JP3632612B2 - Remote side switch reset method and switch system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a remote-side switch reset method and switch system, and more particularly to a remote-side switch reset method and switch system for resetting a remote switch connected to a host-side switch via a V5 interface.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an exchange system is known in which a remote exchange (AN) that accommodates one or more subscriber telephones is connected to a host exchange (LE) through a V5 interface. Here, the V5 interface is an interface specification defined in the standards ETS 300 324-1 and ETS 300 347-1 issued by the European Telecommunications Standards Institute (European Telecommunications Standards Institute), and also the International Telecommunication Union Electric It is an interface specification defined in the communication standardization department (ITU-T) recommendations G964 and G965, and consists of V5.1 and V5.2.
[0003]
In the remote exchange (AN), the line type (analog line or digital line) of the subscriber telephone set (subscriber terminal) accommodated by the AN and other information are stored. The host-side exchange (LE) stores subscriber terminal information possessed by all ANs to which the LE is connected. Between these AN and LE, digital data such as voice data is transmitted by a V5 interface having 32 time slots each of 64 kbps as a basic unit. Control data is transmitted in a specific time slot (communication channel).
[0004]
In an exchange system in which the above AN and LE are connected via the V5 interface, if the AN stops operating for some reason, conventionally, maintenance personnel have been sent to the AN to recover the system. A reset is performed by directly pressing the attached reset button. This reset initializes the AN and clears the information stored in the AN, such as the line information of the subscriber telephone, but does not clear the program for operating the AN itself, based on the recommendation of the V5 interface. The restart operation is performed on both the LE side and the AN side.
[0005]
This restart operation is always performed when a reset is performed on the LE side or AN side, or when a signal line for transmitting signals between them is disconnected / restored. Data is transmitted and received so that information and the like match on both the LE side and the AN side. Actually, since all information is held by the LE side, information on the subscriber telephone is exchanged from the LE to the AN direction, and a message indicating the completion of reception is transmitted from the AN to the LE direction.
[0006]
[Problems to be solved by the invention]
However, in the conventional switching system described above, in order to reset one or a plurality of remote switching systems (AN), it is necessary for a maintenance person to go to the AN installed at a remote location with respect to the LE. Takes time and cannot be reset immediately. Further, even if it is attempted to reset a plurality of ANs at the same time, it cannot be reset at the same time because of the above movement time.
[0007]
The present invention has been made in view of the above points, and an object of the present invention is to provide a remote-side switch resetting method and switch system that can immediately reset a remote-side switch when a reset need arises.
[0008]
Another object of the present invention is to provide a remote-side switch reset method and switch system that can simultaneously reset a plurality of remote-side switches.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the reset method of the present invention provides a LAPV5 for a remote exchange that needs to be reset among one or more remote exchanges to which a host exchange is connected via a V5 interface. A first step in which a specific message transmitted at the time of establishing a layer 2 link on the protocol is defined and transmitted as reset request data; and a second step in which the remote exchange receiving the reset request data autonomously performs a reset operation And a step.
[0010]
In order to achieve the above object, the exchange system of the present invention is connected to a single host side exchange and a V5 interface corresponding to one or more terminal devices of V5 related messages in the host side exchange. In the exchange system that includes one or more remote telephones, each of which includes one or more subscriber telephones, the host exchange is one of the one or more remote exchanges that is reset. There is a transmission means for determining a specific message transmitted when establishing a layer 2 link on the LAP V5 protocol as a reset request data and transmitting it via a terminating device to a remote side switch in need. , With a means for resetting autonomously when a specific message is received .
[0011]
In the method and system for resetting a remote side switch according to the present invention, a specific message transmitted at the time of establishing a layer 2 link on the LAPV5 protocol is determined as reset request data and transmitted to the remote side switch. Since the reset operation is performed when the message is received, the remote side switch is controlled by the host side switch even if the remote side switch is not installed or the layer 2 link is not established. Can be reset.
[0012]
In order to achieve the above object, the present invention provides a specific message having the same contents to a plurality of remote exchanges that need to be reset when there are a plurality of remote exchanges that need to be reset. and a reset request data, and outputs at the same time. In the present invention, a plurality of remote exchanges can be reset simultaneously.
[0013]
In order to achieve the above object, the present invention is characterized in that a message to be transmitted at the time of establishing a layer 2 link is determined and transmitted as a specific message to be reset request data. In the present invention, even if the layer 2 link is not established, the reset request data can be transmitted from the host-side switch to reset the remote-side switch that needs to be reset.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a block diagram of an embodiment of an exchange system according to the present invention. This embodiment shows an exchange system using a data link layer (LAPV5) protocol defined in ETS300 324-1 (V5.1) and ETS300 347-1 (V5.2) described above.
[0015]
In FIG. 1, a host-side exchange (LE) 1 is roughly composed of V5 related message terminating devices 21 to 2n, a system manager 3 for controlling a V5 interface, and a speech path switch 4. The remote side exchanges (AN) 51 and 5m are connected to the terminal devices 21 and 2n that terminate the LAPV5 protocol in the host side exchange (LE) 1 using the LAPV5 protocol and each of the subscriber telephones 61 to 6j. , 71-7k are accommodated.
[0016]
In this exchange system, by switching the switches in the remote side exchanges (AN) 51 and 5m in accordance with an instruction from the system manager 3 that controls the LE1, (1) they are accommodated in the same remote side exchange (AN). (2) By connecting the communication path switch 4 in the host-side exchange (LE) 1 and the switches in the remote-side exchanges 51 and 5m, the host-side exchange (LE) 1 is connected. Are connected to the subscriber telephones accommodated in all the remote-side exchanges 51 and 5m connected to the terminal devices 21 to 2n installed in the network. In this way, the function as an exchange is realized.
[0017]
FIG. 2 shows the format of the data format defined by the LAPV5 protocol used for communication between the host-side exchange (LE) 1 and the remote-side exchange (AN) 51 (or 5 m) on the exchange system described above. Show. In the figure, in the data format, “EFaddr” is a subscriber identification number for the ISDN subscriber negotiated between the communicating LE 1 and AN 51. “DLaddr” is divided into SAPI (Service Access Point Identifier) that indicates the type of service provided to the upper layer, etc., and TEI (Terminal Endpoint Identifier) that indicates individual subscriber phones, and the subscriber specified by EFAddr Service specific information and phone specific information.
[0018]
“Control” indicates instruction information from the LE 1 for the subscriber specified by EFaddr. “Information” includes additional information regarding an instruction indicated by Control and information on a higher level layer. “FCS” is check information for indicating whether or not all the above data are correct. “FLAG” is information indicating the forefront and the back of all the above data.
[0019]
In the present embodiment, in the data format of FIG. 2, data having values such as “EFaddr” and “DLaddr” of “8175” and “Control” of “127” are defined as “reset request data to the remote exchange”, and FIG. As shown in FIG. 4, when the reset request data 10 is transmitted from the LE 1 to the AN 51, the AN 51 has a function of performing an autonomous reset (the same applies to other ANs such as 5m).
[0020]
Then, the system manager 3 on the LE1 side performs the control related to the transmission of the reset request data 10 described above, so that all the ANs 51 and 5m connected to the LE1 can be instructed to reset, and the control is performed. Centralized management. When it is desired to reset a specific AN 51, the above-described reset request data 10 is transmitted from the system manager 3 in the LE 1 to the corresponding AN 51 without going to the installation location of the AN 51. A reset can be realized.
[0021]
Normally, when a message is transmitted from LE1 to AN51, 5m, it is necessary to establish a layer 2 link. However, this reset request data 10 is transmitted even if a layer 2 link is not established. Is possible. The reason is that the message defined as the reset request data is a message transmitted when the layer 2 link “SABME” having a control value “127” is established, and this message indicates whether or not the link has been established. This is because transmission to AN 51 and 5 m is possible regardless of
[0022]
Therefore, according to the present embodiment, the reset request data 10 can be transmitted even if the layer 2 link is not established, and the reset request data 10 is independent from each other for all the ANs connected to the LE 1. The reset request data with the same message content can be sent in parallel, and the reset request data itself has a small data length, and there is almost no delay to each AN without congestion in the exchange. In this case, it is possible to immediately reset a plurality of ANs.
[0023]
The present invention is not limited to the above embodiment. In the above embodiment, the message “SABME” is defined as the reset request data. However, when the link is established, a specific LAPV5 is specified. It is also possible to determine and transmit a message as reset request data.
[0024]
【The invention's effect】
As described above, according to the present invention, a specific message on the LAP V5 protocol is determined as reset request data and transmitted to the remote exchange, and the remote exchange performs a reset operation when receiving this specific message. As a result, the remote switch can be reset under the control of the host switch without requiring maintenance personnel to go to the location of the remote switch, so the remote switch is immediately reset when a reset is necessary. It is also possible to eliminate the expense of going to the installation site of the remote exchange to be reset by maintenance personnel.
[0025]
Further, according to the present invention, a plurality of remote exchanges can be simultaneously reset by outputting the same specific message as reset request data in parallel independently of each other, and a layer 2 link is established. Even if not, the reset request data is transmitted from the host-side exchange, and the remote-side exchange that needs to be reset can be immediately reset with almost no delay.
[Brief description of the drawings]
FIG. 1 is a block diagram of an embodiment of a system of the present invention.
FIG. 2 is a diagram showing an example of a data format transmitted in the embodiment of FIG.
FIG. 3 is a diagram showing a data format defined as reset request data in the embodiment of FIG. 1;
[Explanation of symbols]
1 Host exchange (LE)
21-2n Terminating device for V5-related message 3 System manager 4 Communication path switch 51, 5m Remote side switch (AN)
61-6j, 71-7k Subscriber telephone 10 Reset request data

