CN103399211B - The proving installation of Z interface subscriber loop resistance and method of testing - Google Patents
The proving installation of Z interface subscriber loop resistance and method of testing Download PDFInfo
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Abstract
The invention discloses a kind of proving installation and method of testing of Z interface subscriber loop resistance, relate to field of hardware, this proving installation comprises the equivalent circuit of main dialing telephone, called phone, equipment under test, reometer, voltage table and simulation Z Interface User line characteristic, called phone is in parallel with equipment under test, reometer is connected with main dialing telephone, voltage table is in parallel with equipment under test, in the equivalent circuit of simulation Z Interface User line characteristic, one end of R1, R2 parallel connection is connected with reometer, the other end in parallel and K1 one end fits; The K2 other end is connected with equipment under test; One end of R5, R6 parallel connection is connected with main dialing telephone, and the other end in parallel and K3 one end fits, the K4 other end is connected with equipment under test.The present invention does not need manually to intervene adjustment, easy and simple to handle, testing efficiency is higher, and test result is accurate, and error is less, and by the direct read test result of reometer, more intuitively, proving installation can be made into complete enclosed type.
Description
Technical field
The present invention relates to field of hardware, particularly relate to a kind of proving installation and method of testing of Z interface subscriber loop resistance.
Background technology
Z interface simulates two line user's interfaces exactly, current Z interface subscriber loop resistance index request is divided into following two kinds of situations: under narrow band service environment or large-scale AG (Access Gateway, access gateway) equipment, at subscribers feeder wire insulation resistance: >=20k Ω, subscribers feeder line capacitance: under the condition of≤0.7 μ F, guarantee the user of normal call, when feed current is 18mA, subscriber loop resistance is necessary >=1800 Ω.At small-sized IAD (Integrated Access Device, integrated access equipment) equipment or similar devices, at subscribers feeder wire insulation resistance: >=20k Ω.Subscribers feeder line capacitance: under the condition of≤0.7 μ F, guarantee the user of normal call, when feed current=18mA, subscriber loop resistance is necessary >=1000 Ω.
Shown in Figure 1, existing subscribers feeder simulation test circuit comprises 4 variable resistor R0, a fixed resistance R and electric capacity C, and fixed resistance R is in parallel with electric capacity C, variable resistor R0=0 ~ 600 Ω, c=0.5 μ f, R=20K Ω.According to this subscribers feeder simulation test circuit, current employing test connection layout as shown in Figure 2 carries out Z interface subscriber loop resistance test, need the resistance manually changing all adjustable resistance R0 in testing, and the resistance of all adjustable resistance R0 must be identical, the electric current of multimeter is made to be 18mA, read the numerical value of now voltage table, then according to voltage table, reometer numerical evaluation Z interface subscriber loop resistance.
There is following defect in the method for testing of existing Z interface subscriber loop resistance:
(1) resistance of manual adjustments adjustable resistance is difficult to make the resistance of 4 adjustable resistance R0 identical, also need to measure whether electric current is 18mA, if be not 18mA, need the resistance continuing manually to change 4 adjustable resistance R0, the resistance repeatedly regulating 4 variable resistor R0 is needed in test process, complex operation, testing efficiency is lower, and measuring error is larger.
(2) need just can obtain Z interface subscriber loop resistance by calculating, measurement result is not directly perceived.
(3) proving installation is difficult to be made into Totally-enclosed-type.
Summary of the invention
The object of the invention is the deficiency in order to overcome above-mentioned background technology, a kind of proving installation and method of testing of Z interface subscriber loop resistance are provided, do not need manually to intervene adjustment, avoid in test process and repeatedly regulate variable-resistance complicated processes, easy and simple to handle, testing efficiency is higher, the resistance consistance of fixed resistance is better, test result is accurate, error is less, by the direct read test result of reometer reading, do not need by calculating resistance, test result is relatively more directly perceived, and proving installation can be made into complete enclosed type.
