JPH07231349A - Subscriber accommodation system - Google Patents

Abstract

PURPOSE:To exchange the accommodation node of subscriber terminals without manual intervention in a short service interruption time when a fault is generated at any service node concerning the subscriber accommodation system for assigning the subscriber terminals to plural service nodes. CONSTITUTION:A master service node 51 is set among the service nodes connected to a subscriber access device 2 for accommodating the subscriber terminals. Inside the master service node 51, a memory 8 is provided to store which service nodes the respective subscriber terminals 11-1n are connected to and a processor 71 is provided to detect the fault states of the other service nodes 52-5n and to instruct the accommodation of the subscriber terminal of the down service node in the normal service node when any service node is down.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a subscriber accommodation system,
In particular, the present invention relates to a subscriber accommodation system in which subscriber terminals accommodated in a subscriber access device are distributed and accommodated in a plurality of service nodes via the subscriber access device.

[0002]

2. Description of the Related Art When accommodating a subscriber terminal in a service node such as an exchange, the subscriber terminal is distributed and accommodated in a plurality of service nodes for the purpose of risk distribution. As a conventional method of allocating subscriber terminals to a plurality of service nodes, for example, as described in NTT Technology Journal September 1992 issue (pages 46 to 49), a subscriber system having a cross connect (XC) mechanism is provided. Semi-fixed bus connection device (LXM; Subscriber Lin)
e Cross Connect Module) is used to distribute the signal line of the analog subscriber terminal and the signal line of the digital subscriber terminal to each service node according to the station conditions. The maintenance system changes the service node (accommodation destination) to which the subscriber terminal is distributed, on a manual basis. FIG. 4 is a block diagram showing such a conventional subscriber accommodation system.

A plurality of subscriber accommodation devices (RT)
An appropriate number of analog subscriber terminals 91 and digital subscriber terminals 92 are connected to 93 _{1 to} 93 _n , respectively. These subscriber accommodation devices 93 _{1 to} 93 _n are connected to the cross connect switch 94. On the other hand, a plurality of analog service nodes 96 _{1 to} 96 _n and digital service nodes 97 _{1 to} 97 _n are also connected to the cross-connect switch 94. The cross-connect switch 94 distributes the analog subscriber terminal 91 to each of the analog service nodes 96 _{1 to} 96 _n for each subscriber terminal accommodated in each of the subscriber accommodation devices 93 _{1 to} 93 _n, and sets the digital subscriber terminal 92 to the digital subscriber terminal 92. Each digital service node 97 ₁
To 97 _n , and is configured to be controlled by the operation system 95. In the figure, a thick solid line shows a connection path to the analog subscriber terminal 91, and a thick broken line shows a connection path to the digital subscriber 92. When a failure occurs in a specific service node, the maintenance person analyzes the alarm of the alarm device to recognize the failure, and the operation system 9
It is necessary to intervene by means of 5 to replace the accommodated subscriber terminal of the faulty service node with another normal service node. This replacement is done by cross-connect switch 94
This is done by internally changing the connection route.

[0004]

In the subscriber accommodating method as described above, when the service is to be relieved to a subscriber when any one of the service nodes fails, the maintenance system determines the maintenance system (operation system). Since the subscriber terminal is to be accommodated in a normal service node through the manual operation via the, it requires manpower and the service interruption time tends to be long. Furthermore, a cross-connect mechanism having an interface function for the operating system is required.

An object of the present invention is a subscriber accommodation system in which subscriber terminals are distributed to a plurality of service nodes, and when any one of the service nodes fails, a short service interruption time is required without human intervention. It is an object of the present invention to provide a subscriber accommodation method capable of accommodating subscriber terminals.

