CN102006213B - Parallel sending and selective receiving adverse bidirectional 2M ring and design method thereof - Google Patents

Parallel sending and selective receiving adverse bidirectional 2M ring and design method thereof Download PDF

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Publication number
CN102006213B
CN102006213B CN2010105472640A CN201010547264A CN102006213B CN 102006213 B CN102006213 B CN 102006213B CN 2010105472640 A CN2010105472640 A CN 2010105472640A CN 201010547264 A CN201010547264 A CN 201010547264A CN 102006213 B CN102006213 B CN 102006213B
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node
data
ring
logical channel
cycle
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CN102006213A (en
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任忠惠
金兰
钱成磊
张婷
戴海荣
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Hangzhou Xin Ke Information Technology Co., Ltd.
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Hangzhou CNCR-IT Co Ltd
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Abstract

The invention relates to a parallel sending and selective receiving adverse bidirectional 2M ring and a design method thereof. The current 2M ring cannot realize bidirectional adverse transmission and environmental protection, can only realize chain shape protection, and cannot realize single-ring networking. For the 2M ring of the invention, the central node is connected with each base station node through 2M channels; a logical channel is formed on the outer sides and the inner sides of all 2M channels respectively; the logical channels of the outer sides and the inner sides are mutually adverse in direction; the logical channel of the outer sides and the logical channel of the inner sides are divided into three parts by taking time slot as a unit, including a network tube, an uplink and a downlink; any one logical channel of the logical channels of the outer sides and the inner sides can realize bidirectional non-uniform routing transmission between the central node and the base station node; and the simultaneous working of the logical channel of the outer sides and the logical channel of the inner sides can realize the parallel sending and selective receiving adverse bidirectional 2M ring. The parallel sending and selective receiving adverse bidirectional 2M ring makes two completely independent data trends exist between each base station node and the central node to realize backup transmission of data.

Description

Converse two-way 2M ring and method for designing thereof are received in a kind of concurrent choosing
Technical field
The invention belongs to SDH data communication and loop network framework technical field, relate to a kind of concurrent choosing and receive converse two-way 2M ring and method for designing thereof.
Background technology
At present in the base station information transformation and rotating ring monitoring project of operator, with SDH (synchronous transmission system) down 2M be that the transmission means of medium generally has three kinds: point-to-point 2M form transmission means, take out slotted mode and 2M encircles networking mode based on the back slotting 64K of BSC (base station controller) and BTS (base station transceiver).Wherein under the situation of the nervous relatively requirement again of 2M resource monitoring independent transmission networking, often adopt 2M ring networking mode.In the networking of 2M ring, application 2 M is connected with each other between center and node, and the shared 2M bandwidth of each node generally needs to gather serial data and ether data.In the transmission system of various 2M annular networking modes; Having according to time slot is that unit extracts serial data respectively and the ether data are encircled the central apparatus form to 2M; Also have and adopt Ethernet switch cascade makeup ring and select one of them port convergence at the center layer by layer; Its essential method for designing all is a chain, even if physically become annular but in logic according to chain work.Such design can not really realize the transmitted in both directions and the ring protection of 2M ring, can only realize the chain protection, and can not realize the monocycle networking.
Summary of the invention
The objective of the invention is to deficiency, provide a kind of concurrent choosing to receive converse two-way 2M ring and method for designing thereof to prior art.
In order to realize the foregoing invention purpose, the technical scheme that the present invention adopts is following:
Converse two-way 2M ring is received in a kind of concurrent choosing, and in the networking of 2M ring, Centroid links to each other through the 2M passage with each base-station node, and the outside of all 2M passages and inboard constitute a logical channel respectively, and the outside is converse each other on direction with inboard logical channel; Outside logical channel and inboard logical channel all are that unit is divided into three parts with the time slot; Comprise webmaster, descending and up; Outside logical channel and arbitrary logical channel in the inboard logical channel all can realize the transmission of the two-way non-consistent route between Centroid and base-station node, and outside logical channel and inboard logical channel are worked simultaneously and just can be realized that concurrent choosing receives converse two-way 2M and encircle; Adopt ring protection mechanism to guarantee the reliability of 2M loop data transmission.
What described outside logical channel and inboard logical channel all with the time slot were that the tripartite method of unit adopts is the FPGA designing technique, according to standard G.704 with the time slot segmentation of 2M passage: the 31st time slot is fixed for webmaster; Individual (N is a timeslot number, the 1≤N≤30) time slot of the 1st～N is defined as up, promptly from the direction of each base-station node to Centroid; N～30 time slots are defined as descending, both from Centroid to the base-station node direction.
