CN1275415C

CN1275415C - Device for automatic protective switching optical interface

Info

Publication number: CN1275415C
Application number: CNB2003101032251A
Authority: CN
Inventors: 袁树风; 王柯; 胡遇杰
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2003-11-03
Filing date: 2003-11-03
Publication date: 2006-09-13
Anticipated expiration: 2023-11-03
Also published as: CN1540905A

Abstract

The present invention discloses a device for automatically protecting and switching an optical interface in the field of optical transmission communication, which comprises a first optical module, a second optical module, an electrical level multi-channel selecting chip, an electrical level dispensing chip, a physical layer chip and a logic control chip. An exterior primary use single board and a spare single board send data to the two optical modules in the receiving direction, and the output ends of the two optical modules are connected with the electrical level multi-channel selecting chip which selects one of the two optical modules to send to the physical layer chip. After processed and converted by the physical layer chip, the optical module is sent to the logic control chip. The signals sent by the physical layer chip are simultaneously sent to the two optical modules by the electrical level dispensing chip in the sending direction and are respectively connected with the exterior primary use single board and the spare single board, and the two paths of signals are constantly, simultaneously and effectively output. The device of the present invention realizes the primary and spare switching as well as reduces the cost of the single boards and increase robustness of a system.

Description

The optical interface automatic protection switching arrangement

Technical field

The present invention relates to the optical transmission communication field, relate in particular to a kind of optical interface and protect back-up device automatically.

Background technology

At present; SDH (Synchronous Digital Hierarchy; synchronous digital hierarchy) optical transport network obtains increasingly extensive application at communication field; continuous growth along with social demand; the technical merit of SDH optical transport network is also in quick progress; the formulation of relevant criterion is also being brought in constant renewal in; wherein about optical interface APS function; in the G.841 number suggestion " type and the characteristic of SDH network protection architecture " of the ITU-T of International Telecommunication Association (InternationalTelecommunication Union Telecommunication Standardization Secto, the branch of the relevant telecommunication standard of International Telecommunications Union), made specific description.G.841 mainly provide SDH network protection architecture based on the different implementation methods on the mechanical floor, the protection that protection entity scope can be from single SDH multiplexing node to the end-to-end and whole SDH end-to-end path of part SDH.Implementation method physically can comprise node cycle or node line chain, has pointed out the guideline of network object, framework, application function, switching criterion, agreement and algorithm in the protection classification.Some relevant patent and patent applications have also appearred; wherein, (application number: 96195023.4) " self-healing network " proposes an outstanding relatively solution to the APS function of SDH optical transport network to the patent application submitted to Patent Office of the People's Republic of China on June 18th, 1996 of Sweden Ellison Telephone Co., Ltd.The measuring ability of this patent utilization network node, detect failure condition (as the fiber cut between two nodes) with this section spot correlation, when breaking down situation, need not network management and can reselect route transmission business, and when fault restoration, can come on original route sending business recovery automatically, thereby realize self-healing function.But it is this based on APS (Automatic protection switching, automatic protection switching: APS controller and webmaster are provided in the network, be responsible for monitoring and managing the state of all nodes, when finding node failure to occur, automatically finish various route protections, route is heavily distributed, Node Protection, the switching strategy of the function of reset after the discarded and fault recovery of node) is a self-healing solution that is applied to whole network, for the switch instances that is applied to a concrete node device inside, then realize: discarded this node in certain hour by following method, the network route is redefined under the management of APS webmaster module, thereby walk around this node; By the time after this node is connected normally with network, carried out the recovery of network route again by the APS administration module, therefore realize that cost is higher, technology is complicated.In addition, when the alarm triggered defencive function occurring, also need to protect redistributing of channel; so, aspect the realization of single-plate grade, because device interior does not possess loop net networking condition; need to adopt at least 2 physical layer equipments to finish switching, cost is higher, and economy is relatively poor.

Summary of the invention

The objective of the invention is to overcome cost height in inner switching of the concrete node device of processing that prior art exists, realize complicated, less economical shortcoming, in the hope of proposing a kind of can use at device interior, not use complicated algorithm, optical interface auto switching protective device and method cheaply.

