JPH0752989B2 - Module type exchange - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital exchange configured by using a time division speech path device, and more specifically, a modular exchange configured as a combination of functional modules. It is about.

[Conventional technology]

Most of the conventional exchanges are for analog telephone services, and the economical and optimization of the system has been a goal at the time of development. In addition, since the cost of hardware is large, system development has been promoted in the direction of maximizing the utilization rate of hardware by software and reducing the memory capacity of software as much as possible. That is, the communication path device,
Hardware such as signaling devices has been installed in one place as a common device as much as possible, and services have been realized by changing the connection of common devices with software.

In recent years, digital exchanges have been developed, and ISDN (Digital Integrated Service Network) plans for digitizing even subscriber lines are being promoted in various countries.

[Problems to be solved by the invention]

Along with this, it has become necessary for the subscriber line exchange to support various services such as providing various data services other than telephone calls and covering a wide speed range from low speed calls to high speed calls. For this reason, in the conventional system configuration of the exchange, if it is attempted to cope with the necessity, additional changes become complicated both in terms of hardware and software, and a great deal of cost is required for development and maintenance of the system. .

An object of the present invention is to configure a switchboard by dividing it into a number of independent modules, and connect each functional module using the same high-performance control procedure as the inter-station communication control, thereby making it possible to realize a hardware configuration. Another object of the present invention is to provide a modular exchange as an exchange system that can be easily added and changed in terms of software.

[Means for solving problems]

To achieve the above object, the exchange according to the present invention comprises a subscriber line interface device for accommodating a subscriber line, a subscriber line signal device for transmitting and receiving a subscriber line signal, and a call from the subscriber or a call to the subscriber. A subscriber switching module composed of a time-division communication path device that accommodates a call and a processing device that controls these devices, a trunk line interface device that houses a trunk line, and transmission / reception of trunk line signals A distribution and exchange module that consists of a trunk signal device, a time-division channel device that accommodates relay calls, and a processing device that controls these devices, a test device, and a switch that switches connections between them. Of the above-mentioned communication channel device and a processing device for controlling these various devices, and a digital interface for connecting between the communication channel devices in each module. Interface device and an inter-module interface device that connects between the processing devices in each module in a loop or bus configuration and performs inter-module communication control according to a predetermined control procedure, and the distribution exchange module comprises: It is composed of a plurality of types of distribution switching modules provided for speed groups, and the speech path device included in the subscriber switching module can accommodate each call belonging to a plurality of different signaling systems or each call belonging to a plurality of speed classes. The time-division communication path configuration is adopted, and the communication lines are divided and connected to the distribution exchange modules provided in plural types corresponding to speed groups according to the traffic classified by speed groups.

[Action]

The control signals between the respective modules are exchanged via the inter-module interface device connected by a loop or a bus, and the inter-module communication control is the same as the inter-station communication control.
It is performed according to a highly functional control procedure such as HDLC (High Level Data Link Control Procedure). This is different from the conventional exchange system of the present invention in that a subscriber exchange module, a distribution exchange module, and a monitoring test module, which are independent function modules, are combined to construct one exchange system.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. Before that, with reference to FIG. 1, a basic modular form that is a prerequisite for understanding the embodiment of the present invention. The exchange will be explained. In FIG. 1, 1 is a subscriber exchange module (SSM), 3 is a distribution exchange module (DSM), and 5 is a supervisory test module (STM). These modules form one exchange. 6 is an inter-module interface device (MIC), 71 is a subscriber line, 81 is a digital relay line, 82 is an analog relay line, 91 is an inter-station common signal line, 11, 31, 51 are processing devices, 12, 32, 52 is a speech path switch, 13 is a speech path rear type subscriber line signal device,
14 is a voice path front-end type subscriber line signal device, 15 is a subscriber line interface device, 53 is a test device, 33 is an individual line signal type relay signal device, 34 is a relay line interface device, and 35 is a common line signal type relay. A signaling device.

