JP2596347B2 - AIS insertion and release method for drop path in self-repair ring network and each node - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ring connection in which a plurality of nodes are connected to each other, and each node transmits and receives signals to and from two adjacent nodes on both sides thereof. Switch (PPS) and this path
Create a map to determine the protection switch connection
Switch to set as the path protection switch.
Self-rescue ring network that includes a switch control unit and is capable of self-rescue when an abnormality occurs, in particular, insertion and release of an alarm display signal (AIS) to a drop path in each node configuring the self-rescue ring network About the method.

[0002]

2. Description of the Related Art A method of inserting and releasing an AIS into a drop path in each node constituting a conventional self-repair ring network will be described with reference to FIG. The illustrated self-rescue ring network includes first to fourth nodes 201, 202, 203, and 204, and these nodes 201 to 204 are connected in a ring shape. Here, the first to fourth nodes 201 to 204 are respectively referred to as a node A, a node B, a node C, and a node D.
Also called. Each node performs transmission and reception of optical signals between two adjacent nodes on both sides, and the later-described path protection switch (PPS), this
That determines the connection of the path protection switch
And set it as a path protection switch
And a self-relieving ring network when an abnormality occurs.

Since the nodes A to D have the same function, only the configuration of the node A is illustrated here, and the node A will be described. Here, in the first node 201 (node A), the side to which one adjacent node (in this example, the fourth node 204 (node D)) is connected is the HS (high speed) 1 side. , And the side to which the other adjacent node (in this example, the second node 202 (node B)) is connected is referred to as the HS2 side. Here, since the operation in the transmitting unit is not relevant, only the receiving unit is illustrated.

[0004] The first node 201 (node A)
HS1 side AIS detection unit 2 that detects AIS on one side
05 and HS2 side A that detects AIS on HS2 side
IS detection unit 206, time switch unit (TSW unit) 207 for inserting and releasing AIS into and from the drop path, and map (MAP) of AIS insertion and release (not shown)
TSW control unit 20 which creates a TSW and sets it in the TSW unit 207
8 is provided. The TSW unit 207 has the above-described path
Works as a protection switch.

The following is known as prior art related to the present invention. Japanese Patent Application Laid-Open No. 2-151147 (hereinafter referred to as Prior Art 1) discloses a method of detecting a failure in a transmission end interface at a transmission end and a failure in a transmission end switch and a bipolar / unipolar converter interface. Discloses a "line switching system due to a transmission-end failure" in which the reserve occupancy rate is reduced due to a failure in the working line. JP-A-1-218154 (hereinafter, referred to as Prior Art 2) and JP-A-1-218155 (hereinafter, referred to as Prior Art 3) provide a self-diagnosis function for each time switch so that an arbitrary time switch can be provided. A "communication path test method" which enables easy and quick testing of a highway is disclosed. JP-A-64-48597 (hereinafter referred to as prior art 4) discloses that a multiplexed time slot is switched and inserted into an empty time slot by a time switch and returned to a subscriber interface for speed conversion. Discloses a "line switching device" that enables signals having different encoding speeds to be easily extracted as branch signals at a branch interface connected to a time switch.

[0006]

SUMMARY OF THE INVENTION AI to a drop path in the above-described conventional self-repair ring network
In the S insertion / release method, the HS1 side and the HS2 side AIS
The detection units 205 and 206 need to perform AIS detection processing, and the TSW control unit 208 needs to create a MAP that sends the AIS to the TSW unit 207 to the drop path. Therefore, there is a problem that the time for inserting and releasing the AIS into the drop path becomes long.

Therefore, the technical problem of the present invention is to
The object is to greatly reduce the time for inserting and releasing S.

[0008] None of the prior arts 1 to 4 described above describes a method of inserting and releasing an AIS into a drop path in each node.

[0009]

According to the present invention, a plurality of nodes are connected in a ring shape, and each node transmits and receives signals to and from two adjacent nodes on both sides thereof, and each node transmits and receives signals. Path protection switch (PPS)
And the connection of the path protection switch
Create a map for the path protection switch.
Each node detects an alarm indication signal (AIS) transmitted from one of the adjacent nodes in a self-rescue ring network that includes a switch control unit that is set to the first switch and that can self-recover when an abnormality occurs. A first AIS detector and a second AIS detector for detecting an alarm indication signal (AIS) transmitted from the other adjacent node ;
Wherein the path protection switch, the first or the second self-rescue ring network you characterized and Turkey an AIS detected by AIS detector passed to the drop path side is obtained.

Further, according to the present invention, a plurality of nodes are connected in a ring shape, each node transmits and receives a signal to and from two adjacent nodes on both sides thereof, and each node performs path protection. Switch (PPS) and the path
・ Map for determining connection of protection switch
And set it to the path protection switch .
That comprises a switch control unit, the AIS insertion and unlocking method of the drop path upon abnormality occurs in each node of the self-rescue, self rescue ring network,
Each node, when detecting an AIS from the two nodes adjacent to the node, wherein without any processing on the switch control unit, the path AIS from the node on the side which is connected to the time the drop path ・ Protection
The AIS is inserted into the drop path by passing the AIS to the drop path as it is, and the AIS is released when the passed AIS disappears. An insertion and release scheme is obtained.

