JP2000022715A - Atm communication network - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain detour that flexibly complies with a utilizing form of a memory so as to attain detour in the unit of VCs of cell assembling and disassembly destinations in the ATM communication network provided with a CLAD function. SOLUTION: The ATM communication network 17 that relays an ATM exchange 1 provided with a CLAD device 4 and an ATM exchange 8 provided with a CLAD device 11, is provided with two detour information management means 2, 9 that set in advance an active VC 15 and a detour VC 16 as VCs for cell assembly and disassembly destinations of the CLAD devices 4, 11 and store cross-reference between the active and detour VCs and conduct changeover/switchback by an instruction from maintenance consoles 40, 41.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ATM (Asynchronous Transfer Mode) having a detour means for detour control in communication.
It relates to a TM communication network.

[0002]

2. Description of the Related Art Conventionally, an ATM communication network is generally configured as a communication network for asynchronous transfer mode communication.

For example, in the conventional Japanese Patent Application Laid-Open No. 9-93260, instead of using a simplified exchange, it is possible to recover from a failure at a virtual channel (hereinafter also referred to as VC) level. A technique is disclosed in which a routing table for promptly switching the spare is provided, and VC connections are divided into classes that perform VC connection rescue and classes that do not.

[0004]

However, in the above-mentioned ATM switch having the conventional CLAD function, there is no report on a technique for performing a bypass between a cell assembly and a VC unit to be disassembled. Therefore, the conventional ATM switch provided with the CLAD device has a problem that it is not possible to perform cell assembly and to bypass a communication path for each VC to be disassembled.

[0005] The present invention solves the above-mentioned conventional problems, and comprises the steps of assembling a CLAD device in an ATM communication network;
An object of the present invention is to provide an ATM communication network that enables a detour for each VC to be decomposed. More specifically, the present invention enables a detour for each VC in which a plurality of time slots are cellized, for each VC in which a plurality of frame relay connections are cellized, and for each VC in which a plurality of short cells are cellized. It is an object of the present invention to provide an ATM communication network.

[0006]

The present invention adopts the following constitution in order to solve the above problems.

[0007] In order to solve the above-mentioned problems, the AT of the present invention is used.
The M communication network is a virtual channel (V
As C), the working virtual channel and the bypass virtual channel are set in advance, and the association between the working virtual channel and the bypass virtual channel is held. With this configuration, it is possible to assemble the CLAD device and to make a detour to the ISDN line or the dedicated line in the unit of the VC to be disassembled.

[0008]

DETAILED DESCRIPTION OF THE INVENTION An ATM communication network according to the first aspect of the present invention is an ATM communication network for relaying between a plurality of ATM exchanges having a CLAD device and the ATM exchange. The current VC and the bypass VC are previously set as the cell assembling / disassembling means and the VC (virtual channel) of the cell assembling / disassembling destination.
And means for maintaining the relationship with. According to this configuration, in the ATM switch provided with the CLAD device, the CLAD device can be assembled and detoured for each VC to be disassembled.

Further, according to the second aspect of the present invention, the cell assembling / disassembling means is provided in accordance with an instruction from the maintenance console.
Means for switching the VC at the cell assembling / disassembling destination from working to standby. With this configuration, a detour operation can be performed according to an instruction from a maintenance person.

Further, the invention according to a third aspect of the present invention has a configuration comprising a cell assembling / disassembling means and a means for switching back a VC of a cell assembling / disassembling destination from a spare to a working one according to an instruction from a maintenance console. take. With this configuration, a switchback operation can be performed according to an instruction from a maintenance person.

[0011] Furthermore, the present invention according to claim 4 is the present invention,
A configuration including means for detecting the failure of C by monitoring the F5 end-to-end CC, monitoring the F5 segment CC, and monitoring the reception of the F5-RDI cell is adopted. With this configuration, it is possible to detect a failure in units of a working VC.

The invention according to claim 5 is characterized in that a spare V
A configuration is provided that includes means for detecting a failure of C by monitoring the F5 end-to-end CC, monitoring the F5 segment CC, and monitoring reception of the F5-RDI cell. With this configuration,
Fault detection can be performed in units of spare VCs.

[0013] Further, the present invention as defined in claim 6, further comprises:
, A cell assembling / disassembling means, and a means for automatically switching the VC of the cell assembling / disassembling destination from the working to the spare. With this configuration, loss of user data can be reduced by automatically bypassing the system without instructions from a maintenance person.

Further, the invention according to claim 7 is provided with a means for detecting a fault in the backup VC and not switching to the backup VC even if a fault is detected in the working VC. Take. With this configuration, it is possible to avoid bypassing to the backup VC in which a failure has occurred.

Further, the invention according to claim 8 is characterized in that a spare V
A configuration is provided that includes a cell assembling / disassembling unit that detects a failure of C and a unit that automatically switches back the VC of the cell assembling / disassembling destination from spare to working. With this configuration, the system automatically switches back without an instruction from the maintenance person, thereby enabling quick restoration to the working route and efficient use of the spare VC band.

