CN100454954C

CN100454954C - Fast initializing method for asymmetric digital user loop local side apparatus

Info

Publication number: CN100454954C
Application number: CNB021112509A
Authority: CN
Inventors: 李建中; 余伟; 潘雄
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2002-03-30
Filing date: 2002-03-30
Publication date: 2009-01-21
Anticipated expiration: 2022-03-30
Also published as: CN1449179A

Abstract

The present invention provides a fast initializing method for asymmetric digital user loop local side apparatus, which comprises the following steps: when an ADSL circuit needs initializing, a system judges whether the apparatus is in a continuous operation state, if true, the flow path of fast initialization is carried out; an ADSL control part sends the high-level signals of CTL_RXCS and CTL_TXCS out to realize that the data sending and receiving chip selection of a UTOPIA port of the ADSL is in a prohibited state, wherein the chip selection is in a slave mode; a resetting RESET signal of the ADSL is raised by a CPU; a UTOPIA port of an SAR module, which is in a master mode, and other devices or terminal ports need resetting are reset by the CPU; the CTL_RXCS and the CTL_TXCS are lowered by the CPU after resetting is carried out. The present invention is adopted to realize that initialization is very fast, an ADSL user side does not feel local side initialization, wire break can not occur when data is accessed, and the service quality of ADSL apparatus is greatly improved.

Description

A kind of fast initializing method of ADSL (Asymmetric Digital Subscriber Line) local side apparatus

Technical field

The present invention relates to the fast initializing method of a kind of ADSL (Asymmetric Digital Subscriber Line) (ADSL) local side apparatus, belong to the access technology in the data communication field.

Background technology

In the ADSL local side apparatus, the initialization of equipment generally by being resetted, entire circuit is realized.But because adsl circuit need experience complex processes such as code download, chip self check, local side user side rate adaptation, connection from resetting to operate as normal at present, often beginning from resetting needs time of tens seconds even tens seconds to successful connection, particularly when a plurality of ADSL nest plates adopt progressive download, required time will be the product of nest plate number and single nest plate initialization time.When the adsl equipment electrifying startup first time, these processes must experience, because at this moment also not for the user provides access service, whether length all can be tolerated during this period of time; But, in case when working as device start and being in continuous running status, all may provide the data access service constantly on the adsl equipment for a lot of users, if because universal test between ATM layer and physical layer and operating physical interface (UTOPIA) or SAR module (Segmentation And Reassemble partition and package module) wait other failure cause, system need reset again, so very long initialization time is for the user, just mean and go offline and serve temporary transient interruption, this user be can not put up with, be badly in need of seeking the technical scheme of this type of problem of solution.

In the prior art, to the initialization of ADSL nest plate in the ADSL local side apparatus, normally by the nest plate hardware reset is carried out.This mode is basic initialization flow process, process such as need the download of experience code, chip self check, local side and user side rate adaptation, be connected.The shortcoming of this mode maximum is length consuming time (needing tens seconds even tens seconds), and in whole process, local side apparatus is in init state always, can't provide the data access service for the user.In the system's power up first time, this process is to experience; But when system is in continuous running status, (as universal test and operating physical interface or the SAR module is unusual and other control section fault etc.) for a certain reason, faulty component and unreliable only resets.System need carry out initialization again to adsl equipment, if do not adopted thisly based on the initialization mode that normally resets distinctively, very long initialization time will directly cause all users to go offline, and this is that the user is difficult to tolerate.The initialization time of ADSL shortens and allows the user not go offline if can find a kind of method allow in this case, can improve the failover capability of system greatly.

In order to realize the purpose of fast initialization, at first need solution how to distinguish system and whether be in continuous running status." ADSL access device technical specification YDN068-1998 " and U.S.'s technical specifications such as " ANSI-T1.413 " that the reference information Estate Division is formulated, the initialization of ADSL nest plate generally all needs could arrive stable operating state from resetting through whole very long flow process.If can shorten the initialized time of adsl equipment as far as possible, make in case appearance connects when interrupting, in the time that the user can tolerate, finish initialization procedure, will make very big contribution to the long-term stability operation of system.

Summary of the invention

The technical problem to be solved in the present invention provides a kind of being used for the local side apparatus of ADSL (Asymmetric Digital Subscriber Line) (ADSL) is carried out fast initializing method, this method can shorten the ADSL local side apparatus greatly hindering the initialized once more time of needs for some reason under the running status continuously, solves the problem that resets and cause the user frequently to go offline because of local side apparatus.

