WO2012088908A1 - Management method, system and access node for user line - Google Patents

Abstract

Provided are a management method, a system and an access node for a user line, which belong to the field of communication technology. The system in embodiments of the present invention comprises: user front-end equipment, an access node and a network access server. The access node receives a line parameter sent by the user front-end equipment, which line parameter is the line parameter of a physical line connecting the user front-end equipment to the access node. The access node configures a virtual logic line corresponding to the physical line, according to the physical line between the access node and the user front-end equipment, and allocates the line parameter of the physical line to the corresponding virtual logic line. The access node sends an access control protocol for the line parameter of the virtual logic line to the network access server. The embodiments of the present invention can perform the management of a physical user line and the user service by the way of a virtual logic line. For example, an accurate positioning of the user can be achieved by means of the method of the present invention.

Description

 User line management method, system and access node The application is submitted to the Chinese Patent Office on December 31, 2010, and the application number is 201010623227. 3. The invention name is "user line management method, system and access node". Priority of Chinese Patent Application, the entire contents of which is incorporated herein by reference. Technical field

 The present invention relates to the field of communications technologies, and in particular, to a user line management method, system, and access node. Background technique

 The network topology of the existing multi-user access system may be as shown in FIG. 1. The user (computer or telephone) may be connected to the lj AN (Access Node, access node) through a CPE (Customer Premises Equipment). ). As shown in Figure 1, the AN is connected to a NAS (Network Access Server) and the NAS is connected to a RADIUS server (authentication server).

 The existing access control protocol, such as the Access Node Control Protocol (ANCP), provides a channel for transmitting control information between the AN and the NAS, so that the access control protocol is adopted between the AN and the NAS. (For example, ANCP protocol) Complete message interaction to implement topology discovery, line configuration, 0AM detection, and batch transaction processing for access user ports.

 The dynamic topology discovery policy of the ANCP protocol is delivered as an example. The data interaction process between the AN and the NAS is as shown in Figure 2:

 First, the AN establishes an ANCP neighbor with the NAS.

 Step 1: The AN sends a PORT UP message, where the PORT UP message includes at least an active line ID (Access-Loop-Circuit-ID), a line system (such as ADSL), and an uplink and downlink bandwidth.

 Step 2. After receiving the PORT UP message, the NAS records the parameters in the PORT UP message.

 Step 3: When the user terminal sends a user online request to the AN through the CPE, the AN adds the 0ption82/PPPoE+ of the physical line connecting the CPE to the user online request. Because the AN can connect multiple CPEs, different CPEs can be identified by 0ption82/PPPoE+, so that the AN can know the link used by the CPE currently requesting connection.

Step 4: The AN sends the user online request with 0ption82/PPPoE+ to the NAS. After the NAS obtains the 0ption82 information or the PPPoE line and line standard, the NAS compares it with the pre-stored Access-Loop-Circuit-ID. Match; if the match is successful, jump to step 6; if the match fails, the step ends.

 The match with the pre-stored Access-Loop-Circuit-ID is to verify whether the line is a line that is allowed to access.

 Step 5: The NAS reports the information of the line to the RADIUS server through the RADIUS authentication request packet. Step 6: The RADIUS server notifies the NAS corresponding management parameters through the authentication acceptance message according to the parameters and line types reported by the NAS.

 Step 7. The NAS forwards the received management parameters to the AN, so that the AN adjusts the corresponding line parameters.

 Step 8. The AN returns the online response to the user.

 Management parameters can be used for physical line management and service management. Physical line management includes: dynamic topology discovery, line parameter configuration, line detection management, etc. Service management includes: multicast control, batch transaction processing, and so on. Of course, these management are just examples.

 In the process of implementing the present invention, the inventors have found that the prior art has at least the following problems:

 The RADIUS server or NAS server can manage and control the AN through the existing access control protocol (such as the ANCP protocol), but the user line between the AN and the CPE cannot be managed or located, so the management accuracy is poor. Summary of the invention

 The present invention provides a user line management method, system, and access node, in order to solve the problem that the RADIUS server or the NAS server cannot manage the CPE user line in the prior art. The technical solutions are as follows:

 The embodiment of the invention provides a method for managing a subscriber line, including:

 Receiving, by the user front end device, a line parameter, where the line parameter is a line parameter of a physical line connecting the user front end device and the access node;

 Setting a virtual logic line corresponding to the physical line according to a line parameter of the physical line between the access node and the user front end device, and configuring a line parameter of the physical line to a corresponding virtual logic line; The line parameters of the virtual logic line are sent to the network access server.

