JP2003032283A - Line multiplexer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a line multiplexer for facilitating transmission to other high-speed lines originating from a high-speed line. SOLUTION: Multiple separation circuits 105 and 106 are connected mutually, thus enabling the transmission path of Giga-bit Ethernet (R) signal from separation circuits 103 and 104 in each multiplex separation circuit, to select a path for connecting to Giga-bit Ethernet lines 109 and 110, or a path for connecting to multiplex circuits 102 and 101, within other demultiplexing circuits 106 and 105.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line multiplexer for time division multiplexing and demultiplexing between a plurality of Gigabit Ethernet (registered trademark) lines and a high speed line, and more particularly, from a high speed line to another high speed line. The present invention relates to a line multiplexer that facilitates transmission of data.

[0002]

2. Description of the Related Art In recent years, the Internet has explosively spread, and companies are rapidly digitizing data and transactions. Therefore, high-speed long-distance communication using optical fibers is indispensable. However, since the current optical fiber network is limited, various signal multiplexing techniques are used to increase the capacity of the communication network. Among these, the time division multiplex system is the oldest one that has been used today. In this method, a plurality of low speed lines are periodically allocated to a high speed line for a certain period of time.

The demultiplexing circuit multiplexes Gigabit Ethernet data (signals) from a plurality of Gigabit Ethernet lines to transmit data (multiplexed signal) to a high speed line, and receives multiple signals from a high speed line to receive a plurality of signals. It is a circuit that separates into a Gigabit Ethernet signal to be sent to a Gigabit Ethernet line.

The demultiplexing circuit is a parallel-serial conversion circuit that multiplexes a Gigabit Ethernet signal from a plurality of Gigabit Ethernet lines and converts it into a high-speed multiplexed signal, and a time-division-multiplexed high-speed multiplexed signal into a plurality of Gigabit Ethernet data. It is composed of a serial-parallel conversion circuit for conversion.

FIG. 8 shows the internal structure of a conventional line demultiplexing device having a plurality of high-speed line interfaces and a demultiplexing circuit. The line demultiplexing device 900 is a multiplexing circuit for multiplexing a plurality of Gigabit Ethernet signals into a high speed multiplexed signal (left
(Right) 901 and 902, and a separation circuit (left / right) 90 for separating a high-speed multiplexed signal into a plurality of Gigabit Ethernet signals
3, 904, a demultiplexing circuit (left) 905 having a demultiplexing circuit (left) 901 and a demultiplexing circuit (left) 903, and a demultiplexing circuit (right) having a demultiplexing circuit (right) 902 and a demultiplexing circuit (right) 904. 906 and a demultiplexing circuit (left / right) 90 for converting an optical signal from a high-speed line into an electric signal
Optical transceivers for high-speed signals (left / right) 907 and 908 for converting the electrical signals multiplexed by 5, 906 into optical signals
And optical signals from the Gigabit Ethernet line are converted into electrical signals and demultiplexing circuits (left / right) 905, 9
Optical transceiver for Gigabit Ethernet (left / right) 90 for converting electrical signals separated by 06 into optical signals
9, 909, 910, 910, high-speed line input / output ports (left / right) 911, 912, and Gigabit Ethernet input / output ports (left / right) 913, 913, 914,
914, high-speed lines (left / right) 915 and 916, and Gigabit Ethernet lines (left / right) 917 and 918.

In the line demultiplexer 900 of FIG. 8, for example, when an optical signal from the high speed line (left) 915 is input to the high speed line input / output port (left) 911, this optical signal is sent to the high speed signal optical transceiver. (Left) Received at 907 and converted to an electrical signal. The converted electric signal is separated into a plurality of Gigabit Ethernet signals by a separation circuit (left) 903 in the demultiplexing circuit (left) 905. Next, a plurality of Gigabit Ethernet signals are converted into optical signals by Gigabit Ethernet optical transceivers (left) 909 and 909, and then Gigabit Ethernet input / output ports (left)
It is output from 913 and 913.