The method for designing that converse two-way 2M ring is received in a kind of concurrent choosing specifically comprises webmaster design mechanism, ring protection mechanism and data choice mechanism.
Described webmaster design mechanism is specifically:
31st time slot of Centroid on the 2M loop is that unit sets up self-defined short frame with 16 bytes, and every 16 continuous short frames are a node cycle T 1, every 32 continuous node cycles are a loop cycle T 2, by the time of a byte transmission be that a 2M frame period is 125us, node cycle T then 1=16 * 125 μ s * 16=32ms, a loop cycle T 2=32 * T 1=1024ms, the sequence number in the node cycle that it comprises is 0～31, the short frame number in each node cycle is 0～15.
Sequence number is that No. 0 short frame in node cycle of 0～30 is that network configuration is obtained frame, is used to obtain the node ID and the state of network configuration; No. 8 short frame is used for node control, comprises the id information and the control information of Be Controlled node; The 1st～No. 7 short frame and the 9th～No. 15 short frame are used for the self-defined expense of loop node.
Sequence number is that No. 0 short frame and No. 8 short frame in node cycle of 31 is used for system broadcasts, realizes the control of whole loop consistency operation; The 1st～No. 7 short frame and the 9th～No. 15 short frame are used for the self-defined expense of loop node.
Each base-station node reaches with the center through the 2M passage and links to each other to each other; Connect on having the 2M port with under connect the 2M port; The mode of node processing data is that clock continues biography and the add drop multiplex mode along the road; Send from other 2M port if this node of data that had both received does not use, promptly data flow direction be last connect 2M port RX (receiving terminal) under connect 2M port TX (transmitting terminal), connect 2M port RX to the last 2M of company port TX down; After node receives network management data, successively at loop cycle T 2The 0th～No. 30 node cycle in extract network configuration and obtain frame; If certain network obtains ID and state information that frame has carried certain node; This node obtains frame to this network and is left intact, and does not carry any information if this network obtains frame, then the ID of this node and state information is obtained frame at this network and uploads; And be provided with and uploaded sign, guarantee at T 2Do not repeat to upload the ID and the state information of this node before the end cycle.According to said method, loop cycle T 2The 2M logical channel that finishes the back either side can both get access to the whole network structural information, and sends back the center by converse ring respectively.
Described ring protection mechanism is realized by following steps:
Step 1. node port produces the reception Synchronize Alarm or 2M encircles alarm signal certainly;
Step 2. with the TX and the RX short circuit of this node port, had both realized loopback in fpga chip inside in inside, make the data-signal that is delivered to this node port from the center reverse end for end herein to center pathway by;
Step 3. the tune to center pathway by direction on, in webmaster node cycle T 1The 1st～No. 7 and the 9th～No. 15 short frame in place the protection changeover signal; The protection changeover signal is that through any one node cycle the 1st～No. 7 transmitted with the 9th～No. 15 short frame, confirms that in 64ms completion protects switch function;
Step 4. tune to center pathway by direction on, network management information is transferred to adjacent node, parses the protection changeover signal from the 1st～No. 7 of the node cycle and the 9th～No. 15 short frame, adjacent node is transferred to next node with the signal that receives;
Step 5. repeating step 4, to the last node with transfer of data till the center.
Described data choice mechanism is specifically:
Can realize that by webmaster design mechanism and ring protection mechanism the converse two-way ring protection function 2M that has encircles; Network topology structure with forms such as dicyclo, monocycle, two strands, strands; The center still is that node all has two data sources selective, but and the transmission means in design data source.
Described data source selects to comprise that centre data is selected and node data is selected, and centre data selects to adopt following selection strategy:
Select 1. dicyclo direction ID quantity identical and comprise mutually, then be judged as the dicyclo topology, this moment, outer loop data was got at the center;
Select the many rings of 2. dicyclo direction ID quantity differences and ID quantity to comprise the few ring of ID quantity, then be judged as the monocycle topology, this moment, the direction of the many rings of ID quantity was got at the center;
Select 3. dicyclo direction ID quantity no matter whether identical,, then be judged as the chain topology as long as do not comprise mutually; If a certain direction ID quantity is 0, then be the strand topology; The ID quantity of dicyclo direction is double-stranded topology greater than 0 all, selects this moment all to fetch data from twocouese.
Node data is selected specifically: fetch data from a direction forever, but send data from both direction.
