CN2874932Y

CN2874932Y - Bus type optical fiber node machine

Info

Publication number: CN2874932Y
Application number: CNU2005200995834U
Authority: CN
Inventors: 周杰
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-12-22
Filing date: 2005-12-22
Publication date: 2007-02-28
Anticipated expiration: 2015-12-22

Abstract

A bus type optical fiber node comprises a casing (1), an interface (2), a level switch circuit board (3), light transmitting-receiving modules (4-1 and 4-2), transmission interfaces (TX2 & TX3), receiving interfaces (RX2 & RX3) optical fiber demultiplexers (5-1, 5-2, 5-3 and 5-4), wherein the optical fiber demultiplexer (5-1, 5-2, 5-3 and 5-4) is communicated with the transmission interfaces (TX2 & TX3), receiving interfaces (RX2 & RX3). The utility model overcomes the shortcomings of the optical fiber node in the prior art, including easiness to be delayed and easiness of bus to be broken up, does not effect the reliability and real-time of the communication with the advantages of the continuous bus transmission.

Description

Bus type optical fiber node machine

Technical field

The utility model relates to a kind of bus type optical fiber node machine.It is mainly used in realizes the modulation and demodulation of RS-232/485/422 data-signal to optical fiber, and can form point-to-point and the bus-type fiber optic network.

Background technology

Existing Fiber Node machine (as shown in Figure 1), generally be to send and Optical Receivers is divided into the two-way fiber-optic signal with one road fiber-optic signal by level shifting circuit plate and light, ratio was generally 60%: 40% along separate routes, also other forms of distribution can be arranged, as 50%: 50%.It is to convert the electrical signal to light signal that level shifting circuit plate wherein mainly acts on, the light of A channel and B passage sends and Optical Receivers is used to realize light to electricity and the electric demodulation that is modulated to light, and is connected external cable with light transmission interface TX on the B passage with receiving interface of optical RX by A channel.

The course of work of existing Fiber Node machine in Network Transmission is: the RS-232/485/422 signal of control centre's computer is modulated on the optical fiber by the TX light transmit port of control centre's existing fiber node machine A channel, arrives the RX end of the A channel of 1# slave unit Fiber Node machine then.The RX end of the A channel of 1# slave unit is demodulated to the signal of telecommunication with light signal, one the tunnel gives the field apparatus that links to each other with the RS-232/485/422 electrical signal ports of 1# slave unit, the TX that the B passage of 1# slave unit is given on another road holds the light transmit port to be modulated to the RX end of the A channel that passes to the 2# slave unit on the optical fiber under the continuation, the RX end of the A channel of 2# slave unit is demodulated to the signal of telecommunication with light signal, one the tunnel gives the field apparatus that links to each other with the RS-232/485/422 electrical signal ports of 2# slave unit, another road give the 2# slave unit the B passage TX end light transmit port be modulated to the A channel that continues to pass to down the 3# slave unit on the optical fiber the RX end; And the like up to signal arrive the fiber buss network last field apparatus (4#, 5# ... N#) (as shown in Figure 2).Vice-versa can realize field apparatus (4#, 5# ... N#) signal arrives control centre, thereby realizes the Optical Fiber Transmission of RS-232/485/422 bus.Its course of work is actually based on light changes electricity, and electricity changes optical mode, and this pattern has following drawback: 1. signal changes electricity from light, and electricity changes light more then, so makes signal very big from sending the time-delay that arrives the destination.Particularly on fiber buss, there is this time-delay in a lot of the contacts will badly influence the reliability and the time performance of communication.In case 2. bigger shortcoming is that any one contact breaks down on the bus, when particularly having a power failure, the light transmission of this contact and Optical Receivers and inner level shifting circuit plate can't be worked, and light changes electricity, and electricity changes light can't be realized.Begin to the last from this contact this moment, and the data of a contact can't pass to control centre.Be that bus is interrupted, whole bus network paralyses.

Summary of the invention

The purpose of this utility model is to overcome the weak point of above-mentioned existing fiber node machine, and a kind of bus type optical fiber node machine is provided.When it uses, in case any one contact breaks down on the bus, when particularly having a power failure, the affected just transmission of these contact data this moment.Bus is not interrupted, and signal still can continue to pass to down the equipment of back, and the data of the equipment of back also can upload to control centre.