The invention provides a kind of equivalent circuit of simulating Z Interface User line characteristic, comprise resistance R and electric capacity C, R=20K Ω, C=0.5 μ f, resistance R is in parallel with electric capacity C, also comprise the first resistance R1, second resistance R2, first K switch 1, 3rd resistance R3, 4th resistance R4, second switch K2, 5th resistance R5, 6th resistance R6, 3rd K switch 3, 7th resistance R7, 8th resistance R8, 4th K switch 4, first resistance R1, second resistance R2, 3rd resistance R3, 4th resistance R4, 5th resistance R5, 6th resistance R6, 7th resistance R7, 8th resistance R8 is fixed resistance, R1=R3=R5=R7=250 Ω, R2=R4=R6=R8=450 Ω, with the one end fits of the first K switch 1 after first resistance R1 is in parallel with the second resistance R2, one end of the other end of the first K switch 1 contact resistance R simultaneously, one end of electric capacity C, one end of 3rd resistance R3, one end of 4th resistance R4, 3rd resistance R3 is in parallel with the 4th resistance R4, the other end of the 3rd resistance R3, the other end of the 4th resistance R4 and the one end fits of second switch K2, with the one end fits of the 3rd K switch 3 after 5th resistance R5 is in parallel with the 6th resistance R6, the other end of the 3rd K switch 3 is the other end of contact resistance R, the other end of electric capacity C, one end of the 7th resistance R7, one end of the 8th resistance R8 simultaneously, 7th resistance R7 is in parallel with the 8th resistance R8, the one end fits of the other end of the 7th resistance R7, the other end of the 8th resistance R8 and the 4th K switch 4, first K switch 1, second switch K2, the 3rd K switch 3, the 4th K switch 4 be a composition linked switch jointly, the button of operations linkage switch, select access resistance to be R1, R3, R5, R7 of 250 Ω, or select access resistance to be R2, R4, R6, R8 of 450 Ω.
The embodiment of the present invention also provides a kind of proving installation of the Z interface subscriber loop resistance based on above-mentioned equivalent circuit, whether be 1000 Ω for testing Z interface subscriber loop resistance, 1800 Ω, this proving installation comprises main dialing telephone, called phone, equipment under test, reometer, the equivalent circuit of voltage table and described simulation Z Interface User line characteristic, called phone is in parallel with equipment under test, reometer is connected with main dialing telephone, voltage table is in parallel with equipment under test, the first resistance R1 in the equivalent circuit of simulation Z Interface User line characteristic, one end of second resistance R2 parallel connection is connected with reometer, the other end in parallel and the one end fits of the first K switch 1, the other end of second switch K2 is connected with equipment under test, one end of 5th resistance R5, the 6th resistance R6 parallel connection is connected with main dialing telephone, the other end in parallel and the one end fits of the 3rd K switch 3, and the other end of the 4th K switch 4 is connected with equipment under test, when linked switch and R1, R3, R5, R7 are connected, whether test subscriber's loop resitance is 1000 Ω, when linked switch and R2, R4, R6, R8 are connected, whether test subscriber's loop resitance is 1800 Ω.
On the basis of technique scheme, the 3rd connection terminal that described proving installation outside comprises the first connection terminal that reometer draws, the second connection terminal, voltage table are drawn, the 4th connection terminal, for connecting the 5th Wiring port of main dialing telephone telephony interface, the button for the 6th Wiring port and linked switch that connect the telephony interface of equipment under test, equipment under test comprises some telephony interfaces.
