JP3267190B2 - Line protection method in ring network system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to SONET and S
The present invention relates to a line protection method in a ring network system having an ADM transmission device using a DH transmission communication method.

[0002]

2. Description of the Related Art In today's information society, network environment maintenance is an important issue. For this reason, various network topologies have been devised. Among them, a ring network system is useful and widely used.

A conventional ring network system is
ADM (Add Drop Multi-plex)
r) It is configured by connecting a plurality of transmission devices called transmission devices (hereinafter, also simply referred to as ADM).

For example, as a conventional network, "SO
NET Bi-directional Line-SwitchedRing Equipment Gen
eric Criteria, Bellcore, GENERIC REQUIREMENT GR-12
The structure is described in “30”.

On the other hand, in order to maintain a network environment (line protection), in the ADM of the above-described ring network system, transmission is performed using two interfaces, a working (Work) and a protection (Protection).

Here, an example of the above-mentioned conventional ring network system is shown in FIG. The ring network system shown in FIG.
Four ADMs consisting of 55 and 157 and each A
Aggregate interface 11 for connecting DM
9 to 149, and tributary interfaces 111, 113, 115 and 117 for connecting the ring network system shown in FIG.

Next, FIG. 5 shows the ADM 15 shown in FIG.
5 shows a block diagram of the structure of FIG. Here, the structures of the other ADMs 151, 153 and 157 shown in FIG. 4 are the same as the structure shown in FIG.

As shown in FIG. 5, the ADM 155
An aggregate interface (West Protection) 135 and an aggregate interface (West Work), which are two interfaces for connecting the ADM 155 to the west ADM.
137, an aggregate interface unit 161 and an aggregate interface unit 163 for connecting the aggregate interfaces 135 and 137 to the switch unit 168, and an ADM on the east side with respect to the ADM 155.
Aggregate interface (East Protection), which is an interface to connect to
139 and the aggregate interface (East W
ork) 141 and the aggregate interface 1
An aggregate interface unit 165 and an aggregate interface unit 167 for connecting the switch units 168 and 39 and the switch unit 168 to an external network or AD.
M, etc., a tributary interface 115 which is an interface for connecting to the M and the like, a tributary interface section 169 and a tributary interface section 171 for connecting the tributary interface 115 and the switch section 168, and each aggregate interface section and And a switch unit 168 for switching the connection of each tributary interface unit.

[0009] Aggregate interface units 161-1
The configuration of 67 will be described in more detail. Each of the aggregate interface units 161 to 167 is an ADM.
Aggregate interfaces 135 to 141 as external interfaces of the transmission device 155 are connected, and the aggregate interface units 161 to 167 themselves are internal interfaces as interfaces with the switch unit 168.

The tributary interface unit 16
The configurations 9 and 171 will be described in more detail. The tributary interface units 169 and 171 are respectively connected to the tributary interface 115 as an external interface of the ADM transmission device 155, and the tributary interface units 169 and 171 themselves are internal interfaces as an interface with the switch unit 168. ing.

Each of the above-described aggregate interface units 161 to 167 and tributary interface units 169 to 171 as interfaces in the apparatus is configured by multiplexing a plurality of channels.

As described above, the conventional ADM transmission apparatus 1
55, two tributary interface units 169 and 171 and four aggregate interface units 16
1 to 167 and a switch unit 168, and the channel of the aggregate interface can be connected to the channel of the aggregate interface or the channel of the tributary interface under the control of the switch unit 168.

Further, as described above, the conventional ADM transmission device 155 is provided with aggregate interfaces 135 to 14.
1 and a tributary interface 115.

The external interface is SONET.
(Synchronous Optical NETw
ork) / SDH (Synchronous Digi)
tal Hierarchy) is applied.

Further, the aggregate interface is:
In two directions (here, West and East), and for each direction, maintenance (Work) and protection (Protection) for each direction for network maintenance and failure avoidance.
n) and is classified into a total of four types of interfaces. In other words, West Work, West Protect
ion, East Work, East Protect
Tion interface.