The method of ADSL (Asymmetric Digital Subscriber Line) (ADSL) the local side apparatus fast initialization that the present invention proposes may further comprise the steps:

The first step, with transmission and reception (relative main ADSL is a reference point) the chip selection signal RXCS of universal test in each ADSL nest plate and operating physical interface and TXCS respectively through picking out after the resistance serial connection; Described RXCS is meant the reception chip selection signal of universal test and operating physical interface on the ADSL nest plate, and described TXCS is meant the transmission chip selection signal of universal test and operating physical interface on the ADSL nest plate;

In second step,, and add control signal CTL_RXCS at corresponding input with each RXCS signal that picks out and an output of line attachment driver together; Equally each TXCS signal that picks out is handled, and control them with the CTL_TXCS signal;

In the 3rd step, when needs initialization adsl circuit, whether system at first judgment device is in continuous running status, if then enter the fast initialization flow process, otherwise enter common initialization flow process;

The 4th step entered the fast initialization flow process, and CPU sends CTL_RXCS and CTL_TXCS high level signal, the data transmit-receive sheet choosing of the universal test of ADSL nest plate and operating physical interface (being in the pattern from ADSL) is in forbids attitude;

In the 5th step, CPU draws high the RESET signal that resets of ADSL nest plate, avoids ADSL subscriber line circuit broken string;

The 6th step, other device that need reset or ports in the universal test of cpu reset SAR module and operating physical interface (being in the Master pattern) and the system;

In the 7th step, after other devices or port reset finished, CPU dragged down CTL_RXCS and CTL_TXCS, and CPU discharges the RESET control of ADSL nest plate, and whole fast initialization process finishes.

After having adopted the method for the invention, can receive following beneficial effect under continuous running status to the initialization that the ADSL local side apparatus carries out because of cause specific is required:

1) owing to the control of having adopted TXCS and RXCS, at the SAR chip universal test that is operated in master mode and the operating physical interface Shi Buhui that resets is exerted an influence to the universal test and the operating physical interface (from pattern) of ADSL nest plate, the universal test of ADSL and operating physical interface do not need to experience other initialization of reset stage, and the universal test of SAR module and operating physical interface reset, and finish just can operate as normal.

2) owing to do not need the universal test of ADSL nest plate and operating physical interface resetted and just can finish the initialization of universal test and operating physical interface (Slave pattern), the program that has downloaded in the ADSL nest plate does not need to download once more, DSP in the ADSL nest plate and interface chip do not need to carry out again performance test, the MODEM of local side and user side does not need to carry out rate adaptation and be connected once more, the ADSL nest plate is operated in the READY state immediately, has saved the initialization time of adsl equipment greatly.

3) because the initialization procedure of local side ADSL nest plate is very fast, make the initialization that the imperceptible local side of ADSL user side takes place, the data access service can not broken yet, and has improved the service quality QoS of adsl equipment greatly.

Description of drawings

Fig. 1 is that the present invention is used to illustrate the circuit diagram of realizing the ADSL fast initializing method;

Fig. 2 is an ADSL local side fast initialization flow chart of the present invention.

Embodiment

Be further described below in conjunction with the embodiment of accompanying drawing ADSL fast initialization of the present invention.

Fig. 1 is the circuit diagram that the present invention realizes the ADSL fast initializing method, and it provides the hardware controls environment that carries out fast initialization at N ADSL nest plate.The purpose of fast initialization is exactly under the prerequisite of the running status that protects the ADSL unit, and the initialization to the SAR module is realized in the cpu monitor unit.Wherein CPU_IO1 and CPU_IO2 are the IO mouth signal of CPU, control CTL_TXCS and CTL_RXCS respectively after driving through circuit; CTL_RST is the reseting controling signal of ADSL nest plate.

The continuous running status that whether is in the ADSL local side apparatus can detect the running status of ADSL nest plate by CPU element and realize, if CPU can read READY or LINK state from the ADSL nest plate, show that then the ADSL local side apparatus is in continuous running status, otherwise be discontinuous running status.Fast initializing method is treated with a certain discrimination continuous running status and discontinuous running status exactly, for the normal reset initialization of the system implementation under the discontinuous running status, then implements fast initialization for the system that is under the continuous running status.

Behind ADSL local side apparatus electrifying startup, just be in continuous running status, the program that the ADSL subscriber line circuit needs has downloaded among the RAM and has moved, if can be in initialized process, can make full use of these codes, just can remove code from and download and the required process of nest plate self check, thereby shorten whole initialization time.Therefore, the way that the ADSL nest plate is directly resetted is worthless, because it will directly cause losing of ADSL program code.Lose for fear of code, in the fast initialization process, the RESET signal of ADSL nest plate at first should be drawn high (as shown in Figure 1, CTL_RST should be height).

