JPH03218155A - Exchange system in building - Google Patents

Abstract

PURPOSE:To eliminate the need for care for the difference of signal formats entirely by discriminating a type of a signal format and supplying the converted signal format based on the result of discrimination to a center exchange. CONSTITUTION:A signal format discrimination section 13 discriminates the type of a signal format used by a floor exchange 11 to which a caller (subscriber 15) belongs and the type of a signal format used by the floor exchange 11. Moreover, when it is discriminated that the type of the signal format of the caller and the type of a signal format of a called party are coincident, the format is sent to a center exchange 12 and when discriminated to be dissident conversely, the signal format converted into the signal format of an opposite party is sent to the center exchange 12. Thus, the exchange processing by the common line signal system is implemented without caring for the difference of the signal format at all.

Description

[Detailed Description of the Invention] [Summary] The present invention includes a plurality of floor exchanges installed on each floor in a building, and a center exchange that forms a common external line interface for these floor exchanges, When the common line signaling method for performing exchange processing with the floor switching equipment is executed using multiple types of signal formats,
The center exchange determines the type of the calling party's signal format and the called party's signal format, and supplies the signal format converted to the other party's signal format based on the determination result to the center exchange. As a result, exchange processing can be performed using the common line signal system without each floor exchange being aware of differences in signal formats between the floor exchanges.

[Industrial application field]

Multiple floor exchange machines installed on each floor of the building,
A single central exchange constitutes a common external line interface for the plurality of floor exchanges, and performs switching processing based on a common line signaling system between the plurality of floor exchanges; This invention relates to an in-building switching system that uses a mixture of multiple types of signal formats.

The above-mentioned type of in-building switching system has already been proposed by the present applicant, and is a switching system with a so-called distributed installation type structure within a building, which is suitable for application to, for example, intelligent buildings. By the way, conventional in-building switching systems do not have the above-mentioned central switching equipment.
Each floor exchange was individually connected to an outside line, and extension connections could only be made between specific floor exchanges, so it was not an efficient system in terms of hardware.

The present invention describes common line signal processing in the above-mentioned switching system having a distributed installation type structure within a building.

[Conventional technology]

In a conventional in-building switching system, so-called interoffice signals responsible for switching control between floor switchboards generally employ a dial pulse (DP) format or a multifrequency code (MF) format. When such interoffice signals are used, each floor exchange can relatively freely create and use communication processing programs. Therefore, even if various types of floor switchboards coexist in a large intelligent building, for example, an in-building switchboard system can be constructed without worrying too much about the differences in specifications of each floor switchboard.

[Problem to be solved by the invention]

In response to the recent development of ISDN, there is a tendency to perform switching control using a common line signaling system. In this case, the common channel signaling system between exchanges in the public network is the so-called CCT TT No.
The signal format for implementing this common line signaling system is unified into one. However, the floor switching equipment in the building switching system, that is, the PB
Regarding X, there are no restrictions on the signal format required to implement the common line signaling method, but it varies for each PBx manufacturing model. The contents of the signal format include telephone number information of the called party, telephone number information of the calling party, various service information, etc., and are independently developed by each manufacturer and provided to users.

Currently, two
Two methods are being implemented. The first method is to predefine one unified signal format in one in-building switching system, and to conform all the signal formats used in each floor switching equipment to this. On the other hand, the second method is that when floor switching equipment from multiple manufacturers compete in a single building switching system, they publish their signal formats to each other, and each further develops a processing program that can support the other party's signal format. It means incorporating it.

However, all of the above methods have problems.

First of all, according to the first method (unified signal format method), the design of any new floor switchgear installed (or replaced) in the building must be changed to match the unified signal format. be. Furthermore, according to the second method described above (method of incorporating the other party's processing program), when a new floor switch is installed (or replaced) in the building, all other floor switch The problem is that it is necessary to add an additional processing program that can handle the signal format used.

