JP2003319068A - Circuit measuring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circuit measuring device in which a communication circuit can be tested readily. <P>SOLUTION: The circuit measuring device is connected with a communication circuit to the end user in a telegraph company collocation room. A single microcomputer 60 provided therein reads in test select items inputted from an input unit 67 and writes the ID code of the collocation room facility of the end user or the telegraph company, as a select item, in a VDSL ship set 61. An end user (or the collocation room of the telegraph company) is then simulated using the VDSL chip set 61 and a test is performed by transmitting a test packet to the collocation room of the telegraph company (or the end user). Based on the strength of a signal transmitted from the end user or the collocation room of the telegraph company, interruption of the circuit or failure of the on-line quality can be judged. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a kind of net test system. In particular, it relates to a portable signal line measuring device capable of testing whether a VDSL communication line between a kind of telecommunications carrier collocation room and respective end user equipment is normal.

[0002]

2. Description of the Related Art In recent years, the Internet has gained momentum, and in particular, in the World Wide Web (abbreviated as WWW), there are various multimedia such as voices, photos and dynamic images other than conventional electronic mail. Therefore, when the service on the Internet becomes more popular, the end users of the conventional dial-type telephone network cannot be satisfied with the transmission speed of 28.8, 33.6, or 56 kbps provided by the conventional modem. In addition, area net and ISDN end users are also unsatisfied with the current transmission speeds. In order to obtain a huge amount of data due to the service of such multimedia and to obtain a faster data access capability, the digital data supplier (ISP) has submitted various high speed transmission speed solutions.

At present, a solution that has received more attention is a digital subscriber line (hereinafter referred to as DSL). According to this name, DSL
Is a kind of digital end-user line. Plain Old Telephone service (POTS), which is commonly used
There are various types of DSL systems, and they are generally referred to as xDSL. High-speed digital subscriber line (VeryHigh Da
ta Rate Digital Subscriber Line, the following is VDS
(Abbreviated as L) is an xDSL technology that has received considerable attention. The reason is that it uses existing POTS lines to transmit high speed information, so there is no need to increase existing infrastructure. This tendency increases the speed and efficiency of information distribution and makes human life and work much more convenient.

VDSL (Very High Data Rate Digi
tal Subscriber Line, hereinafter abbreviated as VDSL)
Is currently one of the fastest xDSL technologies in the world. It's only one twisted pair wire, 1
2.9 Mbps to 52.8 Mbps, and further 60 Mbps
can reach s speed. The change in speed is mainly due to the length of the line and can be used symmetrically or asymmetrically. The transmission medium used by VDSL was installed in the existing two-core copper wire telephone net system, and the conventional dial telephone net does not change the existing transmission line, and the existing telephone line is a high-speed digital line. Since it can be changed to, it is possible to maintain a call on the original telephone line while having a high-speed transmission capability. In addition, the telegraph carrier (Central Offic
It is not necessary to replace the colocation room facility 10 of the telephone exchange of e).

As shown in FIG. 1, each of the collocation room facility 10 and the end user facility 20 has one V.
The VDSL system structure 1 can be configured only by mounting the DSL modem 30 and the VDSL modem 40. VDS
The L modem 30 and the VDSL modem 40 increase the transmission speed by transmitting the material using a band larger than voice.

In the VDSL structure (see FIG. 1), a facility 10 of a telecom carrier (Central Office) is connected to each end user 20 via a conventional telephone line 50 and is attached to each end user 20. Since the VDSL modem 40 provided replaces a conventional analog telephone, it is essential to have conventional telephone functionality. The lower band part of the VDSL modem 40 is used as a conventional telephone service, and the band is passively filtered by the POTS splitter 41 of the VDSL modem 40.
The POTS signal is separated from the lower band, and the other bands are used as a function of transmitting data.

