KR20050002544A - Method for offering attenuation value of a each port in 2-Band VDSL - Google Patents

Abstract

PURPOSE: A method for supplying attenuation value information by port in a 2-band VDSL(Very high-date rate Digital Subscriber Line) is provided to receive a transmit power from a DSL(Digital Subscriber Line) modem to measure an attenuation value of a line, and to supply the measured value to a manager, thereby effectively operating and maintaining a VDSL system. CONSTITUTION: A management system stores standard transmit power by frequency(S21), measures attenuation values(S22), and requests a management object to send transmit power values according to each port(S23). When the transmit power values are inputted(S24), the system obtains usage frequency information of the ports(S25), and retrieves a standard transmit power of the corresponding usage frequency(S26). The system subtracts the standard transmit power of the frequency from the transmit power values of the ports(S27), and estimates a difference(S28), then stores measured time, frequency, and attenuation information(S29). If an attenuation average value or a sum of certain times is requested(S30), the system calculates the average value and the sum, and supplies the calculated results to a management support system or a manager(S31).

Description

Method for providing attenuation information per port in 2-band high speed digital subscriber line {Method for offering attenuation value of a each port in 2-Band VDSL}

The present invention relates to a two-band high-speed digital subscriber line (VDSL), and more particularly to a method for providing attenuation amount as information for maintenance to the system operator by measuring the attenuation amount per port.

Most of the 2-band ultra-high-speed digital subscriber line (VDSL) source chipsets introduced at over one million scale do not provide quality parameters for maintenance. Most VDSL source chipsets are manufactured overseas, and since they are imported and implemented in Korea, it is very difficult to grasp information not provided by the source chipset at the system level. Therefore, when providing a high-speed digital subscriber line (VDSL) service using a two-band high-speed digital subscriber line system, the information for the operation or maintenance is absolutely lacking.

In particular, the attenuation value recommended as mandatory in IEFT's asymmetric digital service line standard management information base (MIB) or high-speed digital service line draft is operation information that can determine the degree of attenuation of the line that is not system dependent. As a basic track determination data that can be used to determine a connection failure, track aging, failure, and the like.

However, as mentioned above, the two-band VDSL system does not provide such attenuation information, and thus there is a problem in that the system operation maintenance is not smooth.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and an object thereof is to provide a method for providing attenuation information for each port for operation and maintenance of a two-band ultra high speed digital subscriber line system.

1 is a block diagram showing a two-band ultra-high speed digital subscriber line system to which the present invention is applied;

2 is an operation flowchart illustrating a method for providing attenuation information for each port in a two-band ultra-high speed digital subscriber line according to an embodiment of the present invention.

<Brief description of symbols for the main parts of the drawings>

110; Home network 120; Network termination device

130; Access network 140; Broadband network

150; Element management system 160; Network management system

171, 172, 173; Management Support System

A method for providing attenuation information for each port in a two-band ultra-high speed digital subscriber line according to the present invention for achieving the above object, in the ultra-high speed digital subscriber line system, by receiving the transmission power from the digital subscriber line modem to measure the attenuation of the line In the method of providing attenuation information provided to the manager,

A database construction step of storing standard transmission power before backoff for each frequency;

A transmission power value acquiring step of acquiring actual transmission power information after backoff for each subscriber port from the digital subscriber line modem;

Obtaining a standard transmit power value for searching for a standard transmit power corresponding to a frequency used by the subscriber port for each subscriber port;

An attenuation amount obtaining step of obtaining attenuation amount by calculating a difference value between the actual transmission power value and the standard transmission power value for each subscriber port;

And attenuation amount storage step of storing measurement time, frequency, and attenuation amount information for each subscriber port.

According to the present invention, there is provided a computer-readable recording medium having recorded thereon a program for executing the method of providing attenuation information for each port as described above in a two-band ultra-fast digital subscriber line management system.

