CN100518022C

CN100518022C - Realization of automatic light shut off function for light transmitting network in synchronous digital system

Info

Publication number: CN100518022C
Application number: CNB2004100092391A
Authority: CN
Inventors: 谢云鹏; 王康; 张佩华
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2004-06-22
Filing date: 2004-06-22
Publication date: 2009-07-22
Anticipated expiration: 2024-06-22
Also published as: CN1713547A

Abstract

The method includes following steps: in software system of net element in optical transportation network, the high quadbit in S1 byte is used to automatically cut off instruction; checks the alarm information in optical interface of net element; the optical interface sends the cut off instruction to relevant optical interface of connected net element according to the alarm message; the relevant optical interface of net element checks the received cut off instruction, and makes relevant operation for the optical interface.

Description

The light of SDH (Synchronous Digital Hierarchy) optical transfer network automatically shuts down the implementation method of function

Technical field

The present invention relates to the SDH (Synchronous Digital Hierarchy) optical transport network, particularly relate to and a kind ofly carry out the method that light automatically shuts down at the SDH (Synchronous Digital Hierarchy) optical transport network.

Background technology

Because laser has harm to human eye; therefore in the transmission network technology that with optical fiber is passage, require in transmitting net, to have the light safe functioning, promptly occurring that optical fiber damages or cut the time; need in time close the transmission of laser, be without prejudice with the protection human eye.

ITU-T G.664 (new criteria of the relevant optical communication system safety of international telecommunication standard Advisory Board-" security procedure of light conveying system and requirement ") defined measure and the requirement that light safety realizes in the optical transfer network, at present general implementation method as shown in Figure 1, detect at the receiving terminal 121 of network element 120 that (process a) after LOS (dropout) alarm surpassed 500ms, can notify this network element transmitting terminal 122 (process b), cause the transmission laser to close (process c), the receiving terminal 111 of network element 110 can detect LOS alarm (process d) afterwards, after the LOS alarm continues 500ms, can cause the transmission laser of the transmitting terminal 112 of network element 110 to close (process e).Process is shown in a～e among the figure.

But implementation method G.664 mainly is to be used for point-to-point ALS (Automatic LaserShutdown light automatically shuts down) function to realize; different protected modes when not considering SDH (Synchronous DigitalHierarchy SDH (Synchronous Digital Hierarchy)) equipment annular networking; and for the networking mode of annular; all adopt implementation method with a kind of ALS function; the problem that can cause SDH ring protection disabler; for example in the transfer system of SDH; system property is under the situation of two fine unidirectional path protection rings; if the optical fiber of some directions breaks down; the business reception of network element can switch on the standby optical fiber of another direction; as Fig. 2 A; shown in the 2B, be the switching of two fine channel protection rings before; after schematic diagram.

If SDH ring protection type is two fine path protections; under normal circumstances; suppose that business configuration as shown in Figure 3A; then when fault shown in Fig. 3 B occurring; according to the SDH protection philosophy; business is with unaffected; if but adopt point-to-point ALS function implementation method shown in Figure 1; under the failure condition shown in Fig. 3 B; can make the transmission of light mouth 331 of the light mouth 312 of network element 310 and network element 330 all close; cause the whole service ring to disconnect, cause professional the appearance to be interrupted, and make system lose the path protection ability.

In addition, method has G.664 also been closed normal fiber-optic signal in closing fault optical fiber, is unfavorable for unidirectional service delivery like this.

By top analysis as seen, the method G.664 of current usefulness has two defectives:

1) in the closing fault fiber-optic signal, can close the signal of normal optical fiber;

2) be unfavorable for the protection of looped network business, can causing the professional unnecessary interruption of looped network in some cases.

Summary of the invention

The light that technical problem to be solved by this invention provides a kind of SDH (Synchronous Digital Hierarchy) optical transfer network automatically shuts down the implementation method of function; when solving prior art closing fault fiber-optic signal; can close the signal of normal optical fiber, and be unfavorable for the technical problem of looped network service protection.

For achieving the above object, the light that the invention provides a kind of SDH (Synchronous Digital Hierarchy) optical transfer network automatically shuts down the implementation method of function, and its characteristics are, comprise the steps:

Step 1 in SDH optical transport network system, utilizes high four the definition light of Synchronization Status Message S1 byte to automatically shut down instruction;

Step 2, the warning information of detection network element light mouth;

Step 3, network element light mouth send described light to the corresponding network element light mouth that is connected and automatically shut down instruction according to described warning information;

Step 4, the described light that the inspection of described corresponding network element light mouth receives automatically shuts down instruction;

Step 5, described corresponding network element light mouth automatically shut down instruction according to described light and carry out the operation of corresponding light mouth.

Above-mentioned method, its characteristics are that in the described step 1, it is to send instruction by setting the high four of Synchronization Status Message S1 byte, define to open light transmission instruction and close black out that described definition light automatically shuts down instruction.

