CN1142640C - Communication link protection method for chain-type optical fibre network - Google Patents
Communication link protection method for chain-type optical fibre network Download PDFInfo
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- CN1142640C CN1142640C CNB991073398A CN99107339A CN1142640C CN 1142640 C CN1142640 C CN 1142640C CN B991073398 A CNB991073398 A CN B991073398A CN 99107339 A CN99107339 A CN 99107339A CN 1142640 C CN1142640 C CN 1142640C
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Abstract
The present invention discloses a method for protecting the communication links of chain-type optical fiber networks. The method has the procedures that an input standby link of an optical fiber network unit (ONU) at the initial end and an output standby link of an ONU at the tail end are respectively led out and mutually connected by a telecommunication channel; the output standby link and the input standby link between the optical fiber network units are also mutually connected by transmission lines, the fixed connection between the input standby link and the output standby link is formed in the optical fiber network units, and a standby link loop is formed when the telecommunication channel is combined; the protection of any main link between the optical fiber network units is achieved by the standby link loop and the internal protective switching of the optical fiber network units.
Description
The present invention relates to a kind of guard method of network communication link, particularly relate to a kind of communication link protection method that adopts the optical transport network of communication link protection mode.
Along with the develop rapidly of modern digital communication and optical transport technology, obtaining more and more widely application based on the multi-service access node of Optical Fiber Transmission.Wherein, adopt the Optical Access Network of communication link protection mode because characteristics such as its cost and adaptation long-distance transmissions more obtain application more and more widely in such as many systems such as railways.In this communication network, generally adopt the method for main/slave link that important communication link is protected.Shown in Fig. 1 (a); in the system that adopts the main/slave link protection mechanism; generally kept one or more reserve link (among the figure shown in the dotted line) between two communication nodes that face mutually; when active link (among the figure shown in the solid line) interrupts; communication node is smoothly transferred to the business on the active link (shown in the double-head arrow straight line) on the reserve link automatically; shown in Fig. 1 (b), to guarantee the important communication reliability of link transmission.
Distance between, the node less when the communication node number more in short-term, above-mentioned active/standby mode can provide reliable and stable protection mechanism.The switch (LE) of International Telecommunication Union's regulation and the V5.2 interface between the Access Network (AN) to the protection of communication port, also mainly are to adopt active/standby mode.But more when the communication node number, when distance is long between the node, adopt active/standby mode that communication link is protected, but brought some insoluble problems.
With the railway private network is example, because its network configuration is more special, generally adopts communication link protection, it is more diffusing to distribute geographically between higher level's module and the subordinate's module, and the length of chain net can reach the hundreds of kilometer, and even thousands of kilometer, therefore, the general optical transmission system that adopts of transmission.The 2M E1 of each subordinate's module optical network unit (ONU) is unified from railway optical fiber transport channel of laying along the line, and the reason of interruption takes place E1, most possibly is optical transmission device fault or optical fiber physical damnification.Because the active and standby link of ONU is all on same optical fiber; so when active link (among the figure shown in the solid line) interrupts; reserve link (among the figure shown in the dotted line) also may interrupt together, thereby reserve link can not play a protective role, shown in Fig. 2 (a).By Fig. 2 (b) as can be seen; if the fiber break between ONU B and the ONU C; so not only cause all ONU after the recurrent network ONU B and the communication disruption between higher level's module optical line terminal (OLT); and the communication between ONU B and the ONU C is also interrupted simultaneously; in this case; standby E1 between ONU B and the ONU C also can't bring into play protective effect.
The problems referred to above are traced it to its cause and just are, in the railway private network of communication link protection, between the ONU by optical transmission system communication, active and standby E1 is on same optical fiber, therefore, the reliability step of standby E1 is identical with the main E1 that uses, and, when the master was interrupted with E1, standby E1 interrupted simultaneously.
Therefore; in the system that communication link is protected with active and standby working method; address the above problem; must improve the reliability of reserve link; such as: 1, be independent of existing optical transmission system; lay standby optical fiber in addition, reserve link avoids main/slave link in same optical fiber or same communication pipe by standby Optical Fiber Transmission.2, reserve link is by the higher transmission means of other reliability.But, above this dual mode, all can cause the cost of investment of network to increase greatly, actual application value is not high.
In view of this; purpose of the present invention just is to provide a kind of novel communication link protection method in the optical transport network of communication link protection mode; it can make full use of existing equipment, not increase cost of investment, solves simply, easily based on the contradiction between cost of investment and the system reliability in the multi-service access node of Optical Fiber Transmission.