Hereinafter, a method of providing attenuation information for each port in a two-band ultra high speed digital subscriber line according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The information provided by the 2-band ultra-high speed digital subscriber line system to which the present invention is applied includes only the speed, signal-to-noise ratio (SNR), transmission power, interleaved delay value, and Reed-Solomon error value, and the IETF standard or ultra-high speed of asymmetric digital subscriber line. The various quality information required by the digital subscriber line draft cannot be provided.

This quality-related information includes attenuation value, errored second (ES), loss of signal (LOS), loss of frame (LOF), and loss of power (LPR). And it is important to operate. Thus, in the case of an asymmetric digital subscriber line (ADSL), this quality-related information is provided in real time in conjunction with a higher network management system (NMS).

However, the two-band high-speed digital subscriber line does not provide all the quality-related information. In the present invention, the attenuation value is extracted and provided using only the items and functions provided by the two-band high-speed digital subscriber line. Suggest a solution.

Here, the attenuation value (attenuation value) is defined in the IETF RFC2662, a difference value between the transmission power and the reception power between subscriber modems (xTU-R), and is an integer value that can identify the loss characteristics of the line. Here, in the case of the normal line, the attenuation amount is the same in the line of the same length and condition. This attenuation information can be used to infer a bad track when operating and maintaining the track. In other words, by querying the current attenuation of neighboring subscribers in the same distance and the same line, it can be inferred for the subscriber with a large attenuation due to the connection failure of the intermediate terminal box, the old or home line defects and the construction failure.

1 is a block diagram showing a two-band ultra-high speed digital subscriber line system to which the present invention is applied. The high-speed digital subscriber line system includes a network terminal device (NT) 120 connected to each subscriber's home network 11 and an access network (AN) for connecting the network terminal device 120 to the broadband network 140. network (130), an element management system (EMS) 150 and a network management system (NMS) 160 for managing the network termination device 120 and the access network 130, A plurality of operating support systems (OSS) (171, 172, 173) for collecting necessary information from the network management system 160 to perform subscriber management, operation management, failure management and the like is provided.

Here, the network termination device 120 includes a physical object 121, a switch object 122, a data transceiver (xTU-R) 123, and a management object 124. In addition, the access network 130 includes a physical object 131, a switch object 132, a data transmitter (xTU-C) 133, and a management object 134.

The access network 130 and the network termination apparatus 120 measure a transmission power (TxPSD) for a frequency used for each subscriber port, and transmit a signal with the measured transmission power. In this case, the transmission power is a value measured based on the loss according to the electrical line length in the standard transmission power PSDD (f) for each frequency, and in the present invention, the attenuation value is determined by using the transmission power TxPSD. Calculate

The present invention is implemented in the element management system 150 or the network management system 160, which measures the attenuation value and provides it to the upper management support system (171, 172, 173).

2 is an operation flowchart illustrating a method for providing attenuation information for each port in a two-band ultra-high speed digital subscriber line according to an embodiment of the present invention.

First, the management system stores the standard transmission power (PSDREF (f)) for each frequency (S21). Then, in order to measure the amount of attenuation (S22), the transmission power value is requested for each port from the management object of the lower access network or the network termination apparatus (S23). When the transmission power value is input for each port (S24), the frequency information of the corresponding port is obtained (S25), and the standard transmission power of the corresponding frequency is searched (S26).

Subsequently, the standard transmission power of the corresponding frequency is subtracted from the transmission power value for each port input from the management object (S27), and the difference value is estimated as an attenuation amount (S28). The measurement time, frequency, and attenuation information are stored for each subscriber port (S29).

Thereafter, when a higher attenuation amount of a specific frequency or a sum for a predetermined time is requested from a higher level management support system or administrator (S30), the average value and sum are calculated using the stored attenuation amount information and provided to the management support system or the manager. (S31).

As described above, the reason why the difference between the transmission power value of each port and the standard transmission power of the corresponding frequency can be estimated as the attenuation amount will be described.

