KR20010057402A - Test system for modem - Google Patents

Abstract

PURPOSE: A subscriber modem line test apparatus is provided to measure a line state before a subscriber modem of an ADSL is installed, check a subscriber line state and judge the installation of a modem. CONSTITUTION: A pattern generator(10) is installed in a telephone station system(DSLAM) and generates a test pattern. The pattern generator(10) periodically generates certain test data, and different ATM cells are repeatedly generated. An ADSL function block unit(20) receives ADSL pattern data generated by the pattern generator based on a link with the telephone station system(DSLAM) through a telephone line and receives information, upstream rate, downstream rate and noise margin. An ATM function block(30) analyses the received ATM cell and checks whether the ATM cell having a constant pattern is inputted. A line state judging unit(40) judges the current state of the line based on the signals of the ADSL function block(20) and the ATM function block(30), and an external interface(50) is connected with an external display unit for informing a result of the judgement by the line state judging unit(40) to a user.

Description

Subscriber modem line test device {Test system for modem}

The present invention relates to a subscriber modem line test apparatus, and more particularly, before installing a modem of an asymmetric optical subscriber transmitter (ADSL) in the field, the state of the line is measured from the standpoint of the modem to check whether there is an abnormal state of the subscriber line. The present invention relates to a subscriber modem line test apparatus for determining whether to install a modem.

In general, the subscriber modem of an asymmetric optical subscriber transmitter (hereinafter, referred to as ADSL) is configured to transmit and receive voice calls and ADSL data using one line from a telephone line. Although synchronous data communication is used, in the ADSL data transmission / reception mode, asynchronous data communication is performed to transmit and receive a large amount of data and transmit and receive data of about 8 Mbps upwards and about 1 Mbps downwards.

By the way, when the ADSL subscriber modem is installed, if the subscriber modem is not installed after the subscriber modem is installed, the operation is not performed due to a line problem, or whether the operation is not performed due to a problem of the modem. It becomes very difficult. Therefore, in this case, a problem arises that requires a lot of time and effort to solve the problem.

The present invention has been made to solve the problems of the prior art as described above, the object of which is to measure the state of the line from the standpoint of the modem before the subscriber modem of the asymmetric optical subscriber transmission device (ADSL) in the field of the subscriber line The present invention provides a subscriber modem line test apparatus that enables the rapid installation of a modem by checking whether there is an abnormal state and determining whether or not the modem is installed.

1 is a block diagram showing the configuration according to an embodiment of a subscriber modem line test apparatus to which the present invention is applied.

<Description of Symbols for Main Parts of Drawings>

10: pattern generator 20: ASDL function block

30: ATM function block unit 40: line state determination unit

50: external interface unit

According to a feature of the present invention for achieving the above object, in the subscriber modem line test apparatus for measuring a line state by connecting to a line to install a modem of an asymmetric optical subscriber transmission device (ADSL);

A pattern generating unit provided in the telephone station system (DSLAM) to generate a test pattern, and linked to the telephone station system (DSLAM) to receive ASDL pattern data from the pattern generating unit, and to receive information such as upstream rate, downstream rate, and noise margin. Comprehensive line status is determined by comparing a receiving ASDL function unit, a memory unit storing a reference pattern to be received by the ASDL function unit, and a pattern received from the ASDL function unit and a reference pattern stored in the memory unit. Provided is a subscriber modem line test apparatus configured to include a line state determination unit and a line state display unit for informing a user of the result determined by the line state determination unit.

As a result, in the present invention, to check the overall state on the line to install the ADSL subscriber modem, the function block having a function similar to that of the ADSL modem is set, and the collected line information can be viewed through an external notebook or the like.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing the configuration of an embodiment of a subscriber modem line test apparatus of the present invention.

Referring to Fig. 1, reference numeral 10 denotes a pattern generator that is provided in the telephone station system DSLAM to generate a test pattern. At this time, the pattern generator 10 generates a predetermined test data, and periodically different ATM cells (Cell) are generated repeatedly.