[0006]

In the subscriber accommodating method of the present invention, a master service node serving as a master is selected from a plurality of service nodes, and a signal line from a subscriber terminal is concentrated to collect each service node. Switch means for distributing to each of the service nodes, and communication means for exchanging control information with each of the service nodes are provided in the subscriber access device, and the master service node stores the service node information of the accommodation terminal of each subscriber terminal. Memory means for holding and first control means for concentrating and controlling the switching means so that the signal of the self-accepting subscriber terminal is connected to the self-master service node, and for monitoring the fault condition of each service node. A signal of a self-contained subscriber terminal is provided to each of the service nodes except the master service node so that the signal of the self-accommodating subscriber terminal is connected to the service node. It said switch means concentrator controlled, and second control means are provided which can communicate with the first control means.

[0007]

A master service node is set, and a failure is detected in the memory means for storing the accommodation terminal information of the subscriber terminal and another service node in the master service node, and the subscriber terminal is normally operated when the failure occurs. Since the first control means for relocating the service node operating to the service node is provided, when the service node goes down,
Rapid accommodation replacement is performed from the faulty service node, and the service interruption time is shortened.

[0008]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a subscriber accommodation system according to an embodiment of the present invention.

The subscriber terminals 1 ₁ to 1 _n are housed in the subscriber access device 2. On the other hand, a plurality of service nodes are provided, one of which is the master service node 5 ₁ and the other is normal service nodes 5 _{2 to} 5 _n . In the following description, a normal service node that is not the master service node will be simply called a service node. These master service node 5 ₁ and the service node 5 ₂ to 5 _n is subscriber access equipment 2 is connected to the master service node 5 ₁ and each subscriber terminal 1 ₁ to 1 _n via the subscriber access equipment 2 The service nodes 5 _{2 to} 5 _n are distributed and accommodated.

Inside the subscriber access device 2, each subscriber
Person terminal 1₁~ 1_nMaster service by collecting signal lines from
Node 5₁And service node 5₂~ 5_nSort into
Distribution concentrator switch 3 and master service node 5₁
And service node 5₂~ 5 _nMesse provided for each
Communication unit 4₁~ 4_nAnd are provided. Message
Believer 4₁~ 4_nIs a communication means, and the corresponding master server
Service node 5₁And service node 5₂~ 5_nBetween
Exchange control information in accordance with the received control information
This is for controlling the distribution line collecting switch 3.

The master service node 5 ₁ is connected between the network 9 ₁ connected to the distribution line concentrator switch 3 in the subscriber access device 2 via a line and the message communication unit 4 ₁ in the subscriber access device 2. A message communication unit 6 ₁ for exchanging control information with each of the subscriber terminals 1 ₁ to 1
_The memory 8 stores which service node (or master service node) _n is stored in, and the processor 7 ₁ that controls the master service node 5 ₁ as a whole. The message communication unit 6 ₁ , the processor 7 ₁ and the memory 8 are connected via an internal bus. Here, the memory 8 is a memory means, and the processor 7 ₁ constitutes a first control means.

On the other hand, normal service nodes 5 _{2 to} 5 _n
Between the networks 9 _{2 to} 9 _n connected to the distribution line concentrating switch 3 in the subscriber access device 2 and the message communication units 4 ₂ to 4 _n in the subscriber access device 2, respectively. a message communication unit 6 ₂ to 6 _n for exchanging control information in the second control means is a by processor 7 ₂ for the service node 5 ₂ to 5 _n overall control -
7 _n and. Message communication unit 6 ₂ ~
It is connected via an internal bus and 6 _n and the processor 7 ₂ to _7-n. Furthermore, the processor 7 ₂ to _7-n is connected to the processor ₇₁ of the master service node 5 _1, thereby, the master service node 5 ₁ side, the failure of the other service node 5 ₂ to 5 _n It can be detected.