Currently, two-band high-speed digital subscriber line system provides power back-off power spectral density (PSD) as an essential item. PBO PSD is a function to minimize FEXT between the same systems in the ultra high-speed digital subscriber line system, and transmits different transmission signal size according to distance.

That is, in the case of a two-band ultrafast digital subscriber line, VTU-R calculates the loss (LOSS (kl0, f) in) according to the electrical line length of VTU-R and VTU-C when calculating transmission power for upstream. The transmission power (TxPSD) is obtained by backing off the PSD based on dB).

That is, the transmission power (TxPSD) measured by the VTU-R is the standard transmission power (PSDREF (f)) standardized for each frequency when the line loss is assumed to be 0, and the loss according to the electric line distance (LOSS (kl0, f) in dB). Since the loss (LOSS (kl0, f) in dB) according to the electric line distance means the loss in the line, it can be estimated as the attenuation amount. Therefore, the attenuation amount information can be obtained by subtracting the standard transmission power from the actual transmission power. That is, since the power transmitted as a result of the backoff directly reflects the loss of each subscriber line, it is possible to extract the line attenuation of the subscribers in different locations by comparing the power levels before and after the backoff. .

For example, if the transmission power at a particular frequency is -80 dBm / Hz and the standard transmission power at that frequency is -60 dBm / Hz, then the line attenuation at this time is -20 dBm / Hz.

As described above, if information is accumulated by measuring attenuation by frequency, the attenuation amount is larger than other subscribers by calculating the sum or average value of the attenuation based on the information accumulated during the operation and maintenance of the ultra high-speed digital subscriber line subscriber port. It is possible to provide the appropriate service to the subscriber by delaying the connection of the intermediate terminal box, the deterioration of the track and the defection of the indoor track, and the like, thereby improving customer satisfaction.

While the invention has been described above based on the preferred embodiments thereof, these embodiments are intended to illustrate rather than limit the invention. It will be apparent to those skilled in the art that various changes, modifications, or adjustments to the above embodiments can be made without departing from the spirit of the invention. Therefore, the protection scope of the present invention will be limited only by the appended claims, and should be construed as including all such changes, modifications or adjustments.

As described above, according to the present invention, since the attenuation amount information for each port for operation and maintenance of the system can be measured and provided, there is an advantage in that the operation and maintenance of the 2-band ultra-high speed digital subscriber line system can be efficiently executed.

Claims (3)

In the ultra-high speed digital subscriber line system, attenuation information providing method for receiving the transmission power from the digital subscriber line modem to measure the attenuation of the line to provide to the administrator, A database construction step of storing standard transmission power before backoff for each frequency; A transmission power value acquiring step of acquiring actual transmission power information after backoff for each subscriber port from the digital subscriber line modem; Obtaining a standard transmit power value for searching for a standard transmit power corresponding to a frequency used by the subscriber port for each subscriber port; An attenuation amount obtaining step of obtaining attenuation amount by calculating a difference value between the actual transmission power value and the standard transmission power value for each subscriber port; And attenuation amount storage step of storing measurement time, frequency, and attenuation amount information for each subscriber port. The method of claim 1, Repeating the transmission power value acquisition step or the attenuation amount storage step at regular intervals, When the average or sum of the attenuation amount in a specific subscriber port or line for a specific time is requested from the manager, the average or sum of the attenuation amount for the requested time is calculated and provided to the manager. How to provide attenuation information for each port of the port. In the high speed digital subscriber line management system, A database construction step of storing standard transmission power before backoff for each frequency; A transmission power value acquiring step of acquiring actual transmission power information after backoff for each subscriber port from the digital subscriber line modem; Obtaining a standard transmit power value for searching for a standard transmit power corresponding to a frequency used by the subscriber port for each subscriber port; An attenuation amount obtaining step of obtaining attenuation amount by calculating a difference value between the actual transmission power value and the standard transmission power value for each subscriber port; A computer-readable recording medium having recorded thereon a program for executing the method of providing attenuation information for each port, including attenuation amount storage step of storing the measurement time, frequency and attenuation amount information for each subscriber port.