Claims (4)

A specific message sent when establishing a layer 2 link on the LAP V5 protocol to a remote exchange that needs to be reset among one or more remote exchanges to which the host exchange is connected via a V5 interface A first step of determining and transmitting as reset request data;
And a second step in which the remote exchange receiving the reset request data autonomously performs a reset operation. In the first step, when there are a plurality of remote side exchanges that need to be reset, the reset request is sent to the plurality of remote side exchanges that need to be reset with the specific message having the same content. as the data, according to claim 1 resetting the remote side switch of, wherein the output at the same time. A single host-side switch and one or more remote-side switches connected by a V5 interface corresponding to one or more terminal devices of V5-related messages in the host-side switch. Each exchange is an exchange system that accommodates one or more subscriber phones.
The host-side switch uses, as reset request data, a specific message transmitted when establishing a layer 2 link on the LAP V5 protocol to a remote-side switch that needs to be reset among the one or more remote-side switches. An exchange system comprising: a transmission means for determining and transmitting through the terminal device, wherein the remote exchange includes a reset means for autonomously resetting when the specific message is received. When there are a plurality of remote exchanges that need to be reset, the transmission means sends the specific message having the same content to the reset request data to a plurality of remote exchanges that need to be reset. and a, switching system according to claim 3, wherein the simultaneously transmitted.

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