Next, FIG. 6 shows a state in which a ring network system provided with the above-mentioned conventional ADM is connected to another ring network system. In FIG. 6, (a) of FIG. 6 shows four ADMs 181, 183, 1
Fig. 8 shows a single ring network system having 85 and 187; However, the interface is omitted for simplicity.

FIG. 6B shows a state where the two ring network systems shown in FIG. 6A are connected. In this figure, 189 to 203 are the above-mentioned ADMs, and the interfaces of these ADMs are also
It is omitted for simplicity.

As shown in FIG. 6A, the configuration of the ring network system is such that an ADM transmission device existing in one station in one ring network is composed of:
It is connected to another two ADM transmission devices on one ring network via an aggregate interface. In order to identify the other two units, the ADM transmission device of the west station (West station) and the ADM station of the east station (East station) are relatively named with respect to the own station on one ring network.
ADM transmission device.

Therefore, from the viewpoint of the ADM transmission device of the West station, the ADM transmission device of the own station corresponds to the East station.

As is clear from FIG. 6, the connection of the ADM transmission device in the conventional ring network composed of a plurality of ADM transmission devices is performed by the West Work interface of the own ADM transmission device and the ADM transmission of the West station. Connected to the EastWork interface of the device, and the West Pro
The protection interface is the AD of the West station.
Connected to the East Protection interface of the M transmission apparatus, and connected to the East protection interface of the own ADM transmission apparatus.
The Work interface is connected to the West Work interface of the ADM transmission device of the East station, and the WestProtect of the ADM transmission device of the own station is connected.
The on interface is connected to the East Protection interface of the ADM transmission device of the West station.

Therefore, the connection relationship between a plurality of ADM transmission devices constituting the ring network system is as follows:
All the above connection relationships are established.

Further, as shown in FIG.
One ring network is, for example, an ADM transmission device 19
3 and 197 are connected by two ADM transmission devices.

[0023]

However, in a line protection system in a conventional ring network system, when two ring networks are connected, for example, as shown in FIG.
The connection must be made using two ADM transmission devices, the M transmission devices 193 and 197.

As described above, in the line protection system in the conventional ring network system, the work (Work) and the backup (Pro) are required for maintenance.
Since the transmission is performed using two interfaces with the ADM, the redundancy is inevitable when a ring network is connected using two ADM transmission devices.

Further, since two ring networks are connected by two ADM devices, there is a problem that the degree of freedom of the network configuration is low.

The present invention has been made in view of the above circumstances, and provides a line protection system in a ring network system capable of eliminating redundancy and improving connection expandability in connection of the ring network system. With the goal.

[0027]

According to the first aspect of the present invention,
In a line protection system in a ring network system provided with an ADM transmission device, the ADM transmission device has four sets of interface units each including a working aggregate interface unit and a spare aggregate interface unit, and four sets of interface units. Are paired, and a grid-type switch unit for interconnecting between the current aggregate interface units and the spare aggregate interface unit forming this set, and a grid-type switch unit and an external network are connected. And one set of interface units is connected to a predetermined ring network, and the other set of interface units is connected to a ring network other than the predetermined ring network. Interface There has been characterized by being configured by connecting different ring networks respectively.

Therefore, according to the present invention, since the switch unit for switching the connection is a lattice type switch unit, each of the plurality of interface units comprising the working aggregate interface unit and the spare aggregate interface unit is provided. Can be easily executed, so that the redundancy of the line protection method in the ring network system when two ring networks are connected can be reduced. Furthermore, it is possible to connect to different external networks via the tributary interface, thereby improving the degree of freedom of the network configuration.