Telecom Colocation Room VDSL
The modem 30 is a digital data supporter (ISP)
The data from the Internet and the internet connection signal from the telephone company are converted into VDSL signals by modulation or coding, and P
Existing telephone line 5 by connecting OTS signal and VDSL
0 to each end user 20, and the PO of the VDSL modem 40 attached to each end user 20.
Using the TS demultiplexer 41, the POTS signal can be separated from the digital signal. In addition, the ATU-R equipment 42 is used to decode the modulation or code before the end user 20
To the equipment (for example, a computer) of. Also, the data transmitted from the equipment of each end user 20 to the collocation room 10 of the telegrapher is the VD of the end user 20.
AT to transmit the digital signal to be transmitted via the SL modem 40
The U-C equipment 32 performs modulation and coding, combines the signal and the low band POTS signal, and the POT of the VDSL modem 30 of the collocation room 10 of the telecommunications carrier.
The S duplexer 31 separates the POTS signal from the digital signal again. The data signal to be transmitted is a digital data supplier (IS) after the modulation or the code is decoded.
P), it is transmitted to the internet end user of the telephone company or the company net. VDSL is a type of all-day digital online type that does not interfere with the voice band. When the user uses the VDSL data band, the user can make a call on the same line, which is very popular with the user. In order to adapt to this market trend, many communication system providers will provide VDSL wideband frequency communication services by adding telephone equipment, greatly improving the efficiency of digital communication, and bringing huge business opportunities to system operators. is there.

When a line interruption or a communication quality failure occurs between the collocation room 10 of the telegraph carrier of the VDSL communication line and each end user, the maintenance personnel have a huge volume of computer and equipment such as a VDSL modem. , Simulating the collocation room 10 (or end user 20) of a telegraph company at each point of the line,
Send a test packet to the end user 20 (or the telecom collocation room 10) to perform the test,
It is determined whether or not a reply packet transmitted from the end user 20 (or the collocation room 10 of the telecommunications carrier) has arrived. Thereby, it is confirmed whether the line is interrupted or the communication quality is poor. This test method differs from traditional analog end-user line testing, so
Maintenance personnel need to have a considerable amount of expertise in the internet, and have a huge volume of computers and VDSs.
It is necessary to match with equipment such as an L-modem, and when checking each point of the line one by one, it is necessary for each test site to provide a power source that allows the equipment to operate normally. As mentioned above, since the tester complexity and difficulty are increased, and the maintenance personnel who are familiar with the traditional analog end user's line of the telecommunications carrier cannot handle well, the telecommunications carrier can constantly expand the line and at the same time improve the communication line. Maintaining quality is an important issue for VDSL wide frequency systems.

[0009]

SUMMARY OF THE INVENTION In order to improve the above-mentioned problems that occur when performing a communication line test of a VDSL wide frequency system, the inventor of the present invention has conducted a long research and experiment and then carried out the portable VDSL of the present invention. We have developed a signal line measuring device. The line maintenance personnel of the telecommunications carrier can test the communication line between the collocation room of the telecommunications carrier and each end user with the line measuring device at any time to detect problems quickly and smoothly.

One object of the present invention is to provide one microcomputer, by which an inspector reads a test selection item input by an input device, and then, as a selection item, a collocation room of an end user or a telecommunications carrier. Since the equipment identification code can be written on the VDSL chipset provided on the equipment, the VDS
Using the L chip set, the end user (or the collocation room of the telecommunications carrier) is simulated, and a test packet is transmitted to the collocation room (or the end user) of the telecommunications carrier to perform the test. The strength of the signal transmitted from the collocation room determines the line interruption or online quality failure during that period, and the test result is displayed on one display unit so that the inspector can always check the line measuring device. An object of the present invention is to provide a line measuring device capable of quickly measuring a line problem between a collocation room of a telecommunications carrier and an end user because it is portable.

Another object of the present invention is to provide one standby power source on the line measuring device as a power source for constant operation, so that the inspector can carry the line measuring device, so that it is necessary to separately find a power source. The purpose is to provide a line measuring device that can be used smoothly. Another object of the present invention is to provide a display unit through which a test result is displayed and to provide a confirmation to an inspector, thereby making it possible to easily communicate with a collocation room of a telegrapher and an end user. It is an object of the present invention to provide a line measuring device capable of effectively improving line maintenance and quality because it is possible to promptly determine and deal with line problems between lines.