 An embodiment of the present invention further provides an access node, including:

 a receiver, configured to receive a line parameter sent by a user front end device, where the line parameter is a line parameter of a physical line connected to the access node by the user front end device;

Corresponding module, configured to correspond to a physical line setting between the access node and the user front end device Virtual logic circuit, and configuring line parameters of the physical line to corresponding virtual logic lines;

 A transmitter, configured to send line parameters of the virtual logical line to the network access server.

 The embodiment of the present invention further provides a user line management system, including: a user front end device, an access node, and a network access server;

 The user front end device is connected to the access node by using a physical line, and is configured to send the line parameter of the physical line to the access node;

 The access node is configured to set a virtual logical line corresponding to the physical line, and configure the same line parameter of the physical line to a corresponding virtual logical line; and use the access control protocol to the virtual logic The line parameters of the line are sent to the network access server.

 By implementing the foregoing embodiments of the present invention, an access node may receive line parameters of a physical line of a user front-end device, and virtualize the physical line by means of a virtual logical line, so that the network access server or the authentication server can acquire all connected users. The line parameters of the physical line of the front-end device. Therefore, the embodiment of the present invention does not need to improve the existing access control protocol, that is, the physical line of the user can be managed and controlled by means of a virtual logical line. For example, precise positioning of the user can be achieved by the method of the embodiment of the present invention. DRAWINGS

 In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly described below. It is obvious that the following figures are merely some embodiments of the present invention, which are common to the art. For the skilled person, other drawings can be obtained from these drawings without any creative work.

 1 is a topological structural diagram of an existing multi-user access system;

 2 is a data exchange process of an ANCP protocol between an existing AN and a NAS;

 3 is a schematic flow chart of a first embodiment of the present invention;

 4 is a schematic flow chart of a second embodiment of the present invention;

 Figure 5 is a schematic structural view of a third embodiment of the present invention;

 Figure 6 is a schematic structural view of a fourth embodiment of the present invention;

 Figure 7 is a schematic structural view of a fifth embodiment of the present invention;

 Figure 8 is a schematic view showing the structure of a sixth embodiment of the present invention. detailed description

In order to make the objects, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described below with reference to the accompanying drawings Further details are described. Example 1

 The first embodiment of the present invention provides a method for managing a subscriber line, and the process thereof is as shown in FIG. 3, including: Step 101: Receive a line parameter sent by a user front end device, where the line parameter is the user front end device and the connection The line parameters of the physical line connected to the node;

 Step 102: Set a virtual logic line corresponding to the physical line according to a line parameter of the physical line between the access node and the user front-end device, and configure a line parameter of the physical line to a corresponding virtual logic. Line

 Step 103: Send the line parameters of the virtual logical line to the network access server by using an access control protocol. The access node in the embodiment of the present invention can receive the line parameters of the physical line of the user front-end device, and virtualize the physical line by means of the virtual logical line, so that the network access server or the authentication server can obtain all connected user front-end devices. Line parameters of the physical line. Therefore, the embodiment of the present invention does not need to improve the existing access control protocol, that is, the physical line of the user can be managed and controlled by means of a virtual logical line. For example, accurate positioning of the user can be achieved by the method of the embodiment of the present invention. Example 2

 The second embodiment of the present invention proposes a management method of a subscriber line, which is improved on the basis of the foregoing first embodiment. In the embodiment of the present invention, the AN can communicate with the CPE through the LLDP protocol (Link Layer Discovery Protocol) and communicate with the NAS through the ANCP protocol. Of course, this is only an example of the embodiment of the present invention, and other protocols may be applied to the embodiment of the present invention.

 The AN establishes a connection with the CPE through the LLDP protocol in advance; and establishes a connection with the NAS through the ANCP protocol in advance. LLDP is a proximity discovery protocol that allows nodes in the network to advertise their presence to other nodes and store information sent by all neighboring devices. In this way, after the association between the CPE and the AN through LLDP, the AN can know the information of the CPE connected to each port.