For concrete data source transmission means and content can according to the independence of upstream and downstream bandwidth with utilize node cycle 1～7 and 9～15 short frames to do to cooperate to design, concrete mode is following:
It is the mode of utilizing of unit that mode 1. adopts with the uplink and downlink timeslot, and both up several slots and descending several slots can adopt the mode of various separations and combination to supply certain point or some spots to use;
Mode 2. adopts up-downgoing to share the mode of utilizing of overall bandwidth, has both adopted layout strategy to realize each nodes sharing bandwidth resources, can adopt custom protocol form or standard agreement form;
The combination of mode 3. above-mentioned dual modes.
Through webmaster is machine-processed, ring protection is machine-processed and the design of data choice mechanism, the present invention has embodied following characteristics generally:
Characteristics 1. are utilized the logic outer shroud and the interior ring of the logic composition data passage of 2M loop network type of attachment; Realize converse dicyclo; Any one logical loops with it with the time slot is that unit is divided in design up, descending and three kinds of Business Streams of webmaster, monocycle can the realization center and node between two-way communication;
Characteristics 2. adopt the basic transformat of periodically short frame as the webmaster Business Stream, and a short frame is 16 bytes, and 16 short frames constitute 1 node cycle, and 32 node cycles constitute a loop cycle; Short frame type is divided into and obtains the short frame of network configuration, the short frame of Control Node, the short frame of short frame of system broadcasts and self-defined expense;
3. 1 loop cycle of characteristics are 1048ms, can realize the scanning of whole loop topology, 31 of topology design maximum nodes through a loop cycle;
Characteristics 4. designs are switched with protection, and ring is judged as main ring protection mechanism certainly, can make dicyclo be implemented in the switching between ring and the chain, and switching time is less than 64ms;
Characteristics 5. centers and each node be all by concurrent debit's formula deal with data of selecting, and the short frame overhead of upstream and downstream bandwidth passage and webmaster can supply to design concrete data traffic transmission mode, as based on the time slot segmentation or based on bandwidth sharing.
Adopt the 2M loop of the present invention's design to have following effect:
Effect 1. converse two-way 2M loops make all has fully independently two data trends between each base-station node and the Centroid, can realize the backup transmission of data.
Effect 2. design ring protection mechanism make loop when alarm and 2M loopback take place, can realize the transmission of ring protection form.
Effect 3. can be obtained loop topology fully, provides the webmaster expense that loop is carried out Long-distance Control and management.
Effect 4. provides independently data transmission channel of center and node up-downgoing, can be according to concrete professional design transmission means.
Description of drawings
Fig. 1 is 2M ring networking logic diagram;
Fig. 2 is the non-consistent route sketch map of 2M monocycle;
Fig. 3 is the ring protection schematic diagram of mechanism.
Embodiment
Below in conjunction with accompanying drawing the present invention is further explained.
The networking logic of 2M ring is as shown in Figure 1; Center and node A, B, C couple together through the 2M circuit each other; Both the center passed the upwards transmission port that port meets node A down; The following biography port of node A connects the upwards transmission port of Node B, and the following biography port of final node C turns back to the upwards transmission port at center, has used 2M-1 to 2M-4 respectively.Because the 2M circuit is that TX and RX are two-way, can find out obviously from figure 2M-1 is connected and composed a logic outer shroud to all TX lines of 2M-4 that all RX connect and compose ring in the logic, and two to encircle be converse each other.
A 2M is made up of 32 time slots, and wherein the 0th time slot is that 2M frame synchronization is used, and it is used that all the other time slots are used to transmit data.
Time slot 0 Time slot 1～N (up) Time slot N～30 (descending) Time slot 31
As above shown in the table, the present invention is divided into three parts with 1～31 time slot, i.e. webmaster, down going channel and data feedback channel.Network management path is fixedly selected 31 time slots for use; Data feedback channel and down going channel have variable element N, and (N is a timeslot number; 1≤N≤30) adjustment; Data feedback channel dactylus point is to center position, and down going channel refers to middle mind-set node direction, adopts such time slot segmentation mode between realization center on the one-sided logic box and node, to transmit according to non-consistent route.Node B with Fig. 2 is an example; The data that the center sends to Node B arrive Node B from down going channel through node A; Routed path be the center-node A-Node B; Node B arrives center from data feedback channel through node C to the data at center, routed path be Node B-node C-center, their routed path is different.The described 2M ring of Fig. 1 logical channel possesses two converse each other loops; Each node that then encircles when the monocycle bidirectional transmission method design of all adopting non-consistent route all possesses two data sending directions and two data receive directions, can design the 2M ring that converse two-way, concurrent choosing is received.