[0012]

The present invention is a kind of portable V
The present invention relates to a DSL signal line measuring device. The line measurement device can be connected to a communication line to an end user of a telecom colocation room. A microcomputer is installed in it, and after reading the test selection items input by the inspector using the input device, the identification code of the collocation room facility of the end user or the telegrapher as a selection item is provided on it. Since it can be written in the existing VDSL chipset, VD
Using the SL chip set, the end user (or the telecommunications carrier's collocation room) is simulated and a test packet is transmitted to the telecommunications carrier's collocation room (or the end user) to perform a test. Depending on the strength of the signal transmitted from the collocation room, it is possible to judge the line interruption or online quality failure during that period.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 2 and 3, according to a portable VDSL signal line measuring apparatus according to an embodiment of the present invention, there is one portable housing 6 in which the necessary electric circuits and units are mounted. In the unit, one microcomputer 60, one VDSL chip set 61, one analog / digital converter 62, frequency filter 63, frequency filter 64, RJ-11 plug 65 and RJ-11 plug 66.
Therefore, the unit can be operated normally by controlling all electric circuits using the microcomputer 60. The VDSL chipset 61 is connected to the microcomputer 60, and an electric circuit necessary for connecting to the net is provided inside. The analog / digital converter 62 is connected to the VDSL chipset 61.
By connecting with, the received digital signal is converted into an analog signal, or the received analog signal is converted into a digital signal. It should be noted that one signal expander 621
The two-to-one analog switch 622 and the two-to-one analog switch 622 are connected to the microcomputer 60, the frequency filter 63 and the frequency filter 64, respectively. The online state of the frequency filter 64 is switched. The frequency filters are a frequency filter 63 simulating a telecommunications carrier collocation room side and a frequency filter 64 simulating one end user 20, respectively. Frequency filter 6
Reference numeral 3 filters the signal received from the telecommunications carrier colocation room side or transmitted to the telecommunications carrier colocation room side. The frequency filter 64 filters a signal received from the end user or transmitted to the end user. Since the other ends of the frequency filter 63 and the frequency filter 64 are connected to the plug 65 and the plug 66 (RJ-11 plug may be used, but not limited thereto), the plug 65 and the plug 66 are connected to the signal line 90 and the signal line 90, respectively. The signal line 91 is connected to the telecommunications company colocation room and the end user's net facility.

As shown in FIGS. 2 and 3, a portable VDS
The L signal line measuring device further includes one liquid crystal display panel 68, one input unit 67 (for example, an input key), one
There are units such as a set indicator lamp 69 (different color diode indicator lamp) and a set of auxiliary power source set 70 (for example: battery), each unit is connected to the microcomputer 60, and the input unit 67 is for data input and test. Used for selecting items, the liquid crystal display panel 68 and the indicator lamp 69 are respectively used as auxiliary power sources for displaying the input data preliminary test results.

In one VDSL net system,
When a problem occurs and the inspector conducts an online test of the net between the end user and the telecom collocation room, he goes to each point of the net with a handheld VDSL signal line measuring device and goes to the telecom collocation Remove the signal line plug at each point connecting to the room and the end user, connect it to the two corresponding plugs 65 and 66, and through the signal line, the collocation room of the telecommunications carrier and the net equipment of the end user. Then, the item to be tested by the input unit 67 is selected based on the test item displayed on the liquid crystal display panel 68.
Since the microcomputer 60 of the line measuring device reads the test selection items input by the inspector, the identification code of the collocation room facility of the end user or the telegraph operator as the selection item can be written in the VDSL chipset 61. Using, to simulate an end user (or a telecommunications carrier's collocation room), send a test packet to the telecommunications carrier's collocation room (or end user), and then test
Depending on the strength of the signal transmitted from the end user or telecom collocation room, the indicator lamp 69 is used to display the test results. As a result, it is possible to judge the line interruption or online quality failure during that time. As described above, it is possible to quickly find a problem by detecting each point.