 The process of the embodiment of the present invention may be as shown in FIG. 4, including:

 Step 201: The CPE sends the line parameters of the physical line connected to the AN to the AN through the LLDP protocol.

 Step 202: The AN sets a virtual logic line corresponding to the physical line according to the physical line between the AN and the CPE, and configures the same line parameter of the physical line to the corresponding virtual logic line.

Specifically, the step 202 can be: Step 2021: The AN virtualizes multiple virtual logical lines on the interface connected to the CPE side, and sets a virtual logical line corresponding to each physical line, and each virtual logical line has a unique ID.

 Step 2022: After receiving the line parameter of the physical line sent by the CPE through the LLDP protocol, the AN configures the line parameter of the physical line to the corresponding virtual logical line.

 Step 203: The AN sends the line parameter of the virtual logical line to the NAS through the ANCP protocol.

 The step 203 may specifically include:

 Step 2031: After receiving the online request sent by the CPE, the AN determines, according to the line identifier in the online request of the user, the physical line that sends the online request of the user, and determines the ID of the virtual logical line corresponding to the physical line. And the line parameters of the virtual logic line;

 Step 2032: The AN sends the ID of the virtual logical line and the corresponding line parameter to the NAS through the ANCP protocol. Further, in order to verify the validity of the physical line, the step 203 may further include: Step 203: The AN sends a PORT UP message to the NAS, where the PORT UP message may include at least one of the following: an active line ID ( Access-Loop-Circuit-ID), line format (such as ADSL), uplink and downlink bandwidth.

 Step 203b: When the UE sends a user online request to the CPE, the CPE adds the line identifier of its physical line to the user online request and forwards it to the AN. The line identifier may be 0ption82 or PPPoE+ information of the physical line.

 Step 203c: After receiving the online request, the AN determines the physical line corresponding to the line identifier of the physical line, and determines the ID of the virtual logical line corresponding to the physical line by the correspondence between the physical line and the virtual logical line. And the line parameters corresponding to the ID.

 Step 203: The AN sends the ID and line parameters of the virtual logical line to the NAS. The NAS can verify the validity of the line according to the pre-stored Access-Loop-Circuit-ID. If the verification fails, the step ends.

 The 203a and the step 203d may adopt the method in the prior art, which is not limited by the embodiment of the present invention. The difference between step 203a-step 203d and step 2031 and step 2032 is that the NAS also verifies the validity of the physical line.

 When the NAS receives the ID and line parameters of the virtual logical line sent by the AN, the NAS can accurately locate the user. Of course, the precise positioning of the user can also be performed on the RADIUS server, that is, the embodiment of the invention may further include:

Step 204: The NAS reports the ID of the virtual logical line and the corresponding line parameter to the RADIUS server. The NAS can add the line parameters to the existing user authentication accounting request and send it to the RADIUS server. In the above embodiments, user positioning can be performed through a NAS or a RADIUS server. BP: The operator can locate each virtual logical line on the NAS or RADIUS server, and accurately locate the user equipment through the correspondence between the virtual logical line and the physical line. Precise positioning means that the operator can know the physical circuit corresponding to each virtual logic line to make the virtual logic line have a one-to-one correspondence with the user.

 Further, the embodiment of the present invention can also implement precise line management on the physical line of the CPE, that is, the method further includes:

 Step 205: Receive a management parameter that is returned by the NAS for the virtual logical line, and send the management parameter to the CPE corresponding to the virtual logical line by using the LLDP protocol, so that the CPE modifies the line parameter of the physical line according to the management parameter.

 In the embodiment of the present invention, the RADIUS server or the NAS can generate the line management parameters to implement the RADIUS server or the NAS server to control the physical line of the CPE, so that the CPE dynamically adjusts the line parameters of the physical line according to the management parameters, thereby improving the management precision. The management parameter may be generated by the RADIUS server or the NAS server according to the line parameters, and sent by the NAS server to the AN through the ANCP protocol.