The purpose of this utility model reaches by following measure: bus type optical fiber node machine, and it comprises housing 1, interface 2, level shifting circuit plate 3, optical transceiver module 4-1,4-2; Described level shifting circuit plate 3 and interface 2 UNICOMs, have transmission interface TX1 and receiving interface RX1 on described optical transceiver module 4-1, the 4-2, described optical transceiver module 4-1,4-2 respectively with level shifting circuit plate 3 UNICOMs, and optical transceiver module 4-1 and the mutual UNICOM of optical transceiver module 4-2; It is characterized in that it also comprises transmission interface TX2, receiving interface RX2 and transmission interface TX3, receiving interface RX3, four optical fiber splitter 5-1,5-2,5-3,5-4, the end of described optical fiber splitter 5-1 is by the transmission interface TX1 UNICOM of optical fiber and optical transceiver module 4-1, the other end is by optical fiber and transmission interface TX2 UNICOM, and by optical fiber and optical fiber splitter 5-4 UNICOM; The end of described optical fiber splitter 5-2 is by the transmission interface RX1 UNICOM of optical fiber and optical transceiver module 4-1, and the other end is by optical fiber and transmission interface RX2 UNICOM, and by optical fiber and optical fiber splitter 5-3 UNICOM; The end of described optical fiber splitter 5-3 is by the transmission interface TX1 UNICOM of optical fiber and optical transceiver module 4-2, and the other end is by optical fiber and transmission interface TX3 UNICOM; The end of described optical fiber splitter 5-4 is by the transmission interface RX1 UNICOM of optical fiber and optical transceiver module 4-2, and the other end is by optical fiber and transmission interface RX3 UNICOM.

In technique scheme, described interface 2 is RS-232 or RS-485 or RS-422 interface.

The utility model bus type optical fiber node machine has following advantage: 1. signal needn't change electricity from light, and electricity changes light again and hands down then, and so signal can be ignored from sending the time-delay that arrives the destination.Have on fiber buss in a plurality of contacts, this time-delay also will can not have influence on the reliability and the time performance of communication again.In case 2. any one contact breaks down on the bus, when particularly having a power failure, the light transmission of this contact and Optical Receivers and level shifting circuit plate can't be worked, and light changes electricity, and electricity changes light can't be realized.The affected just transmission of the data of this contact this moment.But because optical fiber splitter is optical passive component (not needing power supply during work), the fiber-optic signal that send over from a last contact this moment is directly connected to the receiving terminal of next contact by optical branching device.Thereby make bus not be interrupted.Signal can continue to pass to down the equipment of back, and in like manner, the data of the equipment of back also can upload to control centre.

Description of drawings

Fig. 1 is the structural representation of existing Fiber Node machine;

Schematic diagram when Fig. 2 is used for Network Transmission for existing Fiber Node machine;

Fig. 3 is the structural representation of the utility model bus type optical fiber node machine;

Schematic diagram when Fig. 4 is used for Network Transmission for the utility model bus type optical fiber node machine.

Embodiment

Describe the performance of the utility model bus type optical fiber node machine in detail below in conjunction with accompanying drawing, the advantage of the utility model bus type optical fiber node machine will become clear and be understood easily like this, arrow among the figure (as ←, →, ↑, ↓) direction of indication is the direction of signal transmission.

1 is housing among the figure, and 2 is interface, and 3 is the level shifting circuit plate, and 4-1,4-2 are optical transceiver module, and 5-1,5-2,5-3,5-4 are optical fiber splitter, and TX, TX1, TX2, TX3 are transmission interface, and RX, RX1, RX2, RX3 are receiving interface.

The structure of Fig. 1, Fig. 2 and the correlation circumstance that is used for Network Transmission are partly described in detail in background technology in the accompanying drawing, do not repeat them here.