The objective of the invention is to be achieved through the following technical solutions:
A kind of communication link protection method of chain-type optical fibre network is characterized in that the method includes the steps of:
Determine into to communication link with go out according to chain net east-west to communication link, the communication link of optical network unit (ONU) has at least becomes owner of with link, goes into reserve link and go out active link, go out four kinds of reserve links, wherein, the initiating terminal optical network unit does not have to become owner of uses link, and the distal optical fiber network element does not have the active link of going out;
The reserve link that goes out of going into reserve link and distal optical fiber network element of initiating terminal optical network unit is drawn respectively, and set up interconnection by a long haul communication passage;
Going out reserve link and going into reserve link between the optical network unit (ONU) is connected to each other by transmission line, go into reserve link and go out fixedlying connected of reserve link in the inner foundation of optical network unit (ONU), again in conjunction with the long haul communication passage between the reserve link of going out of going into reserve link and distal optical fiber network element of described initiating terminal optical network unit, thereby form the loop of a reserve link;
Switch and described reserve link loop by the protection that optical network unit (ONU) is inner, realize protection any active link between the optical network unit (ONU).
According to technique scheme, described optical network unit (ONU) is inner set up go into reserve link and go out the fixedlying connected on the net sheet of reserve link by semipermanent ways of connecting realization.
According to technique scheme, the inner protection switching of described optical network unit (ONU) comprises following steps:
When first optical network unit (ONU B) and second optical network unit (ONU C) generation interruption, first optical network unit (ONU B) go out the switching controls of active link by a protection switch unit, be connected internally to the reserve link that of this first optical network unit (ONU B); Becoming owner of with the switching controls of link by a protection switch unit of second optical network unit (ONU C) is connected internally to the reserve link of going into of this second optical network unit (ONU C).
Described protection switch unit can pass through field programmable gate array (FPGA) to be realized
According to technique scheme, described long haul communication passage communication link is via satellite realized, also can realize by modes such as optical transmission links.
Because above technical scheme, in the optical transmission system of communication link protection mode,, thereby formed the protection loop of a reserve link by a long haul communication passage, each optical network unit inside, outside connection of setting up.When any point in the transmission line takes place to interrupt; decide respectively with the protection switching of link by the optical network unit inside at interruptions two ends to reserve link; by the circuitous transmission of the protection loop of above-mentioned reserve link, realized protection to any active link in the chain net optical transmission system.
Adopt the inventive method; except initiating terminal ONU and terminal ONU respectively take the communication link of other transmission means; need not to add any equipment; also need not to bury underground standby optical fiber; directly utilize the existing optical transmission system of Access Network, just can form the reserve link guard ring, any two active links that face mutually between the ONU on the chain net are protected; can guarantee that the business between the ONU is not interrupted under the situation that optical fiber all interrupts.The communication link of described other transmission means for example, can be optical transmission link, satellite communication link etc., also is all existing transmission system, so the present invention is a kind of small investment really, realizes simple communication link protection method.
Below in conjunction with drawings and the specific embodiments the present invention is further described in detail again.
Fig. 1 is general communication link protection method.
Fig. 2 is the networking mode schematic diagram of railway private network.
Fig. 3 is the standby E1 guard ring schematic diagram in the embodiment of the invention railway private network.
Fig. 4 is in the embodiment of the invention railway private network, realizes main schematic diagram with the E1 protection between ONU by standby E1 guard ring.
Fig. 5 is the protection commutation circuit schematic diagram of embodiment of the invention protection switch unit (FPGA).
In a concrete application example railway private network, in order to guarantee the reliability of whole system,, generally all has satellite communication channel, to guarantee that under unexpected situation during as railway communication disruption along the line, the communication between the central dispatching office can not interrupted in central dispatching office.Therefore; with reference to shown in Figure 3; the present invention is applied in this instantiation; promptly in the Networking Design of railway private network; as long as respectively draw an E1, and pass through satellite communication channel (shown in the figure dotted line) interconnection of central dispatching office at the initiating terminal ONU and the terminal ONU of its chain net, just can be in conjunction with the standby E1 between the ONU; form the protection loop of a standby E1, be called the E1 guard ring.Utilize the E1 guard ring, just can realize any main defencive function between the ONU with E1.Represent the main E1 that uses with solid line among the figure, represent standby E1 with E1 so that the dotted line difference is main.
In the E1 guard ring; the satellite communication channel of long distance is crucial, must guarantee the reliable and secure of this communication port, in actual networking; also can consider to adopt the communication mode of other high reliability, realize the 2M E1 interconnection between initiating terminal ONU and the terminal ONU.
East-west according to communication link protection, definition is gone into to E1 (inserting ONU from west to east) and is gone out to E1 (drawing ONU from west to east).For each ONU, the E1 link between the ONU has four kinds: become owner of with E1, go into standby E1, go out to lead with E1 and go out standby E1.Wherein, initiating terminal ONU does not have to become owner of and uses E1, and terminal ONU does not have the main E1 that uses.Except that the standby E1 that goes out of standby E1 of going into of initiating terminal ONU and terminal ONU is the satellite link, standby E1 passes through existing optical transmission system transmission between remaining ONU, can be with main with the shared optical fiber of E1.