 In the embodiment of the present invention, the AN can send the received management parameters to the CPE through the LLDP protocol, so that the CPE can dynamically adjust the line parameters of the physical line to implement precise control of the user front-end equipment. Example 3

 A third embodiment of the present invention provides an access node, and its structure is as shown in FIG. 5, including:

 The receiver 1 is configured to receive a line parameter sent by a user front end device, where the line parameter is a line parameter of a physical line connected between the user front end device and the access node;

 Corresponding module 2, configured to set a virtual logical line corresponding to a physical line between the access node and the user front-end device, and configure the same line parameter of the physical line to a corresponding virtual logical line; 3. It is used to send the line parameters of the virtual logical line to the network access server.

The access node in the embodiment of the present invention can receive the line parameters of the physical line of the user front-end device, and virtualize the physical line by means of the virtual logical line, so that the network access server or the authentication server can obtain all connected user front-end devices. Line parameters of the physical line. Therefore, the embodiment of the present invention does not need to improve the existing access control protocol, that is, the physical line of the user can be managed and controlled by means of a virtual logical line. For example, precise positioning of the user can be achieved by the method of the embodiment of the present invention. Example 4 The fourth embodiment of the present invention proposes an access node which is improved on the basis of the foregoing third embodiment. The fourth embodiment of the present invention is the same as the LLDP protocol and the ANCP protocol. The structure of the fourth embodiment of the present invention can be as shown in FIG. 6, and includes:

 The receiver 1 is configured to receive a line parameter sent by the CPE through the LLDP protocol, where the line parameter is a line parameter of a physical line connected between the CPE and the AN;

 Corresponding module 2, configured to set a corresponding virtual logical line according to a physical line between the CPE and the AN, and configure the same line parameter of the physical line to the corresponding virtual logic line;

 Specifically, the corresponding module 2 may include:

 The virtual unit 21 is configured to virtualize multiple virtual logical lines on the interface connected to the CPE side, and set a virtual logical line corresponding to each physical line, and each virtual logical line has a unique ID;

 The configuration unit 22 is configured to: after receiving the line parameter of the physical line sent by the CPE through the LLDP protocol, configure the line parameter of the physical line to the corresponding virtual logic line.

 The transmitter 3 is configured to send the line parameter of the virtual logical line to the network access server by using an ANCP protocol. The transmitter 3 can be as shown in FIG. 4, and includes:

 The determining unit 31 is configured to: after receiving the user online request sent by the CPE, determine, according to the line identifier in the online request of the user, a physical line that sends the online request of the user, and determine an ID of the virtual logical line corresponding to the physical line. And the line parameters of the virtual logic line;

 The parameter sending unit 32 is configured to send the ID of the virtual logical line and the corresponding line parameter to the hall through the ANCP protocol.

 Specifically, the transmitter 3 can also verify the validity of the physical line by using the steps in the foregoing step 203a to step 203d in the second embodiment, and details are not described herein again.

 When the NAS receives the ID and line parameters of the virtual logical line sent by the AN, the NAS can accurately locate the user. Of course, precise positioning of users can also be performed on the RADIUS server. In the embodiment of the invention, the NAS reports the ID of the virtual logical line and the corresponding line parameter to the RADIUS server. The NAS can add the line parameters to the existing user authentication accounting request and send it to the RADIUS server.

 In the above embodiment, user positioning can be performed through a NAS or a RADIUS server. BP: The operator can locate each virtual logical line on the NAS or RADIUS server, and accurately locate the user equipment through the correspondence between the virtual logical line and the physical line. Precise positioning means that the operator can know the physical circuit corresponding to each virtual logic line, and the virtual logic line has a one-to-one correspondence with the user.

In another embodiment of the present invention, precise line management can be implemented for the physical line of the CPE, that is, the connection The ingress node is shown in Figure 6, and also includes:

 Returning to the module 4, configured to receive the management parameter returned by the NAS for the virtual logical line, and send the management parameter to the CPE corresponding to the virtual logical line by using the LLDP protocol, so that the CPE modifies the physical line according to the management parameter. Line parameters.

 The AN in the embodiment of the present invention may send the received management parameters to the CPE through the LLDP protocol, so that

The CPE can dynamically adjust the line parameters of the physical line to achieve precise control of the user's front-end equipment.

