JPH06189006A - Private branch exchange connecting system for integrated service digital network - Google Patents

Abstract

PURPOSE:To install primary group velocity interfaces more than a limited number between a private branch exchange and an exchange even when the number of primary group velocity interfaces to be controlled by a primary group velocity interface controller is limited. CONSTITUTION:Primary group velocity interfaces 30-33, 40-43 and 50-53 more than the limited number are divided and housed in plural primary group velocity interface controllers 3-5, when a call is terminated to a private branch exchange 2, an exchange 1 finds out any idle channel among usable channels 3n-5n and when a call is originated from the private branch exchange 2, the private branch exchange 2 finds out any idle B channels among the primary group velocity interfaces 30-33, 40-43 and 50-53 and sets the channel of the call of the private branch exchange 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for connecting an ISDN (Integrated Services Digital Network) private branch exchange and an ISDN exchange via a primary rate interface. In particular, when the primary group speed interface control device of the ISDN exchange has a limit on the number of controllable primary group speed interfaces, and this limits the number of primary group speed interfaces, a large capacity private branch exchange is connected. It is used for the method.

[0002]

2. Description of the Related Art Conventionally, in a private branch exchange connection system of an ISDN network, a switching device has a single primary group speed interface controller having a limit to the number of primary group speed interfaces that can be installed between the private branch exchange and An exchange and a private branch exchange are connected by a plurality of primary group speed interfaces in a range that can be controlled by the primary group speed interface control device,
The call path of all calls of the private branch exchange has been set to one of a plurality of primary group speed interfaces that can be controlled by the primary group speed interface control device.

Further, the flag and the bit error of the layer 2 in the call processing signals on a plurality of digital subscriber lines are detected,
The number of a digital subscriber line corresponding to each call processing signal is added to each of the plurality of call processing signals, the signals are multiplexed and transmitted, and the signals on the PCM transmission path are deciphered and separated to obtain the call processing signal. By detecting the flag of the layer 2 and bit error detection, the band containing the call processing signal on the primary group or higher order PCM transmission line is less than the sum of the bands containing the call processing signal on the digital subscriber line to be multiplexed. There is a method to make it in (Japanese Patent Laid-Open No. 120995/1989)
Issue).

[0004]

However, in such a conventional private branch exchange connection method of the ISDN network, all outgoing calls and incoming calls of the private branch exchange have a single primary group speed of the exchange. Since the interface controller is always set to one of the multiple primary group speed interfaces within the controllable range, the number of primary group speed interfaces that can be installed between the exchange and the private branch exchange is limited. There was a problem.

Further, the method of reducing the band including the call processing signal on the primary rate interface cannot accommodate a large capacity private branch exchange, and has a problem that only the band of the call processing signal can be reduced.

The present invention has been made against such a background, and even if there is a limit to the number of primary group speed interfaces that can be controlled by the primary group speed interface control device of the switching device, a plurality of primary group speed interfaces exceeding the limited number can be used. It is an object of the present invention to provide a private branch exchange connection system of an ISDN network in which a primary rate interface can be installed between the exchange and the private branch exchange.

[0007]

SUMMARY OF THE INVENTION The present invention comprises a private branch exchange and a switching device connected to the private branch exchange via a primary group speed interface, the switching device comprising a controllable number of primary group speed interfaces. A primary group speed interface control device having a limit number and an exchange connected to the primary group speed interface control device through a usable channel group, the primary group speed interface and the usable channel group being the limited number. In a private branch exchange connection system of a service integrated digital network provided with a number corresponding to the number, the primary group speed interface control device divides and accommodates a number of primary group speed interfaces and usable channel groups exceeding the limit number. A plurality of exchanges are provided, and the exchange is used in the case of an incoming call to the private branch exchange. Means for detecting whether or not there is a free channel on the active channel group, and based on the detection result of this detecting means, activates the primary group speed interface control device corresponding to the available channel group where the free channel exists, Means for instructing the setting and setting the empty channel as a speech path, the private branch exchange detecting means for detecting whether or not there is an empty B channel on the primary speed interface in the case of the outgoing call. Based on the detection result of the detecting means, means for activating the primary group speed interface control device corresponding to the primary group speed interface in which an empty B channel exists, instructing call setting, and setting this empty B channel in the communication path is included. , The primary group velocity interface control device, when activated by the exchange, respectively. Means for finding an empty B channel on the network and setting the empty B channel on the communication path with the private branch exchange; and, when activated by the private branch exchange, finding an empty channel on the subordinate usable channel, It is characterized by including means for setting the idle channel to a communication path with the exchange.