Going out standby E1 and going into standby E1 between the ONU is connected to each other by transmission system, forms the loop of a standby E1, in ONU inside, goes into standby E1 and goes out standby E1 and realize interconnection by semipermanent ways of connecting.
Referring to shown in Figure 4, when supposing that optical fiber between ONU B and the ONU C all interrupts, going out of ONU B mainly switched by the control of FPGA with E1, is connected internally to the standby E1 of going out of ONU B; The standby E1 that goes into of ONU C switches by the control of FPGA, is connected internally to becoming owner of of ONU C and uses E1.
Control change action by top two steps; the master that goes out of ONU B uses E1; via the E1 guard ring; make a circulation to be connected to becoming owner of of ONU C and use E1; thereby guaranteed under the situation that optical fiber all interrupts; still for a reliable E1 link is provided between ONUB and the ONU C, and main logic connecting relation with E1 is constant, has guaranteed mainly between ONU B and the ONU C not interrupt with the important service on the E1.
Above-mentioned control handoff functionality; control logic by the field programmable gate array (FPGA:FieldProgrammable Gate Arrays) of ONU inside realizes; the discrepancy of being ONU is active and standby with the switching of the protection between the E1; by the switching and the outside E1 guard ring of inside, realize the transmission protection of E1.
FPGA can be integrated in a large amount of logic functions among the monolithic IC, has advantages such as structure is flexible, reliability is high, developing instrument is advanced, development cost are cheap.In realizing the FPGA that the E1 protection is switched, the alternative data selector is an elementary cell.The alternative data selector can by which signal of control signal decision output in two digital input signals.Switch if in FPGA, will realize the protection of two-way E1, need two data selectors so.Logical circuitry is referring to shown in Figure 5.
Every road E1 signal comprises the sending and receiving two ends.Be fit to the remote E1 signal that transmits, be converted to PCM channel (HW signal) in this locality and handle.Wherein:
PUHW1: the up HW signal of expression 1#E1, the receiving terminal of corresponding 1#E1.
PDHW1: the descending HW signal of expression 1#E1, the transmitting terminal of corresponding 1#E1.
PUHW2: the up HW signal of expression 2#E1, the receiving terminal of corresponding 2#E1.
PDHW2: the descending HW signal of expression 2#E1, the transmitting terminal of corresponding 2#E1.
UHW1: the up HW of 1#E1 correspondence on the expression net sheet.
DHW1: the descending HW of 1#E1 correspondence on the expression net sheet.
UHW2: the up HW of 2#E1 correspondence on the expression net sheet.
DHW2: the descending HW of 2#E1 correspondence on the expression net sheet.
S1: the control signal of first data selector.
S2: the control signal of second data selector.
The input signal of first data selector is: the up HW signal PEUHW1 of 1#E1 and net sheet are given the descending HW signal PDHW2 of 2#E1.Output signal is: the up HW signal of the net sheet UHW1 of the up HW signal of 1#E1 correspondence.
The input signal of second data selector is: the up HW signal PEUHW2 of 2#E1 and net sheet are given the descending HW signal PDHW1 of 1#E1.Output signal is: the up HW signal of the net sheet UHW2 of the up HW signal of 2#E1 correspondence.
Just often S1, S2 are ' O ' (low level), and PUHW1 and UHW1 are straight-through, and PUHW2 and UHW2 are straight-through, only have been equivalent to increase the transmission delay of the up HW of two-way E1 to the net sheet in this case, it should be noted that according to selected device to determine the maximum time-delay that allows.
When the FPGA protection was switched, SO, S1 were ' 1 ' (high level), and this moment, PUHW1 was replaced by PDHW2, and PDHW2 and UHW1 are communicated with, and were equivalent to up HW (receiving terminal) interconnection of descending HW (transmitting terminal) with the 1#E1 of 2#E1; PUHW2 is replaced by PDHW1 simultaneously, and PDHW1 and UHW2 are communicated with, and is equivalent to up HW (receiving terminal) interconnection of descending HW (transmitting terminal) with the 2#E1 of 1#E1.At this moment, the sending and receiving end interconnection of 1#E1 and 2#E1 has realized that in FPGA the protection of two-way E1 is switched.
If 1#E1 is an active link; 2#E1 is a reserve link; after protection is switched so; original 1#E1 loaded service; be transferred on the 2#E1,2#E1 passes through the standby E1 guard ring of net sheet pre-connection again, with the business on the original 1#E1; switch on the E1 guard ring, realized main with the switching of E1 service security.