Realize that the inventive method specifically comprises webmaster design mechanism, ring protection mechanism and data choice mechanism.
Described webmaster design mechanism is specifically:
Adopt fixedly that time slot 31 is used for webmaster, its objective is the node that obtains on network configuration and the Control Network, provide the webmaster expense to supply the node use, provide ring protection mechanism to make the loop still can proper communication under abnormal conditions.
31st time slot of Centroid on the 2M loop is that unit sets up self-defined short frame with 16 bytes, and every 16 continuous short frames are a node cycle T 1, every 32 continuous node cycles are a loop cycle T 2, by the time of a byte transmission be that a 2M frame period is 125us, node cycle T then 1=16 * 125 μ s * 16=32ms; A loop cycle is T 2=32 * T 1=1024ms, the sequence number in the node cycle that it comprises is 0～31, the short frame number in each node cycle is 0～15.
Sequence number is that No. 0 short frame in node cycle of 0～30 is that network configuration is obtained frame, is used to obtain the node ID and the state of network configuration; No. 8 short frame is used for node control, comprises the id information and the control information of Be Controlled node; The 1st～No. 7 short frame and the 9th～No. 15 short frame are used for the self-defined expense of loop node.
Sequence number is that No. 0 short frame and No. 8 short frame in node cycle of 31 is used for system broadcasts, realizes the control of whole loop consistency operation; The 1st～No. 7 short frame and the 9th～No. 15 short frame are used for the self-defined expense of loop node.Its project organization is as shown in the table:
Frame head Short frame 0 of node cycle 0～30: network configuration frame Postamble
Frame head Short frame 1～7 of node cycle 0～30: node expense frame Postamble
Frame head Short frame 8 of node cycle 0～30: node control frame Postamble
Frame head Short frame 9～15 of node cycle 0～30: node expense frame Postamble
Frame head Short frame 0 of node cycles 31: system broadcasts frame Postamble
Frame head Short frame 1～7 of node cycles 31: node expense frame Postamble
Frame head Short frame 8 of node cycles 31: node control frame Postamble
Frame head Short frame 9～15 of node cycles 31: node expense frame Postamble
Each node reaches with the center through the 2M passage and links to each other to each other; Connect on having the 2M mouth with under connect the 2M mouth; The mode of node processing data is that clock continues biography and the add drop multiplex mode along the road; If this node of data that had both received does not use then sends from other port, promptly data flow direction be last connect 2M mouth RX (receiving terminal) under connect 2M mouth TX (transmitting terminal), connect 2M mouth RX to the last 2M of company mouth TX down; After node receives network management data, successively at loop cycle T 2The 0th～No. 30 node cycle in extract network configuration and obtain frame; If certain network obtains ID and state information that frame has carried certain node; This node obtains frame to this network and is left intact, and does not carry any information if this network obtains frame, then the ID of this node and state information is obtained frame at this network and uploads; And be provided with and uploaded sign, guarantee at T 2Do not repeat to upload ID and state information before the end cycle.According to said method, loop cycle T 2The 2M logical channel that finishes the back either side can both get access to the whole network structural information, and sends back the center by converse dicyclo respectively.
Can realize that by above-mentioned webmaster mechanism converse dicyclo also can obtain the network configuration of ring; But realize that prerequisite is that whole loop is unimpeded; When node of loop or a plurality of node breaks, synchronization loss, certainly during phenomenon such as ring, will produce the abscission ring phenomenon, therefore need design ring protection mechanism.
Realize by following steps in conjunction with the described ring protection mechanism of Fig. 3:
Pass port under step 1. Node B and produce the reception Synchronize Alarm, node C upwards transmission port produces 2M from the ring alarm;
The fpga chip inside of step 2. Node B will pass down TX-pass down the RX short circuit, the both inner data-signal of realizing that loopback makes from center outer shroud be delivered to this node reverse end for end herein from interior hoop center pathway by; In node C then directly produces the data of ring to outer ring by;
The following biography RX of step 3. Node B-upload 1～No. 7 of the TX direction with 9～No. 15 short frames in placement protection switch sign; Node C upload RX-pass down 1～No. 7 of the TX direction with 9～No. 15 short frames in placement protection switch sign;
The both interior ring direction of the following biography RX of step 4. node A receives the information from Node B, from short frame, parses the protection changeover signal, and then node A will pass RX down and upload the direct short circuit of TX in fpga chip inside; Node C is owing to directly arrive the center, if follow-up node is arranged then carry out the identical operations with node A;
The TX signal of uploading of step 5. node A is delivered to the center.
