JPH03276994A - Isdn exchange system - Google Patents

Abstract

PURPOSE:To enable efficient control with the less amount of a protocol control means by limiting an interface part to only the function of layer 1 and controlling protocols higher than a layer 2 by the protocol control means. CONSTITUTION:By the information obtained from an ISDN control part 9, a main control part 7 sends an ISDN signal through the control part 9 to internal-interface parts 13 and 14, and performs the entire exchange control of a time division exchange switch 18 or the like for line connection. The interface parts 13 and 14 are only provided with a signal generation detecting function for data link and a separating/multiplexing function of an information channel and a control channel, and the processing functions of layers 2 and 3 are omitted. Thus, the interfaces 13 and 14 can be considerably simplified, and the complicated and expensive part can be held as the internal resources of a private branch exchange.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ISDN switching system in an ISDN line.

[Prior Art] Recently, there have been an increasing number of private branch exchanges that can accommodate ISDN extensions on the extension side as well. ISDN service is
Although advanced services are available for voice and data systems, the interface section is more complex than existing networks, and the amount of hardware and software for network control is large, complex, and expensive. .

In a private branch exchange connected to a conventional ISDN, CCITT Recommendation 1.430. Q, 92
1. It was equivalent to Q931 and had a configuration that had the function of controlling layers 1 to 3.

FIG. 3 shows the configuration of a private branch exchange connected to this conventional ISDN.

In the figure, 1 and 2 are terminals connected to ISDN extension, 3 and 4
is an extension interface unit that controls the interface with the terminals 1 and 2, and separates/multiplexes the ISDN information channel (B channel) and control channel (D channel), and performs various controls using the control channel. Reference numeral 5 denotes an ISDN office line interface section, which has the same functions as the extension line interface sections 3 and 4. 6 is ISDN100
7 is a main control unit (CC) that controls the overall control; 8 is a time-division exchange within the exchange that connects the information channels from each interface unit 3 to 5 to a desired interface unit in a time-division manner; switch, 100 is ISD
It is N.

The conventional ISDN extension interface unit 3.4 has a hardware configuration and software configuration for controlling all control channels from layer 1 to layer 3.

[Problems to be Solved by the Invention] However, in a private branch exchange, there is generally a very small possibility that all extensions are used at the same time, and considering the traffic volume of ISDN extensions, all interfaces require the complicated and expensive layer 1 to Having control functions up to layer 3 was not efficient (and not desirable).

[Means for Solving the Problems] The present invention has been made for the purpose of solving the above problems, and includes the following configuration as one means for solving the above problems.

That is, an interface unit that controls the interface with the ISDN line for each ISDN line, a protocol control unit that controls the ISDN protocol, and the protocol control unit and the interface unit are connected to an ISDN exchange that accommodates a plurality of ISDN lines. and a time division switch.

[Operation] In the above configuration, the interface section is limited to only layer 1 functions, and the protocol control means controls protocols of layers 2 and higher.

Then, only the layer 1 functions that are essential for recognizing outgoing calls are prepared for each ISDN line interface, and the layer 2 functions are prepared for each ISDN line interface.
By controlling the above functions by the protocol control means, the number of the protocol control means can be reduced, and efficient control can be achieved.

[Example] Hereinafter, an example according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a private branch exchange that accommodates an ISDN line according to an embodiment of the present invention.

In FIG. 1, the major difference from the conventional one shown in FIG. 3 is that in this embodiment, the extension interface section 13.1
Layer l where 4 is the physical level required for the interface
It is configured to have only the functions of Leia 2 and Leia 3.
This process is performed by an ISDN control section 9 provided separately in the exchange. Note that the same components as in FIG. 3 are given the same numbers, and detailed explanations are omitted.

In FIG. 1, 9 is an extension interface section 13.14.
Instead, the ISDN control unit processes layer 2 and layer 3 of the control information from the interface units 13 and 14, and 13.14 is an extension interface unit that controls the interface with the terminals 1 and 2 described above, and at the physical level. It has only layer 1 functions, and is configured to perform separation/multiplexing of ISDN information channels and control channels. Note that although only two terminals are illustrated in this embodiment, the number of connected terminals is not limited to the above example (it can be any number).

In addition, 18 is not only the ISDN information channel (B channel) between each interface unit, but also the control channel (D channel) from the extension interface unit 13.14 and the ISDN information channel (B channel).
It is also a time-division conversion switch that connects to the DN control unit 9 in a time-division manner.

In the above configuration, the main control unit 7 sends an ISDN control signal via the ISDN control unit 9 according to the information obtained by the ISDN control unit 9, and the main control unit 7 sends an ISDN control signal to the extension interface unit 1.
Send on 3.14. It also controls all switching of the time division switching switch 8 and the like for line connection.