Further, the present invention as defined in claim 9 is the present invention,
When a failure of C is detected, an automatic switching protection unit that automatically switches to a spare VC only when the failure has continued for a certain period of time is adopted. With this configuration, switching is not performed due to an instantaneous failure, and by adjusting the time from failure detection to switching according to the quality of the network, frequent switching operations are prevented from occurring, reducing cell loss, The detour band can be effectively used.

Further, according to the present invention, when the failure of the backup VC is detected, and when the recovery of the failure of the working VC is detected, the working VC is continued only for a certain period of time.
A configuration including an automatic switchback protection means for automatically switching back to C is adopted. With this configuration, it is possible not to switch back due to the momentary recovery of the working VC, not to switch back due to the momentary failure of the backup VC, and to recover from the failure of the working VC or the failure of the backup VC depending on the quality of the network. By adjusting the time until the reversion, it is possible to prevent the reversion operation from occurring frequently, to reduce the cell loss and to effectively use the bypass band.

Further, the invention according to claim 11 is the present invention
A configuration is provided that includes an automatic switching prohibition unit that suppresses automatic switching when a failure of C is detected. With this configuration,
Flexible detour switching according to the user's usage pattern can be performed.

Further, according to the twelfth aspect of the present invention, an automatic switchback prohibition that suppresses automatic switchback when a fault of a spare VC is detected and when recovery of a fault of a working VC is detected. A configuration having means is adopted. With this configuration, it is possible to flexibly switch back to the detour in accordance with the usage form of the user.

Further, according to the invention, an important VC which performs a fault monitoring of a working VC and a backup VC associated with a detour preferentially over a fault monitoring of a normal VC.
A configuration having priority monitoring means is adopted. With this configuration, it is possible to quickly detect a failure of a VC registered as a bypass and to reduce cell loss.

Further, in the invention according to claim 14, a spare VC is reserved and registered for the ISDN line, call control is performed when a failure occurs, and after the call is established, the working VC is switched to the spare VC. A configuration having means is adopted. With this configuration, in an ATM switch provided with a CALD means, cell assembly and detour using an ISDN line for each VC to be disassembled are enabled.

Further, the invention according to claim 15 is characterized in that, when the call is disconnected, the switchback protection time and the automatic switchback ignoring the automatic switchback prohibition are provided with an immediate switchback means. take. According to this configuration, the communication cost can be reduced by immediately switching back to the time of the failure of the bypass ISDN line.

Further, the invention according to claim 16 employs a configuration in which the immediate switchback means is applied to the frame relay CLAD. With this configuration, it is possible to bypass the frame relay for each ground.

The invention according to claim 17 employs a configuration in which the instantaneous switchback means is applied to a voice CLAD device.
With this configuration, the voice can be detoured for each ground.

Further, the invention according to claim 18 employs a configuration in which the immediate switchback means is applied to a short cell CLAD device. With this configuration, it is possible to make a detour for each short cell.

Next, an ATM communication network according to an embodiment of the present invention will be described in detail with reference to the drawings. 1 to 5
FIG. 1 is a diagram for explaining a configuration of an ATM communication network according to an embodiment of the present invention.

(Embodiment 1) FIG.
It is a typical example of a TM communication network, and shows a configuration example of an ATM communication network provided with a bypass circuit. In FIG. 1, an ATM exchange 1
Comprises a CLAD device 4 and accommodates non-ATM terminals in an ATM network.
, SW device 5, network IF device 6, and network IF device 7. The network IF device 6 includes a connection interface with the line 18, and the network IF device 7 includes a connection interface with the line 19.

The monitoring and control device 3 is further subdivided into detour information management means 2, important VC priority monitoring means 20, automatic switching prohibition means 21, automatic switching prohibition means 22, automatic switching protection means 23, automatic switching protection. Means 24 and an immediate switchback means 25.

In each of the above components, the detour information management means 2 holds various types of information necessary for detour control such as the association between the working VC and the backup VC. The monitoring control device 3 is a CL
AD device 4, SW device 5, network IF device 6, network IF
It monitors the failure of each device constituting the ATM switch 1 such as the device 7 and controls the detour. The CLAD device 4 accommodates non-ATM terminals, assembles and disassembles cells, and monitors a VC (virtual channel) failure. The SW device 5 performs cell exchange. The ATM switch 8 has the same configuration as the ATM switch 1.

The VC 15 is a spare VC. Working VC
When a failure occurs and when an instruction is given by a maintenance person, communication is performed by the VC 15. VC16 is the current VC
It is. If no failure has occurred, communication is performed by the VC 16. The ATM network 17 includes a plurality of devices equivalent to the ATM switch 1. The maintenance console 40 performs setting and control of the ATM switch 1, and a maintenance person can give a detour instruction.

An operation example of the ATM communication network configured as described above will be described with reference to FIG. First, the operation of associating the VC with the working and the spare will be described.
The maintenance person uses the maintenance console 40 to operate the CLAD device 4, the SW device 5, and the network IF device 6 of the ATM switch 1.
Then, the VC 15 is registered (S1). Similarly, the maintenance person uses the maintenance console 40 to
VC is connected to the LAD device 4, the SW device 5, and the network IF device 7.
16 is registered (S2).