Described data choice mechanism is specifically:
Can realize that by webmaster design mechanism and ring protection mechanism the converse two-way ring protection function 2M that has encircles; Network topology structure with forms such as dicyclo, monocycle, two strands, strands; The center still is that node all has two data sources selective, but and the transmission means in design data source.
Described data source selects to comprise that centre data is selected and node data is selected, and centre data selects to adopt following selection strategy:
Select the ID quantity of 1. dicyclo directions identical and comprise mutually and then be judged as the dicyclo topology, this moment, outer loop data was got at the center;
Select 2. dicyclo direction ID difference and many ID ring to comprise few ID ring and then be judged as the monocycle topology, this moment, many ID ring directions were got at the center;
Select 3. dicyclo direction ID quantity no matter whether identical, then be not judged as the chain topology as long as do not comprise mutually; If a certain direction ID quantity is 0, then be the strand topology; The ID quantity of dicyclo direction is double-stranded topology greater than 0 all, selects this moment all to fetch data from twocouese.
Node data is selected specifically: fetch data from a direction forever, but send data from both direction.
For concrete data source transmission means and content can according to the independence of upstream and downstream bandwidth with utilize node cycle 1～7 and 9～15 short frames to do to cooperate to design, but hereby is following:
It is the mode of utilizing of unit that mode 1. adopts with the uplink and downlink timeslot, and both up several slots and descending several slots can adopt the mode of various separations and combination to supply certain point or some spots to use;
Mode 2. adopts up-downgoing to share the mode of utilizing of overall bandwidth, has both adopted layout strategy to realize each nodes sharing bandwidth resources, can adopt the custom protocol form, also can adopt standard agreement form such as Ethernet protocol;
The combination of mode 3. above-mentioned dual modes.
Through webmaster is machine-processed, ring protection is machine-processed and the design of data choice mechanism, the present invention has embodied following characteristics generally:
Characteristics 1. are utilized the logic outer shroud and the interior ring of the logic composition data passage of 2M loop network type of attachment; Realize converse dicyclo; Any one logical loops with it with the time slot is that unit is divided in design up, descending and three kinds of Business Streams of webmaster, monocycle can the realization center and node between two-way communication;
Characteristics 2. adopt the basic transformat of periodically short frame as the webmaster Business Stream, and a short frame is 16 bytes, and 16 short frames constitute 1 node cycle, and 32 node cycles constitute a loop cycle; Short frame type is divided into and obtains the short frame of network configuration, the short frame of Control Node, the short frame of short frame of system broadcasts and self-defined expense;
3. 1 loop cycle of characteristics are 1048ms, can realize the scanning of whole loop topology, 31 of topology design maximum nodes through a loop cycle;
Characteristics 4. designs are switched with protection, and ring is judged as main ring protection mechanism certainly, can make dicyclo be implemented in the switching between ring and the chain, and switching time is less than 64ms;
Characteristics 5. centers and each node be all by concurrent debit's formula deal with data of selecting, and the short frame overhead of upstream and downstream bandwidth passage and webmaster can supply to design concrete data traffic transmission mode, as based on the time slot segmentation or based on bandwidth sharing.

Claims (2)

1. converse two-way 2M ring is received in a concurrent choosing; It is characterized in that: in the networking of 2M ring; Centroid links to each other through the 2M passage with each base-station node, and the outside of all 2M passages and inboard constitute a logical channel respectively, and the outside is converse each other on direction with inboard logical channel; Outside logical channel and inboard logical channel all are that unit is divided into three parts with the time slot; Comprise webmaster, descending and up; Outside logical channel and arbitrary logical channel in the inboard logical channel all can realize the transmission of the two-way non-consistent route between Centroid and base-station node, and outside logical channel and inboard logical channel are worked simultaneously and just can be realized that concurrent choosing receives converse two-way 2M and encircle;
Described outside logical channel and inboard logical channel are all with the time slot segmentation with the 2M passage of standard G.704: the 31st time slot is fixed for webmaster; It is up that the 1st～N time slot is defined as, promptly from the direction of each base-station node to Centroid; N～30 time slots are defined as descending, promptly from Centroid to the base-station node direction, wherein N is a timeslot number, 1≤N≤30.
