CN1921357A - Full optical fibre protecting device and method - Google Patents
Full optical fibre protecting device and method Download PDFInfo
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- CN1921357A CN1921357A CNA2006101388804A CN200610138880A CN1921357A CN 1921357 A CN1921357 A CN 1921357A CN A2006101388804 A CNA2006101388804 A CN A2006101388804A CN 200610138880 A CN200610138880 A CN 200610138880A CN 1921357 A CN1921357 A CN 1921357A
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Abstract
The invention relates to a full-fiber protector and relative method, used in Ethernet inactive optical network (EPON). Wherein, said system comprises light terminal, two splitters and several optical network units (ONU); each ONU via two inactive optical network ports (PON) is connected to two splitters; each splitter is connected to two light terminal ports of said light terminal; the full-fiber protector is plugged between two inactive light optical network ports and the user network port of ONU, to send the data received by two inactive light network ports selectively to relative user network port. The invention uses STP/RSTP/MSTP to switch the backup of dual-PON port, and exchanges chip to separate the user network port and inactive optical network port, to improve the light path reliability of ONU in EPON system with low cost.
Description
Technical field
The present invention relates to Ethernet passive optical network (Ethernet over Passive Optical Network is called for short EPON) system, relate in particular to the protection of EPON system; More particularly, the present invention relates to the all-fiber protection Apparatus for () and method therefor among a kind of EPON, belong to network communications technology field.
Background technology
Along with popularizing and the development of broadband application of internet, what more particularly " bandwidth killer " used continues to bring out, make the Access Network bandwidth resources " have too many difficulties to cope with " day by day, in order thoroughly to solve the bandwidth bottleneck of Access Network, Fiber to the home (Fiber To The house is called for short FTTH) as the final ideal of Access Network development, possessed the active demand that realizes in advance and may.The Ethernet passive optical network system is based on the passive optical network technique of gigabit Ethernet, the low cost and the ease for use of Ethernet have been inherited, and the high bandwidth of optical-fiber network, be to realize " cost performance " in Fiber-To-The-Building (Fiber To The Building is called for short FTTB) the numerous technology of type FTTH the highest a kind of.
Ethernet passive optical network (Ethernet over PON is called for short EPON) system is the single fiber bi-directional Optical Access Network of a kind of employing point-to-multipoint (Point to Multipoint is called for short P-to-MP) structure, is made up of the optical line terminal (Optical Line Terminal is called for short OLT) of local side, the optical network unit (Optical Network Unit is called for short ONU) and the Optical Distribution Network (Optical DistributionNetwork is called for short ODN) of user side; EPON is positioned between business network port (Service NetworkInterface is called for short SNI) and the user network port (User Network Interface is called for short UNI), links to each other with subscriber equipment by UNI.
See also Fig. 1, Fig. 1 is the formation schematic diagram of EPON system; As shown in the figure, typical EPON system by OLT, a plurality of ONU (ONU1, ONU2 ... ONUn) and passive optical splitters (Passive Optical Splitter is called for short POS) form.At down direction (OLT is to ONU), the signal that OLT sends is by one 1: the passive optical splitters of n (or cascade of several optical splitters) arrives each ONU.At up direction (ONU is to OLT), the signal of an ONU transmission only can arrive OLT, and can not reach other ONU.OLT is positioned at the central machine room of office side, and ONU is arranged in corridor or user family, connects with POS between them.
When in the EPON system, operating multiple business,, there is the hidden danger of Single Point of Faliure because its network configuration is some tree network structure to multiple spot.Trunk optical fiber produces fault and will cause 32 ONU to produce fault communication simultaneously; particularly use (connecing again below the ONU under the situation of 10 or more users) for the FTTB type; need protect the ONU place circuit of some Very Important Person, to increase the reliability of the ONU among the EPON.