Here, among the signals output from the plurality of Gigabit Ethernet input / output ports (left) 913, 913, a high-speed line (right) 9 different from the high-speed line (left) 915.
If there is a signal to be transmitted to 16, the cable is returned from the Gigabit Ethernet input / output port (left) 913 to the Gigabit Ethernet input / output port (right) 914 using a cable. The optical signal input to the I / O port for Gigabit Ethernet (right) 914 by folding back is the optical transceiver for Gigabit Ethernet (right).
The signal is converted into an electric signal again by 910, and the electric signal is multiplexed in the demultiplexing circuit (right) 906 (right) 902
Is multiplexed with other signals. The multiplexed electrical signal is converted into an optical signal by an optical transceiver for high-speed signal (right) 908, and the optical signal is input / output port for high-speed line (right) 912.
From the high speed line (right) 916.

FIG. 7 shows a plurality of conventional line separation devices 800.
2 shows a configuration of a physical opposite network in which the two are mutually connected by a high speed line 801 (thick line). The transmission line indicated by a thin line is a Gigabit Ethernet line connected to each line separation device 800. As shown in the figure, the high-speed line 801 is also used for connecting two or more line separation devices 800 separated from each other.

[0009]

In the prior art, a plurality of line separation devices 800 are connected in a ring shape and a bus form by using a high speed line 801, and the line separation devices 8 are separated by two or more.
In the case of connecting 00s together, as described with reference to FIG. 8, a large number of ports must be folded back with an optical fiber (a cable such as a twisted pair in the case of an electric signal). When there are many line separation devices 800 on the network, in order to relay from one line separation device 800 to another line separation device 800, a large number of ports must be folded back, and the ports are installed. There is a problem that the area around the existing front panel becomes complicated with cables, making it difficult to handle.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to provide a line multiplexer which facilitates transmission from a high speed line to another high speed line.

[0011]

To achieve the above object, the present invention provides a multiplexing circuit for time division multiplexing to transmit a Gigabit Ethernet signal from a plurality of Gigabit Ethernet lines to a high speed line and a time division from the high speed line. In a line multiplexer equipped with a demultiplexing circuit for separating multiple signals into multiple Gigabit Ethernet lines, and a demultiplexing circuit that separates the signals into Gigabit Ethernet signals, connect the demultiplexing circuits to each other. Thus, the transmission path of the Gigabit Ethernet signal from the demultiplexing circuit in each demultiplexing circuit can be selected to be a path connected to the Gigabit Ethernet line or a path connected to a multiplex circuit in another demultiplexing circuit.

Switch means for selecting the transmission path may be provided.

An optical transceiver for converting the Gigabit Ethernet signal into an optical signal and outputting it to the Gigabit Ethernet line may be detachably configured.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, in the line multiplexer 100 according to the present invention, a Gigabit Ethernet signal from a plurality of Gigabit Ethernet lines (left / right) 117, 118 is sent to a high-speed line (left / right) 115, 116. Circuits (left / right) 101, 102 for time division multiplexing to be transmitted to
And time-division multiplexed signals from high speed lines (left / right) 115 and 116 to multiple Gigabit Ethernet lines (left / right) 1
Multiplexing demultiplexing circuits (left / right) 105 and 106 including demultiplexing circuits (left / right) 103 and 104 for demultiplexing into Gigabit Ethernet signals to be transmitted to 17, 118, and a plurality of high-speed lines (left / right) 115, 116. In the line multiplexers provided for each, the demultiplexing circuit (left / right) 10
By connecting 5 and 106 to each other, demultiplexing circuits (left and right) in each demultiplexing circuit 105 and 106 (left and right)
The transmission path of the Gigabit Ethernet signal from 103, 104 is connected to the Gigabit Ethernet line or the path connected to the multiplex circuits (right / left) 102, 101 in the other demultiplexing circuits (right / left) 106, 105. It is configured to be selectable.

High-speed signal optical transceiver (left / right) 10
Numerals 7 and 108 convert the optical signals from the high speed lines (left and right) 115 and 116 into electric signals and also convert the time-division multiplexed electric signals into optical signals to express the high speed lines (left and right) 11
5 and 116. Optical transceiver for Gigabit Ethernet (left / right) 109, 109, 11
0 is a demultiplexing circuit (left / right) 105 for converting an optical signal from the Gigabit Ethernet line into an electric signal,
The electrical signal separated by 106 is converted into an optical signal. 111 and 112 are high-speed line input / output ports (left /
Right), 113 and 114 are input / output ports (left / right) for Gigabit Ethernet.