Next, the maintenance person uses the maintenance console 40 to send the VC to the supervisory control device 3 of the ATM exchange 1.
15 is set as the working VC, and the VC 16 is set as the protection VC, that is, the association between the working VC and the protection VC is registered (S3). The monitoring control device 3 holds the registered contents in the detour information management means 2.

The maintenance person uses the maintenance console 41 to operate the CLAD device 11 of the ATM switch 8 and the SW device 1.
2 and the network IF device 13 to register the VC 15 (S1).
0 to S16). Similarly, the maintenance person uses the maintenance console 41 to operate the CLAD device 11 of the ATM switch 8.
Then, the VC 16 is registered in the SW device 5 and the network IF device 7 (S20 to S27). The maintenance person uses the maintenance console 41 to set the VC 15 as the working VC and the VC 16 as the spare VC for the monitoring control device 10 of the ATM exchange 8.
And register that. The monitoring control device 3 holds the registered contents in the detour information management means 2 (S31, S3
2).

Next, the operation of switching from the working VC to the backup VC will be described with reference to FIG. When the maintenance person instructs the ATM exchange 1 to make a detour using the maintenance console 40, the instruction is transmitted to the monitoring control device 3 (S4).
1). With this transmission, the monitoring control device 3 acquires the association between the working VC and the backup VC from the bypass information management means 2 (S410).

Subsequently, the monitoring control device 3 issues an instruction to the CALD device 4 to switch the cell assembly / disassembly destination VC based on the registered contents of the bypass information management means 2 (S42). The CLAD device 4 switches the VC of the cell assembly / disassembly destination according to the instruction of the monitoring control device 3 (S42).
0).

In the ATM exchange 8 as well, the maintenance person performs the same processing, so that the maintenance VC 15
Switching to C16 is completed (S43, S44).

Next, from the spare VC 16 to the working VC 15
The operation of switching back to is described with reference to FIG.

When the maintenance person instructs the ATM switch 1 to switch back using the maintenance console 40, the instruction is transmitted to the monitoring control device 3 (S51). Based on this transmission, the supervisory control device 3 sends the current V
C, the association of the backup VC is obtained (S510).

Subsequently, based on the registered contents of the detour information management means 2, the monitoring control device 3
An instruction is issued to switch the VC at which the cell is assembled and disassembled (S52). The CLAD device 4 switches the cell assembly / disassembly destination VC according to the instruction of the monitoring control device 3 (S52).
0).

In the ATM exchange 8 as well, the maintenance person performs the same processing to switch the spare VC 16 from the working VC
Switching to C15 is completed (S53, S54).

As described above, according to the first embodiment of the present invention, the active VC and the bypass VC are set in advance as the cell assembling / disassembling means of the CLAD device 4 and the cell assembling / disassembling destination VC. A detour information management means 2 as a means for retaining the relationship between the VCs for the current use and the detour use is provided. In accordance with an instruction from the maintenance console 4, the cell assembly / disassembly means and the cell assembly / disassembly in the CLAD device 4 are provided. A means for switching the previous VC from the working to the spare and a means for switching the VC from the working to the working are provided, so that the assembly of the CLAD device and the detour in the unit of the VC at the disassembling destination are performed by the instruction of the maintenance person. It is possible to do.

(Embodiment 2) In accordance with detection of occurrence and recovery of a failure, switching is automatically performed without the intervention of a maintenance person.
The operation in the case of performing the switching back operation will be described.

The maintenance person uses the maintenance console 41 to connect the VC1 to the supervisory control device 10 of the ATM switch 8.
The operation is the same as that of the first embodiment up to the operation of registering that 5 is the active VC and that VC 16 is the backup VC, and then the operation of the monitoring control device 10 to hold the registered contents in the bypass information management means 9.

The CLAD device 4 uses the current VC 15 to
An end-to-end CC and an F5 segment CC are performed to monitor a failure. If a disconnection is detected, F
5- Send the RDI cell and notify the monitoring control device 3 of the disconnection of the connection.

Also, when the F5-RDI cell is received, the monitoring controller 3 is similarly notified of the disconnection. Similarly, the CLAD device 4 sets the spare VC1
6 also monitors the failure, and notifies the monitoring control device 3 in the case of the connection disconnection. The monitoring control device 3 is a VC 15
Upon receiving the connection disconnection notification from the CLAD device 4,
With reference to the detour information management means 2, a backup VC is subsequently searched, and as a result, a VC 16 is obtained.

The supervisory control device 3 confirms whether or not a failure has occurred in the backup VC 16, and only when no failure has occurred, instructs the CLAD device 4 to switch from the working VC 15 to the backup VC 16 to the CLAD device 4. I do.

The CLAD device 4 sends the V
Upon receiving an instruction to switch from C15 to VC16, the cell assembly and the disassembly destination are switched from VC15 to VC16. When the CLAD device 4 detects the disconnection of the VC 15, the CLAD device 11 of the ATM switch 8
However, since the disconnection of the VC 15 is detected,
Also in the TM exchange 8, the same operation as the switching of the VC in the ATM exchange 1 is started, and the switching to the backup VC 16 is performed.

The above operation completes the automatic switching to the backup VC 16 due to the failure of the working VC 15.