With the above configuration of this embodiment, the extension interface units 13 and 14 only have a data link signal generation detection function (INFOO to INFO4) and an information channel and control channel separation/multiplexing function. Layer 2.1 functions as a control function for control information, which complicates the configuration of the interface units 13 and 14. The processing function of layer 3 can be omitted. Therefore, the extension interface sections 13, 14 can be significantly simplified, and complicated and expensive parts can be used as internal resources of the private branch exchange. Furthermore, it is possible to select the number of channels that can be used simultaneously according to the traffic at the local exchange.

Therefore, the number of channels can be reduced compared to the case where each extension interface streetcar is provided with the same number of channels as the number of interfaces, without reducing the function and efficiency of the exchange. Particularly remarkable effects can be obtained in exchanges that have a large number of extension lines and are connected to a large number of terminals. Note that 10 in the figure is a signal line for transmitting the layer 1 status of the extension interface section 13.14.

As explained above, according to this embodiment, the control information control function of the extension interface section is omitted, and the entire exchange is provided with the necessary number of processing channels, thereby making the control information processing function efficient and wasteful. (and the necessary number can be provided.

[Other Embodiments] In the above explanation, only the extension interface units 13 and 14 have the function of layer 1, which is the physical level necessary for the interface, and the processing of layers 2 and 3 is provided separately in the exchange. Although we have described an example of a configuration in which the ISDN control unit 9 performs this function, the central office line interface unit 15 is similarly configured to have only the layer 1 function, which is the physical level necessary for the interface, and has the layer 2 and layer 3 functions. The processing may be performed by an ISDN control section 9 provided separately in the exchange. With this configuration, even more efficient exchange processing can be performed.

FIG. 2 shows the configuration of a second embodiment according to the present invention.

In FIG. 2, the same components as in FIG. 3 and FIG. 1 are given the same reference numerals, and detailed explanations are omitted. The main difference from FIG. 1 is that the ISDN office line interface unit 15 also has only the layer 1 function at the physical level, similar to the extension interface units 13 and 14, and also has the function of separating/separating ISDN information channels and control channels. The structure is configured to perform multiplexing.

The time division conversion switch 18 can switch and connect not only the ISDN information channel (B channel) but also the control channel (D channel) from the extension line interface units 13 and 14 and the office line interface unit 15 in a time division manner. be.

At this time, the protocol on the ISDN control information office line side is
Unlike the extension side protocol, it is necessary to switch between the two to support them.

With the above configuration and control, the control function of the control information of the extension interface units 13, 14 and the central office line interface unit 15 is omitted, and by providing the necessary number of processing channels for the entire exchange, the processing of control information is performed. It is possible to provide the necessary number of functions efficiently and without waste.

Furthermore, as explained above, according to this embodiment, ISDN
It is possible to easily change the extension line or office line.

Furthermore, for D channel packet communication serviced by ISDN, if ISDN extension/office line interfaces 13 to 15 are conventional control signal bus communication, inter-CPU communication between each interface is required. However, by consolidating the control information processing functions in one place as in this embodiment, there is no need to communicate control information between each (it is possible to easily configure the role of the packet handler). becomes.

In addition, in the above explanation, resources include the ISDN extension line control signal control unit and the ISDN central office line control signal control unit, but each may be configured separately, or multiple units may be provided. It is clear that there is a similar effect.

As explained above, according to this embodiment, the control function of the control information of the interface section is omitted and the entire exchange is provided with the required number of processing channels, thereby efficiently performing the control information processing function and eliminating unnecessary ( , and the required number can be provided.

[Effects of the Invention] As explained above, according to the present invention, the interface section is limited to layer 1 functions only, and the protocol control means controls protocols of layer 2 and above, so that the amount of the protocol control means is reduced. As a result, efficient control becomes possible.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the concept of an embodiment according to the present invention, FIG. 2 is a block diagram showing the concept of a second embodiment according to the present invention, and FIG. 3 is a block diagram showing the concept of a second embodiment according to the present invention. It is a block diagram. In the figure, 1.2... terminal, 3-5, 13-15... interface section, 6... ISDN line, 7... main control section, 8, 18.28... time division switch ,9...
ISDN control unit 100... ISDN. 100 +00

Claims (2)

[Claims] (1) An ISDN exchange that accommodates a plurality of ISDN lines includes an interface unit that controls an interface with the ISDN line for each ISDN line, a protocol control unit that controls the ISDN protocol, and the protocol control unit and the interface unit. 1. An ISDN switching system, comprising: a time division switch for connection; the interface section is limited to only layer 1 functions; and the protocol control means controls protocols at layers 2 and above. (2) I according to claim 1, characterized in that the protocol control means also has an information channel packet switching function.
SDN exchange method.