See also Fig. 2, Fig. 2 is the all-fiber protection scheme line schematic diagram about protection EPON system recommendations among the international standard G983.5 of International Telecommunications Union's telecommunication standards group (ITU-T for ITUTelecommunication Standardization Sector) appointment; Passing through shown in the figure provides redundant fiber path to carry out the all-fiber protection structure, make each ONU by two PON ports with two independently optical splitter realize dual-homed the connection, and each optical splitter is connected to two ports of OLT.This connected mode is intended to eliminate the Single Point of Faliure hidden danger in the EPON system, but the practical solutions that does not clearly define this kind protected mode in the figure is a specific implementation how.And, in the industry cycle do not have at present to propose practicable implementation with reference to the mode of this all-fiber protection scheme line yet.
Summary of the invention
At the above-mentioned active demand that the EPON system is protected; purpose of the present invention is for by providing redundant circuit at full optical fiber; ONU place circuit to some Very Important Person provides practicable protection scheme especially, to finish the all-fiber protection switching function of EPON.
In order to realize the foregoing invention purpose, the invention provides a kind of full optical fibre protecting device, it is applied to the Ethernet passive optical network system; This Ethernet passive optical network system comprises optical line terminal, two optical splitters and a plurality of optical network unit, wherein: each optical network unit is connected with two optical splitters respectively by two passive optical network ports, and two optical splitters are connected to two optical line terminal ports of described optical line terminal respectively; Described full optical fibre protecting device specifically comprises: Switching Module; Described optical network unit two passive optical network ports and user network unit port between, handle in order to the break-make of carrying out two passive optical network ports; Control module; Link to each other with two passive optical network ports of optical network unit with described Switching Module respectively, in order to monitoring two passive optical network port operating states, and control described Switching Module and carry out data forwarding.
Preferably, described control module comprises: the loop back processing being module: in order to by the loop back processing being agreement loopback that undertaken of two passive optical network ports of described optical network unit is monitored, and, determine the active and standby of two passive optical network ports with relation according to the loopback monitoring result; Fault processing module: whether produce fault with the pairing master of passive optical network port with optical link in order to monitor the master according to protective standard, and if produce fault, finish active and standby switching by active and standby switching with optical link with passive optical network port.
Preferably, described protective standard is the mark whether optical network unit is registered to optical line terminal.
Preferably, described loop back processing being agreement is Spanning-Tree Protocol, RSTP, Multiple Spanning Tree Protocol or custom protocol.
Preferably, described Switching Module is the switching equipment of Ethernet.
The present invention also provides a kind of all-fiber protection method, and it is applied to the Ethernet passive optical network system; This Ethernet passive optical network system comprises optical line terminal, two optical splitters and a plurality of optical network unit, wherein: each optical network unit is connected with two optical splitters respectively by two passive optical network ports, and two optical splitters are connected to two optical line terminal ports of described optical line terminal respectively; Described all-fiber protection method comprises whether the monitoring master produces fault with optical link; If the generation fault is switched the active and standby with the step that concerns of described two passive optical network ports according to the loop back processing being agreement.
Preferably; described all-fiber protection method also comprises the active and standby state of using of determining two passive optical network ports of described optical network unit according to the loop back processing being agreement, and the step of carrying out the transmission of data with the pairing master of main passive optical network port with optical link.
Preferably, describedly determine that according to the loop back processing being agreement the active and standby step with state of two passive optical network ports of described optical network unit specifically comprises the steps:
Step 11: on the main frame of optical network unit, start the loop back processing being agreement;
Step 12:, two passive optical network ports of described optical network unit are arranged at conducting state according to the loop back processing being agreement;
Step 13: according to the loop back processing being agreement, two passive optical network ports of described optical network unit are registered to described optical line terminal respectively;
Step 14: between described optical line terminal and optical network unit, carry out the transmission of data via full optical fibre protecting device;
Step 15:, two passive optical network ports of described optical network unit are carried out the loopback monitoring according to the loop back processing being agreement;
Step 16: if described two passive optical network ports have formed loop, execution in step 18; Otherwise, execution in step 17;
Step 17: described two pairing optical links of passive optical network port all transmit data, execution in step 15;
Step 18: determine the active and standby of two passive optical network ports, block standby passive optical network port with relation; Execution in step 15.