 It should be noted that: the foregoing third and fourth embodiments are only exemplified by the division of the above functional modules. In practical applications, the function allocation may be completed by different functional modules according to requirements, that is, the internal structure of the device is divided. Different functional modules to perform all or part of the functions described above. The third and fourth embodiments described above are the same as those of the first and second embodiments; therefore, the same portions will not be described again. Example 5

 A fifth embodiment of the present invention provides a management system for a subscriber line, and the structure thereof is as shown in FIG. 7, including: a user front end device 301, an access node 302, and a network access server 303;

 The user front end device 301 is connected to the access node by using a physical line, and is configured to send the line parameter of the physical line to the access node 302;

 The access node 302 is configured to set a virtual logical line corresponding to the physical line, configure the same line parameter of the physical line to a corresponding virtual logical line, and send the line parameter of the virtual logical line to the network. Access server 303.

 The access node in the embodiment of the present invention can receive the line parameters of the physical line of the user front-end device, and virtualize the physical line by means of the virtual logical line, so that the network access server or the authentication server can obtain all connected user front-end devices. Line parameters of the physical line. Therefore, the embodiment of the present invention does not need to improve the existing access control protocol, that is, the physical line of the user can be managed and controlled by means of a virtual logical line. For example, accurate positioning of the user can be achieved by the method of the embodiment of the present invention. Example 6

The sixth embodiment of the present invention proposes a management system for a subscriber line, which is improved on the basis of the foregoing fifth embodiment. The sixth embodiment of the present invention is similar to the foregoing second and fourth embodiments. The LLDP protocol and the ANCP protocol are also taken as an example for description. The method includes: a user front end device 301, an access node 302, and a network access server 303; The user front end device 301 is connected to the access node through a physical line, and is used to send the line parameter of the physical line to the access node 302 through the LLDP protocol;

 The access node 302 is configured to set a virtual logical line corresponding to the physical line, configure the same line parameter of the physical line to a corresponding virtual logical line, and connect the virtual logical line by accessing an ANCP protocol. The line parameters are sent to the network access server 303.

 In a specific example of the present invention, the access node 302 may be the access node as described in the third and fourth embodiments described above. Further, the access node 302 can also verify the validity of the physical line by using the steps in the foregoing step 203a to step 203d in the second embodiment, and details are not described herein again.

 In the system of the embodiment of the present invention, when the NAS receives the ID and line parameters of the virtual logical line sent by the AN, the user can accurately locate the user. Of course, precise positioning of the user can also be performed on the RADIUS server 304. That is, the structure of the system of the embodiment of the invention may further be as shown in FIG. 8, and further includes a RADIUS server 304. The RADIUS server 304 is configured to receive the ID of the virtual logical line of the NAS 303 and corresponding line parameters. The NAS 303 can add the line parameters to the existing user authentication charging request and send it to the RADIUS server 304.

 In the above embodiment, user positioning can be performed through the NAS 303 or RADIUS 304 server. BP: The operator can locate each virtual logical line on the NAS303 or RADIUS server 304, and accurately locate the user equipment through the corresponding relationship between the virtual logical line and the physical line. Precise positioning means that the operator can know the physical line corresponding to each virtual logic line to carry out the virtual logic line and the accessed user.

--correspond.

 In an embodiment of the present invention, accurate line management may be implemented on the physical line of the CPE, that is, the RUDISU server 304 is further configured to receive the ID of the virtual logical line and the corresponding line reported by the network access server. And generating a management parameter according to the line parameter, and sending the parameter to the NAS 303. And the NAS 303 is also used to send the management parameter to the AN302.

 Further, the AN302 is further configured to receive a management parameter that is returned by the NAS 303 according to the line parameter of the virtual logical line, and send the management parameter to the CPE 301 by using an LLDP protocol;

 The CPE 301 is further configured to adjust the physical line according to the received management parameter.

 Of course, the foregoing scenario is only an example of the embodiment of the present invention, and the embodiment of the present invention is not limited thereto. The AN in the embodiment of the present invention can send the received management parameters to the CPE through the LLDP protocol, so that the CPE can dynamically adjust the line parameters of the physical line to implement precise control of the user front-end equipment.

It should be noted that: the fifth and sixth embodiments described above are merely exemplified by the division of the above functional modules, In the inter-application, the above-mentioned function allocation can be completed by different functional modules as needed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. The fifth and sixth embodiments described above are the same as those of the first and second embodiments; therefore, the same portions will not be described again.