The embodiment of the present invention also provides a kind of method of testing of the Z interface subscriber loop resistance based on above-mentioned proving installation, and whether are 1000 Ω, 1800 Ω for testing Z interface subscriber loop resistance, this method of testing comprises the following steps:
S1, the 6th Wiring port of proving installation is connected to the first telephony interface of equipment under test, called phone is connected to equipment under test other telephony interface except the first telephony interface; According to the button of the type operations linked switch of equipment under test, select access resistance to be R1, R3, R5, R7 of 250 Ω, or select access resistance to be R2, R4, R6, R8 of 450 Ω;
S2, main dialing telephone and called phone are called mutually, if got through, represent that two telephone set normal talkings complete, on-hook, enters step S3; If can not get through, check reason, terminate;
S3, dial called phone with main dialing telephone, called receiver off-book, normal talking, check the numerical value of now reometer, if the numerical value >=18mA of now reometer, represent the subscriber loop resistance qualified of the first telephony interface of equipment under test; If the numerical value < 18mA of reometer, represent that the subscriber loop resistance index of the first telephony interface of equipment under test is defective;
S4, successively the 6th Wiring port of proving installation to be connected with other telephony interface of equipment under test, repeat step S2, S3, whether the subscriber loop resistance index of other telephony interface of test equipment under test is qualified, if the subscriber loop resistance index of all telephony interfaces of equipment under test is all qualified, test result is qualified; If the subscriber loop resistance index of some or certain several telephony interface of equipment under test is defective, test result is defective.
On the basis of technique scheme, described in step S1 according to the process of the button of the type operations linked switch of equipment under test be: if equipment under test is large-scale access gateway AG equipment, the button of operations linkage switch, access resistance is R2, R4, R6, R8 of 450 Ω; If equipment under test is the button of Small-size Integrated Access Device IAD equipment, operations linkage switch, access resistance is R1, R3, R5, R7 of 250 Ω.
On the basis of technique scheme, further comprising the steps of after step S4: the numerical value checking voltage table, check whether voltage table numerical value is the loop resitance resistance selected divided by reometer numerical value, verifies that whether this proving installation is working properly.
Compared with prior art, advantage of the present invention is as follows:
(1) the present invention simplifies Z interface subscriber loop resistance testing scheme, each variable resistor is replaced with two fixed resistances in parallel, select to access one of them fixed resistance by linked switch, the resistance of one of them fixed resistance is 250 Ω, whether be 1000 Ω for test subscriber's loop resitance, whether the resistance of another fixed resistance is 450 Ω, be 1800 Ω for test subscriber's loop resitance.Replace variable resistor with fixed resistance, do not need manually to intervene adjustment, avoid in test process and repeatedly regulate variable-resistance complicated processes, easy and simple to handle, testing efficiency is higher, the resistance consistance of fixed resistance is better, and test result is accurate, and error is less.
(2) the present invention is in test process, and the numerical value directly reading reometer obtains test result, and do not need by calculating resistance, test result is more directly perceived.
(3) proving installation of the present invention can be made into complete enclosed type.
(4) proving installation of the present invention only has the devices such as resistance, electric capacity, switch, easily makes, cost is lower.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of existing subscribers feeder simulation test circuit.
Fig. 2 is the connecting circuit figure of existing Z interface subscriber loop resistance test.
Fig. 3 is the circuit diagram of the equivalent circuit of simulating Z Interface User line characteristic in the embodiment of the present invention.
Fig. 4 is the circuit diagram of Z interface subscriber loop resistance proving installation in the embodiment of the present invention.
Fig. 5 is the outside drawing of Z interface subscriber loop resistance proving installation in the embodiment of the present invention.