According to a second aspect of the present invention, in the first aspect of the present invention, the switch unit includes a storage unit for storing at least one or more cross-connect maps for failure recovery, and a plurality of switches based on a predetermined instruction. One of a working aggregate interface unit and a spare aggregate interface unit included in one of the interface units, and a working aggregate interface unit included in an interface unit other than the one interface unit; Aggregate interface connecting means for connecting to one of the spare aggregate interface units, a working aggregate interface unit and a spare aggregate included in one of the plurality of interface units based on a predetermined instruction. Gate interface section And either the tributary interface connection means for connecting the tributary interface unit, may have a superimposing means for superimposing one or more cross-connect map disorders for recovery.

Therefore, according to the present invention, the operation of the invention described in claim 1 can be obtained, and the switch unit stores one or more cross-connect maps for failure recovery, and the connection between each interface unit. And at least one failure recovery cross-connect map is superimposed to form a new cross-connect map, thereby increasing the degree of freedom in the configuration of the ring network system, thereby effectively providing line protection in the ring network system. It can be performed.

[0031]

Next, an embodiment of a line protection system in a ring network system according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing one embodiment of a line protection scheme in a ring network system according to the present invention.

As shown in FIG. 1, in the present embodiment, a ring network including ADM1, ADM3 and ADM5, and ADM7, ADM9 and ADM1
The two ring networks with the ring network provided with 1 are connected by one ADM 13.

The structure of the ADM1, ADM3, ADM5, ADM7, ADM9 and ADM11 other than the ADM13 shown in FIG. 1 is the same as the structure of the ADM shown in FIG. Is omitted.

Next, the structure of the ADM 13 shown in FIG. 1 will be described with reference to FIG. FIG. 2 shows a block diagram of the structure of the ADM 13 shown in FIG.

As shown in FIG. 2, this ADM 1
3 is an aggregate interface (West Pr)
aggregation) and the switch unit 61, an aggregate interface unit 43 for connecting the aggregate interface (West Work) 23 and the switch unit 61, and an aggregate interface (West) An aggregation interface unit 45 for connecting the protection unit 25 and the switch unit 61, and an aggregate interface (West)
(Work) 27 and an aggregate interface unit 47 for connecting the switch unit 61.

Further, an aggregate interface unit 49 for connecting the aggregate interface (East Protection) 29 and the switch unit 61, and an aggregate interface (East Protection)
And an aggregate interface (East Protection) 3 for connecting the Work 31 and the switch unit 61 to each other.
An aggregate interface unit 53 for connecting the switch unit 3 to the switch unit 61 and an aggregate interface unit 55 for connecting the aggregate interface (East Work) 35 and the switch unit 61 are provided.

Further, a tributary interface section 57 and a tributary interface section 59 for connecting the external tributary interface 37 and the switch section 61 are provided.

The switch unit 61 has a control unit (not shown) for controlling the connection between each aggregate interface unit and the tributary interface unit. It has a memory for storing the map and a calculation unit for superimposing the stored cross-connect map.

Therefore, by making connection using only one ADM 13 shown in FIG. 2, in the line protection system in the ring network system,
Redundancy when two ring networks having a connection relationship as shown in FIG. 1 are connected can be reduced, and the switch unit 61 controls the connection between each aggregate interface unit and the tributary interface unit. By doing so, the degree of freedom of the network configuration can be improved.

Next, the operation of the ADM 13 will be described in more detail with reference to FIG. FIG. 3 is a conceptual diagram showing the operation of the ADM 13 shown in FIG. However, the functions newly added to the ADM 13 in the present invention are denoted by “a” after the reference numerals.

First, the line attribute information set by the user and the cross-connect map set by the user are sent to the switch unit 61 (71a, 73). The switch unit 61
A cross connect map separation process (75a) is performed.

Next, a cross connect map as a RING ADM is created (77a), and a cross connect map for ring protection is created (79). Then, from among the cross connect maps for ring protection (81), a cross connect map for ring protection is selected (83), and a cross cort map to be set is set (85). Further, one or more processes 101 similar to this process are executed (91a to 99a).

