CN102510355B

CN102510355B - Method for realizing flexible expenditure data increase and decrease in PTN system

Info

Publication number: CN102510355B
Application number: CN201110354473.8A
Authority: CN
Inventors: 陈涛; 江榕; 陈飞月
Original assignee: Fiberhome Telecommunication Technologies Co Ltd
Current assignee: Fiberhome Telecommunication Technologies Co Ltd
Priority date: 2011-11-10
Filing date: 2011-11-10
Publication date: 2014-12-24
Anticipated expiration: 2031-11-10
Also published as: CN102510355A

Abstract

The invention discloses a method for realizing flexible expenditure data increase and decrease in a PTN (Packet Transport Network) system. The method is characterized in that expenditure data of each slot position is equally divided into a plurality of single frames corresponding to the slot position respectively, the plurality of single frames corresponding to each slot position are respectively compounded into a multi-frame corresponding to the slot position, updating is carried out through the expenditure data carried by each multi-frame according to a system clock and an expenditure clock, each single frame comprises X expenditure clock periods, and the X is equal to the system clock period divided by the expenditure clock period. In the invention, a multi-frame structure is adopted, that is, a plurality of single frames are used to complete expenditure delivery at one time, and the frame head of each single frame comprises corresponding slot position marks and expenditure types, so that the quantity of the single frames in the multi-frames is adjusted to flexibly realize the delivery of a great amount of expenditure data.

Description

The method that overhead data increases and decreases flexibly is realized in PTN system

Technical field

The present invention relates to PTN network, be specifically related to realize in PTN system the method that overhead data increases and decreases flexibly.

Background technology

In optical-fiber network, the expense transmission between various equipment is indispensable.SDH (Synchronous Digital Hierarchy in the past, SDH (Synchronous Digital Hierarchy)) the expense transmission of equipment, (speed is 8000HZ to the 8K clock signal of system SFP of general employing and SDH frame synchronization, duty ratio is 4/125) position, overhead clock speed is 1M(HZ), both are upper along alignment, and often kind of expense takies a hard wires, different slots takies different time-gap, as shown in Figure 1.The benefit done like this is that speed is low, and transmission is accurate, but every transferable overhead data of frame is limited.

More existing PTN system are also continue to use this pattern, just clock rate are brought up to 25M(HZ), as shown in Figure 2, this pattern cannot meet user's needs and roll up the demand that expense transmits entry.Existing pattern, at a system clock cycle (125us, speed is 8000HZ) in complete expense and upgrade, each system clock cycle can pass 3125bit, but, because PTN system generally all comprises multiple circuit dish, different circuit dish takies different time-gap, and the spread pin strip order being assigned to each single-deck is like this considerably less.In addition, some users require that every block circuit dish entry number can reach at most 2K i.e. 2 × 1024 entries, each entry 3bit, complete the expense transmission of so most amount, usually have two kinds of methods, and one is increase hard wires, and two is improve clock rate.But these two kinds of methods are all right obstructed, increasing hard wires will the correcting of single-deck hardware, and will increase the line of a lot of root and backboard terminal; And improve clock rate, then to bring up to 350MHZ just passable, the too high reliability being unfavorable for transfer of data of speed.

Summary of the invention

Technical problem to be solved by this invention solves in PTN system the problem that cannot meet large quantity overhead data and transmit.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is to provide in a kind of PTN system the method realizing overhead data and increase and decrease flexibly, the overhead data of each slot is divided into the multiple single frames corresponding with this slot respectively, and the described multiple single frames corresponding with each slot is complex as a multi-frame corresponding with this slot respectively, the overhead data carried by each described multi-frame upgrades according to system clock and overhead clock, each described single frames comprises X overhead clock cycle, and X equals system clock cycle week divided by the overhead clock cycle.

In the above-mentioned methods, each described single frames is made up of frame head and payload two parts, and described frame head comprises the slot mark and overhead type that each single frames transmits, and described overhead type refers to the corresponding numbering of multiple single frames, and described payload is corresponding overhead data.

In the above-mentioned methods, described frame head is made up of 4 bit, and front 2 bit represent the slot mark that this single frames transmits, and rear 2 bit represent the overhead type that this single frames transmits.

In the above-mentioned methods, in a system clock cycle, to whole corresponding multi-frame corresponding to all slots simultaneously with 1K byte for long measure sequence delivery.

The present invention, adopts multi-frame structure, has namely carried out an expense transmission by multiple single frames, and each single frames frame head comprises corresponding slot mark and overhead type, so just can realize the transmission of a large amount of overhead data neatly by the quantity of single frames in adjustment multi-frame.