Reference numeral: the 1-the first connection terminal, the 2-the second connection terminal, the 3-the three connection terminal, the 4-the four connection terminal, the 5-the five Wiring port, the 6-the six Wiring port, the button of 7-linked switch.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
Shown in Figure 3, the embodiment of the present invention provides a kind of equivalent circuit of simulating Z Interface User line characteristic, comprise resistance R, electric capacity C, first resistance R1, second resistance R2, first K switch 1, 3rd resistance R3, 4th resistance R4, second switch K2, 5th resistance R5, 6th resistance R6, 3rd K switch 3, 7th resistance R7, 8th resistance R8, 4th K switch 4, first resistance R1, second resistance R2, 3rd resistance R3, 4th resistance R4, 5th resistance R5, 6th resistance R6, 7th resistance R7, 8th resistance R8 is fixed resistance, R=20K Ω, C=0.5 μ f, R1=R3=R5=R7=250 Ω, R2=R4=R6=R8=450 Ω, resistance R is in parallel with electric capacity C, with the one end fits of the first K switch 1 after first resistance R1 is in parallel with the second resistance R2, one end of the other end of the first K switch 1 contact resistance R simultaneously, one end of electric capacity C, one end of 3rd resistance R3, one end of 4th resistance R4, 3rd resistance R3 is in parallel with the 4th resistance R4, the other end of the 3rd resistance R3, the other end of the 4th resistance R4 and the one end fits of second switch K2, with the one end fits of the 3rd K switch 3 after 5th resistance R5 is in parallel with the 6th resistance R6, the other end of the 3rd K switch 3 is the other end of contact resistance R, the other end of electric capacity C, one end of the 7th resistance R7, one end of the 8th resistance R8 simultaneously, 7th resistance R7 is in parallel with the 8th resistance R8, the one end fits of the other end of the 7th resistance R7, the other end of the 8th resistance R8 and the 4th K switch 4.First K switch 1, second switch K2, the 3rd K switch 3, the 4th K switch 4 be a composition linked switch jointly, the button of operations linkage switch, can select to access R1, R3, R5, R7 that resistance is 250 Ω, or select access resistance to be R2, R4, R6, R8 of 450 Ω.
Based on the equivalent circuit of above-mentioned simulation Z Interface User line characteristic, the embodiment of the present invention also provides a kind of proving installation of Z interface subscriber loop resistance, whether be 1000 Ω for testing Z interface subscriber loop resistance, 1800 Ω, shown in Figure 4, this proving installation comprises main dialing telephone, called phone, equipment under test, reometer, the equivalent circuit of voltage table and simulation Z Interface User line characteristic, called phone is in parallel with equipment under test, reometer is connected with main dialing telephone, voltage table is in parallel with equipment under test, the first resistance R1 in the equivalent circuit of simulation Z Interface User line characteristic, one end of second resistance R2 parallel connection is connected with reometer, the other end in parallel and the one end fits of the first K switch 1, the other end of second switch K2 is connected with equipment under test, one end of 5th resistance R5, the 6th resistance R6 parallel connection is connected with main dialing telephone, the other end in parallel and the one end fits of the 3rd K switch 3, and the other end of the 4th K switch 4 is connected with equipment under test, when linked switch and R1, R3, R5, R7 are connected, whether test subscriber's loop resitance is 1000 Ω, when linked switch and R2, R4, R6, R8 are connected, whether test subscriber's loop resitance is 1800 Ω.
Shown in Figure 5, proving installation outside comprises the first connection terminal 1, second connection terminal 2 that reometer draws, voltage table is drawn the 3rd connection terminal 3, the 4th connection terminal 4, for connecting the 5th Wiring port 5 of main dialing telephone telephony interface, the button 7 for the 6th Wiring port 6 and linked switch that connect the telephony interface of equipment under test, equipment under test comprises some telephony interfaces.