[0011]

When each node detects an AIS from two adjacent nodes, the detected AIS is transmitted as it is and output to the drop path.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

With reference to FIG. 1, a description will be given of a method of inserting and releasing an AIS into a drop path in each node constituting a self-rescue ring network according to an embodiment of the present invention. The self-help ring network shown is
First to fourth nodes 101, 102, 103 and 1
04, and these nodes 101 to 104 are connected in a ring shape. Here, the first to fourth nodes 10
1 to 104 are also referred to as nodes A, B, C and D, respectively. Each node transmits and receives an optical signal to and from two adjacent nodes on both sides of the node, and a path protection switch (P
PS) and the connection of this path protection switch
Create a map that determines the
A switch control unit for setting the switch to a switch, so that the ring network can be self-relieved when an abnormality occurs.

Since the nodes A to D have the same function, only the configuration of the node A is illustrated here and the node A will be described. Here, in the first node 101 (node A), the side to which one adjacent node (in this example, the fourth node 104 (node D)) is connected is the HS (high speed) 1 side. , And the side to which the other adjacent node (in this example, the second node 102 (node B)) is connected is referred to as the HS2 side. Here, since the operation in the transmitting unit is not relevant, only the receiving unit is illustrated.

The first node 101 (node A)
HS1 side AIS detector 1 that detects AIS on one side
05 and HS2 side A that detects AIS on HS2 side
A time switch unit (TSW) for passing the AIS detected by the IS detection unit 106 and the HS1 AIS detection unit 105 or the HS2 AIS detection unit 106 to the drop path side.
Unit) 107 and a map (MAP) (not shown) for determining the connection of the TSW unit 107 is created.
And a TSW control unit 108 for setting to. TSW
The unit 107 functions as the above-described path protection switch.

Next, the operation of this embodiment will be described with reference to FIG. HS1 side AIS detection unit 105, HS2
When the AIS is detected on both sides of the side AIS detection unit 106, the AIS is inserted into the drop path as follows.
That is, HS1 (node D) side, HS2 (node B)
One of the AISs is passed (transmitted) to the drop path by the TSW unit 107 as it is. This selection depends on which of the HSW (node D) side and the HS2 (node B) side connects the drop path at that time. In the illustrated example, since the TSW unit 107 connects the drop path to the HS1, the AIS from the HS1 side
Is passed to the drop path side. At this time, the TSW control unit 108 does not perform any processing.

When canceling the AIS, the TSW control unit 1
In 08, no processing was performed, and the AI passed (transmitted)
If the S disappears, it is to its extinction at the same time drop path A
IS not sent .

It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various changes / modifications can be made without departing from the spirit of the present invention.

[0019]

As described above, according to the present invention, when an AIS is detected at each node from two adjacent nodes, the detected AIS is transmitted and output to the drop path. There is an effect that the time for insertion and release can be significantly reduced.

[Brief description of the drawings]

FIG. 1 illustrates an example of an AI for a drop path according to an embodiment of the present invention.
FIG. 2 is a block diagram showing a self-repair ring network to which an S insertion and release scheme is applied.

FIG. 2 is a block diagram showing a self-healing ring network to which a conventional AIS insertion / release method for a drop path is applied.

[Description of Signs] 101, 201 Node A 102, 202 Node B 103, 203 Node C 104, 204 Node D 105, 205 HS1-side AIS detection section 106, 206 HS2-side AIS detection section 107, 207 TSW section (path protection・
Switch) 108,208 TSW control unit

Claims (2)

(57) [Claims] 1. A plurality of nodes are connected in a ring shape, each node transmits and receives signals between two adjacent nodes on both sides thereof, and each node includes a path protection switch (PPS) ; The pass protection
Create a map that determines switch connections and create a
In a self-rescue ring network that includes a switch control unit that is set as a protection switch and is capable of self-rescue when an abnormality occurs, each node outputs an alarm indication signal (AIS) transmitted from one adjacent node. A first AIS detecting section for detecting, and a second AIS detecting section for detecting an alarm indication signal (AIS) transmitted from the other adjacent node , wherein the path protection switch is connected to the first or second node. self rescue ring, wherein the benzalkonium passed to the drop path side AIS detected by the second AIS detector
network. 2. A plurality of nodes are connected in a ring shape, each node transmitting and receiving signals between two adjacent nodes on both sides thereof, and each node includes a path protection switch (PPS) ; The pass protection
Create a map that determines switch connections and create a
A switch control unit for setting the protection switch to a protection switch.
In IS insertion and unlocking method, each node, when detecting an AIS from the two nodes adjacent to the node, wherein without any processing on the switch control unit, the side connected with the time the drop path AIS from the node is passed to the path protection
The AIS is inserted into the drop path by passing the AIS to the drop path as it is, and the AIS is released when the passed AIS disappears. Insertion and release method.