Preferably, described monitoring master is specially with the step whether optical link produces fault: according to predetermined monitoring time at interval, monitor described main login state with optical network unit in the optical link; If do not monitor the monomark of optical network unit, determine that the master produces fault with optical link.
Preferably, the described active and standby step with relation of switching described two passive optical network ports according to the loop back processing being agreement specifically comprises: block and produce the main with the pairing passive optical network port of optical link of fault; And open the pairing passive optical network port of standby optical link, and use new master to carry out the step of transfer of data with optical line terminal.
Preferably, described loop back processing being agreement is Spanning-Tree Protocol, RSTP, Multiple Spanning Tree Protocol or custom protocol.
The invention has the advantages that; the present invention finishes the backup switch operating of double-PON port by STP (Spanning-Tree Protocol)/RSTP (RSTP)/MSTP (Multiple Spanning Tree Protocol)/custom protocol; realized the all-fiber protection scheme of EPON system; strengthen the whole optical fiber optical link automatically restoring fault function of this EPON system, and then improved the reliability of this EPON system.
Another advantage of the present invention is, the present invention is when implementing the technical scheme of protection EPON system, isolate the user network port (User Network Interface is called for short UNI) of ONU and EPON (Passive Optical Network the is called for short PON) port of ONU by exchange chip, promptly do not influence the configuration and the annexation thereof of subscriber equipment during the PON port switching of ONU; And can adopt ripe commercial Ethernet switching chip as the Switching Module in the all-fiber protection switching device of the present invention, make that easy realization of technical solution of the present invention and realization cost are lower.
Further advantage of the present invention is that according to Theoretical Calculation, by this kind mode, service outage duration reduces to original 5.71e5 (5/100000ths July 1st).This shows that the present invention has improved the reliability of specific ONU optical link in the EPON system, increased ONU optical link automatically restoring fault function, reduced the repair time of ONU optical link fault.
Description of drawings
Fig. 1 is the formation schematic diagram of EPON system;
Fig. 2 is an all-fiber protection scheme line schematic diagram;
Fig. 3 is the all-fiber protection scheme hardware configuration schematic diagram of the embodiment of the invention;
Fig. 4 be the embodiment of the invention full optical fibre protecting device structural representation and with the annexation schematic diagram of optical network unit;
Fig. 5 is the flow chart of the all-fiber protection method of the embodiment of the invention;
The ONU workflow schematic diagram with two PON port backups of Fig. 6 embodiment of the invention.
Embodiment
See also Fig. 3, Fig. 3 is an all-fiber protection scheme hardware configuration schematic diagram; As shown in the figure, this EPON system by one comprise the optical line terminal of two optical line terminal ports (OLT# 1, OLT#2), two optical splitters and a plurality of optical network unit (ONU#1, ONU#2, ONU#3 ... ONU#n) form, wherein: each optical network unit (ONU#1, ONU#2, ONU#3 ... ONU#n) by two passive optical network ports (PON# 1, PON#2) respectively with along separate routes than being 1: two optical splitters of n are connected, and each optical splitter is connected to two optical line terminal ports (OLT# 1, OLT#2) of described optical line terminal.Different with Fig. 2 is, each optical network unit (ONU#1, ONU#2, ONU#3 ... ONU#n) be plugged with full optical fibre protecting device between two passive optical network ports (PON# 1, PON#2) and the user network port; This full optical fibre protecting device is selected the user network port that a ground sends to this data correspondence in order to the data that two passive optical network ports (PON# 1, PON#2) with optical network unit receive.
See also Fig. 4, Fig. 4 be the embodiment of the invention full optical fibre protecting device structural representation and with the annexation schematic diagram of optical network unit; As can be seen from the figure, each optical network unit (ONU#1, ONU#2, ONU#3 ... ONU#n) two passive optical network ports (PON# 1, PON#2) link to each other with two optical-fiber network subelements (ONU #1, ONU #2) respectively.Described full optical fibre protecting device specifically comprises Switching Module and control module.