Consult Fig. 3 as can be known: the utility model bus type optical fiber node machine, it comprises housing 1, interface 2, level shifting circuit plate 3, optical transceiver module 4-1,4-2; Described level shifting circuit plate 3 and interface 2 UNICOMs, have transmission interface TX1 and receiving interface RX1 on described optical transceiver module 4-1, the 4-2, described optical transceiver module 4-1,4-2 respectively with level shifting circuit plate 3 UNICOMs, and optical transceiver module 4-1 and the mutual UNICOM of optical transceiver module 4-2; It is characterized in that it also comprises transmission interface TX2, receiving interface RX2 and transmission interface TX3, receiving interface RX3, four optical fiber splitter 5-1,5-2,5-3,5-4, the end of described optical fiber splitter 5-1 is by the transmission interface TX1 UNICOM of optical fiber and optical transceiver module 4-1, the other end is by optical fiber and transmission interface TX2 UNICOM, and by optical fiber and optical fiber splitter 5-4 UNICOM; The end of described optical fiber splitter 5-2 is by the transmission interface RX1 UNICOM of optical fiber and optical transceiver module 4-1, and the other end is by optical fiber and transmission interface RX2 UNICOM, and by optical fiber and optical fiber splitter 5-3 UNICOM; The end of described optical fiber splitter 5-3 is by the transmission interface TX1 UNICOM of optical fiber and optical transceiver module 4-2, and the other end is by optical fiber and transmission interface TX3 UNICOM; The end of described optical fiber splitter 5-4 is by the transmission interface RX1 UNICOM of optical fiber and optical transceiver module 4-2, and the other end is by optical fiber and transmission interface RX3 UNICOM; Described interface 2 is RS-232 or RS-485 or RS-422 interface.

Consult Fig. 4 as can be known: the course of work of the utility model bus type optical fiber node machine in Network Transmission is: the optical transceiver module TX1 light transmit port of the RS-232/485/422 signal of control centre's computer by the A channel of control centre's bus type optical fiber node machine is modulated into light signal and enters one road light and arrive on the optical fiber through optical fiber splitter, arrives the RX1 end optical fiber optical branching device of the A channel of 1# slave unit then.This moment, the optical fiber optical branching device was divided into two-way with light signal, one the tunnel give the 1# slave unit A channel RX2 end light signal be demodulated to the signal of telecommunication give the field apparatus that links to each other with the RS-232/485/422 electrical signal ports of 1# slave unit, another road give the 1# slave unit the B passage the light signal of TX3 end optical fiber splitter and the optical transceiver module TX end light transmit port of the B passage of 1# slave unit be modulated to after merging the A channel that continues to pass to down the 2# slave unit on the optical fiber the optical fiber splitter held of RX2, this moment, optical branching device was divided into two-way with light signal, one the tunnel give the 2# slave unit A channel RX end light signal be demodulated to the signal of telecommunication give the field apparatus that links to each other with the RS-232/485/422 electrical signal ports of 2# slave unit, another road give the 2# slave unit the B passage TX1 end optical branching device and 2# slave unit the B passage the light signal of TX3 end light transmit port be modulated to after merging the A channel that passes to the 3# slave unit under continuing on the optical fiber the optical fiber splitter held of RX2.And the like arrive last field apparatus of fiber buss network up to signal; In like manner, the data of back equipment also can upload to control centre, thereby realize the Optical Fiber Transmission of RS-232/485/422 bus.

Claims

1, bus type optical fiber node machine, it comprises housing (1), interface (2), level shifting circuit plate (3), optical transceiver module (4-1,4-2); Described level shifting circuit plate (3) and interface (2) UNICOM, have transmission interface (TX1) on the described optical transceiver module (4-1,4-2) and reception meets (RX1), described optical transceiver module (4-1,4-2) respectively with level shifting circuit plate (3) UNICOM, and optical transceiver module (4-1) and optical transceiver module (4-2) UNICOM mutually; It is characterized in that it also comprises two pairs of transmission interfaces (TX2), receiving interface (RX2) and transmission interface (TX3), receiving interface (RX3), four optical fiber splitters (5-1,5-2,5-3,5-4), one end of described optical fiber splitter (5-1) is by transmission interface (TX1) UNICOM of optical fiber and optical transceiver module (4-1), the other end is by optical fiber and transmission interface (TX2) UNICOM, and by optical fiber and optical fiber splitter (5-4) UNICOM; One end of described optical fiber splitter (5-2) is by transmission interface (RX1) UNICOM of optical fiber and optical transceiver module (4-1), and the other end is by optical fiber and transmission interface (RX2) UNICOM, and by optical fiber and optical fiber splitter (5-3) UNICOM; One end of described optical fiber splitter (5-3) is by transmission interface (TX1) UNICOM of optical fiber and optical transceiver module (4-2), and the other end is by optical fiber and transmission interface (TX3) UNICOM; One end of described optical fiber splitter (5-4) is by transmission interface (RX1) UNICOM of optical fiber and optical transceiver module (4-2), and the other end is by optical fiber and transmission interface (RX3) UNICOM.

2, bus type optical fiber node machine according to claim 1 is characterized in that described interface (2) is RS-232 or RS-485 or RS-422 interface.