When the line measuring device of the present invention conducts an online test of a telecommunications carrier end user and a telecommunications carrier collocation room, the microcomputer 60 of the line measuring device performs the following steps. See Figure 4. (101) First, the test item selected by the input unit 67 is judged, and if the test selection item is to select the line from the point to the end user equipment and perform the test, immediately perform step (102). , If you are going to test by selecting the line from the point to the telecommunications carrier collocation room, immediately follow the steps (10
Perform 3).

(102) Enter into the memory (not shown in the figure) of the microcomputer 60, and read the identification code corresponding to the selected telegrapher collocation room in the memory stored in advance. , By writing it to the VDSL chipset 61,
Using the L chipset 61, virtualize the collocation room of the telegraph company, connect it to the end user equipment, and display the virtual partner (eg, collocation room) on the liquid crystal display panel 68 for inspection. Provide as a reference to personnel and then perform step (104).

(103) By entering the memory of the microcomputer 60, reading the identification code corresponding to the end user equipment of the selected item in the memory stored in advance, and writing it in the VDSL chip set 61. , VDSL chipset 61 is used to virtualize the end user equipment and then connect it to the collocation room of the telegrapher to display the virtualized partner (eg, end user equipment) on the liquid crystal display panel 68. , Provide it to the inspector as a reference, and then step (10
4) is performed.

(104) A test packet is transmitted to the collocation room (or end user) of the telecommunications carrier, and it is determined whether the packet transmitted from the collocation room (or end user) of the telecommunications carrier has been received. When the determination is YES, the process proceeds to (105), and when the determination is NO, the process returns to step (104). It determines if it is online.

(105) A lamp for displaying the online status of the VDSL line is lit on the display lamp 69, and the numerical value of the received packet signal is read (for example, QAM, S
Numerical values of signals such as NR and TxPower). (106) Convert the numerical value of the read packet signal into a 10-digit numerical value, display the 10-digit numerical value on the liquid crystal display panel 68, and provide it to the inspector as a reference.
Perform 7).

(107) Since the strength of the received signal is judged by performing the calculation by the 10-digit numerical value, and the display lamp 69 of a different color is used according to the result of the calculation, the lamp of a different color is turned on. , The inspector can use the different colored lamps to clearly determine the line status.

When the inspector uses the line measuring device of the present invention to detect the online between the end user and the telecom carrier collocation room, the microcomputer of the line measuring device is the test selection item selected by the inspector. Simulates a telegrapher collocation room or end-user equipment to measure the VDSL line to be detected in two directions and detect the online status. For example, V
The establishment of DSL online, the QAM value in two directions, the TxPower value on the measured side, and the SNR value in two directions are displayed on the liquid crystal display panel 68 and provided to the inspector as a reference. The microcomputer of the line measuring device turns on the indicator lamp 69 of a different color according to the measured QAM value by using the following operation rule preset in the memory. See Figure 4.

(1) When the QAM value is 4, when the SNR value is <15, the yellow lamp is turned on to indicate that the signal is weak, and when the SNR value is> 15, the green lamp is turned on. Indicates that the signal is good. (2) When the QAM value is 8, when the SNR value is <18, it indicates that the signal is weak by turning on the yellow lamp, and when the SNR value is> 18, the signal is normal by turning on the green lamp. Is displayed.

(3) SNR when QAM value = 16
When the value <21, the yellow lamp is turned on to indicate that the signal is weak, and when the SNR value> 21, the green lamp is turned on to indicate that the signal is normal. (4) In the case of QAM value = 64, when the SNR value is <27, it indicates that the signal is weak by turning on the yellow lamp, and when the SNR value is> 27, the signal is normal by turning on the green lamp. Is displayed.