The Switching Module that comprises in the full optical fibre protecting device, two the optical-fiber network subelements (ONU #1, ONU #2) that are positioned at each optical network unit that need protect and user network port (UNI1, UNI2 ... UNIn) between, handle in order to the break-make of the passive optical network port (PON# 1, PON#2) that carries out optical network unit; Be the data that Switching Module receives two passive optical network ports (PON# 1, PON#2) of same ONU; can pass through a user network port (UNI mouth) and communications of user equipment; and when two passive optical network ports (PON# 1, PON#2) protection of ONU is switched, need not carry out reconfiguring of the downlink physical network port.
The control module that comprises in the full optical fibre protecting device; link to each other with two passive optical network ports (PON# 1, PON#2) of optical network unit with described Switching Module respectively; in order to monitoring two passive optical network port operating states, and control described Switching Module and carry out data forwarding.Control module comprises: loop back processing being module and fault processing module.The loop back processing being module in order to by the loop back processing being agreement to two passive optical network ports of described optical network unit carry out the loopback monitoring, and, determine the active and standby of two passive optical network ports with relation according to the loopback monitoring result; Whether fault processing module produces fault with the pairing master of passive optical network port with optical link in order to monitor the master according to protective standard, and if produce fault, finish active and standby switching by active and standby switching with optical link with passive optical network port.
It should be noted that, when the use of reality, because Ethernet exchange design cost is lower, therefore above-mentioned Switching Module can also use uni port (user network port) exchange chip of cascade (or equipment) at the ONU chip to realize, at this moment, the uni port of ONU chip connects from exchange chip; Ethernet switching chip or equipment (LanSwitch) are the equipment of MAC layer, and it can realize the clog-free intercommunication between all of the port by to going into the mechanism such as source address study of message, just realizes the exchange of Ethernet message frame between each port.Ethernet switching chip is a mature technique, does not repeat them here.
In addition, exchange chip and ONU chip can be incorporated on the veneer, also can use the different veneer of polylith to realize by the backboard ways of connecting.And if the ONU main frame is the switch that possesses loop back processing being agreement (for example for STP/RSTP/MSTP) function, then can increase extra hardware device again.
See also Fig. 5, Fig. 5 is the flow chart of the all-fiber protection method of the embodiment of the invention; Described all-fiber protection method specifically comprises:
Step 1: by the loop back processing being agreement, determine the active and standby state of using of two passive optical network ports of described optical network unit, and the transmission of carrying out data with the pairing master of main passive optical network port with optical link;
Step 2: whether produce fault with optical link according to the monitoring of loop back processing being agreement is main; If the generation fault, execution in step 3, otherwise, execution in step 1;
Step 3: switch the active and standby of described two passive optical network ports with relation according to the loop back processing being agreement.
The loop back processing being agreement of the use in step 1 is the method by a kind of control loop of loop back processing being module execution.Because the Ethernet data switch mode has adopted based on MAC Address and has been implemented in data forwarding mechanism between the different port, each port correspondence be the network segment of an Ethernet, the mode of the mac address table by learning each port, switching equipment is only transmitted the communication between different port.In order to realize management to redundant link, find out the redundant link of existence, must use the loop back processing being agreement to follow the tracks of available path.If find to have redundant path, will select optimal path to carry out packet and transmit, and block other redundant link.
The loop back processing being agreement can be Spanning-Tree Protocol (STP), RSTP (RSTP), Multiple Spanning Tree Protocol (MSTP) or custom protocol.For example, Spanning-Tree Protocol (Spanning Tree) is defined among the IEEE 802.1D, and it is a kind of LMP Link Manager Protocol, and path redundancy is provided and prevents to produce loop for network.Spanning-Tree Protocol (STP) be by spanning tree algorithm (Spanning TreeAlgorithm is called for short STA) calculate one from each optical network unit (ONU#1, ONU#2, ONU#3 ... ONU#n), avoid and eliminate loop in the network via the loop free path of two optical splitters to optical line terminal port (OLT# 1, OLT# 2).In this way, it guarantees all have only unique path to each destination, can not produce loop, thereby reaches the purpose of managing redundant link.
