CN2359704Y

CN2359704Y - No-screen double-twisted-line tester

Info

Publication number: CN2359704Y
Application number: CN 98249594
Authority: CN
Inventors: 边永盛
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-12-10
Filing date: 1998-12-10
Publication date: 2000-01-19
Anticipated expiration: 2008-12-10

Abstract

The utility model discloses a no screen double-twisted-ling tester, which comprises a transmitter and a receiver, wherein, the transmitter uses a plurality of single-pole double-throw switches, and the receiver uses eight paths of rectifying bridges which are composed of photoelectric couplers and diodes. The tester breaks through that the traditional communication cable tester relies on a cable screen layer and realize the test and the display of any connection mode of any line number (at least two lines) of eight lines in the no screen double twisted line. The utility model has the advantages that the testing power consumption can be saved, the utility model can use batteries for supplying the power and can be conveniently carried, and the utility model is suitable for the construction site.

Description

The unshielded twisted pair tester

The utility model relates to tester, relates in particular to the unshielded twisted pair tester.

To the test of double cut wire connectivity, be the substance that regulation must be measured among EIA/TIA-568A and the ISO/IEC-11801 in the buildings computational grid cable wiring manufacture.Domestic means of testing commonly used has three kinds at present: multimeter, simple and easy continuity testing instrument and network protocol testing instrument (claiming analyser again).

Multimeter method of testing efficient is low as can't to stand, and substantially need not in the practice of construction;

The basic functional principle of simple type continuity testing instrument is that an end adds positive inverse voltage respectively for four pairs of lines by four toggle switches, the other end shows polarity of voltage on every pair of line with four dichromatic LEDs, has one to open circuit and just show that two all have fault in a pair of line.The network protocol testing analytical equipment is very advanced instrument, its principle of work is to each line to be sent the step level signal one by one, its step response waveform that reflects of record analysis, learn principle according to electromagnetic field, formula and the powerful processor of its inside function with complexity calculate wiring diagram (Wire Map), length (Length), decay (Attenuation), near-end cross 80 multiple parameters such as (Near End Cross Talk are abbreviated as N.E.X.T.), storage also shows.Also can flow to the PC computing machine and show print, it cost an arm and a leg;

Above method of testing all requires eight lines in the eight core twisted-pair feeders by 1-2,3-6, and 5-4, it is right that the 7-8 rule is formed four lines, do not support other rule of combination.For the test of the non-paired mode of connection, for example UMIX system multi-user terminal RS-232 serial communication is only used five lines or seven lines in the eight core twisted-pair feeders, and is just powerless.

The purpose of this utility model provides a kind of unshielded twisted pair tester.

The utility model has been taked following measures in order to achieve the above object:

The unshielded twisted pair tester has transmitter and receiver, and transmitter adopts n single-pole double-throw (SPDT) machinery or electronic switch, and these switches can make each heart yearn of tested cable connect high level or level respectively; The n road rectifier bridge that receiver adopts photoelectrical coupler and diode to form.

Advantage of the present utility model:

This tester has been broken through the dependence of traditional communication cable tester to cable shield, must be with heart yearn by the restriction of particular arrangement rule pairwise testing, realized the test and the demonstration of any connected mode of the free-throw line number (being at least 2 lines) of inner eight lines of unshielded twisted pair.

In addition, the coding transmission mode adopts ripe electric current loop technology, and receiving end adopts photoelectrical coupler and diode display to constitute the multichannel rectifier bridge, and internal resistance is low, is difficult for being interfered reliable operation.

Realize electrical isolation completely by photoelectrical coupler between transmission, the acceptor circuit, the electric field potential difference (PD) can not damaged tester between the buildings.

The holding circuit that R10, D9 form makes this tester to by the phone ringing voltage on the survey line protective capacities being arranged.

Powered battery can be adopted in this tester power consumptive province, is easy to carry, and is fit to the working-yard and uses.

Elaborate below in conjunction with accompanying drawing.

Accompanying drawing is a unshielded twisted pair tester electrical schematic diagram.

Each stationary contact ground connection of the n of unshielded twisted pair tester single-pole double-throw (SPDT) machinery or electronic switch after another stationary contact is connected to each other, connects power Vcc through resistance R 11, and the moving contact of each switch joins with cable splice P1 successively.N road rectifier bridge, the positive pole of every road rectifier bridge diode joins with light-emitting diodes negative pole in each photoelectrical coupler and cable splice P2, after every road rectifier bridge diode cathode is connected to each other, with resistance R 9, R10 and connect, again with each photoelectrical coupler in anodal linking to each other of light emitting diode, be serially connected with voltage stabilizing diode D9 between resistance R 9, the R10, the photosensitive tube one end ground connection in each photoelectrical coupler, the other end with connect power Vcc again after light emitting diode, resistance are connected in series.

