JP3562718B2 - Selection Recognition Method for Ring Network Through Node - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for recognizing a selection system in a ring network through node, and more particularly, to split a transmission signal at a transmission node, pass a signal received at a passing through node, and select a split signal by a selector of a reception node. The present invention relates to a method of recognizing the selection system of a receiving node at a through node by returning the selection system information of the receiving node to the transmitting node and transmitting the information again from the transmitting node in the UPSR ring network.
[0002]
[Prior art]
In a unidirectional path switched ring (UPSR) ring network shown in FIG. 4, a transmission signal is branched and transmitted by a transmission node 501, but passing through nodes 503 and 504 only pass through a received signal. The selection of the branched signal is determined only by the operation of the selector 521 of the receiving node 502 (Bellcore GR-1400-CORE). Normally, the receiving node and the through node are geographically separated from each other, and the selection of the branched signal is determined only by the receiving node. Conventionally, it has been necessary to transmit selection system information of the receiving node 502 to a through node via a higher-level management network or the like.
[0003]
However, this method has a problem that the load on the management network increases depending on the number of paths to be managed, and the speed of transmitting the selection information from the receiving node to the through node depends on the performance of the management network. is there.
[0004]
Accordingly, the present invention provides a selection system recognition method in a UPSR ring network that does not impose a load on the management network and that the speed of transmitting the selection system information from the receiving node to the through node does not depend on the performance of the management network. .
[0005]
[Means for Solving the Problems]
The present invention for solving the above-mentioned problem is a selection system recognition method for determining whether a path passing through a through node on a UPSR ring network is a selection system or a non-selection system. Inserting a first label identifying a route into a path overhead of a transmission frame, wherein the receiving node on the network selects a transmission route selected by the receiving node during the path overhead of the received transmission frame. Inserting a second label identifying the second label and returning to the transmitting node, wherein the transmitting node on the network inserts the first label into the transmission frame including the second label in the path overhead, and Transmitting, and the through node, if the first and second labels match, And a step of recognizing that the path through the serial-through node is selected based.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of each node used in the selection recognition method in the ring network through node of the present invention. As shown in the figure, the transmitting node 101 includes a unit for inserting label information for identifying a route around WEST 151 / EAST 152. In addition, the receiving node 102 includes means for returning any of the inserted label information to the transmitting node 101 as selection system information.
[0007]
Therefore, the selection system information is transmitted from the transmitting node 101 again. In the through nodes 103 and 104, different label information inserted from the transmitting node 101 is fixedly received, so that the path passing through the through node is selected only by judging the match / mismatch between the label information and the selection information. It can recognize whether it is a system or not.
[0008]
In the present invention, the label insertion unit is arranged in the transmission node 101, the selection information wrapping unit is arranged in the transmission node 101 and the reception node 102, and the selection system recognition unit is arranged in the through nodes 103 and 104.
[0009]
With reference to FIG. 2, information to be inserted in label insertion section 110 will be described.
[0010]
In the label insertion unit 110, in the insertion units 111 and 112, the empty bytes A in the path overhead of each frame (the first half of the byte A in FIG. It has inserters 113 and 114 for inserting label information (301 and 302 in FIG. 2B) for identifying a route. FIGS. 2C and 2D show the states of the insertion signals of insertion sections 111 and 112, respectively.
[0011]
In the selection information return unit 120 on the receiving node 102 side, the byte A in the overhead is separated from the signal received by the separation unit 121, and the label information extracted from the byte A is inserted into the transmission signal by the insertion unit 122. The information is returned to the transmitting node 101 as information.
[0012]
In the selection system information loopback unit 115 on the transmission node 101 side, the separation system 117 extracts the selection system information looped back and inserted in the selection system information loopback unit 120 on the reception node 102 side.
[0013]
This selection system information is inserted into the latter half of the empty byte A in the path overhead used by the label insertion unit 110 by the insertion unit 116, and is transmitted back. FIG. 2E shows the state of the insertion signal of insertion section 116.
[0014]
The selection system recognition units 130 and 140 of the through nodes 103 and 104 separate the label information inserted from the label insertion unit 110 and the selection system information inserted from the selection system information return unit 115 on the transmission node side into separation units 132 and 142. Based on the comparison result between the label information output from the comparison units 131 and 141 and the selection system information, the indicator control units 133 and 143 control an indicator such as a lamp.
[0015]
FIG. 3A shows a case where a signal on the EAST side is selected by the receiving node 102. In this case, a signal as shown in FIG.
[0016]
Since different label information is inserted into each route by the label insertion unit 110, a signal as shown in FIG. 3C is fixedly applied to the through node 103, and a signal as shown in FIG. Receive.
[0017]
Therefore, at the stage when the return processing of the selection information has been completed at the receiving node 102 and the transmitting node 101, the signals received by the through nodes 103 and 104 are as shown in FIGS. 3E and 3F, respectively.
[0018]
In each of the through nodes 103 and 104, the separators 132 and 142 extract the label information (the first half of the byte A) and the selection information (the second half of the byte A), and the comparators 131 and 141 compare the two. If they match, it is possible to recognize that the path passing through the through node is the selected system, and if they do not match, it is the non-selected system.
[0019]
Therefore, if this is linked with the control of an indicator such as a lamp, it becomes possible to inform the maintenance person whether or not the selected path is conducting.
[0020]
That is, in the example of FIG. 3, a path passing through the through node 104 is recognized as a selected system, and a path passing through the through node 103 is recognized as a non-selected system.
[0021]
【The invention's effect】
According to the present invention described above, it becomes possible to recognize information as to whether or not the system is a selection system at a through node, and by controlling an indicator such as a lamp based on this information, the lamp is turned off when not selected. Thus, it is possible to inform the maintenance person that maintenance is possible.
[0022]
Further, according to the present invention, by utilizing the overhead in the transmission signal, there is no need for a transmission path via an upper management network for transmitting the selection system information of the receiving node to the through node as shown in FIG. It is to become.
[Brief description of the drawings]
FIG. 1 is a block diagram of each node used for a selection recognition method in a ring network through node according to the present invention; FIG. 2 is a transmission frame configuration diagram; FIG. 3 is a transmission frame state for explaining the operation of the present invention; FIG. 4 is a conceptual diagram of a conventional UPSR ring network.
101 transmission node 102 reception nodes 103 and 104 through node 110 label insertion unit 115 and 120 selection system information return unit 130 and 140 selection system recognition unit

Claims (4)

A selection type recognition method for determining whether a path passing through a through node on a UPSR ring network is a selection type or a non-selection type,
A transmitting node on the network inserts a first label identifying a transmission route into a path overhead of a transmission frame;
A receiving node on the network, in the path overhead of the received transmission frame, inserts a second label identifying the transmission route selected by the receiving node, and loops back to the transmitting node;
A transmitting node on the network inserts the first label into the transmission frame including the second label in the path overhead and retransmits the transmission frame, and the through node determines that the first and second labels are identical. Recognizing that a path passing through the through node is a selection system. 2. The method according to claim 1, wherein the empty bytes of the path overhead are divided into two, and the first and second labels are inserted. The method according to claim 1, wherein an indicator is controlled based on the recognition result. 2. The selective system recognition method according to claim 1, wherein when the through node recognizes that the through node is the non-select system, the through node is checked and maintained.

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