Loop back processing being module among the present invention realizes the loopback monitoring by operation STP/RSTP/MSTP agreement on OLT main frame and ONU host CPU; All can work and form loop in case monitoring result is two passive optical network ports (PON# 1, PON#2) of optical network unit, the ONU main frame places Blocking (obstruction) state with the switching chip port that the back connects passive optical network port (the being assumed to be PON#2) correspondence that goes up ring; At this moment loop is cut off, and this passive optical network port (PON#2) is in stand-by state; The pairing optical link of another passive optical network port (PON#1) is set to the master and uses optical link, is in conducting state and carries out transfer of data.
See also Fig. 6, the ONU workflow schematic diagram with double-PON port backup of Fig. 6 embodiment of the invention.Specifically, described step 1 specifically comprises the steps:
Step 11: on the main frame of optical network unit, start loop back processing being agreement (STP/RSTP/MSTP/ custom protocol);
Step 12:, two passive optical network ports (PON# 1, PON#2) of described optical network unit are arranged at conducting state according to the loop back processing being agreement;
Step 13: according to the loop back processing being agreement, two passive optical network ports (PON# 1, PON#2) of described optical network unit are registered to described optical line terminal respectively;
Step 14: between described optical line terminal and optical network unit, carry out the transmission of data via full optical fibre protecting device;
Step 15:, two passive optical network ports (PON# 1, PON#2) of described optical network unit are carried out the loopback monitoring according to the loop back processing being agreement;
Step 16: if described two passive optical network ports (PON# 1, PON#2) have formed loop, execution in step 18; Otherwise, execution in step 17;
Step 17: the pairing optical link of described two passive optical network ports (PON# 1, PON#2) all transmits data, execution in step 15;
Step 18: determine the active and standby of two passive optical network ports (PON# 1, PON#2), and block standby passive optical network port with relation; Execution in step 15.
The choice criteria of the standby passive optical network port in the above-mentioned steps 18 for example can be a back pairing switching port of ONU subelement that adds loop.
Whether fault processing module of the present invention is in order to produce fault according to the protective standard monitoring is main with optical link; if and main produced fault with optical link, then it would be finished by active and standby switching with passive optical network port and active and standbyly realizes that with switching of optical link the nothing interruption of data transmits.In the present embodiment, protective standard is the mark whether optical network unit is registered to optical line terminal; Loop back processing being agreement (for example STP) is monitored described main login state with optical network unit in the optical link according to predetermined monitoring time at interval; If do not monitor the monomark of optical network unit, determine that the master produces fault with optical link.
Suppose that the master breaks down with passive optical network port (PON#1), cause the STP/RSTP/MSTP agreement obstructed, then the STP agreement produces the main with the pairing passive optical network port of optical link (PON#1) of fault with self-blocking; Open the passive optical network port (PON#2) of the pairing optical network unit of standby optical link; And use new master to carry out transfer of data with optical line terminal.That is to say, the STP consultation automatically standby passive optical network port (PON#2) is in the Blocking state the PON internal port will according to agreement transfer to successively listening learning Forwarding (intercepting/address learning/data forwarding) state, and the control Switching Module carries out active and standby switching with passive optical network port, thereby has realized the active and standby switch function with optical link of ONU.
Though the present invention discloses as above with preferred embodiment; so it is not in order to limit scope of the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking appended the scope that claim defined.
Claims (11)
1, a kind of full optical fibre protecting device, it is applied to the Ethernet passive optical network system;
This Ethernet passive optical network system comprises optical line terminal, two optical splitters and a plurality of optical network unit, wherein: each optical network unit is connected with two optical splitters respectively by two passive optical network ports, and two optical splitters are connected to two optical line terminal ports of described optical line terminal respectively; It is characterized in that:
Described full optical fibre protecting device comprises:
Switching Module; Described optical network unit two passive optical network ports and user network unit port between, handle in order to the break-make of carrying out two passive optical network ports;
Control module; Link to each other with two passive optical network ports of optical network unit with described Switching Module respectively, in order to monitoring two passive optical network port operating states, and control described Switching Module and carry out data forwarding.