Above-mentioned method, its characteristics are that described step 3 further comprises: when described warning information does not comprise loss of signal alarm, send the described light of opening and send instruction.

Above-mentioned method, its characteristics are that described step 5 further comprises: judge that described light automatically shuts down instruction and opens light transmission instruction or pass black out transmission instruction, if open the light transmission that described corresponding network element light mouth is then opened in light transmission instruction; Send the light transmission that described corresponding network element light mouth is then closed in instruction if close black out.

Above-mentioned method, its characteristics are, in the described step 5, automatically shut down the instruction duration above after the 500ms at described light, and described corresponding network element light mouth carries out the operation of corresponding light mouth.

Above-mentioned method, its characteristics be, sets high four of described S1 byte and be encoded to 0x3 and represent to close black out and send instruction, and Gao Siwei is encoded to 0xA and represents to open light and send instruction.

Above-mentioned method, its characteristics are, realize opening or closing light by the laser that opens or closes described corresponding network element light mouth and send.

Technique effect of the present invention is:

Adopt the method for the invention; compared with prior art; notify the fault network element owing to adopt S1 byte; the directly measure that fault light mouth is closed; make under the situation of SDH annular networking, when realizing the light safety function, can not have influence on the service protection function of system and network element; simultaneously can not have influence on normal optical fiber yet, remedy the defective of original realization technology.

Further describe specific embodiments of the invention below in conjunction with accompanying drawing.

Description of drawings

Fig. 1 is the realization schematic diagram of existing smooth safety function;

Fig. 2 A, 2B are the protection schematic diagrames that SDH transmits net system two fine channel protection rings;

Fig. 3 A, 3B are the professional schematic diagrames that SDH transmits net system two fine channel protection rings;

Fig. 4 is the realization schematic diagram of the inventive method;

Fig. 5 is a flow chart of realizing the inventive method.

Embodiment

Below in conjunction with accompanying drawing, substantially be described in further detail according to the enforcement of the order of accompanying drawing to technical scheme:

Fig. 1 has introduced the implementation method of ITU-T ALS function G.664.

Fig. 2 A, 2B have described the realization principle of SDH channel protection ring; wherein Fig. 2 A is business configuration figure under the normal condition; when Fig. 2 B 220-＞230 direction faults occurred for optical fiber between network element 220 network elements 230,230 professional AC can switch to light mouth 231 directions from light mouth 232 directions at the acceptance point of network element 230 from network element 210 to network element.

Fig. 3 has described another kind of fiber failure situation in the channel protection ring, and regular traffic disposes shown in Fig. 3 A, and when this moment occurring the fiber failure shown in Fig. 3 B, according to the SDH protection philosophy,

network element

310 and 330 professional receive direction can not switched.If according to ITU-T implementation method (Fig. 1) G.664, then the result can be that the light mouth 312 of network element 310, the light mouth 341 of network element 340, the light mouth 332 of network element 330 and the light mouth 321 of network element 320 all can be closed the transmission laser, causes service disconnection on the whole ring.

Fig. 4 has introduced realization principle of the present invention, promptly adopts the S1 byte Notification Method, only notifies the fault network element to close out of order light mouth and sends laser.In Fig. 4, after the receiving terminal 421 of network element 420 detects the LOS alarm, can notify transmitting terminal 422 to send specific S1 byte to network element 410, after the receiving terminal 411 of network element 410 receives specific S1 byte, can close laser transmitting set 412, implementation procedure is shown in a～d among the figure.According to implementation method so, when fiber failure shown in Fig. 3 B occurring, have only the transmission laser of the light mouth 341 of the light mouth 321 of network element 320 and network element 340 to close, and can not have influence on original business.

G.707, ITU-T does not define the Gao Siwei of S1 byte in the SDH (Synchronous Digital Hierarchy).

The present invention just is being to use undefined high four to realize the ALS function.

Fig. 5 has introduced realization flow figure of the present invention, comprising:

Step 510 is utilized high four the definition ALS of S1 byte instruction;

Step 520 detects light mouth signal warning information;

Step 530 according to light mouth warning information, sends the S1 byte instruction;

Step 540 is checked the S1 byte that receives;

Step 550 is according to S1 byte instruction the carrying out corresponding light mouth operation that receives.

Concrete realization is, utilizes S1 byte undefined high four in G.707 at ITU-T, carries out the ALS command coding, only need two prescribed codings of definition, an expression is closed laser and is sent, and an expression is opened laser and sent, and utilizes the instruction of these two definition to finish the ALS function.Transmit in the network at SDH, detect certain light mouth receive direction at network element and dropout (LOS) when alarm occur,, will close laser instructions and be sent to the fault network element by sending direction by the S1 byte signaling, make the fault network element only close to break down the laser transmitting set of light mouth, as accompanying drawing 4.Rather than the method for this network element laser transmitting set is directly closed in employing.Detect the S1 byte that receives simultaneously,, open and close the operation of laser accordingly by analyzing high 4 codings of S1 byte.