[0013] Processor ₇₁ of the master service node 5 _1, as a signal of its own housing subscriber terminal is connected to the master service node 5 _1, the subscriber access device 2 of the message and the message communication unit 6 ₁ The distribution line concentrating switch 3 is subjected to line concentrating control via the communication unit 4 _1, and the fault condition of the other service nodes 5 _{2 to} 5 _n is monitored. Further, when the processor 7 ₁ detects a failure occurrence in any of the other service nodes 5 _{2 to} 5 _n , the processor 7 ₁ refers to the contents of the memory 8 and detects a failure in the normally operating service node. When instructing to accommodate the accommodating subscriber terminal of the generated service node and detecting recovery from the failure,
It is configured to instruct to disconnect the subscriber terminal which has been instructed to be accommodated. Also, the service node 5 ₂
5 processor 7 ₂ to _7-n of _n are each as-signal of the receiving subscriber terminal is connected to the own service node 5 ₂ 5 _n, also in response to an instruction from the master service node 5 ₁ Failure Via the message communication units 6 _{2 to} 6 _n and the message communication units 4 ₂ to 4 _n on the side of the subscriber access device 2 so as to connect or disconnect the accommodating subscriber terminal of the service node in which the error occurs. It is configured to control the distribution collecting switch 3 for collecting lines. In this embodiment, the link of control information between the message communication units 6 _{2 to} 6 _n and the message communication units 4 ₂ to 4 _n on the side of the subscriber access device 2 is different from the signal of the subscriber terminal. It is fixedly assigned.

The link between the subscriber access device 2 and each service node is larger than the required capacity determined by the line concentrating ratio, considering that the number of accommodated subscriber terminals increases when a failure occurs in another service node. Have capacity.
However, in normal times, the line-concentration control is performed so that the lines are connected within an area having a required capacity determined by the line-concentration ratio. Figure 2
Is a conceptual diagram of the structure of the link. When another service node goes down due to a failure, the area to be concentrated along with accommodating the subscriber terminal of the failed service node. And the number of accommodations will increase.
The margin of the link capacity is determined by the number of service nodes, the number of service nodes that are expected to cause a failure at the same time, and the like.

Next, the operation of this embodiment will be described. Normal time
The master service node 5₁, Each service node 5₂
~ 5_nAlso, the node that owns the subscriber terminal
To connect to the message communication unit 6₂~ 6_nThrough
To the subscriber access device 2, and this instruction
The distribution collecting switch 3 is controlled. As a result,
Is indicated by a thick solid line in the distribution concentrating switch 3.
Each subscriber terminal 1 ₁~ 1_nShall be housed.

Next, a case where a failure occurs in any of the service nodes and the service node goes down will be described. here,
Assuming that the service node 5 _n goes down will be described with reference to the control flow of FIG.

When the master service node 5 ₁ detects the down of the service node 5 _n , the master service node 5 ₁ causes the normally operating service node, for example, the processor 7 ₂ of the service node 5 ₂ to operate as shown in FIG. 3 (a). On the other hand, based on the information in the memory 8, the processor 7 ₁ instructs to accommodate the subscriber terminal accommodated by the faulty service node 5 _n . Processor 7 _second service node 5 ₂ which has received this instruction, to the subscriber access device 2 via the message communication unit 6 _2, the signal of the subscriber terminal is instructed also to connect to the own service node 5 ₂ Concentration control is performed, and as a result, the subscriber terminal accommodated in the faulty service node 5 _n is relocated to the normally operating service node 5 ₂ . In FIG. 1, this accommodation change is indicated by a broken line in the distribution concentrating switch 3.

[0018] To return to the original containment configuration upon restoration of the service node 5 _n failures, as shown in FIG. 3 (b), the processor 7 _first master service node 5 _1, the restoration of the service node 5 _n When detected, service node 5 ₂
The processor 7 ₂ is instructed to disconnect the subscriber terminal accommodated in the faulty service node 5 _n and relocated. As a result, the service node 5
Processor 7 _{2 2} to the subscriber access device 2 via the message communication unit 6 _2, the signal of the subscriber terminal is instructed concentrates controlled to disconnect from the self service node 5 _2, After that, the cutting Is notified to the master service node 5 ₁ side. When the processor ₇₁ of the master service node 5 ₁ to confirm this notice, instructs restart the processor 7 _n the service node 5 _n was restored, as a result, will return to its original containment configuration.