Next, a description will be given of an operation of switching back from the standby VC 16 to the active VC 15 when the failure of the active VC 15 is restored.

The CLAD device 4 uses the current VC 15 to
An end-to-end CC and an F5 segment CC are performed to monitor a failure. When the restoration of the connection disconnection is detected, the transmission of the F5-RDI cell is stopped, and the monitoring and control device 3 is notified of the restoration of the connection disconnection.
Upon receiving the notification of the restoration of the VC 15 connection disconnection from the CLAD device 4, the monitoring control device 3
To check whether the VC 15 is bypassing. In the case of a detour, the VC 16 of the detour is obtained. Monitoring and control device 3
Instructs the CLAD device 4 to switch from the backup VC 16 to the working VC 15.

The CLAD device 4 sends the V
Upon receiving an instruction to switch from C16 to VC15, the cell assembling / disassembling and the cell assembling / disassembling destination are switched from VC16 to VC15. If the CLAD device 4 detects that the connection of the VC 15 has been restored, the CAD of the ATM switch 8 is reset.
Since the LAD device 11 detects the disconnection / recovery of the VC 15, the same operation as that of the VC switch-back in the ATM switch 1 is also started in the ATM switch 8, and the switch-back to the working VC 15 is performed.

The above operation completes the automatic switch back to the working VC 15 upon recovery from the failure of the working VC 15.

Next, when a failure occurs in the backup VC 16,
The operation of switching back from the backup VC 16 to the working VC 15 will be described.

The CLAD device 4 uses the spare VC 15 to
Perform 5 end-to-end CC and F5 segment CC,
Monitor for failures.

When the disconnection is detected, F5
Sending out the RDI cell and notifying the monitoring control device 3 of the disconnection of the connection; The monitoring control device 3
When the notification of the C16 connection disconnection is received from the CLAD device 4, it refers to the detour information management means 2 and checks whether or not the VC16 is detouring. In the case of detour, VC1 of the detour source
Get 5.

The monitoring control device 3 instructs the CLAD device 4 to switch from the backup VC 16 to the working VC 15.

The CLAD device 4 sends the V
Upon receiving an instruction to switch from C16 to VC15, the cell assembly and disassembly and the cell assembly and disassembly destination are changed from VC16 to VC15.
Switch to When the CLAD device 4 detects the disconnection of the VC 16, the CLA of the ATM switch 8 is
Since the disconnection of the VC 16 is also detected in the D device 11, the same operation as the VC switching back in the ATM exchange 1 is started in the ATM exchange 8, and the active VC 1
Switching back to 5 is performed.

The above operation completes the automatic switch back to the working VC 15 due to the occurrence of a fault in the protection VC 16.

As described above, according to the second embodiment of the present invention, in addition to the first embodiment, the current VAD
C means for detecting the failure of the C by monitoring the F5 end-to-end CC, monitoring of the F5 segment CC, and monitoring of the reception of the F5-RDI cell.
A means for detecting by monitoring the end-to-end CC, monitoring of the F5 segment CC, and monitoring of reception of the F5-RDI cell is provided. Means for automatically switching the VC from the working to the spare, detecting a fault of the spare VC, and assembling / disassembling means with the cell assembling / disassembling VC.
Means for automatically switching back from spare to working, and detecting failure of the spare VC, and automatically switching back from spare to working from the cell assembling / disassembling means and the cell assembly / disassembly VC. By preparing, CLAD without maintenance personnel's intervention
It is possible to assemble the device and to switch and switch back in units of VCs at the disassembly destination.

(Embodiment 3) By adding a means for retaining the switching protection time and the switchback protection time in the detour information management means to the second embodiment, the occurrence of a fault and the recovery can be continued for a certain period of time. The operation in the case of performing the switching and switching back operation only in the case will be described.

The maintenance person registers the switching protection time and the switchback protection time in the monitoring control device 3 from the maintenance console 40. The supervisory control device 3 determines whether the switching protection time and the switchback protection time are equal to each other.
To hold.

The operation up to the operation of the monitoring control device 3 receiving the notification of the disconnection of the working VC 15 from the CLAD device 4 is the same as that of the second embodiment.

When the monitoring control device 3 receives the notification of the disconnection of the VC 15 connection from the CLAD device 4, the monitoring control device 3 refers to the bypass information management means 2, acquires the switching protection time, and subsequently activates the automatic switching protection means 23. Automatic switching protection means 23
Before the switch protection time elapses, the active VC 15
When the failure of is restored, the switching operation is not performed.
When the switching protection time has elapsed, the switching operation is performed as in the second embodiment.

Next, the operation of the switchback protection time will be described.

When the monitoring control device 3 receives from the CLAD device 4 the notification of the restoration of the connection disconnection of the working VC 15 or the notification of the connection disconnection of the backup VC 16, the monitoring control device 3 From working VC
15 to obtain information on whether or not the vehicle is bypassing. If the detour is being performed, the switchback protection time is acquired from the detour information management unit 2 and the automatic switchback protection unit 24 is activated.