Therefore, in view of the above-mentioned problems, the present invention provides an in-building switching system that allows mutual exchange connections without forcing any design changes to a large number of floor switchboards introduced in the in-building switching system. The purpose is to

[Means to solve the problem]

FIG. 1 is a diagram showing the basic structure of an in-building exchange system based on the present invention. In this figure, 1o is an in-building switching system, 11 is a plurality of floor switchboards installed on each floor of the building, 12 is a common external line interface for the plurality of floor switchboards 11, and 1o is a common external line interface for each floor switchboard 11.
There is a single central exchange that performs switching processing under the common channel signaling system. Further, as a premise of the present invention, in the in-building switching system 10, a plurality of types of signal formats that implement the common line signaling method coexist. In this figure, the signal lines connecting each floor exchange 11 and the center exchange 12 are signal lines for exchange control according to the common line signaling system, and signal lines for information such as voice are omitted.

In this figure, the components that characterize the present invention are a signal format determination section 13 and a signal format setting section 14. Both the signal format determination section 13 and the signal former 7} setting section 14 are connected to the center exchange 12.
It is also a feature of the present invention that the

[For production]

The signal format determination unit 13 is a caller (subscriber 15)
The type of signal format used by the floor exchange 11 to which the called party (subscriber 15) belongs and the type of signal format used by another floor exchange l1 to which the called party (subscriber 15) belongs are determined.

Further, when the signal format setting unit 14 determines that the type of signal format of the calling party and the type of signal format of the called party match, the signal format setting unit 14 determines that the signal format does not match. When this happens, the signal format converted to the signal format of the other party is supplied to the center exchange 12, respectively.

In this way, all signal formats can be captured and processed by the central exchange 12 common to all floor exchanges 11, so common line signals can be exchanged between multiple floor exchanges without worrying about differences in signal formats. It becomes possible to perform exchange processing according to the method.

〔Example〕

FIG. 2 is a diagram showing an embodiment according to the present invention.

Note that portions corresponding to those in FIG. 1 are designated with the same reference numerals. 21 is the floor of the building. Also C
S stands for center station, and FS stands for floor station.

The signal format determination unit 13, which is the key point of the present invention, is implemented by, for example, an existing common line signal central control unit (CC) 41.
and the main memory OAM
1 and a main memory (MM) 42.

The central control device 31 and main storage device 32 are connected to a central exchange (
CS) 12. In addition, the central control device 4
1 and the main memory 42 are connected to the existing common line signaling device (CSEI).
, CSE2) 43.

In this case, a new type display table is created in the main storage device 42. The type display table displays the type of signal format used by the floor network to which each subscriber belongs. For example, type (2) is a signal format provided by manufacturer A, and type (2) is a signal format provided by manufacturer B. By referring to this type display table, the caller's call can be sent to the central controller 41.
, the signal format to be used for that subscriber can be immediately determined. Furthermore, the called party is identified based on the telephone number from the calling party, and the signal format to be used for this called party can be immediately determined.

In accordance with this determination result, the central control unit 41 extracts the corresponding signal type from the newly formed type display table in the corresponding main memory 42, creates a common line signal format for the type, and displays the corresponding signal type. It is set in the main storage device 42 (the common line signaling device is always active). In Figure 2, DT is a bidirectional trunk device, COT is an outside line trunk device, and LS is a local switch exchange.

FIG. 3 is a diagram showing an example of a signal format memory. The signal format memory created for the above-mentioned switch manufacturing type is indicated by reference numeral 44 in the figure, and is newly formed in a part of the main storage device 42. This memory 44 is divided by manufacturer, that is, by signal format,
Furthermore, this division can be expanded. Within each category, CSE
(Common line signal device) It is divided into a signal format recording area for reception and a signal format recording area for CSE transmission.

An example of a communication sequence based on the specific configuration described above will be described in detail below (however, the control line and communication line configurations are assumed to be the corresponding network configurations).

FIG. 4 is a diagram showing an example of a communication sequence, and shows a communication sequence between subscriber a and subscriber b in FIG. In addition, the floor switchboard (FS) is provided by the manufacturer A on the Canadian side.
The third party side is manufactured by Manufacturer B, and the center switch (CS) is manufactured by Manufacturer A.

(1) First, subscriber A dials the telephone number of subscriber B according to the in-building number format.

