JPH0117299B2 - - Google Patents

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a switching system comprising a plurality of switching devices and a switching management device connected to a trunk line, and a plurality of terminal devices connected to the switching device. The present invention relates to an improved system.

[Prior art]

Conventionally, this type of switching system includes, in particular, a plurality of switching devices connected to a single closed ring trunk line, a switching management device that allocates the use of a plurality of data channels, and a plurality of switching devices connected to a single closed ring trunk line. A ring local area network consisting of terminal devices is known. This method uses a part of the subscriber number directly as a physical address indicating the housing location of the switching equipment and the terminal equipment within the switching equipment. For this reason, since the subscriber number depends on the physical location of the terminal device, there is a drawback that when making a dial connection, it is necessary to know the physical location of the other party's terminal device in advance.

[Summary of the invention]

This invention was made with the aim of improving the drawbacks of the conventional ones as described above, and it is possible to separate a plurality of switching devices connected to a trunk line from a switching management device and a plurality of terminal devices connected to the switching devices. In the switching system configured, the switching management device holds information indicating the physical address corresponding to the subscriber number, and by referring to this information, exchange to the physical address is performed. The present invention provides an exchange system in which a terminal device on the receiving side can be specified using a subscriber number independent of location.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a ring-shaped exchange system according to an embodiment of the present invention. In the figure, 1a, 1b, 1c, and 1d are terminal devices, 2a and 2b are switching devices, 3 is a switching management device, and 4 is a ring-shaped trunk line. Each exchange device 2a, 2b and exchange management device 3 are configured using a processing device dedicated to exchange, as well as a microcomputer, a minicomputer, or the like. The ring-shaped trunk line 4 is, for example, a coaxial cable or an optical fiber.

FIG. 2 is a block diagram showing a switching device in the switching system of FIG. 1. In the figure, 2 is a switching device similar to each switching device 2a, 2b in FIG. 1, 5 is a CPU (central processing unit), 6 is a storage device,
7 is a communication device. In the storage device 6,
Various programs and data to be read and processed by the CPU 5 are stored, and the communication device 7 includes a transmission control and a communication path switch for transmitting signals between the terminal device 1 and the exchange management device 3. It's hardware. Inside the storage device 6, there are an in-office subscriber number table 8, an exchange processing section 9, and the like.

FIG. 3 is a block diagram showing an exchange management device in the exchange system of FIG. 1. In the figure,
10 each existing in the exchange management device 3 are
A CPU, 11 a storage device, and 12 a communication device.
The storage device 11 stores various programs and data that are read out and processed by the CPU 10, and the communication device 12 is hardware for transmitting signals with the exchange device 2. Storage device 1
1 includes an address conversion table 13, an exchange management section 14, and the like. The storage device 11 in which the address conversion table 13 is stored is configured using a read-on memory (ROM), a random access memory (RAM), a disk device, and the like.

FIG. 4 is a format diagram showing the format of signals transmitted in the switching system of FIG. 1. In the figure, 15 is a command response code field, 16 is a called subscriber number field, and 17 is an additional data field. Note that each command response code field 15, called subscriber number field 16, and additional data field 17 may be arranged in any order;
It is necessary to determine this in advance by agreement between the exchange management devices 3. The command response code field 15 contains a code indicating the type of signal (for example, the type of address control signal or response to an address control signal), and the called subscriber number field 16 contains a code indicating the type of signal (for example, an address control signal or a response to an address control signal). Enter the subscriber number assigned to the side terminal device.

FIG. 5 is a diagram showing the stored contents of the intra-office subscriber number table in the switching device of FIG. 2. In the figure, 81 existing in the in-office subscriber number table 8 is the physical address of the switching device, 82 is the number of terminal devices connected to the switching device, and 83 is the physical address of the switching device.
is the subscriber number, and 84 is the terminal physical address.
In the example shown in FIG. 5, for the subscriber numbers 83 (1) to (n) of the terminal devices connected to the switching device 2, the corresponding terminal physical addresses 84
(1) to (n) are provided.

FIG. 6 is a diagram showing the stored contents of the address exchange table in the exchange management device of FIG. 3. In the figure, reference numeral 131 indicates a subscriber number, and reference numeral 132 indicates a physical address of a switching device and a physical address of a terminal, which are respectively present in the address conversion table 13. In the example shown in FIG. 6, all the subscriber numbers 131 of the terminal devices 1 connected to the switching device 2 are
For (m), the physical address of the switching device and the physical address of the terminal 132 (1) to 132 correspond to each other.
(m) is provided.