The automatic switchback protection means 24 does not perform the switchback operation if a failure occurs in the working VC 16 again before the switchback protection time elapses or if the failure of the backup VC 16 is recovered. When the switchback protection time has elapsed, a switchback operation is performed as in the second embodiment. The same operation is performed in the ATM exchange 8.

As described above, according to the third embodiment of the present invention, the second embodiment differs from the second embodiment in that the switching protection time monitoring means 23
And the switchback protection time monitoring means 24, the CLAD is performed only when the failure continues for a certain period of time or when the recovery continues for a certain period of time without the intervention of a maintenance person.
It is possible to assemble the device 4 and to switch and switch back in units of the VC to be disassembled.

(Embodiment 4) An operation in the case where an automatic switching and automatic switchback operation is suppressed by adding an automatic switching prohibition unit 21 and an automatic switchback prohibition unit 22 to Embodiment 2 will be described. I do.

First, the operation when the automatic switching operation is prohibited will be described. The maintenance person instructs the monitoring control device 3 from the maintenance console 40 to prohibit automatic switching. The monitoring control device 3 holds the automatic switching prohibition in the detour information management means 2. The operation up to the operation of the monitoring control device 3 receiving the notification of the disconnection of the connection of the active VC 15 from the CLAD device 4 is the same as that of the second embodiment.

When the monitoring control device 3 receives the notification of disconnection of the VC 15 from the CLAD device 4, it activates the automatic switching prohibiting means 21. The automatic switching prohibition unit 21 acquires the automatic switching prohibition information with reference to the detour information management unit 2, and does not perform the switching operation when the automatic switching is prohibited.

Next, the operation when the automatic switchback operation is prohibited will be described. The maintenance person instructs the monitoring control device 3 to prohibit automatic switchback from the maintenance console 40. The monitoring control device 3 holds the automatic switchback prohibition in the detour information management means 2. The switching back operation of the second embodiment is performed until the monitoring control device 3 receives the notification of the restoration of the disconnection of the working VC 15 from the CLAD device 4 or the operation of receiving the notification of the disconnection of the protection VC 16. Is the same as

Upon receiving the notification from the CLAD device 4, the monitoring control device 3 activates the automatic switchback prohibiting means 22. The automatic switchback prohibition unit 22 acquires the automatic switchback prohibition information with reference to the detour information management unit 2, and does not perform the switchback operation when the automatic switchback is prohibited.

As described above, according to the fourth embodiment of the present invention, by adding the automatic switching prohibition means 21 and the automatic switchback prohibition means 22 to the second embodiment, there is no need for maintenance personnel to intervene. , Automatically assembling and disassembling the cell of the CLAD device 4,
It is possible to suppress switching and switching back in VC units at the cell assembly / disassembly destination.

(Embodiment 5) The monitoring control device 3
It monitors a huge number of VC faults in the M exchange 1. For example, monitoring of faults of 5000 VCs may be performed. However, not all VCs need to be bypassed. Therefore, an important VC priority monitoring means 20 for preferentially monitoring the VC registered in the detour information management means 2 is added.

As described above, according to the fifth embodiment of the present invention, by adding the important VC priority monitoring means 20, it is possible to quickly detect the occurrence and recovery of the failure of the important VC registered for detour. And a quick detour with less cell loss becomes possible.

(Embodiment 6) The operation when the line 18 is an ISDN line will be described. First, the working and spare V
The operation of associating C will be described.

The maintenance person uses the maintenance console 40 to send the CLAD device 4 and the SW
An instruction to register the VC 15 is issued to the device 5 and the network IF device 6. The monitoring control device 3 includes a CLAD device 4 and a SW device 5
And the VC 15 in the network IF device 6. Similarly, the maintenance person issues a VC16 registration instruction to the monitoring and control device 3 to the CLAD device 4, the SW device 5, and the network IF device 7 using the maintenance console 40.

The monitoring control device 3 is configured such that the network IF device 7
In the case of the D line, the registration of the VC 16 is made a reservation registration and held inside the monitoring control device 3.

Using the maintenance console 40, the maintenance person registers that the VC 15 is the active VC and the VC 16 is the backup VC in the monitoring control device 3.

The monitoring control device 3 holds the registered contents in the detour information management means 2.

Using the maintenance console 41, the maintenance person performs the same registration for the ATM exchange 8 as for the ATM exchange 1.

Next, the operation of switching from the working VC 15 to the backup VC 16 will be described with reference to FIG. When the maintenance person instructs the ATM exchange 1 to make a detour using the maintenance console 40, the instruction is transmitted to the monitoring control device 3,
The monitoring control device 3 knows that the communication path of the backup VC 16 is an ISDN line based on the registered contents of the detour information management means 2.

The monitoring control device 3 issues a call instruction to the network IF device 7, and after the call is established, the VC 16 registered and reserved is transferred to the CLAD device 4, the SW device 5, and the network IF device 5.
Register with the device 7. Subsequently, the CLAD apparatus 4 is switched so that the VC at which the cell is assembled and disassembled is switched.
Give instructions. The CLAD device 4 switches the VC at which the cell is assembled and disassembled according to an instruction from the monitoring control device 3. ATM
In the exchange 8, the network IF device 14
When the call is established, the supervisory control device 10
Notify that a call has been received.

