JP3120843B2 - SDH multiplexer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an SDH multiplexer, and more particularly to an SDH multiplexer that can easily and efficiently realize a management control system for collecting fault information of a remote terminal device in an access network. .

[0002]

2. Description of the Related Art Although an SDH multiplexer has been introduced in an access network, a centralized control system in a central office (CO) is indispensable in the access network.

In a conventional SDH multiplexing apparatus applied to a backbone network, each terminal device (network equipm
In most cases, the location where the ent: “NE” is installed is in a station building, and it is considered that fault monitoring can be performed locally. Remote monitoring of a failure is performed by periodically collecting failure information from a network management system. For this reason, the conventional SD
The H multiplexing apparatus has, as information collection means for remote-side faults, means for notifying only fault information of an adjacent NE, and means for periodically requesting fault information from all management NEs from the management control terminal. Was configured as follows.

[0004]

As described above, the conventional S
In the fault monitoring from the remote terminal device in the DH multiplexing device, a method of periodically collecting fault information from the network management system is adopted. In such a method, the management control terminal always transmits the management control channel. , The communication capacity cannot be used effectively, which hinders effective use of the traffic on the management control channel, and also impairs the communication performance on the NE side.

In the conventional SDH multiplexing apparatus, information collection of remote-side failures can only collect failure information of adjacent NEs, and failure information of remote-side NEs at an arbitrary location on a network is collected. There was a problem that you can not.

(Purpose) It is an object of the present invention to provide a simple and efficient SDH multiplexing system that can centrally and centrally manage and control a system when introducing an SDH multiplexing apparatus into an access network. To provide a chemical conversion device.

Another object of the present invention is to provide an SDH multiplexer capable of collecting fault information of a remote terminal device at an arbitrary place on a network.

Another object of the present invention is to provide an SDH multiplexer capable of effectively utilizing the traffic of the management control channel, effectively utilizing the communication capacity, and not reducing the communication performance of the remote terminal device. Is to do.

[0009]

The SDH multiplexer of the present invention comprises a central office terminal and a plurality of remote terminals.
Network where the terminal device is connected in a ring
Multiplex used as each of the terminal devices in the network
A receiving section termination unit for extracting a management control channel of a received signal from overhead of a section layer, and a receiving line for extracting remote fault information expressed numerically from an overhead byte of a line layer of the management control channel. A termination unit, and the extracted remote fault information is used as a remote value with the initial value of the remote fault information.
Monitored based on the number of connection terminals of the up side, and remote fault monitoring unit to determine the fault location, one of the initial value of the remote fault information or remote fault information obtained by adding or subtracting a predetermined value in the extracted remote fault information A fault information generating unit that outputs a fault information, a fault monitoring unit that monitors the fault on the receiving side, and controls the fault information generating unit to output the initial value of the remote fault information when a fault is detected; A management control unit that controls the generation unit to output either the initial value of the remote fault information as the central office side terminal device or the remote fault information after addition or subtraction as the remote side terminal device, and the fault information generation unit. The transmission-side line termination unit that inserts the generated remote fault information into the transmission signal line layer overhead byte and outputs it, and the management control channel And a transmission-side section termination unit for inserting into layer overhead.

More specifically, a receiving-side section terminator (111) for extracting a management control channel with a remote-side terminal device from section-layer overhead, and remote fault information using a line-layer overhead byte in a preceding stage. A receiving-side line termination unit (112) that receives and extracts from the terminal device, a remote failure monitoring unit (116) that monitors the value of the extracted remote failure information, and adds “1” to the value of the received remote failure information. Adder (1
13) and the terminal section at the central office side and the terminal section at the remote side and the receiving side section terminator (111)
Alternatively, when a failure is detected in the receiving-side line termination unit (112), the remote failure information to be transmitted is set to the initial value “0”.
Reset unit (114), and a transmission-side line termination unit (122) that inserts remote failure information into the overhead byte of the line layer in order to transmit the remote failure information generated in the own terminal device to the next terminal device. And the logical sum of the fault state detected by the receiving section termination unit (111) or the reception line termination unit (112), and the reset unit (114) and the management control terminal interface (1).
17), a receiver failure monitoring unit (115) for transmitting the information to the remote failure monitoring unit (116) and information on whether a failure has been detected in the remote terminal device, and which remote terminal device has detected the failure. A management control terminal interface (117) for receiving information on whether or not there is a management control terminal (102), and a transmission section termination unit (121) for inserting a management control channel with a remote terminal device into the overhead of the section layer. ), And a management control terminal (102) that communicates with the remote terminal device that has detected a failure using the management control channel according to the information notified from the management control terminal interface (117).
And

