separated by the first separation circuit on the terminal side. A baseband signal bypass circuit that switches between outputting to the terminal or bypassing the terminal to the network side, and outputting the broadband signal separated by the first separation circuit to the terminal side or bypassing the terminal and outputting to the network side. A broadband signal bypass circuit for switching whether to perform switching, a baseband signal bypass circuit, a first multiplexing circuit that multiplexes the terminal-side outputs of the broadband signal bypass circuit and outputs the multiplexed signal to the terminal, and a signal that is input from the terminal as a base. A second separation circuit for separating a band signal and a broadband signal, and the baseband A second multiplexing circuit that multiplexes the network side outputs of the signal bypass circuit and the broadband signal bypass circuit and outputs the multiplexed signal to the network, and controls the baseband signal bypass circuit and the broadband signal bypass circuit by a bypass control signal from the terminal. A bypass control circuit, a third separation circuit for separating a signal from the node into a baseband signal and a broadband signal, and a baseband signal from the third separation circuit for conversion into data And a baseband signal processing circuit for converting data to a baseband signal, and receiving a broadband signal from the third separation circuit and converting it to data or converting data to a broadband signal Broadband signal processing circuit and the base van A data processing circuit for exchanging data with another communication device via the signal processing circuit and the broadband signal processing circuit; and a third multiplexing circuit for multiplexing outputs of the baseband signal processing circuit and the broadband signal processing circuit. , A terminal comprising a bypass drive circuit that outputs a bypass control signal under the control of the data processing circuit, so that the baseband signal is time-division multiplexed and at the same time the baseband signal and the broadband signal are frequency-multiplexed. As a result, a large transmission capacity can be secured by the multiplexed broadband signal, and at the same time, a continuous signal or a broadband signal can be transmitted.

[Brief description of drawings]

FIG. 1 is a block diagram of a communication device in the first embodiment of the present invention, FIG. 2 is a connection diagram between communication devices in the first embodiment, and FIG. 3 is a communication device in the application of the first embodiment. 4 is a connection diagram between communication devices in the application of the first embodiment, and FIG. 5 is a block diagram of a conventional communication device. 1 ... Separation circuit, 2 ... Baseband signal bypass circuit, 3 ... Broadband signal bypass circuit, 4 ... Multiplexing circuit, 5 ... Separation circuit, 6 ... Baseband signal processing circuit, 7 ... Broadband signal processing Circuit, 8 ... Data processing circuit, 9 ... Multiplex circuit, 10 ... Bypass drive circuit, 11 ... Bypass control circuit, 12 ... Separation circuit, 13 ...
Multiplexing circuit, 14 ... Node, 15 ... Terminal, 101 ... Baseband signal bypass circuit, 102 ... Baseband signal processing circuit, 103 ... Data processing circuit, 104 ... Bypass drive circuit, 105 ... Bypass control Circuit, 106 ... Node, 107
...... Terminal.

Claims (1)

[Claims] 1. A communication device comprises a node and a terminal, wherein the node separates a signal from a network into a baseband signal and a broadband signal, and a baseband separated by the first separation circuit. A baseband signal bypass circuit for switching between outputting the signal to the terminal side or bypassing the terminal and outputting to the network side; and outputting the broadband signal separated by the first separation circuit to the terminal side or bypassing the terminal. A broadband signal bypass circuit that switches between outputting to the network side, a first multiplexing circuit that multiplexes the output of the baseband signal bypass circuit and the terminal side of the broadband signal bypass circuit, and outputs the multiplexed signal to the terminal; A second separation circuit for separating the generated signal into a baseband signal and a broadband signal, A second multiplexing circuit that multiplexes the network side outputs of the baseband signal bypass circuit and the broadband signal bypass circuit and outputs to the network, and the baseband signal bypass circuit and the broadband signal bypass by a bypass control signal from a terminal. It consists of a bypass control circuit that controls the circuit,
Also, the terminal includes a third separation circuit that separates a signal from the node into a baseband signal and a broadband signal, and the third separation circuit.
A baseband signal processing circuit for receiving a baseband signal from the separation circuit and converting it to data or converting data and converting it to a baseband signal; and a broadband signal from the third separation circuit. Broadband signal processing circuit for converting data into data or converting data into a broadband signal, and data processing for exchanging data with other communication devices via the verse band signal processing circuit and the broadband signal processing circuit A circuit, a third multiplexing circuit that multiplexes the outputs of the baseband signal processing circuit and the broadband signal processing circuit and outputs the multiplexed signal to a node, and a bypass drive circuit that outputs a bypass control signal under the control of the data processing circuit. A communication device configured.