CN2381069Y

CN2381069Y - Light interface board with signal indication

Info

Publication number: CN2381069Y
Application number: CN99216908U
Authority: CN
Inventors: 王俊杰; 霍大伟
Original assignee: Shenzhen Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 1999-07-16
Filing date: 1999-07-16
Publication date: 2000-05-31
Anticipated expiration: 2009-07-16

Abstract

The utility model discloses a light interface board with signal indication, which at least comprises an optical module, a frame structure, an overhead processing module, a cross interface and a signal indication module, and the signal indication module is composed of a level conversion circuit, a drive circuit and an indication part. A detecting signal of an optical signal output by the optical module is connected with an input terminal of the level conversion circuit and connected with the drive circuit through the output terminal of the level conversion circuit, and the detecting signal drives the indication part to generate corresponding signal indication. The utility model can conveniently and intuitively judge whether optical signals are carried in an optical fiber correctly or not and determine that the optical fiber is inserted into any one of jacks of an optical interface board. The utility model has the advantages of simple structure, low cost and convenient and intuitive practical application.

Description

Optical Fiber Interface Board with signal indication

The utility model relates to technical field of optical fiber communication, is specifically related to a kind of Optical Fiber Interface Board device with signal indication in the optical transmission device.

Optical fiber communication is as one of main pillar of modern communications, because its huge bandwidth capacity, cheap relatively cost occupy leading position in the broadband connections field.Wherein, with the Optical Fiber Interface Board that optical fiber is connected, can finish the mutual conversion of the light signal and the signal of telecommunication, be the important component of optical fiber communication equipment.For transmission and the reception of finishing signal, generally constitute one group by two optical fiber: an optical fiber sends light signal, and another root optical fiber receiving optical signals.Under the usual condition, the length of optical fiber has tens kilometers even kilometer up to a hundred, judges which root optical fiber is to send signal, which root optical fiber is received signal, could distinguish after can only using special instrument (as light power meter) to measure, operate cumbersome, and very not directly perceived.

Given this, the purpose of this utility model just is to provide a kind of Optical Fiber Interface Board with signal indication, it has LOS signal indication (Loss of Signal light signal is lost), can judge by this whether correctly to be loaded with light signal in the optical fiber and to determine optical fiber should insert which jack of Optical Fiber Interface Board.

For achieving the above object, a kind of Optical Fiber Interface Board of the utility model with signal indication, at least include optical module, frame structure and spending process module and interface-crossover, this optical module has the jack that can connect optical fiber, it is characterized in that: described Optical Fiber Interface Board further comprises a signal indicating module, this signal indicating module is by level shifting circuit, drive circuit and indicating section are formed, wherein, the optical signal detecting signal of described optical module output is connected to the input of this level shifting circuit, output through level conversion connects drive circuit, drives described indicating section and makes corresponding signal indication.

According to technique scheme, described level shifting circuit is the PECL/TTL level shifting circuit, adopts integrated circuit (IC) chip SY100EL23 to finish realization, and drive circuit is realized by 74HCT244 series integrated circuit (IC) chip.

Above-mentioned indicating section can be light-emitting diode, and its negative terminal connects the output of 74HCT244, and anode meets VCC by a resistance.

This shows that the utility model is to add optical signal detecting circuit and indicator light on Optical Fiber Interface Board.Optical Fiber Interface Board with this indicating device, powering on, any optical fiber is inserted on the Optical Fiber Interface Board in the jack that is designated " reception ", if indicator light goes out with the bright state of rear indicator light maintenance, then show the light signal that is loaded with the other side's equipment on this root optical fiber, it should be inserted into this position; If indicator light is light yellow still, show that then this root optical fiber is used for sending a signal to method, apparatus, should be inserted on the Optical Fiber Interface Board in the jack that is designated " transmission ".According to the bright of indicator light or the state that goes out, just can very conveniently judge in the optical fiber whether correctly be loaded with light signal intuitively, and determine thus optical fiber should insert which jack of Optical Fiber Interface Board.

Simultaneously, the utility model is simple in structure, and is with low cost, and practical application is easy to be directly perceived.

Below in conjunction with drawings and the specific embodiments the utility model is further described in more detail.

Fig. 1 is a prior art Optical Fiber Interface Board block diagram.

Fig. 2 is the utility model Optical Fiber Interface Board block diagram.