As shown in Figure 1; need carry out initialized unit is universal test and the above upper strata SAR module of operating physical interface; and what need protection is the following unit such as ADSL nest plate of universal test and operating physical interface, and the CPU control module is as the monitoring unit of system.Specify as follows:

Universal test is the high-speed data channel that is connected ADSL nest plate and upper strata SAR module with the operating physical interface, the universal test of ADSL nest plate and operating physical interface are operated in the SLAVE pattern, and the universal test of SAR module and operating physical interface work in the MASTER pattern.In fact, only need the SAR module is resetted this moment, if but just directly reset the SAR module, data on ADSL side universal test and the operating physical interface can get muddled, cause the ADSL nest plate to have to eliminate mistake with the means of hardware reset, this will cause keeping the effort of ADSL program code, and all that has been achieved is spoiled.By analysis, find the ADSL nest plate universal test and operating physical interface definition RXCS and these two chip selection signals of TXCS.As shown in Figure 1, the present invention has utilized this two signals, when the SAR module initialization, by CPU control the RXCS of all ADSL nest plates and TXCS signal is drawn high, after the universal test of SAR module and operating physical interface initialization finish, again they are dragged down to return on the normal condition.For the ADSL nest plate that does not define these two signals of RXCS and TXCS, can realize by the method that hardware logic makes universal test and operating physical interface IP address bus be in high-impedance state during initialization.Processing through such has solved the data perturbation on universal test and the operating physical interface.

Fig. 2 is an ADSL local side apparatus fast initialization flow chart, and it has described the process of fast initialization.As shown in Figure 2, when the ADSL local side apparatus needs initialization for some reason, need at first to judge whether the ADSL local side apparatus is in continuous running status, if not, illustrative system is the init state that is in standard, then enters standard initialization flow process.Otherwise the expression system is in continuous running status, then enters fast initialization.Its steps in sequence is: CPU control makes CTL_RXCS and CTL_TXCS for high; CPU control makes draws high ADSL nest plate RESET signal; The universal test of cpu reset SAR module and operating physical interface and other device; Reset finish after, CPU drags down CTL_RXCS and CTL_TXCS; CPU discharges the RESET control of ADSL nest plate.Thereby finish fast initialization.

After having passed through such processing, the time of fast initialization only needs about 1ms, and in short time so, the communication of ADSL local side and user side is not connected and can be damaged, and does not therefore need to reconnect, thereby has guaranteed that user's access does not go offline.

Claims

1, a kind of method of ADSL (Asymmetric Digital Subscriber Line) local side apparatus fast initialization may further comprise the steps:

The first step is with the transmission chip selection signal TXCS and the reception chip selection signal RXCS process resistance serial connection back output respectively of universal test and operating physical interface in each ADSL nest plate;

In second step,, and add control signal CTL_RXCS at corresponding input with the RXCS signal of each output and an output of line attachment driver together; Equally, with the TXCS signal of each output and together, and control the TXCS signal of described output with the CTL_TXCS signal;

In the 3rd step, when needs initialization adsl circuit, system judges at first whether adsl circuit is in continuous running status, if then enter the fast initialization flow process of next step, otherwise enter common initialization flow process;

The 4th step entered the fast initialization flow process, and CPU sends CTL_RXCS and CTL_TXCS high level signal, made to be in to be in from the data transmit-receive sheet choosing of the universal test of the ADSL nest plate of pattern and operating physical interface to forbid attitude;

The 6th step, the universal test that is in holotype of cpu reset SAR module and operating physical interface;

The 7th step, reset finish after, CPU drags down CTL_RXCS and CTL_TXCS, CPU discharges the RESET control of ADSL nest plate.

2, the method for fast initialization as claimed in claim 1, it is characterized in that: the determining step whether described adsl circuit is in continuous running status is: prepare or linking status when CPU can read from the ADSL nest plate, then show to be in continuous running status, otherwise be discontinuous running status.

3, the method for fast initialization as claimed in claim 1, it is characterized in that: when the SAR module initialization, by CPU control the RXCS of all ADSL nest plates and TXCS signal are drawn high, after the universal test of SAR module and operating physical interface initialization finish, again they are dragged down to restore to the original state.

4, as the method for claim 1 or 3 described fast initializations, it is characterized in that:, then make universal test and operating physical interface IP address bus during initialization, be in high-impedance state and realize by hardware logic for the ADSL nest plate that does not define these two signals of RXCS and TXCS.