In the railway private network, adopt E1 guard ring mode that the E1 between the ONU is protected, be a kind of small investment, the simple E1 guard method of realization.Except initiating terminal ONU and terminal ONU respectively take the E1 link of other transmission means; need not to add any equipment; also need not to bury underground standby optical fiber; directly utilize the existing optical transmission system of Access Network; just can form the E1 guard ring; any two masters that face mutually between the ONU on the chain net are protected with E1, can guarantee that the business between the ONU is not interrupted under the situation that optical fiber all interrupts.
The inventive method is not limited to the railway private network, as long as the optical transmission system of communication link protection, all can adopt the inventive method,, solve the contradiction between the cost of investment and system reliability in the optical fiber transmission network simply, easily to make full use of existing equipment, not increase cost of investment.
Claims (6)
1, a kind of communication link protection method of chain-type optical fibre network, the communication link of the optical network unit of described optical fiber transmission network has at least becomes owner of with link, goes into reserve link and go out active link, go out reserve link, wherein, the initiating terminal optical network unit does not have to become owner of uses link, and the distal optical fiber network element does not have the active link of going out; It is characterized in that the method includes the steps of:
The reserve link that goes out of going into reserve link and distal optical fiber network element of initiating terminal optical network unit is drawn respectively, and set up interconnection by a long haul communication passage;
Going out reserve link and going into reserve link between the optical network unit is connected to each other by transmission line, and set up reserve link and go out fixedlying connected of reserve link in that optical network unit is inner, with the loop that long haul communication passage between the reserve link is formed a reserve link that goes out of going into reserve link and distal optical fiber network element of described initiating terminal optical network unit;
Protection by optical network unit inside is switched and described reserve link loop, realizes the protection to any active link between the optical network unit.
2, the communication link protection method of chain-type optical fibre network according to claim 1 is characterized in that: described optical network unit is inner set up go into reserve link and go out the fixedlying connected on the net sheet of reserve link by semipermanent ways of connecting realization.
3, the communication link protection method of chain-type optical fibre network according to claim 1 is characterized in that the protection switching of described optical network unit inside comprises following steps:
When first optical network unit and second optical network unit take place to interrupt, first optical network unit go out the switching controls of active link by a protection switch unit, be connected internally to the reserve link that of this first optical network unit; Becoming owner of with the switching controls of link by a protection switch unit of second optical network unit is connected internally to the reserve link of going into of this second optical network unit.
4, the communication link protection method of chain-type optical fibre network according to claim 3 is characterized in that: described protection switch unit is realized by field programmable gate array.
5, the communication link protection method of chain-type optical fibre network according to claim 1 is characterized in that: described long haul communication passage communication link is via satellite realized.
6, the communication link protection method of chain-type optical fibre network according to claim 1 is characterized in that: described long haul communication passage is realized by optical transmission link.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB991073398A CN1142640C (en) | 1999-05-17 | 1999-05-17 | Communication link protection method for chain-type optical fibre network |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB991073398A CN1142640C (en) | 1999-05-17 | 1999-05-17 | Communication link protection method for chain-type optical fibre network |
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| CN1142640C true CN1142640C (en) | 2004-03-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100345423C (en) * | 2004-12-31 | 2007-10-24 | 华为技术有限公司 | Multiplex section shared loop protecting method |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100377510C (en) * | 2003-06-18 | 2008-03-26 | 华为技术有限公司 | A far-end equipment of passive optical looped network system and method for switching subsystem |
| CN1753336B (en) * | 2004-09-21 | 2011-09-14 | 华为技术有限公司 | Method of improving ring network combination of business restore ability and business protection method |
| CN100385861C (en) * | 2005-09-12 | 2008-04-30 | 中国移动通信集团公司 | Optical fibre access network and its communication protection method |
| CN100456850C (en) * | 2006-05-16 | 2009-01-28 | 华为技术有限公司 | Data-transmitting fault-tolerant method in wireless telecommunication |
| CN101453666B (en) * | 2007-12-07 | 2012-07-04 | 华为技术有限公司 | Main and standby link protection method, loop system and apparatus for passive optical network |
| CN110519146A (en) * | 2019-08-23 | 2019-11-29 | 北京邮电大学 | Service protecting method and controller based on air-ground integrated annular link structure |
| CN112865871B (en) * | 2020-12-31 | 2022-04-01 | 京信网络系统股份有限公司 | Networking method, networking system and communication method of multi-stage remote equipment |
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- 1999-05-17 CN CNB991073398A patent/CN1142640C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100345423C (en) * | 2004-12-31 | 2007-10-24 | 华为技术有限公司 | Multiplex section shared loop protecting method |
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