Fig. 3 is the utility model signal indicating section embodiment circuit theory diagrams.

As seen from Figure 1, Optical Fiber Interface Board fundamental system of the prior art is made up of three big function blocks: optical module, frame structure and spending process module, interface-crossover.Referring to shown in Figure 2, the utility model ties up to increases the signal indicating module on the prior art Optical Fiber Interface Board basis, and this signal indicating module system is made up of level shifting circuit 2, drive circuit 3 and indicating section 4.Wherein, optical module 1 on the Optical Fiber Interface Board is realized the mutual conversion of the light signal and the signal of telecommunication, whether normal itself can provide the LOS signal, detect judgment task state usefulness for the CPU of subsequent conditioning circuit on the Optical Fiber Interface Board, has two jacks 11,12 that connect optical fiber on this optical module 1.The utility model is drawn the LOS signal that optical module 1 provides, and by level shifting circuit 2 and drive circuit 3, drives an indicating section 4, makes corresponding signal indication.

Referring to shown in Figure 3, the utility model one best enforcement in the circuit, above-mentioned optical module 1 is the 155M optical module that Hewlett-Packard Corporation produces for a model on the Optical Fiber Interface Board is the packaging of SDX1155, transmission jack signal on it be TD ,/TD, receive the jack signal and be RD ,/RD.The LOS signal SD of its output is the signal of PECL level, this SD signal is sent into the input of the PECL/TTL level conversion that realizes with the SY100EL23 of SYNERGY company, through the SD signal of PECL/TTL level conversion by Q1 output Transistor-Transistor Logic level, again through the 74HCT244 of signal chip for driving TI company, directly driving indicating section, is indicator light (using common light-emitting diode as indicator light in circuit) at this.

When there not being optical fiber to be inserted into " reception " jack of optical module 1, or optical fiber is not when being loaded with light signal, and LOS signal SD is a logic low, so indicator light D1 is bright; When the optical fiber that is loaded with signal was inserted into " reception " jack of optical module, LOS signal SD became logic high, and luminous indicating lamp D1 goes out.Whether by this, can judge the optical fiber that inserts jack very intuitively has which root of optical fiber of light signal and long Distance Transmission to be the transmission signal, and which root is a received signal.

In the foregoing description, the optical signal detecting signal SD of optical module 1 output is the PECL level standard, when adopting the optical module of other level standard, for example ECL, GTL etc., only need select corresponding level transferring chip for use, be converted into the TTL fiduciary level, can conveniently implement the present invention equally.Equally, indicating section of the present utility model can be done multiple variation, can be other luminous indication spare, or even sound indicator spare, only does corresponding variation at drive part.The above neither protection range of deviating from the utility model.

This LOS indicating circuit that adds on the Optical Fiber Interface Board of the present utility model, simple and reliable for structure, owing to only adopt general logic chip and light-emitting diode, so cost is very low.In the work progress, whether this circuit can have light signal in the detection fiber, and provides visual indication, and needn't use special optical signal detecting instrument to carry out complicated operations, for the equipment construction personnel provide very big convenience at the scene.After the normal operation of equipment, if optical fiber fractures or other fault causes there is not light signal in the optical fiber, this circuit also can provide indication at once, reminds the attendant to handle relevant fault.

Claims

1, a kind of Optical Fiber Interface Board with signal indication, at least include optical module, frame structure and spending process module and interface-crossover, this optical module has the jack that can connect optical fiber, it is characterized in that: described Optical Fiber Interface Board further comprises a signal indicating module, this signal indicating module is by level shifting circuit, drive circuit and indicating section are formed, wherein, the optical signal detecting signal of described optical module output is connected to the input of this level shifting circuit, output through level conversion connects drive circuit, drives described indicating section and makes corresponding signal indication.

2, the Optical Fiber Interface Board with signal indication according to claim 1, it is characterized in that: described level shifting circuit is the PECL/TTL level shifting circuit, adopt integrated circuit (IC) chip SY100EL23, described drive circuit is a 74HCT244 series integrated circuit (IC) chip, described indicating section is a light-emitting diode, its negative terminal connects the output of 74HCT244, and anode meets VCC by a resistance.

3, the Optical Fiber Interface Board with signal indication according to claim 1 is characterized in that: described indicating section is sound or light signal indication.