Thereafter, the cross connect map is superimposed by the cross connect map superimposing function of the switch section 61 (87a), and a current cross connect map is created (89).

Therefore, by providing the above functions in the switch unit 61, it is possible to improve the expandability of the connection in the ADM 13 provided by the line protection system in the ring network system, and further improve the flexibility of the network configuration.

[0045]

As is apparent from the above description, according to the present invention, since the switch unit for switching the connection of each interface unit is a lattice switch unit, the current aggregate interface unit and the spare aggregate interface unit are connected. The connection with the aggregate interface unit can be executed by one ADM transmission device, and a ring network having an ADM transmission device using two interfaces, a working interface and a protection interface, is connected for protection of the ring network system. In such a case, the redundancy can be reduced, and the circuit scale can be reduced, so that a line protection scheme in a ring network system can be provided.

Further, since the switch section has a tributary interface, it is easy to connect via a tributary interface such as an aggregate interface and a tributary interface, and an external network to a tributary interface. This makes it possible to provide a line protection method in a ring network system capable of improving connection expandability.

The connection of each interface unit is switched by one or more fault recovery cross-connect maps stored in the switch unit, and the one or more fault recovery cross-connect maps are superimposed to form a new cross-connect map. Is created, so that the degree of freedom in the network configuration is improved and the scalability of the connection can be improved,
It is possible to provide a line protection method in a ring network system that can effectively perform line protection in the ring network system.

Further, two of the four interface units of the switch unit are connected to one ring network, and the other two interface units are connected to another ring network. A line protection method in a ring network system capable of reducing redundancy when two ring networks are connected can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing the structure of an embodiment of a line protection scheme in a ring network system according to the present invention.

FIG. 2 is a block diagram showing a structure of an embodiment of an ADM transmission device provided by a line protection method in a ring network system according to the present invention.

FIG. 3 is a conceptual diagram of an operation of a line protection method in a ring network system according to the present invention.

FIG. 4 is a schematic diagram showing the structure of a conventional ring network system.

FIG. 5 shows A of a conventional ring network system.
FIG. 2 is a block diagram illustrating a structure of a DM transmission device.

FIG. 6 is a schematic diagram showing a state where a conventional ring network system connects.

[Explanation of symbols]

 1 to 13 ADM transmission device 21 to 35 Aggregate interface 37 Tributary interface 41 to 55 Aggregate interface 57, 59 Tributary interface 61 Switch

Claims (2)

(57) [Claims] 1. A line protection system in a ring network system having an ADM transmission device, wherein the ADM transmission device has four sets of interface units each including a working aggregate interface unit and a spare aggregate interface unit. , The four sets of interface units are made into two pairs, and the sets are formed.
Between the working aggregate interface sections to be formed and
Connect the spare aggregate interface units to each other
For connecting the grid type switch unit and the external network
And a tributary interface section for connecting the one set of interface sections to a predetermined ring network.
Connected to the workpiece and the other set of interface units
A ring network other than the predetermined ring network;
And the interface units configured in the pair are different from each other.
A line protection system in a ring network system, wherein the line protection system is configured to be connected to a ring network. 2. The switch unit according to claim 1, further comprising: storage means for storing at least one or more cross-connect maps for recovery from a failure, and a working unit included in one of the plurality of interface units based on a predetermined instruction. Connection between one of the aggregate interface unit and the spare aggregate interface unit, and one of the working aggregate interface unit and the spare aggregate interface unit included in the interface unit other than the one interface unit An aggregate interface connecting means for performing the operation , one of a working aggregate interface unit and a spare aggregate interface unit included in one of the plurality of interface units based on a predetermined instruction, and the tributary. Inn A tributary interface connection means for connecting the face portion, line protection scheme in the ring network system according to claim 1, characterized in that it comprises a superimposing means for superimposing the cross-connect map of the one or more failures for recovery .