Upon receiving the notification of the incoming call from the network IF device 14, the monitoring control device 10 receives the VC1 registered in the CLAD device 11, the SW device 12, and the network IF device 14 in a reserved manner.
6 is registered and the current VC 15 is
From the backup VC 16 is issued. CLAD
The detour is completed when the device 11 switches the cell assembly and the VC to be disassembled from the VC 15 to the VC 16.

Next, the operation of switching back from the spare VC to the working VC will be described with reference to FIG. The maintainer
When the ATM switch 1 is instructed to switch back using the maintenance console 40, the instruction is transmitted to the monitoring and control device 3,
The monitoring and control device 3 sends a command to the CLAD device 4 based on the registered contents of the bypass information
Give instructions to switch. CLAD device 4
According to the instruction of the monitoring control device 3, the VC of the cell
Is switched.

The monitoring and control device 3 includes the CLAD device 4 and the S
The backup VC 16 is deleted from the W device 5 and the network IF device 7, and a call disconnection instruction is issued to the network IF device 7.

In the ATM exchange 8, the network IF device 1
4 detects the disconnection of the call and notifies the supervisory control device 10 that the instantaneous reverting means 35 is activated. When the instant switchback means 35 is activated, the automatic switchback inhibiting means 22
Is not activated.

The monitoring control device 10 is a CLAD device 11
The cell assembly and disassembly and the VC of the cell
To VC15. CLAD
The device 11 switches the VC according to an instruction from the monitoring control device 10. Finally, the monitoring control device 10
Is deleted from the CLAD device 11, the SW device 12, and the network IF device 14, and the switchback is completed.

As described above, according to the sixth embodiment of the present invention, the active VC is set as the cell assembly / disassembly of the CLAD device 11 and the VC for the cell assembly / disassembly, and the spare VC is monitored. A means for pre-registering in the control device and holding a relationship between the working VC and the spare VC; further, in accordance with an instruction from the maintenance console, a call connecting means and a call disconnecting means; VC and CLAD
Device and means for registering and deleting with the network IF device,
The CLAD apparatus further comprises means for disassembling the cell, means for switching the VC of the cell disassembly / disassembly from working to spare, means for switching the VC from spare to working, means for switching by incoming call, Means for switching back to CL by the instruction of the maintenance person.
It is possible to perform disassembly and reassembly of the AD device and detour to the ISDN line in VC units at the cell assembly and disassembly destination.

(Embodiment 7) An operation in the case of automatically switching to an ISDN line and performing a switchback operation without the intervention of a maintenance person in accordance with the detection of occurrence of a failure and recovery will be described.

The maintenance person uses the maintenance console 41 to send the VC control to the monitoring control device 10 of the ATM switch 8.
It is the same as that of the sixth embodiment up to the operation of registering that 15 is the active VC and that VC 16 is the backup VC, and the operation of the monitoring control device 10 to hold the registered contents in the bypass information management means 9.

The CLAD device 4 performs the F5 end-to-end CC and the F5 segment CC on the working VC 15, and monitors the failure. If a disconnection is detected, F5
Sending out the RDI cell and notifying the monitoring control device 3 of the disconnection of the connection; Also, F5-RDI
When a cell is received, the monitoring control device 3 is similarly notified of the disconnection of the connection.

When the monitoring control device 3 receives the notification of the disconnection of the VC 15 connection from the CLAD device 4, the monitoring control device 3 refers to the bypass information management means 2, searches for a spare VC, and obtains the VC 16. The monitoring control device 3 issues a calling instruction to the network IF device 7. After the call connection is completed, the monitoring and control device 3 stores the reserved VC 16 internally reserved with the CLAD device 4 and the SW
It is registered in the device 5 and the network IF device 7. Subsequently, the monitoring control device 3 instructs the CLAD device 4 to switch from the working VC 15 to the backup VC 16.

The CLAD device 4 sends the V
Upon receiving an instruction to switch from C15 to VC16, the cell assembling / disassembling and the cell assembling / disassembling destination are switched from VC15 to VC16. In the ATM exchange 8, the network IF device 14 notifies the supervisory control device 10 that the call has been received when the call with the network IF device 7 is established.

When the supervisory control device 10 receives the notification of the incoming call from the network IF device 14, the VC1 registered in the CLAD device 11, the SW device 12, and the network IF device 14
6 is registered, and an instruction to switch from the working VC 15 to the backup VC 16 is issued to the CLAD device 11. The CLAD device 11 changes the cell assembly from VC15 to VC16,
The detour is completed by switching the VC at the cell assembly / disassembly destination. By the above-described operation, automatic switching to the backup VC 16 due to the occurrence of the failure of the VC 15 is completed.

Next, a description will be given of an operation of switching back from the standby VC 16 to the active VC 15 when the failure of the active VC 15 is restored. The CLAD device 4 performs the F5 end-to-end CC and the F5 segment CC on the working VC 15, and monitors the failure.

When the recovery from the disconnection is detected, the transmission of the F5-RDI cell is stopped, and the monitoring and control device 3 is notified of the recovery from the disconnection.