2, full optical fibre protecting device according to claim 1 is characterized in that, described control module comprises:
The loop back processing being module: in order to by the loop back processing being agreement to two passive optical network ports of described optical network unit carry out the loopback monitoring, and, determine the active and standby of two passive optical network ports with relation according to the loopback monitoring result;
Fault processing module: whether produce fault with the pairing master of passive optical network port with optical link in order to monitor the master according to protective standard, and if produce fault, finish active and standby switching by active and standby switching with optical link with passive optical network port.
3, full optical fibre protecting device according to claim 2 is characterized in that, described protective standard is the mark whether optical network unit is registered to optical line terminal.
According to claim 2 or 3 described full optical fibre protecting devices, it is characterized in that 4, described loop back processing being agreement is Spanning-Tree Protocol, RSTP, Multiple Spanning Tree Protocol or custom protocol.
5, full optical fibre protecting device according to claim 1 is characterized in that, described Switching Module is the switching equipment of Ethernet.
6, a kind of all-fiber protection method, it is applied to the Ethernet passive optical network system;
This Ethernet passive optical network system comprises optical line terminal, two optical splitters and a plurality of optical network unit, wherein: each optical network unit is connected with two optical splitters respectively by two passive optical network ports, and two optical splitters are connected to two optical line terminal ports of described optical line terminal respectively;
It is characterized in that described all-fiber protection method comprises:
Whether monitoring is main produces fault with optical link; If the generation fault is switched the active and standby with relation of described two passive optical network ports according to the loop back processing being agreement.
7, all-fiber protection method according to claim 6; it is characterized in that; also comprise the active and standby state of using of determining two passive optical network ports of described optical network unit according to the loop back processing being agreement, and the step of carrying out the transmission of data with the pairing master of main passive optical network port with optical link.
8, all-fiber protection method according to claim 7 is characterized in that, describedly determines that according to the loop back processing being agreement the active and standby step with state of two passive optical network ports of described optical network unit specifically comprises the steps:
Step 11: on the main frame of optical network unit, start the loop back processing being agreement;
Step 12:, two passive optical network ports of described optical network unit are arranged at conducting state according to the loop back processing being agreement;
Step 13: according to the loop back processing being agreement, two passive optical network ports of described optical network unit are registered to described optical line terminal respectively;
Step 14: between described optical line terminal and optical network unit, carry out the transmission of data via full optical fibre protecting device;
Step 15:, two passive optical network ports of described optical network unit are carried out the loopback monitoring according to the loop back processing being agreement;
Step 16: if described two passive optical network ports have formed loop, execution in step 18; Otherwise, execution in step 17;
Step 17: described two pairing optical links of passive optical network port all transmit data, execution in step 15;
Step 18: determine the active and standby of two passive optical network ports, block standby passive optical network port with relation; Execution in step 15.
9, all-fiber protection method according to claim 6 is characterized in that, described monitoring master is specially with the step whether optical link produces fault:
According to predetermined monitoring time at interval, monitor described main login state with optical network unit in the optical link; If do not monitor the monomark of optical network unit, determine that the master produces fault with optical link.
10, all-fiber protection method according to claim 6 is characterized in that, the described active and standby step with relation of switching described two passive optical network ports according to the loop back processing being agreement specifically comprises the steps:
Block and produce the main of fault with the pairing passive optical network port of optical link;
Open the pairing passive optical network port of standby optical link, use new master to carry out transfer of data with optical line terminal.
11, according to claim 6,7,8,9 or 10 described all-fiber protection methods, it is characterized in that described loop back processing being agreement is Spanning-Tree Protocol, RSTP, Multiple Spanning Tree Protocol or custom protocol.
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