In addition, reference numeral 20 is an ASDL function block linked to the telephone station system DSLAM to receive ASDL pattern data generated from the pattern generator 10 through a telephone line and receive information such as upstream rate, downstream rate, noise margin, and the like. 30 represents an ATM function block that analyzes the received ATM cell and checks whether an ATM cell having a certain pattern is input periodically.

Further, reference numeral 40 denotes a line state determination unit that determines whether there is an abnormality in a line state according to signals of the ASDL function block unit 20 and the ATM function block unit 30, and 50 denotes the line state determination unit 40. In order to inform the user of the result determined by the external interface connected to the external display device.

At this time, the line state determination unit 40 is provided with a memory (not shown) that stores the reference pattern of the pattern to be received by the ASDL function block unit 20, received by the ASDL function block unit 20 The pattern and the reference pattern stored in the memory (not shown) are compared to determine whether there is an abnormality in the line state.

Referring to the operation of the present invention having the configuration as described above are as follows.

The apparatus to which the present invention is applied is provided with a port for receiving ADSL pattern data from a telephone line, wherein the ADSL pattern data of the pattern generator 10 input through the telephone line is ADSL through the ADSL function block unit 20. Channel Mux / Demux process, Framing / Deframing process, DMT modulation process, A / D or D / A conversion process, and filtering process.

Thereafter, the ADSL pattern data is input to the ATM function block unit 30. The ATM function block unit 30 receives an ATM cell of an interface output from the multiplexer, and performs 4B / 5B coding / decoding process, HEC check and generation. Transmission is performed through a processing process and an NRZ / NRZI coding / decoding process.

Thereafter, the line state determination unit 40 determines whether there is an abnormality in the line state according to the signals of the ASDL function block unit 20 and the ATM function block unit 30, and in the ASDL function block unit 20. By comparing the received pattern with the reference pattern stored in the memory (not shown), it is determined whether there is an abnormality in the line state, and informs the user whether or not the subscriber modem can be installed. That is, the determination result is provided to an external display device such as a notebook through the external interface unit 50 to inform the user of the result determined by the line state determination unit 40. At this time, when the display device informs the determination result, it is possible to simply display the abnormal state of the line state by using the LED, or to show the abnormality through a message.

As a result, the present invention collects the received ADSL pattern data, extracts ADSL related data such as data rate and SNR margin that can be supported by the subscriber modem, and compares the collected data with the existing line data. The abnormality of the track condition is determined. That is, by using the apparatus of the present invention having a function similar to that of the ADSL subscriber modem which has already been verified, it is possible to determine how much performance the modem to be used can actually support by testing in the place where the ADSL subscriber modem is installed. It is possible to determine the state even if the installation is impossible beyond the state of the track. In addition, various performance-related data that can be serviced through the corresponding line can be extracted.

As described above, the subscriber modem line test apparatus of the present invention measures the state of the line from the standpoint of the modem before installing the ADSL subscriber modem in the field, thereby providing a comprehensive judgment data on the state of the line to quickly install the modem. There is an effect that becomes possible.

Claims (1)

Claims [1] A subscriber modem line test apparatus for measuring a line state by connecting a modem of an asymmetric optical subscriber transmitter (ADSL) to a line to be installed; A pattern generator which is provided in a telephone station system (DSLAM) and generates a test pattern; An ASDL function unit which is linked to the telephone station system (DSLAM) and receives ASDL pattern data from a pattern generator and receives information such as upstream rate, downstream rate, noise margin, etc .; A memory unit storing a reference pattern to be received by the ASDL function unit; A line state determination unit for comparing a pattern received from the ASDL function unit with a reference pattern stored in the memory unit to determine whether there is an abnormal state of the line state; And a line state display unit for informing a user of the result determined by the line state determination unit.