When receiving the notification of the restoration of the disconnection of the VC 15 from the CLAD device 4, the monitoring control device 3 refers to the detour information management means 2 and checks whether or not the VC 15 is detouring. In the case of a detour, the VC 16 of the detour is obtained.

The monitoring control device 3 instructs the CLAD device 4 to switch from the backup VC 16 to the working VC 15. Next, the monitoring control device 3 includes the CLAD device 4,
The backup VC 16 is deleted from the SW device 5 and the network IF device 7, and a call disconnection instruction is issued to the network IF device 7.

In the ATM exchange 8, the network IF device 1
4 detects the disconnection of the call and notifies the supervisory control device 10 that the instantaneous reverting means 35 is activated. When the instant switchback means 35 is activated, the automatic switchback inhibiting means 22
Is not activated.

The monitoring control device 10 includes a CLAD device 11
The cell assembly and disassembly and the VC of the cell
To VC15. CLAD
The device 11 switches the VC according to an instruction from the monitoring control device 10. Finally, the monitoring control device 10
To the CLAD device 11, the SW device 12, and the network IF device 1.
4 and the switchback is completed.

Next, when a failure occurs in the backup VC 16,
The operation of switching back from the backup VC 16 to the working VC 15 will be described. The CLAD device 4 uses the spare VC 16
Perform 5 end-to-end CC and F5 segment CC,
Monitor for failures. When the disconnection is detected, an F5-RDI cell is transmitted, and the monitoring and control device 3 is notified of the disconnection.

When the monitoring control device 3 receives the notification of the disconnection of the VC 16 from the CLAD device 4, the monitoring control device 3 refers to the detour information management means 2 and checks whether or not the VC 16 is detouring.
In the case of the detour, the VC 15 of the detour source is obtained.

The monitoring control device 3 instructs the CLAD device 4 to switch from the backup VC 16 to the working VC 15. The CLAD device 4 sends the VC1
When receiving the switching instruction from VC6 to VC15, the cell assembling / disassembling and the cell assembling / disassembling destination are switched from VC16 to VC15.

Next, the monitoring control device 3
, The SW device 5, and the network IF device 7, the backup VC1
6 is deleted, and a call disconnection instruction is issued to the network IF device 7.

In the ATM exchange 8, the network IF device 1
4 detects the disconnection of the call and notifies the supervisory control device 10 to activate the immediate reverting means 35. When the instant switchback means 35 is activated, the automatic switchback prohibition means 22 and the automatic switchback protection means 24 are not activated.

The monitoring control device 10 instructs the CLAD device 11 to switch the cell assembly and the VC to be disassembled from VC16 to VC15. The CLAD device 11 performs VC switching according to an instruction from the monitoring control device 10. Finally, the monitoring control device 10 includes the CLAD device 11 and the SW
The VC 16 is deleted from the device 12 and the network IF 14, and the switching back is completed.

As described above, according to the seventh embodiment of the present invention, in addition to the fifth embodiment, the current VAD
C means for detecting the failure of the C by monitoring the F5 end-end CC, monitoring of the F5 segment CC, and monitoring of the reception of the F5-RDI cell, and monitoring the failure of the spare VC by monitoring the F5 end-end CC; Means for detecting by monitoring the segment CC and monitoring for reception of the F5-RDI cell; further means for detecting a failure of the working VC; cell assembling / disassembling means; Switching means for automatically switching, and further comprising a means for detecting a failure of the spare VC, and a means for automatically switching back the VC of the cell assembly and disassembly destination from the spare to the working, It is possible to assemble the CLAD device, switch to the ISDN line for each VC at the disassembly destination, and switch back without the intervention of a maintenance person.

In the sixth embodiment of the present invention, which describes automatic switching and switching back to the ISDN line,
The automatic switching protection unit 23, the automatic switchback protection unit 24, and the automatic switching prohibition unit 21 and the automatic switchback prohibition unit 22 described in the fourth embodiment can be applied.

FIG. 5 shows a configuration example of the basic functions of the bypass information management means in the first to seventh embodiments.
In FIG. 5, the detour source VC is the active VC 15, and the detour destination VC is the backup VC 16. The switching holding time from the working VC 15 to the backup VC 16 is 5 seconds. The switchback holding time is 60 seconds. It is possible to prohibit switching, and also to prohibit switching back.
These conditions can be set from the maintenance console 40.

[0111]

As described above, the present invention provides a method for assembling and disassembling a cell of a CLAD device in an ATM communication network including a plurality of ATM switches provided with a CLAD device and a plurality of ATM switches for relaying between the ATM switches. As VC earlier,
By setting the working VC and the bypass VC in advance and providing a means for maintaining the relationship between the working VC and the bypass VC, the cell assembly and disassembly and the cell assembly and disassembly can be performed in the ATM switch provided with the CLAD device. The effect of being able to bypass the communication path for each VC is obtained.

[Brief description of the drawings]

FIG. 1 is a typical block diagram of an ATM communication network showing first to seventh embodiments of the ATM communication network of the present invention.