FIG. 7 is a diagram showing an example of a signal sequence between the switching device and the switching management device in the switching system of FIG. 1. In the example shown in FIG.
The terminal device 1a connected to the switching device 2b
When requesting connection by dialing to the terminal device 1d connected to each switching device 2,
2 shows a signal sequence between a, 2b and the exchange management device 3. In FIG. 7, 18 is a dial connection request signal, 19 is an address control signal from the exchange device 2a to the exchange management device 3, 20 is an address control signal from the exchange management device 3 to the exchange device 2b,
21 is an incoming call signal.

Next, the operation of the above-mentioned exchange system of the present invention will be explained with reference to the above-mentioned FIGS. 1 to 7. Now, when the switching device 2a receives the dial connection request signal 18 from the terminal device 1a, the subscriber number 83 indicated in the dial connection request signal 18 is
From (i), the intra-office subscriber number table 8 in the switching device 2a is referred to, and it is checked whether subscriber number 83 (i) exists. As a result, subscriber number 83
If (i) does not exist in the subscriber number 83, set a code indicating a connection request in the command response code field 15, set (i) of the subscriber number 83 in the called subscriber number field 16, The address control signal 19 is transmitted to the exchange management device 3. When the exchange management device 3 receives the address control signal 19, it refers to the address conversion table 13 from (i) of the subscriber number 83 set in the called subscriber number field 16 in the signal. This address conversion table 13
Since all available subscriber numbers 131 are set in ascending order, subscriber number 131 (i) always exists, so this subscriber number 13
The physical address of the switching device in the terminal device corresponding to (i) of 1 and the terminal physical address 132 (i) are determined. The physical address of this switching device and the terminal physical address 132 (i), that is, the received address control signal 20 is transmitted to the switching device 2b. When the switching device 2b receives the address control signal 20, it sends the incoming call signal 2 to the terminal device 1d corresponding to (i) of the physical address of the switching device and the terminal physical address 132.
1 to notify that a connection request has been made.

〔Effect of the invention〕

As explained above, the present invention is applicable to a switching system consisting of a plurality of switching devices connected to a trunk line, a switching management device, and a plurality of terminal devices connected to the switching devices. Since it is configured so that the other party's terminal device can be specified using an independent subscriber number, even if the physical location of the terminal device is changed, there is no need to change the subscriber number as in conventional examples of this type. This provides an excellent effect in that the terminal device on the receiving side can be specified very easily.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a ring-shaped exchange system which is an embodiment of the present invention, and FIG.
3 is a block diagram showing the exchange management device in the exchange system of FIG. 1, and FIG. 4 is a block diagram showing the exchange management device in the exchange system of FIG.
FIG. 5 is a format diagram showing the format of signals transmitted in the switching system shown in FIG. FIG. 7, which is a diagram showing the stored contents of the address conversion table in the exchange management device, is a diagram showing an example of a signal sequence between the exchange device and the exchange management device in the exchange system of FIG. 1. In the figure, 1, 1a to 1d...terminal device, 2,
2a, 2b...exchange device, 3...exchange management device, 4...
Ring-shaped trunk line, 5, 10... CPU (central processing unit), 6, 11... storage device, 7, 12... communication device,
8...Internal subscriber number table, 81...Physical address of switching device, 82...Number of terminal devices, 83,131
...Subscriber number, 84...Terminal physical address, 9...Exchange processing unit, 13...Address conversion table, 132
…The physical address of the switching device and the physical address of the terminal,
14... Exchange management processing unit, 15... Command response code field, 16... Called subscriber number field, 1
7... Additional data field, 18... Dial connection request signal, 19, 20... Address control signal, 21
...This is an incoming call signal. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] 1. In a switching system consisting of a plurality of switching devices and a switching management device connected to a trunk line, and a plurality of terminal devices connected to the switching device,
The switching device includes an in-office subscriber number table showing a correspondence between a subscriber number assigned to the terminal device and a terminal physical address indicating an accommodation position in the switching device to which the terminal device is connected;
The terminal device receives the called subscriber number specified by dialing, refers to the in-office subscriber number table, and if the called subscriber number exists, assigns the called subscriber number to the physical address of the terminal. means for converting the terminating subscriber number into an exchange connection, and if the terminating subscriber number does not exist in the in-office subscriber number table, the terminating subscriber number is converted from the switching device to the switching management device using the trunk line. and means for transmitting an address control signal including: the switching management device transmitting the subscriber numbers of all the terminal devices connected to the switching device;
The terminating terminal device refers to the address translation table indicating the correspondence with the physical address of the switching device to which the terminal device is connected, and the terminating subscriber number included in the address control signal. A switching system comprising means for determining the existing switching equipment and transmitting the address control signal including the called subscriber number to the switching equipment using the trunk line.