JPS5831632A - Data transmission line - Google Patents

Abstract

PURPOSE:To uniform transmission quality and to save devices on a transmission line, by connecting communication devices at the intermediate part alternately to the transmission line in the order of outward and return lines in accordance with the order of cars to form the transmission line of loop shape. CONSTITUTION:An optical signal transmitted from an electrooptic converter 1b in a communication device 11 at the head car to an outward transmission line 4 passes through a coupling plug 21 and the No.2 car and is inputted to a photoelectric converter 1a of the device 11 of the No.3 car via a coupling plug 22 and converted into an electric signal. This electric signal is converted into an optical signal again with amplification at the converter 1b and transmitted to the transmission line 4. The signal is transmitted to succeeding cars at each odd number of cars sequentially. The optical signal with photoamplification at a converter 1b of a succeeding car is transmitted to a return transmission line 3. The optical signal transmitted to the line 3 is transmitted to even number cars at the preceding cars, where the optical signal coming from the line 3 is photoelectrically and electrooptically converted the same as the case on the outward line and transmitted to the preceding cars.

Description

[Detailed description of the invention] The zero train relates to railway wheel throats (data transmission when vehicles are arranged in a row and data is transmitted between seven trains), and the train is used as a transmission path. Significant effects can be expected when using optical Zeiper cables. Conventionally, data transmission lines between cables were forced to run in parallel with high-voltage and high-current cables, and were susceptible to conduction disturbances. The data error rate is higher than that of terrestrial transmission lines.In recent years, optical fiber cables, which are free from interference from other sources and can transmit data at high speeds, have become popular. It is being adopted as a road.

However, optical fiber transmission lines that use optical signals are
A transmission line Cζ ratio connector that uses electrical signals.

Attenuation loss in optical switches, optical multiplexers, and optical demultiplexers is large.

When optical fiber transmission lines are used in railway wheels.

Because the nature of rolling stock is such that the connection and disconnection of train formations is a nuisance, cables that cross between single points are called post-connection; since connectors are used, a large number of connectors are placed on the transmission path, and the optical signal is attenuated there. There will be a loss. The longer the network is, the more the transmission quality deteriorates due to attenuation loss, and in extreme cases, transmission may become impossible. In order to prevent such problems, 1. Normally, light amplification is applied to the vehicle counting system*.

Figure 1 is a four-dimensional diagram showing a conventional data transmission path using optical Zeiper cables in railway vehicles.

1 and 1' are overconfidence devices, la is an optical-to-electrical converter that converts an optical signal into an electrical signal, and lb is an electrical-to-optical converter that converts an electrical signal to an optical signal. (21 to 2n) are connecting plugs, 3 is a return transmission line, 4 is an outbound transmission line, 5 is an optical multiplexer, and 6 is a multiplexer. As shown in Figure 1, there is an electrical connection in the communication device l of the leading car. - The optical signal sent from the optical converter 111 to the outgoing transmission line 4 is transmitted to the second car via the connection @21. Optical demultiplexing II in car 2
The optical signal multiplied by 6 is branched toward the snow. One of the two-way branched optical signals is an optical signal in the communication device l of the second car.
The signal is guided to an electrical converter 1m, where it is converted into an electrical signal and information is transmitted.

The other one reaches No. 3 Army via the connecting plug 22 between No. 2 and No. 3 cars. Similarly to the 2nd vehicle, the 3rd Army also used Optical Separation II6.
The optical signal arriving at the branch is split into two directions.

FIG. 2 shows the optical signal level of each part in FIG. 1, and the optical signal level 11. Connecting stopper (!1
~2S) and the optical demultiplexer 116, it decreases sequentially due to its attenuation loss.
) and the attenuation loss of the optical demultiplexer 6 are improved, and highly sensitive optical-to-electrical conversion becomes possible.

In long vehicles, it is necessary to perform light amplification every few devices.

It can be seen from FIG. 2 that reception is no longer possible.

Further, the reception level of the optical signal by the communication device in each vehicle is different. This is a cause of hindering the standardization of communication devices.

Figure 1 shows an example of optical signal amplification in the 4th Army.The 4th Army does not use the optical demultiplexer 6, and the 4th Army connects the
23 is directly input to the optical-to-electrical converter 11 of the communication device 1', where it is converted into an electrical signal, and the cough electrical signal is converted back into an optical signal by the electrical-to-optical converter tb. Then, it is sent to the outbound transmission line 4 and transmitted to the 5th Army and beyond. During electro-optic conversion of the electrical signal, the optical signal is amplified and restored to the level of the optical signal sent out by the leading car. However, the amplified optical signal also needs to be similarly amplified several times later.

A communication device II such as the 4th Army equipped with an optical amplification function requires 1 m of optical-to-electrical converters and twice as many electric-to-optical converters 111 as compared to other communication devices I without an optical amplification function. The present invention has been made in view of the above-mentioned points,
The present invention will be explained below based on the drawings of the embodiments.