Further, said plurality of SDH multiplexer connected in a ring shape, one of the SDH multiplexer and a central office terminal device, ring network other SDH multiplexer as a remote terminal device Ru is configured.

(Operation) The central office terminal device inserts a management control channel in which an initial value of a numerical value is inserted into the overhead byte of the line layer of the transmission signal as remote fault information into the overhead of the section layer and transmits it.

The remote terminal extracts a management control channel of the received signal from the overhead of the section layer, extracts the remote fault information from an overhead byte of a line layer of the management control channel, and extracts the remote fault information of the extracted remote fault information. For example, by adding “1” to the value, the remote fault information is set as the own station numerical value, or when a fault is detected on the receiving side of the terminal device, the own station numerical value is set as the initial value and inserted into the overhead. To the next terminal device.

The central office terminal extracts the management control channel of the received signal received from the last terminal from the overhead of the section layer, and extracts the remote fault information from the overhead byte of the line layer of the management control channel. Based on the number of connected terminal devices and the final remote fault information, it can be determined at which location a fault has occurred.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (Structure of Embodiment) FIG. 1 is a diagram showing an embodiment of an SDH multiplexer according to the present invention. The SDH multiplexer shown in FIG.
O-side NE ") or a remote terminal device (" remote-side NE ").

The basic configuration of the SDH multiplexing apparatus 101 shown in FIG. 1 uses a receiving-side section terminating section 111 for extracting a management control channel with a remote-side terminal apparatus from section-layer overhead and a line-layer overhead byte. A receiving-side line terminating unit 112 that receives and extracts remote fault information from a terminal device (NE) at a preceding stage.
And a remote fault monitoring unit 116 that monitors the value of the extracted remote fault information, an adding unit 113 that adds “1” to the value of the received remote fault information, Receiving section end 1
11 or when a failure is detected by the receiving-side line terminating unit 112, the reset unit 114 sets the remote failure information to be transmitted to "0", and sends the remote failure information generated in its own NE to the next NE. For this purpose, the transmission line termination unit 122 for inserting remote failure information into the overhead byte of the line layer and the failure state detected by the reception section termination unit 111 or the reception line termination unit 112 are ORed together, and the reset unit 114 Failure monitoring unit 115 for transmitting the information to the management control terminal interface 117
And information on whether or not a fault has been detected on the remote NE from the remote fault monitoring unit 116, and on which remote NE
Management control terminal interface 117, which receives information on whether a failure has been detected and notifies management control terminal 102 of the failure.
According to the information notified from the management control terminal interface 117, the management control terminal 102 that communicates using the management control channel to the remote NE that has detected the failure, and the management control channel with the remote NE. A transmission-side section terminating unit 121 to be inserted into the overhead of the layer.

FIG. 2 is a diagram showing an embodiment of the present invention in which a ring network is formed using the SDH multiplexer. CO side NE101 and remote side NE # 1
The SDH multiplexer described above is used in 201 to # 5 601 to constitute a one-way ring network composed of clockwise transmission lines. Here, whether the SDH multiplexer functions as a central office terminal (CO-side NE) or a remote terminal (remote-side NE) is determined by a management control terminal connected to the SDH multiplexer. Determined by settings.

(Operation of the Embodiment) Next, the ring network shown in FIG.
The operation of the DH multiplexing device will be described.