Based on the proving installation of above-mentioned Z interface subscriber loop resistance, the embodiment of the present invention also provides a kind of method of testing of Z interface subscriber loop resistance, and whether are 1000 Ω, 1800 Ω for testing Z interface subscriber loop resistance, this method of testing comprises the following steps:
S1, the Wiring port 6 of proving installation is connected to the first telephony interface of equipment under test, called phone is connected to equipment under test other telephony interface except the first telephony interface; The button 7 of operations linkage switch, can select to access R1, R3, R5, R7 that resistance is 250 Ω, or selects access resistance to be R2, R4, R6, R8 of 450 Ω; Button 7 according to the type operations linked switch of equipment under test: if equipment under test is the button 7 of large-scale AG equipment, operations linkage switch, access resistance is R2, R4, R6, R8 of 450 Ω; If equipment under test is the button 7 of small-sized IAD equipment, operations linkage switch, access resistance is R1, R3, R5, R7 of 250 Ω;
S2, main dialing telephone and called phone are called mutually, if got through, represent that two telephone set normal talkings complete, on-hook, enters step S3; If can not get through, check reason, terminate;
S3, dial called phone with main dialing telephone, called receiver off-book, normal talking, check the numerical value of now reometer, if the numerical value >=18mA of now reometer, represent the subscriber loop resistance qualified of the first telephony interface of equipment under test; If the numerical value < 18mA of reometer, represent that the subscriber loop resistance index of the first telephony interface of equipment under test is defective;
S4, successively the Wiring port 6 of proving installation to be connected with other telephony interface of equipment under test, repeat step S2, S3, whether the subscriber loop resistance index of other telephony interface of test equipment under test is qualified, if the subscriber loop resistance index of all telephony interfaces of equipment under test is all qualified, test result is qualified; If the subscriber loop resistance index of some or certain several telephony interface of equipment under test is defective, test result is defective;
S5, check the numerical value of voltage table, check whether voltage table numerical value is the loop resitance resistance selected divided by reometer numerical value, verifies that whether this proving installation is working properly.
Those skilled in the art can carry out various modifications and variations to the embodiment of the present invention, if these amendments and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then these revise and modification also within protection scope of the present invention.
The prior art that the content do not described in detail in instructions is known to the skilled person.
Claims (6)
1. simulate the equivalent circuit of Z Interface User line characteristic for one kind, comprise resistance R and electric capacity C, R=20K Ω, C=0.5 μ f, resistance R is in parallel with electric capacity C, it is characterized in that: also comprise the first resistance R1, second resistance R2, first K switch 1, 3rd resistance R3, 4th resistance R4, second switch K2, 5th resistance R5, 6th resistance R6, 3rd K switch 3, 7th resistance R7, 8th resistance R8, 4th K switch 4, first resistance R1, second resistance R2, 3rd resistance R3, 4th resistance R4, 5th resistance R5, 6th resistance R6, 7th resistance R7, 8th resistance R8 is fixed resistance, R1=R3=R5=R7=250 Ω, R2=R4=R6=R8=450 Ω, with the one end fits of the first K switch 1 after first resistance R1 is in parallel with the second resistance R2, one end of the other end of the first K switch 1 contact resistance R simultaneously, one end of electric capacity C, one end of 3rd resistance R3, one end of 4th resistance R4, 3rd resistance R3 is in parallel with the 4th resistance R4, the other end of the 3rd resistance R3, the other end of the 4th resistance R4 and the one end fits of second switch K2, with the one end fits of the 3rd K switch 3 after 5th resistance R5 is in parallel with the 6th resistance R6, the other end of the 3rd K switch 3 is the other end of contact resistance R, the other end of electric capacity C, one end of the 7th resistance R7, one end of the 8th resistance R8 simultaneously, 7th resistance R7 is in parallel with the 8th resistance R8, the one end fits of the other end of the 7th resistance R7, the other end of the 8th resistance R8 and the 4th K switch 4, first K switch 1, second switch K2, the 3rd K switch 3, the 4th K switch 4 be a composition linked switch jointly, the button of operations linkage switch, select access resistance to be R1, R3, R5, R7 of 250 Ω, or select access resistance to be R2, R4, R6, R8 of 450 Ω.
2. the proving installation based on the Z interface subscriber loop resistance of equivalent circuit described in claim 1, whether be 1000 Ω for testing Z interface subscriber loop resistance, 1800 Ω, it is characterized in that: this proving installation comprises main dialing telephone, called phone, equipment under test, reometer, the equivalent circuit of voltage table and described simulation Z Interface User line characteristic, called phone is in parallel with equipment under test, reometer is connected with main dialing telephone, voltage table is in parallel with equipment under test, the first resistance R1 in the equivalent circuit of simulation Z Interface User line characteristic, one end of second resistance R2 parallel connection is connected with reometer, the other end in parallel and the one end fits of the first K switch 1, the other end of second switch K2 is connected with equipment under test, one end of 5th resistance R5, the 6th resistance R6 parallel connection is connected with main dialing telephone, the other end in parallel and the one end fits of the 3rd K switch 3, and the other end of the 4th K switch 4 is connected with equipment under test, when linked switch and R1, R3, R5, R7 are connected, whether test subscriber's loop resitance is 1000 Ω, when linked switch and R2, R4, R6, R8 are connected, whether test subscriber's loop resitance is 1800 Ω.