As described above, the accommodation is automatically and promptly replaced between the service nodes without the intervention of the operating system or the maintenance person, and as a result, the service interruption time can be shortened. Since it is sufficient for the subscriber access device to operate under the logical sum (OR) condition of the instructions from each service node, no special control is required for the subscriber access device.

Although the embodiment of the present invention has been described above, the present invention is also applied to the case where the subscriber access device accommodates subscriber terminals belonging to a plurality of station numbers and is distributed to a plurality of service nodes. it can.

[0021]

As described above, according to the present invention, a master service node is set, and in this master service node, memory means for storing accommodation terminal information of a subscriber terminal and a failure of another service node. And the first control means for relocating the subscriber terminal to the normally operating service node in the event of a failure, providing prompt accommodation from the failed service node when the service node goes down. Since service switching is performed autonomously and the service interruption time is shortened, distributed accommodation of subscriber terminals to multiple service nodes without complex control of subscriber access equipment and accommodation in a short time for reliability improvement There is an effect that both switching can be achieved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a subscriber accommodation system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a link for each service node in the subscriber access device.

3 (a) and 3 (b) are control flow diagrams showing operations at the time of occurrence of a failure and at the time of recovery, respectively.

FIG. 4 is a block diagram showing an example of a conventional subscriber accommodation system.

[Explanation of symbols]

1 ₁ to 1 _n subscriber terminal 2 subscriber access 1 device 3 distribution line concentrator switch 4 ₁ to 4 _n , 6 _{1 to} 6 _n message communication unit 5 ₁ master service node 5 _{2 to} 5 _n service node 7 _{1 to} 7 _n processor 8 memory 9 _{1 to} 9 _n network 91 analog subscriber terminal 92 digital subscriber terminal 93 _{1 to} 93 _n subscriber accommodation device 94 cross-connect switch 95 operation system 96 _{1 to} 96 _n analog service node 97 _{1 to} 97 _n digital service node

Front page continuation (71) Applicant 000005108 Hitachi, Ltd. 4-6, Kanda Surugadai, Chiyoda-ku, Tokyo (72) Inventor Tadashi Mizuguchi 5-7-1, Shiba, Minato-ku, Tokyo Within NEC Corporation (72 ) Inventor Senji Kawamura 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Inventor Yumiko Nishi 216 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Stock company Hitachi Information & Communication Division (72) Inventor Nobuo Hasesaka 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Fujitsu Limited (72) Inventor Rei Sasaki 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd.

Claims (2)

[Claims] 1. A subscriber accommodation system in which subscriber terminals accommodated in a subscriber access device are distributedly accommodated in a plurality of service nodes via the subscriber access device, wherein a master is selected from the plurality of service nodes. A master service node is selected, switch means for concentrating the signal lines from the subscriber terminals and distributing them to the service nodes, and communication means for exchanging control information with the service nodes Provided in the personal access device, the master service node is provided with a memory means for holding accommodation service node information of each subscriber terminal, and a signal of the self-contained subscriber terminal is connected to the master service node. First control means for concentrating and controlling the switch means and monitoring a fault condition of each of the service nodes, Each of the service nodes except the master service node is capable of concentrating and controlling the switch means so that the signal of the self-accepting subscriber terminal is connected to the self-service subscriber node, and is capable of communicating with the first control means. A subscriber accommodating system characterized in that two control means are provided. 2. The first control means, when detecting the occurrence of a failure in any one of the service nodes, causes the normally operating service node to receive the accommodated subscriber terminal of the service node in which the failure has occurred. And instructing the normally operating service node to disconnect the subscriber terminal instructed to accommodate, when the restoration of the failure is detected, the second control means controls the accommodation Is instructed, the switch means is controlled so that the signal of the accommodated subscriber terminal of the faulty service node is connected to its own service node, and when the disconnection is instructed, the instructed subscriber terminal is instructed. 2. The subscriber accommodation system according to claim 1, wherein the switch means is controlled so as to disconnect the signal.