FIG. 3 shows an example of the present invention, which has a configuration of so-called loop two-way communication, but the principle is exactly the same even if it is configured for single-way communication.

In the 3rd WA, the electricity in the communication device 11 of the lead car
The optical signal sent from the optical converter 11 to the outgoing transmission line 4 is
The signal passes through the connecting plug 21 and the second car, and is inputted to the optical-to-electrical converter 11ζ of the communication device 11 of the third army via the connecting officer Goyi, where it is converted into an electrical signal. The electric signal is converted into an optically amplified signal again by the electric-optical converter 1bK, and sent to the outgoing transmission line 4. The optical signal sent to the outgoing transmission line 4 from the electrical-to-optical converter It) in the communication equipment 11 of the 3rd Army is
Passing through Consolidation @28 and 4th Army, via Consolidation 1 & za to reach 5th Army.

The 5th Army uses the exact same method as the 3rd Army to perform optical-to-electrical conversion and electrical-to-optical conversion with optical amplification.

After that, use the same method for each m-th odd numbered car to reach the tail car.

In the trailing car, an optical signal that has arrived from the preceding even-numbered car via the outgoing transmission line 4 is input to the optical-to-electrical conversion @la of the communication device 11 to obtain an electrical signal. However, in the case shown in Figure 3, the vehicle in front of the rear car is an odd-numbered car (rear - 1st army), so the optical signal from the electric-to-optical converter ill of the rear - 1st army connects @2n. The tail is simply entered via.

The electrical signal from the optical-to-electrical converter l& of the tail vehicle is optically amplified by the electrical-to-optical converter 1k and sent to the return transmission line 3 as an optical signal. Electrical-optical converter 1m+ of communication device 11 of rear vehicle
The optical signal sent to the return transmission line 3 passes through the connecting plug 2n, and if the vehicle immediately before the tail car is an odd number car, that odd number car (rear car No. 1 in Figure 3), and the connection @2111-1. Then, the even-numbered position W closest to the rear vehicle (in Figure 3, the rear -
The signal is input to the optical-to-electrical converter 11 of the communication device 11 of the second car) and converted into an electrical signal. The cough electrical signal is converted into an optical signal that is optically amplified again by the electro-optical converter 11,
The signal is sent to the return transmission line 3.

The optical signal sent to the return transmission line 3 from the electro-optical converter It) of the communication device 11 of the even-numbered car on the rear side (rear car - car No. 2) is transmitted to the connection@2 and the odd-numbered car on the leading car side (car S). It passes through and is sent to the even-numbered car (car No. 2) on the leading car side.

For each even-numbered car, the optical signal arriving from the return transmission path 3 on the rear side is converted into light-to-electricity and electricity-to-photocoal and is delivered to the leading car in the same way as the second car (even-numbered car).

FIG. 4 shows the optical signal level of each part in FIG. 3.

In FIG. 4, the level of the optical signal gradually decreases each time it passes through a coupling ring due to attenuation loss, as in the case of FIG. 2. However, the reception level of the optical signal of each communication device 11 is exactly the same except for the 2- of the leading car and the tail car (rear car No. 1 depending on the train configuration), and the attenuation loss error of each connector. .

When installing a transmission line for communication equipment arranged in a row like a railway vehicle, the communication equipment of the odd numbered cars are connected sequentially from the head of the train like one fIΦ. Adopting a loop-shaped transmission line in which the communication devices of even-numbered cars are connected sequentially and the communication devices of the leading car are connected will be useful, such as equalizing transmission quality, eliminating equipment on the transmission path, and standardizing communication devices. Therefore, the effects of the present invention are extremely large.

[Brief explanation of the drawing]

Figure 1 is a block diagram of a data transmission path using an optical fiber in a conventional railway vehicle, Figure 2 is a diagram showing the optical signal levels of each part in Figure 1, and Figure 3 is a diagram of data transmission according to this invention. Figure 4 is a diagram of an example of implementing a loop-type unidirectional communication optical 7-AIPA transmission line in a railway vehicle. FIG. 2 is a diagram showing the level of an optical signal at each part in @l. 1.1', 11... Communication device, la...
・Optical-to-electrical converter, 1m... Electrical-to-optical converter, 2 to 4n... Connector, 3... Return transmission line, 4... Sag transmission line, S... optical multiplexer @, S... optical demultiplexer. Atsushi Doi, company-wide representative of Toyo Denki Manufacturing Co., Ltd.

Claims (1)

[Claims] In multiple overconfident transmission lines arranged in a row,
The electric transmission line and the return transmission line are connected at the front ** and rear of the column to form a loop-shaped transmission line, and the intermediate overconfidence devices excluding the first 111 self and the rear overconfidence devices are connected to the ** of the column. *S
According to C, yli of 1st route/return route or return route/electric route
A data transmission path that is caused by the fact that ICs are connected alternately to transmission path E.