In FIG. 1 and FIG. 2, NE 101 and NE # 1 201 to NE # 5 601 respectively assign their own devices to the central office terminal device and the remote terminal device in accordance with the settings of the management control terminal 102 connected thereto. Recognize. Central office NE 101 ("CO NE 101")
Sets the remote fault information to be transmitted to “0”, inserts this into the overhead of the line layer, and transmits the information to the remote side NE # 1 201 at the next stage. Remote NE # 1
201 indicates that no failure has been detected in the reception-side section termination unit 111 and the reception-side line termination unit 112, so that the addition unit 113 adds “1” to the remote failure information and inserts it into the overhead of the line layer. To the remote side NE # 2 301 of the stage. Hereinafter, from the remote NE # 2301 to the remote NE # 5 601,
Similarly, the operation is performed so that the remote fault information is sequentially increased and transferred, and the CO NE 101 receives “5” as the remote fault information.

The remote fault monitoring unit 116 of the CO NE 101 compares the setting of the management control terminal 102 with the value of the received remote fault information to determine whether there is a remote fault. In the case of FIG. 2, the value “5” is preset as the remote fault information in the remote fault monitoring unit 116 of the CO NE 101, and the received remote fault information is “5”. It is determined that the information does not exist, and this information is transmitted to the management control terminal interface 117.
To the management control terminal 102 via

Next, the operation when a failure is detected in the remote NE will be described.

FIG. 3 is a diagram showing a case where a failure occurs between the remote NE # 3 401 and the remote NE # 4 501. The remote-side NE # 4 501 is connected to the remote-side NE # 34
It is assumed that a transmission line failure between the transmission line 01 and the transmission line 01 is detected. In FIG. 3, the remote fault information is stored in the remote NE.
The operation from # 3 401 to transmission as "3" is the same as in the case where there is no obstacle on the remote side.

In the remote NE # 4 501, the fault information detected by the receiving section terminating unit 111 is transmitted to the receiving fault monitoring unit 115, and the receiving fault monitoring unit 115 transmits the fault information to the management control terminal interface. 1
17 and the reset unit 114. In the management control terminal interface 117, the management control terminal 102 in the same station
This information is retained until a fault information inquiry is received from the management control terminal 102 in another station via the management control channel. The reset unit detects the fault on the receiving side, sets the remote fault information to be transmitted to “0”, inserts this into the overhead of the line layer, and transmits it to the remote side NE # 5 601 at the next stage. I do.

As a result, the CO NE 101 receives "1" as the remote fault information. CO side NE 10
Since the remote fault monitoring unit 116 receives the value "1" equal to or smaller than the remote fault information value "5" expected at the normal time, the remote fault monitoring unit 116 determines that there is a fault on the remote side. A notification is sent to the management control terminal 102 via the interface 117. Further, since the remote fault monitoring unit 116 of the CO NE 101 has received the value “1” of the remote fault information, the remote NE # 4 located two remote stages ahead.
It is determined that a failure has been detected in step (1), and this is notified to the management control terminal 102 via the management control terminal interface 117.

The management control terminal 102 connected to the CO NE 101 sends the management control terminal 102 to the remote NE # 4 501 based on the information notified from the CO NE 101 by using the overhead of the section layer between the NEs. Request detailed fault information via the channel.

(Other Embodiment) FIG. 4 is a diagram showing another embodiment of the present invention. This embodiment is an example applied to a bidirectional ring network. Clockwise (C
The operations of W) and counterclockwise (CCW) are the same as in the previous embodiment.

The CO NE 101 of FIG. 4 receives “1” as remote fault information in the CW direction and “2” as remote fault information in the CCW direction. CO side NE
Based on these two pieces of remote failure information, the remote server 101 receives information about the remote NE # 3 401 and the remote NE # 4 50.
1, it is possible to specify that a failure has occurred.

In the above embodiment, the initial value of the remote fault information of the SDH multiplexer as the central office terminal is set to "0", and the calculation of the remote fault information in the subsequent remote SDH multiplexer is Although the example of performing the addition of “1” has been described, it is apparent that the initial value and the operation can be appropriately selected. For example, it is needless to say that the operation can be performed by an arithmetic operation of an arbitrary constant value.

[0029]

According to the SDH multiplexer of the present invention, by using simple numerical information as the remote fault information, the fault information of the remote NE at an arbitrary place on the network can be transmitted to the central office terminal (NE). It is possible to know. Also, based on this information, only when a failure is detected on the remote side, the management control terminal requests the detailed information from the corresponding remote side terminal (NE), thereby increasing the communication capacity of the management control channel. Terminal device (NE)
The communication performance will not be squeezed.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of an SDH multiplexer of the present invention.