 A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to program instructions, and the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed. The steps of the foregoing method embodiments are included; and the foregoing storage medium includes: various media that can store program codes, such as wake up, RAM, disk or optical disk.

 The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., which are within the spirit and scope of the present invention, should be included in the protection of the present invention. Within the scope.

Claims

Rights request  A method for managing a subscriber line, characterized in that:  Receiving, by the user front end device, a line parameter, where the line parameter is a line parameter of a physical line connecting the user front end device and the access node;  Setting a virtual logic line corresponding to the physical line according to a line parameter of the physical line between the access node and the user front end device, and configuring a line parameter of the physical line to a corresponding virtual logic line; The line parameters of the virtual logic line are sent to the network access server. 2. The method according to claim 1, wherein the method further comprises:  Receiving a management parameter of the virtual logical line returned by the network access server, and sending the management parameter to the user front end device, so that the user front end device modifies the line of the physical line according to the management parameter parameter. The method according to claim 1 or 2, wherein the virtual logic line corresponding to the physical line is set according to a line parameter of a physical line between the access node and the user front end device And configuring the line parameters of the physical line to the corresponding virtual logical line includes:  Virtualizing a plurality of virtual logical lines on the interface connected to the front end device side of the user, and setting a virtual logical line corresponding to each physical line, and each virtual logical line has a unique ID;  After receiving the line parameters of the physical line sent by the user front end device, the line parameters of the physical line are configured to correspond to the virtual logic lines. The method according to any one of claims 1 to 3, wherein the transmitting the line parameter of the virtual logic line to the network access server comprises:  After receiving the user online request sent by the user front-end device, determining, according to the line identifier in the online request of the user, a physical line that sends the online request of the user, and determining an ID of the virtual logical line corresponding to the physical line, and the Line parameters of the virtual logic line;  Sending the ID of the virtual logical line and the corresponding line parameter to the network access server. 5. An access node, comprising: a receiver, configured to receive a line parameter sent by a user front end device, where the line parameter is set by the user front end a line parameter of a physical line connected to the access node;  Corresponding module, configured to set a corresponding virtual logic line according to a line parameter of a physical line between the access node and the user front end device, and configure a line parameter of the physical line to a corresponding virtual logic line;  A transmitter, configured to send line parameters of the virtual logical line to the network access server. The access node according to claim 5, wherein the access node further includes: a returning module, configured to receive a management parameter returned by the network access server for a virtual logical line, and Management parameters are sent to the user front end device to cause the user front end device to modify line parameters of the physical line according to the management parameters. The access node according to claim 5 or 6, wherein the corresponding module comprises: a virtual unit, configured to virtualize an interface connected to the front end device side of the user to multiple virtual logical lines, and for each The physical circuit corresponds to a virtual logic line, and each virtual logic line has a unique ID;  The configuration unit is configured to: after receiving the line parameter of the physical line sent by the user front end device, configure the line parameter of the physical line to the corresponding virtual logic line. The access node according to any one of claims 5-7, wherein the transmitter includes: a determining unit, configured to: after receiving a user online request sent by the user front end device, according to The line identifier in the user online request determines a physical line that sends the user online request, and determines an ID of the virtual logical line corresponding to the physical line, and a line parameter of the virtual logical line;  And a parameter sending unit, configured to send the ID of the virtual logical line and the corresponding line parameter access control protocol to the network access server. A user line management system, comprising: a user front end device, an access node, and a network access server;  The user front end device is connected to the access node by using a physical line, and is configured to send the line parameter of the physical line to the access node; The access node is configured to set a virtual logical line corresponding to the physical line, and configure the same line parameter of the physical line to a corresponding virtual logical line; and use the access control protocol to the virtual logic line The system according to claim 9, wherein the authentication server is configured to receive an ID of a virtual logical line and a corresponding line parameter reported by the network access server, and generate a management parameter according to the line parameter. And then sent to the network access server;  The network access server is further configured to send the management parameter to the access node. The system according to claim 10, wherein the access node is further configured to receive the management parameter returned by the network access server, and send the management parameter to the user front end device. The user front end device is further configured to adjust the physical line according to the received management parameter and according to the management parameter.