A plurality of subscriber exchange modules (SSM) 1 are prepared and connected according to the size of the station. Subscriber Exchange Module (SS
Between M) 1 and distribution switching module (DSM) 3 and subscriber switching module (SSM) 1, distribution switching module (DSM)
3 and the monitoring test module (STM) 5 are connected by a standard digital interface between the communication path switches, and a loop or a bus is provided between the processing devices (11, 31, 51) of each module. Are connected by an inter-module interface device (MIC) 6 composed of. The subscriber exchange module (SSM) 1 and the monitoring test module (STM) 5 may be connected directly or indirectly via a distribution exchange module (DSM) 3. The inter-module communication control performed via the inter-module interface device (MIC) 6 is
It is executed according to a high-performance control procedure such as HDLC (high-level data link control), which is the same as the case of communication control of common line signals between stations. The subscriber switching module (SSM) 1 performs originating / terminating connection processing depending on the subscriber line interface, intra-station connection processing, and distribution processing when a plurality of distribution switching modules (DSM) 3 are installed. The distribution switching module (DSM) 3 performs input / output connection processing and distribution processing depending on the relay interface, and supports any combination of analog line / digital line, individual signal line / common line signal line relay line.

Next, the operation will be described.

When a subscriber accommodated in the subscriber switching module (SSM) 1 makes a call via the subscriber line 71, the subscriber line interface device 15 detects the call and uses the subscriber line signaling device 13 or 14 to perform DT (dial). Sends tones and receives selected numbers (dial numbers). The processing device 11 translates the selected digits, and if the called party is a subscriber in the same subscriber exchange module (SSM) 1, the subscriber exchange module (SS
M) Incoming calls are processed in a closed form. When the call destination is a subscriber of a module other than the same module, the processing device 11 performs outgoing connection processing. Subscriber Exchange Module (SS
The outgoing line of the M) 1 is accommodated in the distribution switching module (DSM) 3, and the processing device 11 transmits / receives control information to / from the processing device 31 via the inter-module interface device (MIC) 6. This control information depends on the hardware of the inter-module interface device (MIC) 6 for layers 1 and 2, but for layers 3 and above it is between No. 7 stations specified by CCITT (International Telegraph and Telephone Consultative Committee). It can be realized by the same signaling method as the signaling method.

The processing device 31 analyzes the received control information and makes a required relay connection. When the destination is a subscriber of another subscriber switching module (SSM) accommodated in the distribution switching module (DSM) 3, another subscriber switching module (SSM) is sent via the inter-module interface device (MIC) 6. Relay processing is performed with the processing device, and the processing device performs incoming connection processing. When the destination is another exchange, the processing device 31 performs outgoing / incoming connection processing. When the inter-office interface with the partner exchange is a metallic trunk line, the individual line signaling system trunk line signaling device 33, trunk line interface device 34 and metallic trunk line 82 are used to convert the control information to the LP signaling system and relay it. Make a connection.

When the inter-station interface with the partner exchange is an individual signaling digital trunk line, the individual line signaling trunk line signaling device 33 and the digital trunk line 81 are used to convert the control information to the SR signaling system for relay connection. .

When the inter-station interface with the partner exchange is a common line signaling digital trunk line, the common line signaling trunk line signaling device 35 and digital trunk line 81 are used to convert the control information to the common line No. 7 signaling system. And relay connection.

The monitoring test module (STM) 5 is composed of a time division speech path switch 52, a test device 53, and a processing device 51 which function as a connection change switch of the test device 53. When testing the subscriber exchange module (SSM) and distribution exchange module (DSM), the processing unit 51 selects a test unit according to the test item and uses the speech path switch 52 to test the module under test (SSM, DSM). ) And test equipment to collect test information. The control information required for the test is sent to each processing device (11, 31) via the inter-module interface device (MIC) 6.