2. converse two-way 2M ring method for designing is received in a concurrent choosing, and it is characterized in that: this method comprises webmaster design mechanism, ring protection mechanism and data choice mechanism;
Described webmaster design mechanism is specifically:
31st time slot of Centroid on the 2M loop is that unit sets up self-defined short frame with 16 bytes, and every 16 continuous short frames are a node cycle T 1, every 32 continuous node cycles are a loop cycle T 2, by time of a byte transmission be i.e. 125 μ s, then node cycle T of a 2M frame period 1=16 * 125 μ s * 16=32ms, a loop cycle T 2=32 * T 1=1024ms, the sequence number in the node cycle that it comprises is 0～31, the short frame number in each node cycle is 0～15;
Sequence number is that No. 0 short frame in node cycle of 0～30 is that network configuration is obtained frame, is used to obtain the node ID and the state of network configuration; No. 8 short frame is used for node control, comprises the id information and the control information of Be Controlled node; The 1st～No. 7 short frame and the 9th～No. 15 short frame are used for the self-defined expense of loop node;
Sequence number is that No. 0 short frame and No. 8 short frame in node cycle of 31 is used for system broadcasts, realizes the control of whole loop consistency operation; The 1st～No. 7 short frame and the 9th～No. 15 short frame are used for the self-defined expense of loop node;
Each base-station node reaches with the center through the 2M passage and links to each other to each other; Connect on having the 2M port with under connect the 2M port; The mode of node processing data is that clock continues biography and the add drop multiplex mode along the road; Send from other 2M port if this node of data that promptly receives does not use, promptly data flow direction be last connect 2M receiving terminal RX under connect 2M transmitting terminal TX, connect 2M receiving terminal RX to the last 2M of company transmitting terminal TX down; After node receives network management data, successively at loop cycle T 2The 0th～No. 30 node cycle in extract network configuration and obtain frame; If network configuration is obtained ID and state information that frame has carried this node; Then this node obtains frame to this network configuration and is left intact, and does not carry any information if network configuration is obtained frame, then the ID of this node and state information is obtained frame in network configuration and uploads; And be provided with and uploaded sign, guarantee at T 2Do not repeat to upload the ID and the state information of this node before the end cycle; According to said method, loop cycle T 2The 2M logical channel that finishes the back either side can both get access to the whole network structural information, and sends back the center by converse ring respectively;
Described ring protection mechanism is realized by following steps:
Step 1. node port produces the reception Synchronize Alarm or 2M encircles alarm signal certainly;
Step 2. with the transmitting terminal TX and the receiving terminal RX short circuit of this node, promptly realizes loopback in fpga chip inside in inside, make the data-signal that is delivered to this node port from the center reverse end for end herein to center pathway by;
Step 3. the tune to center pathway by direction on, in webmaster node cycle T 1The 1st～No. 7 and the 9th～No. 15 short frame in place the protection changeover signal; The protection changeover signal is that through any one node cycle the 1st～No. 7 transmitted with the 9th～No. 15 short frame, confirms that in 64ms completion protects switch function;
Step 4. tune to center pathway by direction on, network management information is transferred to adjacent node, parses the protection changeover signal from the 1st～No. 7 of the node cycle and the 9th～No. 15 short frame, adjacent node is transferred to next node with the signal that receives;
Step 5. repeating step 4, to the last node with transfer of data till the center;
Described data choice mechanism is specifically: can realize the converse two-way ring protection function 2M ring that has by webmaster design mechanism and ring protection mechanism; Network topology structure with dicyclo, monocycle, two strands or single stranded form; The center still is that node all has two data sources selective, and the transmission means in design data source;
Described data source selects to comprise that centre data is selected and node data is selected, and centre data selects to adopt following selection strategy:
Select 1. dicyclo direction ID quantity identical and comprise mutually, then be judged as the dicyclo topology, this moment, outer loop data was got at the center;
Select the many rings of 2. dicyclo direction ID quantity differences and ID quantity to comprise the few ring of ID quantity, then be judged as the monocycle topology, this moment, the direction of the many rings of ID quantity was got at the center;
Select 3. dicyclo direction ID quantity no matter whether identical,, then be judged as the chain topology as long as do not comprise mutually; If a certain direction ID quantity is 0, then be the strand topology; The ID quantity of dicyclo direction is double-stranded topology greater than 0 all, selects this moment all to fetch data from twocouese;
Node data is selected specifically: fetch data from a direction forever, but send data from both direction.
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