FIG. 2 shows the internal structure of the multiplex circuit. The multiplexing circuit 500 is a parallel-serial conversion circuit 50 that converts the multi-bit low speed signal 501 into a serial high speed signal 502.
Equipped with 3.

FIG. 3 shows the internal structure of the separation circuit. The separation circuit 600 includes a serial-parallel conversion circuit 603 that converts a serial signal 601 from a high speed line into a multi-bit low speed signal 602. In general, the multiplexing circuit 500 and the demultiplexing circuit 600 are often combined and used as a demultiplexing circuit.

Next, the operation of the line multiplexer of FIG. 1 will be described.

In the line multiplexer 100, for example, when an optical signal from the high speed line (left) 115 is input to the high speed line input / output port (left) 111, this optical signal is sent to the high speed signal optical transceiver (left). The signal is received at 107 and converted into an electric signal. The converted electrical signal is the demultiplexing circuit (left)
A separation circuit (left) 103 in 105 separates the signals into a plurality of Gigabit Ethernet signals.

Next, of the separated Gigabit Ethernet signals, a Gigabit Ethernet line (left) 11
The signal to be transmitted to G.7 is transmitted to the optical transceiver for Gigabit Ethernet (left) 109, converted into an optical signal, and then output from the I / O port for Gigabit Ethernet (left) 113. 115
A signal to be transmitted to another high-speed line (right) 116 different from that is transmitted to the multiplexing circuit (right) 102 in the demultiplexing circuit (right) 106 as an electrical signal and multiplexed with other signals. The multiplexed electrical signal is converted into an optical signal by the high-speed signal optical transceiver (right) 108, and the optical signal is transferred from the high-speed line input / output port (right) 112 to the high-speed line (right) 11
6 is transmitted.

As described above, in the present invention, the demultiplexing circuits (left / right) 105 and 106 are connected to each other, whereby the path from the demultiplexing circuit (left) 103 to the demultiplexing circuit (right) 102 and the demultiplexing circuit. (Right) 104 to multiplex circuit (left) 1
A route to 01 is formed. Using these routes, it is possible to relay from a high-speed line to another high-speed line. Therefore, there is no cable to fold back between the ports on the Gigabit Ethernet line side, the periphery of the front panel is simplified, and the labor for mounting the wrapping cable becomes unnecessary. Also, the signal relayed to another high-speed line is
Since the wasteful processing of converting into an optical signal and then converting into an electric signal is not performed, factors such as signal deterioration and delay are reduced.

Further, since the optical transceiver for Gigabit Ethernet is not used for the channel relayed to another high speed line, there is no inconvenience even if this part is removed. Therefore, by constructing the optical transceiver for Gigabit Ethernet in a detachable manner, it is possible to remove the optical transceiver when it is not needed or add it only when necessary.

Next, another embodiment of the present invention will be described with reference to FIG.

The line multiplexer 200 according to the present invention comprises a plurality of Gigabit Ethernet lines (left / right) 217, 21.
Gigabit Ethernet signal from 8 high speed line (left
Right) Multiplex circuits (left / right) 201 and 202 for time division multiplexing to transmit to 215 and 216 and high-speed lines (left / right) 2
A demultiplexing circuit (demultiplexing circuit) 203 and 204 for demultiplexing the time division multiplexed signals from 15 and 216 into Gigabit Ethernet signals for transmission to a plurality of Gigabit Ethernet lines (left and right) 217 and 218 (left and right) Left / right) 205, 206 to multiple high-speed lines (left / right) 21
In the line multiplexers respectively provided for Nos. 5 and 216, the demultiplexing circuits (left and right) 205 and 206 are connected to each other, so that each demultiplexing circuit (left and right) 20
The transmission path of the Gigabit Ethernet signal from the demultiplexing circuits (left / right) 203, 204 in 5, 206 is the path connected to the Gigabit Ethernet line or another demultiplexing circuit in the demultiplexing circuits (right / left) 206, 205 ( (Right / left) 20
2, a switch means 219 for selecting a transmission path is provided so that the path can be selected. The configuration other than the switch means 219 is the same as that of FIG. 1, and those having the same last two digits of the reference numerals are the same members.

In this line multiplexer 200, the gigabit Ethernet signal separated by the separation circuit (left) 203 of the demultiplexing circuit (left) 205 is input to the switch means 219 and transmitted by the switch means 219 to the gigabit Ethernet line. , Transmission to another high-speed line is selected. Other operations are the same as in FIG.