Accompanying drawing explanation

Fig. 1 SDH (Synchronous Digital Hierarchy, SDH (Synchronous Digital Hierarchy)) device bus sequential chart;

Fig. 2 existing PTN(Packet Transport Network, Packet Transport Network) the bus timing figure of system;

PTN(Packet Transport Network in Fig. 3 the present invention, Packet Transport Network) the bus timing figure of system.

Embodiment

Below in conjunction with accompanying drawing, the present invention is described in detail.

As shown in Figure 3, provided by the inventionly realize the method that overhead data increases and decreases flexibly and realize in the following way.

According to the multi-frame structure principle in SDH, the overhead data of each slot is divided into the multiple single frames corresponding with this slot respectively, and the described multiple single frames corresponding with each slot is complex as a multi-frame corresponding with this slot respectively, the overhead data carried by each described multi-frame upgrades according to system clock and overhead clock.

Such as, PTN device is provided with M slot (M >=1), by each slot Mi(i=1,2 ..., M) overhead data be decomposed into N number of single frames (N >=2, and can increase and decrease according to actual conditions) respectively.

Each single frames comprises X overhead clock cycle, and X equals system clock cycle divided by the overhead clock cycle.Each overhead clock cycle can transmit the overhead data of a bit, and like this, the quantity X in the overhead clock cycle comprised in each single frames determines the bit quantity that a single frames can transmit.Such as, system-clock rate is the 8000HZ(clock cycle is 125us), overhead clock speed is the 25MHZ(clock cycle is 40us), then X=125us/40ns=3125.

Each single frames is made up of frame head and payload two parts, wherein frame head is used for distinguishing the information that each single frames transmits, comprise slot mark and overhead type that each single frames transmits, because overhead data cannot not transmit completely in a single frames, therefore divide into N number of part, each single frames transmits a part, and overhead type refers to the numbering (i.e. the corresponding numbering of single frames) of each Section Overhead data.In the present embodiment, frame head is made up of 4 bit, and front 2 bit represent slot mark, and rear 2 bit represent overhead type.Be payload after frame head, i.e. corresponding overhead data.

Because a system clock cycle can transmit a bit of the corresponding multi-frame in all slots, and each multi-frame is made up of N number of single frames, therefore, the present invention can transmit Nbit in a system clock cycle, the transmission capacity of overhead data increases N doubly, by the setting to single frames quantity N, the increase and decrease of overhead data can be realized neatly.

Increase overhead data amount at any time conveniently, whole corresponding multi-frame corresponding to all slots can adopt interleaving mode transmission, namely in a system clock cycle, the whole multi-frames corresponding with corresponding slot simultaneously with 1K byte for long measure sequence delivery.Specifically, if each slot needs N number of single frames can pass its expense, after having passed the 1K byte (comprising 1024 expense entries) of the corresponding multi-frame in all slots so successively, transmit 2K byte again, until passed NK byte, such benefit has been, if dilatation later also needs to increase overhead data amount, directly increase (N+1) K below, (N+2) K ..., and without the need to changing hardware.At receiving terminal, the concrete numbering of N number of single frames that a multi-frame comprises can be judged by the information of the frame head of multiple single frames (overhead type), thus carry out in order combining to form complete overhead data.

The present invention is not limited to above-mentioned preferred forms, and anyone should learn the structural change made under enlightenment of the present invention, and every have identical or close technical scheme with the present invention, all falls within protection scope of the present invention.

Claims

The method that overhead data increases and decreases flexibly is realized in 1.PTN system, it is characterized in that, the overhead data of each slot is divided into the multiple single frames corresponding with this slot respectively, and the described multiple single frames corresponding with each slot is complex as a multi-frame corresponding with this slot respectively, the overhead data carried by each described multi-frame upgrades according to system clock and overhead clock, each described single frames comprises X overhead clock cycle, and X equals system clock cycle divided by the overhead clock cycle; Each described single frames is made up of frame head and payload two parts, and described frame head comprises the slot mark and overhead type that each single frames transmits, and described overhead type refers to the corresponding numbering of multiple single frames, and described payload is corresponding overhead data; In a system clock cycle, to whole corresponding multi-frame corresponding to all slots simultaneously with 1K byte for long measure sequence delivery, specifically, if each slot needs N number of single frames can pass its expense, after having passed the 1K byte of the corresponding multi-frame in all slots so successively, transmit 2K byte again, until passed NK byte, wherein 1K byte packet is containing 1024 expense entries.
2. realize the method that overhead data increases and decreases flexibly in PTN system as claimed in claim 1, it is characterized in that, described frame head is made up of 4 bit, and front 2 bit represent the slot mark that this single frames transmits, and rear 2 bit represent the overhead type that this single frames transmits.