JPH04276975A - Inter-office link number control system - Google Patents

Abstract

PURPOSE:To realize the economical system in which the service performance to the user using a private branch of exchange is in use and the charge of utilizing an ISDN communication network is expected for saving. CONSTITUTION:A service execution section 16 provided to a central processing unit 14 of a private branch of exchange 1 having an I interface in the ISDN connects an information link via an ISDN communication network 15 with an opposite private branch of exchange 2 to implement the service by the common line signal system on the information link. A traffic measurement section 17 measures the traffic of the service by the common line signal system and stores it. A link number control section 18 controls increase/decrease of an information link number with the private branch of exchange 2 based on the traffic measured by the traffic measurement section 17.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is directed to ISDN (Integ
rated Services Digital
The present invention relates to a method for controlling the number of inter-office links for setting the number of inter-office links between private branch exchanges having I interfaces in an integrated service digital network (Integrated Service Digital Network).

0002

[Prior Art] Conventionally, ISDN was used between opposing private branch exchanges.
When providing services using the common line signaling system via a communication network, a fixed number of links is determined in advance regardless of the traffic volume when setting up information links between opposing private branch exchanges, and the number of links between opposing private branch exchanges is determined in advance depending on the time of day. Links were set up and removed between the two.

0003

[Problems to be Solved by the Invention] As mentioned above, in the conventional inter-office link number control system, the number of information links between opposing private branch exchanges is constant, so the probability that an information link will be busy during high load is low. However, when the load is low, there is a high probability that an information link will become vacant, resulting in poor link usage efficiency.

0004

[Means for Solving the Problems] The interoffice link number control system of the present invention provides for information transmission between a private branch exchange having an I interface, which is a user/network interface in ISDN, and an opposing private branch exchange via the ISDN. means for connecting a link and providing a service based on the common channel signaling method on this information link; a means for measuring and accumulating the traffic amount of the service based on the common channel signaling method between the opposing private branch exchanges; and means for controlling the number of information links between the opposing private branch exchanges based on the number of information links.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a diagram showing the configuration of a private branch exchange system according to an embodiment of the present invention, in which a private branch exchange 1 accommodating an extension telephone 10 connects an extension telephone 20 via an ISDN communication network 15.
A case is shown in which the device is connected to a private branch exchange 20 accommodating. As shown in FIG. 1, private branch exchanges 1 and 2 have the same configuration, and here, the configuration of private branch exchange 1 will be explained as an example. The private branch exchange 1 includes a time division switch 11 that forms a communication path, a primary group interface trunk circuit 12 that is accommodated in the time division switch 11 and interfaces with the opposing private branch exchange 2 via the ISDN communication network 15, and a LAP.
- A D channel control circuit 13 having a D procedure and a central processing unit 4 are provided. The central processing unit 14 includes a service execution unit 16 that connects an information link with the opposing private branch exchange 2 via the ISDN communication network 15 and provides a service using the common line signaling method on this information link; a traffic measurement unit 17 that measures and accumulates the traffic amount of the service using the common line signaling system between the private branch exchange 2 and the private branch exchange 2 based on the measured traffic amount; has.

The operation will be explained below. The primary group interface trunk circuit 12 transmits and receives layer 3 call control information to and from the central processing unit 14 that controls the time division switch 11 via the D channel control circuit 13 . First, the service execution units 16 and 26 of the central processing units 14 and 24, respectively.
connects each channel of the primary group interface trunk circuits 12 and 22 to the ISDN communication network 15, and uses the channels to provide service between the extension telephones 10 and 20 based on the common line signaling system.

Traffic measurement section 17 of central processing unit 14
measures and accumulates the aforementioned channel usage rate and call loss rate by the common line signaling service every minute. and,
When the link number control unit 18 detects that a predetermined call loss rate has been exceeded for a certain period of time, for example, 10 minutes, it determines that there are insufficient information links and sends a call setup message to the ISDN communication network 15. , the number of links between the primary group interface trunk circuit 22 is increased.

On the other hand, when the link number control unit 18 detects that the usage rate of the channel is lower than a predetermined channel usage rate for a certain period of time, for example, 10 minutes, it determines that there are many information links, and the ISDN communication A disconnection message is sent to the network 15 to reduce the number of links with the primary group interface trunk circuit 22.

[0010] With the above-described system, it is possible to dynamically control channels used for services based on the common line signaling system.

[0011]

[Effects of the Invention] As explained above, the present invention improves serviceability for users by controlling the number of information links to be used to dynamically increase or decrease according to the amount of traffic between private branch exchanges. Moreover, it has the effect that it is possible to construct an economical system that can be expected to save on charges for using the ISDN communication network.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a private branch exchange system according to an embodiment of the present invention.

[Explanation of symbols]

10, 20 Extension telephone 11, 21 Time division switch 12, 22 Primary group interface trunk circuit 13, 23 D channel control circuit 14, 24
Central processing unit 15 ISDN communication network 16, 26 Service execution unit 17, 27 Traffic measurement unit 18, 28 Link number control unit

Claims (1)

[Claims] [Claim 1] A private branch exchange having an I interface which is a user/network interface in ISDN,
A means for connecting an information link between the opposing private branch exchanges via ISDN and providing a service based on the common channel signaling method on the information link, and a means for providing service traffic using the common channel signaling method between the opposing private branch exchanges. A method for controlling the number of links between offices, comprising means for measuring and accumulating the amount of traffic, and means for controlling the number of information links between the opposing private branch exchanges based on the measured amount of traffic.