A said n single-pole double-throw (SPDT) machinery or electronic switch are that 8 single-pole double-throw (SPDT) machineries or electronic switch are S1, S2, S3, S4, S5, S6, S7, S8, and n road rectifier bridge is that 8 road rectifier bridges that photoelectrical coupler and diode are formed are D1, O1, D2, O2, D3, O3, D4, O4, D5, O5, D6, O6, D7, O7, the light emitting diode that D8, O8 are connected in series with photoelectrical coupler, resistance are L1, R1, L2, R2, L3, R3, L4, R4, L5, R5, L6, R6, L7, R7, L8, R8.And R10, D9 has been composed in series overvoltage crowbar.

Whole testing tool is divided into two of transmitter and receivers, joins the connector the most frequently used RJ-45 eight core plug sockets in the internetworking that can use a computer respectively by other two cable splices and tested unshielded twisted pair two ends.

Transmitter has 8 road single-pole double-throw (SPDT) machineries or electronic switch S1～S8.Earlier S1 is got to the upper end, simultaneously switch S 2～S8 is got to the lower end, make the contact 1 of cable splice P1 receive "+", cable splice contact 2,3,4,5,6,7, No. 8 line ground connection, make electric current 1 outflow from the cable splice contact, from cable splice contact 2,3,4,5,6,7,8 flow into, send and represent 1 coded signal (as a current impulse), after distributing "+" being received in cable splice contact 2 holds, simultaneously all the other cable splice contacts 1,3,4,5,6,7, No. 8 line ground connection, send the coded signal (as 2 current impulses) of representative " 2 " ... up to No. 8, finish afterwards and then recycle and send next time, circulation ceaselessly sends eight coded signals like this.

Receiver end, cable splice P2 contact 1～8 connects forward and reverse diode respectively, forms 8 road rectifier bridges, and the lumination of light emitting diode on that root line of being indicated the current situation of each line, electric current to flow to come by 8 light emitting diodes.

For example, we link 3 of receiver input end respectively with No. 8, No. 2 lines of transmitter output terminal, No. 4 line positions, No. 3 light emitting diodes on the receiver can glimmer 8 times continuously, No. 4 light emitting diode can glimmer 2 times continuously, this is expression just, No. 3 lines of receiver are connected on No. 8 line positions of transmitter, No. 4 line is connected on No. 2 positions of transmitter, and all the other lines do not have to be communicated with free-throw line number (being at least 2 lines), the test and the demonstration of connected mode arbitrarily that has just realized inner eight lines of unshielded twisted pair like this.

The transmitter of this tester is artificial toggle switch, and receiver needs artificial judgment flicker number of times.

Based on principle of uniformity, can adopt chip microprocessor control emission, receive and judge test result, coded system also can make into fast, reliably frequency coding.

Claims

1. a unshielded twisted pair tester is characterized in that it has transmitter and receiver, and said transmitter adopts n single-pole double-throw (SPDT) machinery or electronic switch, and these switches can make each heart yearn of tested cable connect high level or low level respectively; The n road rectifier bridge that receiver adopts photoelectrical coupler and diode to form.

2. a kind of unshielded twisted pair tester according to claim 1, it is characterized in that, each stationary contact ground connection of said n single-pole double-throw (SPDT) machinery or electronic switch, after another stationary contact is connected to each other, [R11] connects power Vcc through resistance, the moving contact of each switch joins with cable splice [P1] successively, said n road rectifier bridge, the positive pole of every road rectifier bridge diode joins with light emitting diode negative pole in each photoelectrical coupler and cable splice [P2], after every road rectifier bridge diode cathode is connected to each other, with resistance [R9], [R10] also connects, again with each photoelectrical coupler in light emitting diode anodal link to each other resistance [R9], be serially connected with voltage stabilizing diode [R9] between [R10], an end ground connection of the photosensitive tube in each photoelectrical coupler, the other end and light emitting diode connect power supply after the resistance serial connection again.

3. a kind of unshielded twisted pair tester according to claim 1 and 2, it is characterized in that said n single-pole double-throw (SPDT) machinery or electronic switch are 8 single-pole double-throw (SPDT) machineries or electronic switch, said n road rectifier bridge is 8 road rectifier bridges that photoelectrical coupler and diode are formed.