Subscriber Exchange Module (SSM) and Distribution Exchange Module (D
The SM) has switching functions independently of each other, but has the line interface functions in a decentralized manner. With the combination of (SSM + DSM), LS (local exchange), TLS (outgoing / incoming calls, merged local exchange) are provided. , TS (City Outgoing Call Exchange) can be realized by the distribution exchange module (DSM) alone. Therefore, the trunk line interface device and trunk line signal device (analog trunk, PCM-MUX (PCM terminal station device), individual line signal transmission / reception circuit (SS / SR circuit)) necessary for connection with the existing individual signal system trunk line , Multi-frequency signal transmission / reception circuit (MFS / MFR) can be integrated and installed in distribution switching module (DSM), and it is possible to realize an economical modular switching system with excellent building block properties. Further, since the subscriber switching module (SSM) can easily accommodate the common line signaling digital trunk line by adding the common line signaling trunk line signal device 35, the common line ratio of all trunk lines can be increased. If 100% is achieved, Subscriber Exchange Module (S
The above-mentioned TS and TLS exchanges can be realized by SM alone.

Furthermore, even if the distribution switching module (DSM) fails, the subscriber switching module (SSM) can handle the connection within its own module by the stand-alone function, and a large-scale station that requires multiple LS and TLS systems. Then, each subscriber exchange module (SSM) is replaced by a multiple distribution exchange module (D
It is possible to build a highly reliable exchange system by assigning it to SM).

In addition, the maintenance test function is separated and integrated into a supervisory test module (STM) that is independent of the exchange module, connected to the exchange through a standard digital interface, and control signals such as test instructions are sent via an inter-module interface unit (MIC). It is possible to construct a general-purpose maintenance test system regardless of the hardware configuration of the replacement module by controlling it with a highly functional procedure.

FIG. 2 is a block diagram showing an embodiment of the present invention. In FIG. 2, 2 is a digital subscriber exchange module (SSM2), 4 is a high-speed distribution exchange module (DSM2),
72 is a digital subscriber line, 83 is a high-speed digital relay line, 21 and 41 are processors, 22 is a time-division channel device capable of accommodating calls of a plurality of speed classes, and 42 is a channel switch (channel device) 32. Time-division communication path devices that accommodate calls of different speed groups (for example, high-speed calls), 23 and 24 are digital subscriber signaling devices, 25 is a digital subscriber line interface device, and 26 is a speed conversion device. The speed conversion device 26 may be installed on either the digital subscriber exchange module (SSM2) side or the high speed system distribution exchange module (DSM2) side.

The digital subscriber switching module (SSM2) 2 is a subscriber switching module that supports digital subscriber line signaling (for example, CCITT I interface), and has a plurality of basic access (2B + D) and primary group access (23B + D, 24B). The subscribers having different speed classes are mixedly accommodated, and the communication lines are divided and connected to a plurality of distribution switching modules (DSMs), that is, 3 and 4, according to the traffic by speed group.
(DSM2) 4 is a high-speed distribution switch module so that it can provide multiple services (N × 64 Kb / s calls, and calls with N times speed when 64 Kb / s is a standard speed call). Time-division speech path with time sequence guarantee function within the same frame
42 and common line signaling system trunk line signaling device 45 and processing device 41
Composed of.

As described above, according to the present invention, even when services of a plurality of speed classes are provided, by providing the distribution exchange module separately for the speed groups, particularly in the initial stage where the service demand of the high speed system is small. An economical exchange system can be provided.

Although the digital subscriber exchange module (SSM2) is described in FIG. 2 as accommodating only digital subscribers, it may be mixed with analog and digital.

FIG. 3 is a block diagram showing another embodiment of the present invention.

In FIG. 3, the same parts as those in FIGS. 1 and 2 are designated by the same reference numerals. That is, as shown in FIG. 3, a subscriber switching module (SSM) is a module 1 for analog, a module 2 for digital, or a broadband module such as an image (not shown) depending on a difference in subscriber line signal system. By dividing each module into independent modules, a new signaling service can be added without changing the software or hardware of the existing module.