For achieving the above object, the present invention has constructed a kind of optical interface automatic protection switching arrangement, comprises first optical module, physical chip and logic control chip, it is characterized in that, also comprises second optical module, level multichannel selection chip and level distribution chip;

At receive direction, outside master sends data to described first optical module and second optical module by optical fiber 1 and optical fiber 2 respectively with veneer and standby board, the output of described first optical module and second optical module all is connected to described level multichannel and selects chip, described level multichannel selects chip to select one to deliver to described physical chip from described first optical module and second optical module, described logic control chip is delivered in processing and conversion through described physical chip afterwards, the alarm signal of described physical chip is also delivered to described logic control chip simultaneously, by described logic control chips incorporate number control signal, output a control signal to described level multichannel and select chip, which road optical fiber decision selects on receive direction;

On sending direction, the signal of being sent by described physical chip is sent to described first optical module and second optical module simultaneously through described level distribution chip, be connected to outside main veneer and the standby board used again respectively, this two paths of signals is output effectively simultaneously all the time.

Device of the present invention is by adopting fairly simple node self-healing method, in the input of the physical chip of optical interface, output, directly insert level switch, when receiving high severity alarm, physical chip carries out the switching of level switch, reach and change physical chip and optical module purpose of connecting, thereby the switches light interface guarantees the normal of data path to the backup optical interface.Because the optical interface business of this device interior node when working channel sends, also sends on the protection channel, when handover operation takes place, just will receive professional forwarding to from the protection channel and receive from the working channel reception.Compared with prior art, reduced the cost of veneer, also reached the effect of active and standby switching simultaneously, and also can participate in intervening without software, save development cost, improved system robustness (what is ability to work and the adaptive capacity that the system robustness system robustness promptly refers to system to ask brief description).

Description of drawings

Fig. 1 is an optical interface automatic protection switching arrangement structure chart of the present invention.

Fig. 2 be as embodiment based on ATM optical interface automatic protection switching arrangement structure chart.

Embodiment

Be described in further detail below in conjunction with the enforcement of accompanying drawing technical scheme:

In optical interface automatic protection switching arrangement structure chart shown in Figure 1, comprise first optical module, second optical module, level multichannel selection chip, level distribution chip, physical chip and logic control chip, the annexation of various piece is described below:

At receive direction (for this interface single plate, the definition of following direction is in like manner): outside main send data to first optical module 11 and second optical module 12 on this interface single plate by optical fiber 1 and optical fiber 2 respectively with veneer and standby board, the output of first optical module 11 and second optical module 12 all is connected to the level multichannel and selects chip 13, this chip selects one the road to deliver to physical chip 15 from this two-way, handle through the logic control chip 16 that the processing and the conversion of physical chip 15 are delivered in the plate afterwards, the alarm signal of physical chip 15 is delivered to logic control chip 16 simultaneously, by the control signal of logic control chip 16 in conjunction with output level multichannel selection chip 13 after the number control signal, which road optical fiber decision selects on receive direction.On sending direction, the signal of being sent by physical chip 15 is sent to first optical module 11 and second optical module 12 simultaneously through over level distribution chip 14, is connected to outside primary and backup veneer more respectively, and this two paths of signals is output effectively simultaneously all the time.

The course of work of above-mentioned optical interface automatic protection switching arrangement is as follows:

The first step connects.

This step can comprise the following steps: again

1 optical fiber 1 connects the main veneer of using

2 optical fiber 2 connect standby board

Second step started.

Enable logic control chip 16 and main control part, initialization physical chip 15, transmitting business signal carries out communication via main with veneer.

The 3rd step switched.

Link appears when unusual when main with veneer, can detect at physical chip 15 and to obtain link exception information, this physical chip 15 can provide corresponding output at the various alarm signals of the framing of data link layer, the signal that physical chip 15 is exported to logic is used for the input of logic control chip 16, through logic (perhaps comprehensive restriction) judgement output from main control part, change the level multichannel and select the selection of chip 13 to enable, the importation of transmitting business signal is imported via standby board.Can safeguard with veneer and intervene former master this moment.