3. the proving installation of Z interface subscriber loop resistance as claimed in claim 2, it is characterized in that: the 3rd connection terminal (3) that described proving installation outside comprises the first connection terminal (1) that reometer draws, the second connection terminal (2), voltage table are drawn, the 4th connection terminal (4), for connecting the 5th Wiring port (5) of main dialing telephone telephony interface, the button (7) for the 6th Wiring port (6) and linked switch that connect the telephony interface of equipment under test, equipment under test comprises some telephony interfaces.
4. whether, based on a method of testing for the Z interface subscriber loop resistance of proving installation described in claim 3, be 1000 Ω, 1800 Ω for testing Z interface subscriber loop resistance, it is characterized in that, this method of testing comprises the following steps:
S1, the 6th Wiring port (6) of proving installation is connected to the first telephony interface of equipment under test, called phone is connected to equipment under test other telephony interface except the first telephony interface; According to the button (7) of the type operations linked switch of equipment under test, select access resistance to be R1, R3, R5, R7 of 250 Ω, or select access resistance to be R2, R4, R6, R8 of 450 Ω;
S2, main dialing telephone and called phone are called mutually, if got through, represent that two telephone set normal talkings complete, on-hook, enters step S3; If can not get through, check reason, terminate;
S3, dial called phone with main dialing telephone, called receiver off-book, normal talking, check the numerical value of now reometer, if the numerical value >=18mA of now reometer, represent the subscriber loop resistance qualified of the first telephony interface of equipment under test; If the numerical value < 18mA of reometer, represent that the subscriber loop resistance index of the first telephony interface of equipment under test is defective;
S4, successively the 6th Wiring port (6) of proving installation to be connected with other telephony interface of equipment under test, repeat step S2, S3, whether the subscriber loop resistance index of other telephony interface of test equipment under test is qualified, if the subscriber loop resistance index of all telephony interfaces of equipment under test is all qualified, test result is qualified; If the subscriber loop resistance index of some or certain several telephony interface of equipment under test is defective, test result is defective.
5. the method for testing of Z interface subscriber loop resistance as claimed in claim 4, it is characterized in that: the process of the button (7) according to the type operations linked switch of equipment under test described in step S1 is: if equipment under test is large-scale access gateway AG equipment, the button (7) of operations linkage switch, access resistance is R2, R4, R6, R8 of 450 Ω; If equipment under test is Small-size Integrated Access Device IAD equipment, the button (7) of operations linkage switch, access resistance is R1, R3, R5, R7 of 250 Ω.
6. the method for testing of the Z interface subscriber loop resistance as described in claim 4 or 5, it is characterized in that: further comprising the steps of after step S4: the numerical value checking voltage table, check whether voltage table numerical value is the loop resitance resistance selected divided by reometer numerical value, verifies that whether this proving installation is working properly.
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| CN1257371A (en) * | 1999-11-01 | 2000-06-21 | 陈杰 | Four-line loop testing method and device for communication channel |
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| WO2006078934A2 (en) * | 2005-01-18 | 2006-07-27 | Tollgrade Communications, Inc. | Apparatus and method for measuring loop insertion loss single-endedly |
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| CN1257371A (en) * | 1999-11-01 | 2000-06-21 | 陈杰 | Four-line loop testing method and device for communication channel |
| CN1784881A (en) * | 2003-05-12 | 2006-06-07 | 艾利森电话股份有限公司 | Method and arrangement for signal loop test |
| CN2807627Y (en) * | 2005-05-27 | 2006-08-16 | 华为技术有限公司 | Broad band user board |
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