[0008]

In the case of an incoming call to the private branch exchange, the exchange finds an empty channel on the available channel group exceeding the limit number and responds to this empty channel among the plurality of primary group speed interface controllers. In the case of an outgoing call from the private branch exchange, one of them is activated to instruct call setting, and an empty B channel on the primary group speed interface provided exceeding the limit number is found, and a plurality of primary group speed interface control devices are found. The primary group speed interface controller that activates one of the primary group speed interfaces in which the empty B channel exists to instruct call setup,
By finding an empty B channel on the primary group speed interface under control or an empty channel on the usable channel group and setting a call path between the private branch exchange and the exchange, the primary group speed interface control device of the exchange device Even if the number of controllable primary speed interfaces is limited, a number of primary speed interfaces exceeding the limited number can be installed between the private branch exchange and the exchange.

[0009]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a private branch exchange connection system of an integrated service digital network according to an embodiment of the present invention.

Referring to FIG. 1, the private branch exchange connection system of the integrated service digital network comprises a private branch exchange 2 and a private branch exchange 2 which is connected to the private branch exchange 2 through a primary rate interface. A primary group speed interface controller having a limit on the number of possible primary group speed interfaces; and an exchange 1 connected to the primary group speed interface controller via a usable channel group. The available channel group is provided in a number corresponding to the limited number.

A feature of the present invention is that the primary group velocity interface control device has a number of primary group velocity interfaces (PRI) 30 to 3 which exceeds the limit number.
3, 40 to 43, 50 to 53 and a plurality of usable channel groups 3n to 5n (primary group speed interface control devices 3 to 5) are provided so as to be accommodated in a divided manner.
Channel groups 3 that can be used for incoming calls to the private branch exchange 2
means for detecting whether or not there is a vacant channel on n to 5n, and based on the detection result of this detecting means, activates the primary group speed interface control device corresponding to the usable channel group in which the vacant channel exists, The private branch exchange 2 includes means for instructing setting and setting this empty channel to the communication path, and in the case of the outgoing call, the empty B channel is present on the primary group speed interfaces 30 to 33, 40 to 43, 50 to 53. Based on the detection result of the presence / absence, and the detection result of the detection means, the primary group speed interface control unit corresponding to the primary group speed interface in which an empty B channel exists is activated to instruct the call setting and the empty B Each of the primary group speed interface control devices 3 to 5 includes means for setting a channel to a communication path, and is controlled by the exchange 1 when activated. Means for finding an empty B channel on the primary group speed interface and setting this empty B channel on the speech path to the private branch exchange 2, and, when activated by the private branch exchange 2, an empty channel on the subordinate usable channel And to set this idle channel to the communication path with the exchange 1.

The operation of the private branch exchange connection system of the integrated service digital network having such a configuration will be described.

FIG. 2 is a flow chart showing the processing in the case of an incoming call to the private branch exchange of the private branch exchange connection system of the integrated service digital network of the present invention. In FIG. 2, the exchange 1 sequentially checks whether or not there is a vacant channel in the usable channel groups 3n to 5n, activates the primary group speed interface control device corresponding to the usable channel group in which the vacant channel exists, and calls. At the same time as instructing the setting, the idle channel of the found usable channel group is closed and the channel is used to set the communication path for the call between the exchange 1 and the corresponding primary group speed interface control device. To do.

If the idle channel does not exist in any of the usable channel groups 3n to 5n, the exchange 1 gives up the call setup.

FIG. 3 is a flow chart showing the processing of the primary group speed interface controller of the private branch exchange connection system of the ISDN network of the present invention. Here, it is assumed that the primary velocity interface controller 4 is activated. The primary speed interface controller 4 finds an empty B channel existing in any one of the primary speed interfaces 40 to 43 under the primary speed interface, and uses the B channel for a call with the private branch exchange 2. Applicable B at the same time as setting the call path
The channel is closed.

Next, the operation for setting the communication path of the outgoing call of the private branch exchange 2 between the private branch exchange 2 and the private branch exchange 2 will be described.