The switch means 219 can be realized by a hardware switch or a software switch. The hardware switch switches the electrical connection of the signal line. The software switch logically rewrites the destination of the signal.

Since the switching means 219 is provided, it is possible to easily select whether to transmit the signal from the high speed line to the Gigabit Ethernet line or another high speed line.

Next, a usage pattern of the line multiplexer of the present invention will be described. As shown in FIG. 5, a ring network can be configured by connecting a plurality of line multiplexers 700 to each other using a high-speed line 701. Here, in order to communicate between the line multiplexers 700 that are separated by two or more, the line multiplexer 7 sandwiched between the two is used.
At 00, a route from the high speed line to another high speed line is selected as described with reference to FIGS.

The appearance of the front panel of the line multiplexer at this time will be compared with that of the prior art with reference to FIG. In the conventional technology, as shown in FIG. 6A, in order to transfer a high-speed signal from the device 400 on the left side to the device 400 on the right side, it is necessary to connect the ports of the device 400 in the center with a folded cable. It was In the present invention, as shown in FIG. 6 (b), by setting the switching in the central line multiplexer 400, a high speed signal from the left line multiplexer 400 can be transmitted to the right without adding cables. Can be transferred to the line multiplexer 400.

In the above embodiment, the line multiplexer in which two high speed lines are connected has been described, but the number of high speed lines and the number of low speed lines are not limited to this. Also,
Although an optical signal is transmitted on the line, it goes without saying that it may be an electric signal.

[0032]

The present invention exhibits the following excellent effects.

(1) A cable for folding back between the ports on the Gigabit Ethernet line side is eliminated, the periphery of the front panel is simplified, and the labor for mounting the cable for folding back is not required.

[Brief description of drawings]

FIG. 1 is an internal configuration diagram of a line multiplexer according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a multiplexing circuit used in the line multiplexer of the present invention.

FIG. 3 is a configuration diagram of a separation circuit used in the line multiplexer of the present invention.

FIG. 4 is an internal configuration diagram of a line multiplexer according to an embodiment of the present invention.

FIG. 5 is a configuration diagram of a ring network using the line multiplexer of the present invention.

6A is a wiring diagram of a front panel of a device according to the related art, and FIG. 6B is a wiring diagram of a front panel of a circuit multiplexer according to the present invention.

FIG. 7 is a configuration diagram of an opposite network using a conventional line separation device.

FIG. 8 is an internal configuration diagram of a line separation device according to a conventional technique.

[Explanation of symbols]

100 circuit multiplexer 101 multiplex circuit (left) 102 multiplex circuit (right) 103 separation circuit (left) 104 separation circuit (right) 105 multiplex separation circuit (left) 106 multiplex separation circuit (right) 107 optical transceiver for high-speed signals (left) ) 108 High-speed signal optical transceiver (right) 109 Gigabit Ethernet optical transceiver (left) 110 Gigabit Ethernet optical transceiver (right) 115 High-speed line (left) 116 High-speed line (right) 117 Gigabit Ethernet line (left) 118 Gigabit Ethernet Line (right) 219 Switch means

Claims (3)

[Claims] 1. A multiplexing circuit for time division multiplexing to transmit a Gigabit Ethernet signal from a plurality of Gigabit Ethernet lines to a high speed line, and a Gigabit Ethernet signal for transmitting a time division multiplexed signal from a high speed line to a plurality of Gigabit Ethernet lines. In a line multiplexer equipped with multiple demultiplexing circuits each consisting of a demultiplexing circuit for demultiplexing each of the multiple demultiplexing circuits, by connecting the demultiplexing circuits to each other, the Gigabit Ethernet signals from the demultiplexing circuits in each demultiplexing circuit are connected. A line multiplexer, wherein the transmission path of is selectable between a path connected to a Gigabit Ethernet line and a path connected to a multiplexing circuit in another demultiplexing circuit. 2. The circuit multiplexer according to claim 1, further comprising switch means for selecting the transmission path. 3. The line multiplexer according to claim 1, wherein an optical transceiver that converts the Gigabit Ethernet signal into an optical signal and outputs the optical signal to a Gigabit Ethernet line is detachably configured.