(5) If QAM value = 256, SN
When the R value is <33, the yellow lamp is turned on to indicate that the signal is weak, and when the SNR value is> 33, the green lamp is turned on to indicate that the signal is normal. As described above, the inspector can clearly judge the transmission status of the VDSL line by the display lamps 69 of different colors. still,
Since the standby power supply set 70 of the line measuring device can provide power for normal operation, the power inspector does not need to search for a power converter and a power source. Measure one point,
Since online problems between the end user and the collocation room can be quickly found and eliminated, the efficiency and quality of line maintenance can be effectively improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a system structure of a conventional VDSL signal wide frequency system.

FIG. 2 is a perspective view showing a line measuring device according to an embodiment of the present invention.

FIG. 3 is a block diagram showing an electric circuit structure of a line measuring device according to an embodiment of the present invention.

FIG. 4 is a diagram showing a flow chart of control of the line measuring device according to one embodiment of the present invention.

[Explanation of symbols]

60 microcomputer 61 VDSL Chipset 62 analog / digital converter 63 frequency filter 64 frequency filter 65 plug 66 plug 67 Input unit 68 LCD display panel 69 indicator lamp 70 Standby power set 622 2 to 1 analog switch

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5K027 CC01 FF02 LL05 MM17                 5K035 AA01 AA04 BB02 CC05 DD01                       FF01 KK04                 5K051 AA09 BB02 CC00 DD07 DD12                       DD13 EE04 HH01 LL02

Claims (7)

[Claims] 1. A kind of portable VDSL signal line measuring device, which can be connected to a line between a telecommunications carrier collocation room and each end user, has a housing, in which all electrical The circuit and unit are attached, there is a microcomputer, the microcomputer can operate the unit normally by controlling all electric circuits, there is an input unit, and the input unit is connected with the microcomputer It is used to select data input and test items, and there is a VDSL chipset, which is connected to a microcomputer, and inside the VDSL chipset are the electrical circuits necessary for net connection. Microcomputer After reading the test selection item input by the input unit, it is possible to write the identification code of the collocation room facility of the end user or the telegrapher as the test selection item in the VDSL chip set, so that the VDSL chip set can be used. The collocation room of the end user or the telecommunications carrier to perform a test by sending a test packet to the collocation room of the telecommunications carrier or the end user, and then confirm the strength of the signal transmitted from the collocation room of the end user or the telecommunications carrier. A line measuring device characterized by determining line interruption or online quality failure. 2. There is an analog / digital converter,
The analog / digital converters are VDSL
By connecting to the chipset and the microcomputer, the received digital signal is converted into an analog signal, or the received analog signal is converted into a digital signal, and there are two frequency filters. Has one end connected to an analog / digital converter to filter the received or transmitted signal, and has two plugs, one of which is the other end of two frequency filters. 2. The line measuring device according to claim 1, wherein the line measuring device is connected to the telecommunications carrier collocation room and the end user's net facility by a signal line. 3. A signal expander, the signal expander being connected to an analog / digital converter,
The received signal is expanded, and there is a 2-to-1 analog switch, and the 2-to-1 analog switch is connected to a signal expander and a microcomputer, respectively, to control the online state of the frequency filter after being controlled by the microcomputer. 3. The line measuring device according to claim 2, wherein the line measuring device is switched. 4. There is a frequency filter simulating the telecommunications carrier colocation room side, and the frequency filter filters the signal received from the telecommunications carrier collocation room side or transmitted to the telecommunications carrier collocation room side, and the end user side. There is a frequency filter that simulates the frequency filter. The frequency filter filters the signal received from the end user or transmitted to the end user, and the other ends of the two frequency filters are connected to one plug each. 3. The line measuring device according to claim 2, wherein the two plugs are used to connect to a telecom carrier collocation room and an end user's net equipment through signal lines, respectively. 5. A liquid crystal display panel is provided, and the liquid crystal display panel is connected to a microcomputer,
The line measuring device according to claim 1, wherein the input data and the test result are displayed. 6. The line measuring device according to claim 1, wherein there is a display lamp, and the display lamp is connected to a microcomputer to display the test result. 7. A set of standby power supplies is provided, and the standby power supply set is connected to each unit to provide a power source that enables normal operation of all units of the line measuring device. Claim 1 characterized by
Line measurement device described.