Fault with Fig. 3 B is an example, and the concrete implementation procedure of network element 320 and network element 330 is as follows:

Network element 330:

1) Gao Siwei to S1 byte encodes in software systems, defines the instruction of expression ALS function, sets high four and is encoded to 0x3 and represents to close black out and send, and sends for 0xA represents to open light;

2) detect network element light mouth warning information, find that light mouth 331 receiving terminals do not have the LOS alarm, light mouth 332 receiving terminal directions have the LOS alarm;

3) because light mouth 331 receives no LOS alarm, high four are encoded to 0xA in the S1 byte that the transmitting terminal of light mouth 331 sends, and promptly allow the opposite end open the light mouth and send; Because light mouth 332 receiving terminals have the LOS alarm, high four are encoded to 0x3 in the S1 byte that the transmitting terminal of light mouth 332 sends, and promptly allow the opposite end close the black out mouth and send;

4) detect the S1 byte of receiving, normal because this network element sends optical fiber, high four codings of receiving from light mouth 331 of S1 byte will be 0xA, because LOS appears in light mouth 332, be invalid value from light mouth 332 detected S1 byte, will not judge;

5) according to high four coded commands of S1 byte, network element is opened light mouth 331, the transmission of initiatively opening light mouth 332 simultaneously.

Network element 320:

2) detect network element light mouth warning information, find that light mouth 321 receiving terminals do not have the LOS alarm, light mouth 322 receiving terminal directions do not have the LOS alarm;

3) because light mouth 321 receives no LOS alarm, high four are encoded to 0xA in the S1 byte that the transmitting terminal of light mouth 321 sends, and promptly allow the opposite end open the light mouth and send; Because light mouth 322 receiving terminals do not have the LOS alarm, high four are encoded to 0xA in the S1 byte that the transmitting terminal of light mouth 322 sends, and promptly allow the opposite end open the light mouth and send;

4) detect the S1 byte of receiving, high four codings of receiving from light mouth 321 of S1 byte will be 0x3, and high four codings of receiving from light mouth 322 of S1 byte will be 0xA;

5) because high four codings of S1 that light mouth 321 is received are 0x3, after the duration surpassed 500ms, network element closed black out mouth 321 and sends; Because high four codings of S1 byte that light mouth 322 is received are 0xA, network element is opened the transmission of light mouth 322.

By above process, the light that network element 320 has been closed on the optical fiber that breaks down sends, and has so just realized the ALS function in the fault optical fiber.

In sum, the present invention utilizes in the SDH system being not defined as of overhead byte S1 to encode, and realizes the function of SDH device A LS, is that a kind of realization is simple, can adapt to the ALS function implementation method of many kinds of networkings of SDH.

The above is preferred embodiment of the present invention only, is not to be used for limiting practical range of the present invention; Every according to equivalence variation and modification that the present invention did, all contained by claim of the present invention.

Claims

1, a kind of light of SDH (Synchronous Digital Hierarchy) optical transfer network automatically shuts down the implementation method of function, it is characterized in that, comprises the steps:

Step 1 in SDH optical transport network system, is utilized high four definition of Synchronization Status Message S1 byte to open light and is sent instruction and close black out transmission instruction;

Step 2, the warning information of detection network element light mouth;

Step 3, if described warning information comprises loss of signal alarm, then network element light mouth sends described pass black out to the corresponding network element light mouth that is connected and sends instruction according to described warning information;

Step 4, the described pass black out that the inspection of described corresponding network element light mouth receives sends instruction;

Step 5, described corresponding network element light mouth sends the light transmission that described corresponding network element light mouth is closed in instruction according to described pass black out.

2, method according to claim 1 is characterized in that, described step 3 further comprises: if described warning information does not comprise loss of signal alarm, then described network element light mouth sends the described light of opening to the corresponding network element light mouth that is connected and sends instruction; Described step 4 further comprises: the described light of opening that the inspection of described corresponding network element light mouth receives sends the instruction mouth; Described step 5 further comprises: described corresponding network element light mouth sends according to the described light of opening the described corresponding network element light mouth of light transmission instruction unpack.

3, method according to claim 2, it is characterized in that, in the described step 5, send instruction and close black out and send after the instruction duration surpasses 500ms at the described light of opening, the light that the light that described corresponding network element light mouth is closed described corresponding network element light mouth sent or opened described corresponding network element light mouth sends.

4, method according to claim 1 is characterized in that, sets high four of described S1 byte and is encoded to 0x3 and represents to close black out and send instruction, and Gao Siwei is encoded to 0xA and represents to open light and send instruction.

5, method according to claim 4 is characterized in that, realizes opening or closing light by the laser that opens or closes described corresponding network element light mouth and sends.