Manufacturer A's floor switchboard first detects a call from subscriber A, sends a dial tone to subscriber A, and receives a telephone number. Thereafter, the telephone number is analyzed, and if it is determined that the caller is allowed to make a call to the other party, an outgoing route (in this case, a route to the CS) is selected from the analysis result information. Since the outgoing route is a common line, a corresponding signal link route is calculated from the outgoing route information. Next, outgoing signal IAI (address signal with additional information) information is created and transmitted to the signal link route (CS in this case).

(2) The center switch (CS) made by company A refers to the type display table based on the received information, and if it determines that the signal is made by company A, it passes control to signal format setting processing. This processing (level 3) first analyzes the DPC (terminating station number), and if the local station is lost, control is further passed to level 4 processing, which analyzes the called party's telephone number, and determines that the call is not addressed to the local station. Once this has been confirmed, select the exit rate (in this case, if it is CS, the rate up to the participant FS) from the analysis result information. Since the outgoing route is a common line, the corresponding signal link rate is calculated from the outgoing route information. The calculated signal link rate is analyzed, and if it is the same as the manufacturer of the calling party, it is left as is, or if it is a different manufacturer, it is converted to a signal format specific to the manufacturer of the destination party, and then created. Send to signal link route. At this time, the signal format memory 44 is utilized.

(3) After analyzing the received signal information, the floor switching system (FS) manufactured by Company B analyzes the signal information and if it determines that the signal is directed to its own station, it analyzes the status of the subscriber, and if the call is available and can be received, the calling party (in this case, A completion signal ACI (address completion signal with additional information) is created and returned to

Thereafter, a ringing tone is sent to the called party, and an RBT (IJ Nguba Nkutone) signal is sent to the calling party.

(4) The center switching system (CS) made by company A refers to the type display table based on the received information, and if it determines that the signal is made by company B, it passes control to the signal format setting process. The following is the same as the other party's format conversion process except for the output route/sent process in (2) above.

(5) After analyzing the received signal information, the floor switching system (FS) made by company A determines that it is addressed to its own station, and then the signal information is an address completion signal (AC+), so it is in the state of waiting for a response from subscriber b (a (including the subscriber's standby state).

(6) When subscriber b subsequently responds, the normal response signal (
ANI), but after the amputation of the participant, normal amputation (
CLF) signals and recovery completion (RLG) signals are exchanged, but these are also converted into their respective signal formats by the CS exchanges and then sent to the respective exchanges.

〔Effect of the invention〕

As explained above, according to the present invention, an in-building switching system is realized in which there is no need to worry about differences in signal formats of common line signaling systems by allowing communication between floor switching equipment on each floor to go through the central switching equipment. be done.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the principle configuration of an in-building switching system based on the present invention, FIG. 2 is a diagram showing an embodiment according to the present invention, FIG. 3 is a diagram showing an example of a signal format memory, and FIG. 4 is a diagram showing an example of a signal format memory. FIG. 2 is a diagram showing an example of a communication sequence. In the figure, 10... In-building exchange, exchange system, 11... Floor exchange, 12... Center exchange, 13... Signal format determination section, 14... Signal format setting section, 15... Subscriber, 31.41...Central control unit, 32.42...Main storage device, 43...Common line signaling device, 44...Signal format memory. Part 1: A diagram showing the principle configuration of an in-building switching system. Part 2: A diagram showing an example of the present invention. Part 3: A diagram showing an example of a signal format memory.

Claims (1)

[Scope of Claims] 1. A plurality of floor exchangers (11) installed on each floor of a building; and a common external line interface for the plurality of floor exchangers (11), and a communication line for each floor exchanger (11). A single central exchange (12) that performs switching processing based on the common line signaling system, and an in-building exchange with multiple types of signal formats that execute the common line signaling system. In the system, a signal format for determining the type of the signal format used by the floor exchange (11) to which the calling party belongs and the type of the signal format used by another floor exchange (11) to which the called party belongs. When the determining unit (13) determines that the calling party's signal format type and the called party's signal format type match, the determining unit (13) determines that the signal formats do not match. At the time, the signal format converted to the signal format of the other party is sent to the center exchanger (12).
An in-building switching system characterized in that the central switching equipment (12) is equipped with a signal format setting section (14) for supplying signals to the central switching equipment (12).