FIG. 2 shows a working VC and a spare VC according to the first embodiment.
Sequence diagram showing an example of the association operation of

FIG. 3 shows a working VC and a spare VC according to the first embodiment.
Sequence diagram showing an example of switching operation of

FIG. 4 is a diagram illustrating a working VC and a spare VC according to the first embodiment.
Sequence diagram showing an example of a switchback operation of

FIG. 5 is a table showing basic functions of a detour information management unit according to the first to seventh embodiments.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 ATM exchange 2 detour information management means 3 supervisory control device 4 CLAD device 5 SW device 6 network IF device 7 network IF device 8 ATM exchange 9 detour information management means 10 supervisory control device 11 CLAD device 12 SW device 13 network IF device 14 network IF device 15 working VC 16 backup VC 17 ATM network 18 lines 19 lines 20 important VC priority monitoring means 21 automatic switching prohibition means 22 automatic switching prohibition means 23 automatic switching protection means 24 automatic switching protection means 25 immediate switching means 30 Important VC priority monitoring means 31 Automatic switch prohibition means 32 Automatic switchback prohibition means 33 Automatic switch protection means 34 Automatic switchback protection means 35 Immediate switchback means 40 Maintenance console 41 Maintenance console

Claims (18)

[Claims] 1. An ATM communication network for relaying between a plurality of ATM exchanges provided with a CLAD device and said ATM exchange, comprising a cell assembling / disassembling means of said CLAD device and a virtual channel (VC) as a cell assembling / disassembling destination. An ATM communication network, comprising: means for presetting a working virtual channel and a bypass virtual channel, and holding a relationship between the working virtual channel and the bypass virtual channel. 2. The ATM communication network further comprises the AT
A maintenance console for setting and controlling the M exchange, and a means for switching the cell assembling / disassembling means and the cell assembling / disassembling destination virtual channel from the working virtual channel to the backup virtual channel in accordance with an instruction from the maintenance console; The ATM communication network according to claim 1, further comprising: 3. The ATM communication network further comprises the AT
A maintenance console for setting and controlling the M exchange, and a means for switching the cell assembling / disassembling means and the cell assembling / disassembling destination virtual channel from the spare virtual channel to the working virtual channel in accordance with an instruction from the maintenance console. 3. The ATM communication network according to claim 2, comprising: 4. The failure of the working virtual channel,
4. The ATM communication network according to claim 3, further comprising means for detecting by monitoring the F5 end-to-end CC, monitoring the F5 segment CC, and monitoring the reception of the F5-RDI cell. 5. The failure of the spare virtual channel,
5. The ATM communication network according to claim 4, further comprising means for detecting by monitoring an F5 end-to-end CC, monitoring an F5 segment CC, and monitoring reception of an F5-RDI cell. 6. The system further comprises means for detecting a failure of the working virtual channel, cell assembling / disassembling means, and means for automatically switching a cell assembling / disassembling destination virtual channel from a working virtual channel to a backup virtual channel. The ATM communication network according to claim 5, wherein: 7. The apparatus according to claim 1, further comprising means for detecting a failure of the backup virtual channel and not switching to the backup virtual channel even if a failure is detected in the working virtual channel. Item 6. AT according to item 6.
M communication network. 8. A cell assembling / disassembling means for detecting a failure of the spare virtual channel, and means for automatically switching a virtual channel of the cell assembling / disassembling destination from the spare virtual channel to the working virtual channel. The ATM communication network according to claim 7, wherein: 9. An automatic switching protection means for automatically switching to the backup virtual channel only when a failure of the working virtual channel is detected for a certain period of time upon detecting a failure of the working virtual channel. 9. The ATM communication network according to claim 8. 10. Automatic switchback protection for automatically switching back to the working virtual channel only when the failure has been detected for the protection virtual channel and recovery of the working virtual channel for a predetermined period of time. 10. The method according to claim 9, further comprising: means.
An ATM communication network as described. 11. The ATM communication network according to claim 10, further comprising: automatic switching prohibition means for suppressing automatic switching when a failure of said working virtual channel is detected. 12. An automatic fail-back prohibition unit that suppresses automatic fail-back when a failure of the protection virtual channel is detected and a recovery of a failure of the working virtual channel is detected. The ATM communication network according to claim 11, wherein: 13. The fault monitoring of the working virtual channel and the backup virtual channel associated for the detour is performed with higher priority than the fault monitoring of the normal virtual channel.
13. The ATM communication network according to claim 12, further comprising important virtual channel priority monitoring means. 14. The method according to claim 1, wherein said spare virtual channel is ISD
14. The system according to claim 13, further comprising means for making a reservation registration to an N line, performing call control when a failure occurs, and switching from the working virtual channel to the protection virtual channel after a call is established. ATM communication network. 15. The system according to claim 1, further comprising an immediate switch-back means for immediately switching back when the call is disconnected, ignoring a switch-back protection time and an automatic switch-back prohibition. 14. The ATM communication network according to claim 14. 16. The ATM communication network according to claim 15, wherein said immediate switchback means is applied to a frame relay CLAD. 17. The method according to claim 17, wherein the instant switchback means is a voice CLAD.
The AT according to claim 15, wherein the AT is applied to a device.
M communication network. 18. The method according to claim 18, wherein the immediate cell switching means is a short cell CL.
The ATM communication network according to claim 15, wherein the ATM communication network is applied to an AD device.