The 4th step recovered.

Main recover with veneer after since main with veneer also can receive the information that physical chip 15 sends over thereby can keep with standby board synchronously; Can master control pro-active intervention physical chip 15 switch to this moment and mainly use veneer, also can directly use former main with veneer as standby, wait switches next time.

Be example with the active and standby automatic protection switching of ATM transmission optical interface more below, the invention will be further described.In ATM was transmitted in main preparation system between interface board and the switching card, hardware components was made up of the two large divisions: switching board (comprising primary, spare) and interface single plate.Wherein the interface single plate part is by forming with the lower part: (1) physical layer equipment (being ATM phy layer chip 25 in this example), can carry out initialization by the CPU27 on the veneer, and be responsible for collecting optical interface state, outputting alarm signal.(2) optical module, optical module receives optical fiber and passes the information of coming, and carries out the mutual conversion of photosignal.And the signal that receives the output of pecl chip for driving is converted into light signal.Comprise two

optical modules

21,22, be connected to primary and backup switching board by optical fiber respectively.(3) pecl circuit part comprises that pecl 2 selects 1 minute 2 differential driving chip 24 of 1 differential driving chip 23 and pecl and each termination circuit.Be used to carry out the selection and the distribution of pecl level, the actual selection that realizes switching.The selection of collective's circuit enables by the signal controlling from programming device.(4) programmable logic device Epld, 26, Epld finishes the unusual output signal of link of ATM phy layer and some necessary control signals is carried out integrated treatment, and the result outputs to pecl 2 and selects 1 differential driving chip 23 to remove to enable effectively to import the pecl signal.Software section belongs to selectable items, is operated on the cpu27 of interface single plate, mainly be responsible for receiving the optical interface switching signal that logic provides after, report to the backstage network management system.

The present invention is suitable between single network equipment node inside, the machine frame and the active and standby system that uses on interconnected between the frame.Cancel numerous and diverse detection and management, reduced system cost effectively, but do not reduced the active and standby validity of system.Can provide simultaneously automatically and intervene, also provide enough interfaces and be used for necessary software extensions, exploitation value is preferably arranged with forcing.

Claims

1, a kind of optical interface automatic protection switching arrangement, comprise first optical module (11), physical chip (15) and logic control chip (16), it is characterized in that, also comprise second optical module (12), level multichannel selection chip (13) and level distribution chip (14), described first optical module and second optical module are finished the mutual conversion of photosignal, described physical chip is responsible for collecting the optical interface state, the outputting alarm signal;

At receive direction, outside master sends data to described first optical module (11) and second optical module (12) respectively with veneer and standby board, the output of described first optical module (11) and second optical module (12) all is connected to described level multichannel and selects chip (13), described level multichannel selects chip (13) to select one to deliver to described physical chip (15) from described first optical module (11) and second optical module (12), described logic control chip (16) is delivered in processing and conversion through described physical chip (15) afterwards, the alarm signal of described physical chip (15) is also delivered to described logic control chip (16) simultaneously, by described logic control chip (16) in conjunction with number control signal, output a control signal to described level multichannel and select chip (13), which road optical fiber decision selects on receive direction;

On sending direction, the signal of being sent by described physical chip (15) is sent to described first optical module (11) and second optical module (12) simultaneously through described level distribution chip (14), be connected to outside main veneer and the standby board used again respectively, this two paths of signals is output effectively simultaneously all the time.

2, optical interface automatic protection switching arrangement according to claim 1 is characterized in that, described outside master is to pass through fibre circuit with the mode that veneer and standby board send data to described first optical module (11) and second optical module (12) respectively.

3, optical interface automatic protection switching arrangement according to claim 1 is characterized in that, it is 2 to select 1 differential driving chip that described level multichannel is selected chip (13).

4, optical interface automatic protection switching arrangement according to claim 1 is characterized in that, described level distribution chip (14) is 1 minute 2 differential driving chip.

5, optical interface automatic protection switching arrangement according to claim 1 is characterized in that, described physical chip (15) is an ATM phy layer chip (25).