FIG. 2 is a diagram showing an embodiment of the present invention in which an SDH multiplexer is applied to a ring network.

FIG. 3 is a diagram for explaining an operation of the present embodiment applied to a ring network.

FIG. 4 is a diagram illustrating an operation when a failure occurs according to the present embodiment applied to a ring network;

[Explanation of symbols]

 Reference Signs List 101 SDH multiplexer 102 Management and control terminal 111 Receiving-side section termination unit 112 Receiving-side line termination unit 113 Addition unit 114 Reset unit 115 Receiving-side failure monitoring unit 116 Remote failure monitoring unit 117 Management and control terminal interface 121 Transmission-side section termination unit 122 Transmission-side line termination unit 201 Remote-side NE # 1 301 Remote-side NE # 2 401 Remote-side NE # 3 501 Remote-side NE # 4 601 Remote-side NE # 5

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-14383 (JP, A) JP-A-2-193433 (JP, A) JP-A-3-19439 (JP, A) JP-A-9-99 321729 (JP, A) JP-A-3-145239 (JP, A) JP-A-3-163930 (JP, A) JP-A 8-307438 (JP, A) JP-A-6-37778 (JP, A) (58) Field surveyed (Int.Cl. ⁷ , DB name) H04J 3/00-3/26 H04L ^7/ 00-7/10

Claims (7)

(57) [Claims] (1)Central office terminal and multiple remote terminals
To a ring network where devices are connected in a ring
Multiplexing device used as each of the above terminal devices
And  Remote expressed numerically from the overhead byte of the received signal
A receiver for extracting the fault information, and
The remote fault informationFirst of the remote fault information
Expiration value and remote sideMonitor based on the number of connected terminalsAnd obstacles
Judge the placeA remote fault monitoring unit that performs
Remote fault information or remote
Of fault informationSaidFailure information that outputs one of the initial values
A generation unit for monitoring a failure on the receiving side and detecting the failure when a failure is detected;
The fault information so as to output the initial value of the fault information.
A failure monitoring unit for controlling a report generation unit, and the failure information
Generates the first remote fault information as
The remote value after the calculation as the
Control system to output any of the fault information
Control unit and the remote fault information generated by the fault information generating unit.
Information is inserted into the overhead byte of the transmission signal and output.
Multiplexing apparatus, comprising:
Place. 2. A receiving section terminating section for extracting a management control channel of a received signal from overhead of a section layer, and a receiving section for extracting the remote fault information from an overhead byte of a line layer of a management control channel. A transmission-side line termination unit that has a line termination unit, and the transmission unit inserts and outputs the remote failure information generated by the failure information generation unit into an overhead byte of a line layer of a management control channel of a transmission signal, and
2. The SDH multiplexer according to claim 1, further comprising: a transmission-side section terminating unit that inserts the management control channel into a section layer overhead. 3. The SDH multiplexer according to claim 1, wherein the operation is an addition operation or a subtraction operation of a constant value to the extracted remote fault information. 4. The receiving-side fault monitoring unit detects a fault on the receiving side based on outputs from the receiving-side section terminating unit and the receiving-side line terminating unit. The SDH multiplexer according to claim 2 or 3, wherein the fault information generator is controlled to output a value. 5. The fault information generating unit includes a calculating unit that adds or subtracts a predetermined numerical value to or from a value of remote fault information, and a reset unit that resets its output to an initial value. As a terminal device by the management control unit
Receiver SDH multiplexer as claimed in claim 1, 2, 3 or 4, wherein the resetting by the receiver failure monitoring unit when a failure or as a remote terminal unit to reset. 6. The management control unit has a management control terminal interface connected to a management control terminal that communicates with the remote terminal device that has detected a failure by using the management control channel. Claim 1,
5. The SDH multiplexer according to 2, 3, or 4. 7. A plurality of SDH multiplexers according to claim 1, 2 or 3, connected in a ring, and any one of the SDH multiplexers is connected.
A ring network in which the H multiplexing device is configured as a central office terminal device and the other SDH multiplexing devices are configured as remote terminal devices.
Work .