FIG. 4 is a flowchart showing the processing of the private branch exchange in the case of an outgoing call of the private branch exchange connection system of the ISDN network. In FIG. 4, the private branch exchange 2 sequentially checks whether or not there is an empty channel in the primary group speed interfaces 30 to 33, 40 to 43, and 50 to 53, and the primary group speed interface corresponding to the primary group speed interface in which the empty channel exists. At the same time as activating the group speed interface control device and instructing the call setting, the empty B channel of the found primary group speed interface is closed, and the corresponding B channel is used to correspond to the private branch exchange 2 and the primary group speed interface control device. Set up a call path for calls between and.

If there is no free B channel in any of the primary group speed interfaces 30 to 33, 40 to 43, 50 to 53, the ISDN private branch exchange 2 gives up the call setup.

FIG. 5 is a flow chart showing the processing of the primary group speed interface control device of the private branch exchange connection system of the integrated service digital network of the present invention. Here, it is assumed that the primary group velocity interface controller 5 is activated. The primary-group speed interface controller 5 finds an empty channel in the usable channel group 5n with the exchange 1, sets a call channel with the exchange 1 using the channel, and simultaneously closes the channel. And

The B channel of the primary group speed interface and the channels of the usable channel group which are blocked for the setting of the call path of the outgoing call or the incoming call of the private branch exchange 2 are the exchange 1, Private branch exchange 2,
Alternatively, it is returned to the idle state again by any of the primary group velocity interface control devices 3-5.

[0022]

As described above, according to the present invention, even if the number of primary group speed interfaces that can be controlled by the primary group speed interface control device of the switching device is limited, the number of primary groups exceeding the limit number is limited. The advantage is that a speed interface can be installed between private branch exchanges.

[Brief description of drawings]

FIG. 1 is a block diagram of a private branch exchange connection system of an integrated service digital network according to an embodiment of the present invention.

FIG. 2 is a flowchart showing the processing of the primary rate interface control device in the case of an incoming call to the private branch exchange of the private branch exchange connection system of the integrated service digital network of the present invention.

FIG. 3 is a flowchart showing the processing of the primary rate interface control device in the case of an incoming call to the private branch exchange of the private branch exchange connection system of the integrated service digital network of the present invention.

FIG. 4 is a flowchart showing the processing of the private branch exchange in the case of an outgoing call of the private branch exchange of the private branch exchange connection system of the integrated service digital network of the present invention.

FIG. 5 is a flowchart showing the processing of the primary rate interface control device in the case of an outgoing call of a private branch exchange of the private branch exchange connection system of the integrated service digital network of the present invention.

[Explanation of symbols]

1 (ISDN) exchange 2 (ISDN) private branch exchange 3-5 Primary group speed interface controller 3n-5n Available channel group 10 (ISDN) exchange 30-33, 40-43, 50-53 Primary group speed interface (PRI) )

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H04Q 11/04

Claims (1)

[Claims] 1. A private branch exchange and a switching device connected to the private branch exchange via a primary group speed interface, wherein the switching device has a primary group speed having a limited number of controllable primary group speed interfaces. An interface control device and an exchange connected to the primary group speed interface control device via a usable channel group, the primary group speed interface and the usable channel group are provided in a number corresponding to the limited number. In a private branch exchange connection system for a comprehensive service digital network, a plurality of the primary group speed interface control devices are provided so as to divide and accommodate a number of primary group speed interfaces and usable channel groups that exceed the limit number. , When an incoming call to the private branch exchange A channel for detecting whether or not there is a channel, and based on the detection result of this detecting means, activates the primary group speed interface control device corresponding to the available channel group in which an empty channel exists, instructing the call setting Means for setting a channel to a speech path, the private branch exchange detecting whether or not there is an empty B channel on the primary rate interface in the case of the outgoing call, and detecting this detecting means. The primary group speed interface, including means for starting a primary group speed interface controller corresponding to the primary group speed interface having an empty B channel based on the result, instructing call setting, and setting the empty B channel to a communication path. Each of the control devices, when activated by the exchange, operates on an empty B channel on the subordinate primary rate interface. A means for finding and setting this empty B channel in the communication path with the private branch exchange, and, when activated by the private branch exchange, finding an empty channel on the subordinate usable channel, and setting this empty channel as the exchange. A private branch exchange connection system for integrated services digital networks, characterized in that it includes means for setting up the communication path.