〔The invention's effect〕

As described above, according to the present invention, the exchange is a subscriber exchange module (SSM), a distribution exchange module (DSM),
The following effects can be expected by configuring the module so that it can be divided into three modules, the monitoring test module (STM).

B) The subscriber switching module (SSM) and distribution switching module (DSM) have switching functions independently of each other, but since they have distributed line interface functions, (SSM + DS
It is possible to realize LS and TLS exchanges by combining M) and TS exchanges by DSM alone.

B) The trunk line interface device and trunk line signaling device required for the existing individual line signaling system trunk line are integrated and installed in one distribution switching module (DSM), and a plurality of subscriber switching modules (SSM) are installed. By sharing, it is possible to integrate the special devices for existing interfaces.

C) Even if the distribution module (DSM) fails,
Each subscriber exchange module (SSM) is capable of connection processing within its own module by the stand-alone function.
For large-scale stations that require multiple S, TLS systems, a highly reliable switching system can be constructed by assigning each subscriber switching module (SSM) to the multiple distribution switching module (DSM).

D) Since the subscriber switching module (SSM) can easily accommodate a common line signaling digital trunk line by adding a common line signaling trunk line signal device, the common line ratio of all trunk lines is 100. If it is achieved, the subscriber exchange module (SSM) alone can realize the TS and TLS exchanges.

E) The maintenance interface function, which was conventionally installed for each switch, is installed in the monitoring test module (STM).
The maintenance interface function can be economically realized by accommodating a plurality of subscriber exchange modules (SSM) and distribution exchange modules (DSM) in one monitoring test module (STM).

In addition, the subscriber exchange module (SSM), distribution exchange module (DSM), and monitoring test module (STM), which are independent functional modules, are combined to construct one exchange system, so that functions can be added or changed in module units. ， Partial integration can be easily realized, and it is possible to construct an exchange that is economical and has excellent building block properties.

[Brief description of drawings]

FIG. 1 is a block diagram showing a basic modular type exchange which is a prerequisite for understanding the embodiment of the present invention, FIG. 2 is a block diagram showing one embodiment of the present invention, and FIG. 3 is the present invention. It is a block diagram which shows the other Example of this. Explanation of symbols 1,2 …… Subscriber exchange module, 3,4 …… Distribution exchange module, 5 …… Monitoring test module, 6 …… Inter-module interface device, 71,72 …… Subscriber line, 81,82, 83 ...
… Relay line, 91 …… Inter-station common signal line, 11,21,31,41,51…
… Processing device, 12,22,32,42,52 …… Time division speech path switch, 13,14,23,24 …… Subscriber line signal device, 15,25 …… Subscriber line interface device, 33 …… Individual line signaling system trunk line signaling device, 34 …… trunk line interface device, 26 …… speed conversion device, 53 …… testing device, 35,45 …… common line signaling system relay line signal device

Claims (1)

[Claims] 1. A subscriber line interface device for accommodating a subscriber line, a subscriber line signal device for transmitting and receiving a subscriber line signal, and a time division call for accommodating a call from a subscriber or a call to a subscriber. A subscriber switching module configured by a line device and a processing device that controls these devices, a trunk line interface device that houses a trunk line, a trunk line signal device that transmits and receives a trunk line signal, and a relay A distribution exchange module that consists of a time-division channel device that accommodates calls, a processing device that controls these devices, a test device, and a channel device that functions as a switch that switches connections between them. A monitoring test module configured by a processing device that controls various devices, a digital interface device that connects communication path devices in each module, and each module. And a module interface device that connects the processing devices in the module in a loop or bus configuration and performs inter-module communication control according to a predetermined control procedure, and the distribution exchange module is provided for speed groups. And a call path device included in the subscriber exchange module is a time division call path structure capable of accommodating calls belonging to a plurality of different signaling systems or calls belonging to a plurality of speed classes. The module type exchange is characterized in that the communication line is dividedly connected to the plurality of distribution exchange modules corresponding to the speed groups according to the speed group-specific traffic.