JPH0750889B2 - Private exchange system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Overview] In addition to normal circuit switching, it has a private branch exchange capable of performing high-speed data exchange capable of constructing a bus LAN between any two or more terminals. It is a multi-function private branch exchange system.

[Industrial application field]

The present invention relates to a private branch exchange system including a plurality of terminals and a private branch exchange that accommodates the plurality of terminals.

With the widespread use of OA equipment in office buildings and the like, it has become necessary for the telephone exchange network in office buildings and the like to be capable of high-speed data exchange as well as normal circuit exchange.

(Prior Art) A large number of terminals are installed in an office building, etc. Here, the term "terminal" is a concept including a normal telephone, a facsimile machine, a telex machine, and a data communication apparatus such as a personal computer.

Therefore, it is not enough for the telephone switching network in an office building to provide only ordinary circuit switching, and it is also necessary to provide high-speed data exchange between terminals.

In a conventional premises network system, an ordinary circuit switch that handles a telephone and the like and a LAN that accommodates a data communication device for high-speed data communication are formed completely independently.
That is, a system dedicated to low-speed circuit switching, a system dedicated to high-speed data, and a system dedicated to high-speed data are separately formed.

[Problems to be Solved by the Invention]

The conventional private branch exchange system has a problem that it is inconvenient for the operator because the system dedicated to normal circuit switching and the system dedicated to high-speed data must be separately considered.

In addition, there is a problem that it is uneconomical because the amount of hardware as a whole is large because the hardware that constitutes a system dedicated to circuit switching and the hardware that constitutes a system dedicated to high-speed data exist separately.

Therefore, in view of the above problems, it is an object of the present invention to provide a private branch exchange system that makes it easy for an operator to use each terminal and also reduces the amount of hardware.

[Means for Solving the Problems]

FIG. 1 is a diagram showing the principle configuration of the present invention. In the figure, 11 is a private branch exchange according to the present invention, which includes other new components of a normal network unit (NW) 12. That is, the common connection bus 13 and the mode switching unit 14.

FIG. 2 is a diagram specifically showing the terminal in FIG.
The terminal is indicated by reference numeral 16 and is connected to the mode switching unit 14 via each subscriber line 15. Each terminal (the top one is specifically shown as a representative because it has the same configuration) 16 is a line connection interface 21 and a common connection bus interface 22.
And a switch unit 23 for selectively connecting these interfaces 21 and 22 to the corresponding subscriber line 15. Reference numeral 24 is a processing unit that performs the original operation of each terminal.

FIG. 3 is a diagram more specifically showing the private branch exchange in FIG. In the figure, a private branch exchange 11 is provided with a mode management unit 31 and a mode switching control unit 32.

[Work]

In FIG. 1, the mode switching unit 14 is switched in response to a request from the terminal 16, the circuit switching mode is formed when connecting to the network unit 12, and the common connecting bus is formed when connecting to the common connecting bus 13. A bus-type LAN mode for forming a bus-type LAN (Local Area Network) between two or more terminals 16 that are shared is formed.

In FIG. 2, when the terminal 16 requests the circuit switching mode, the switch unit 23 is switched to the line connection interface 21 side and the mode switching unit 14 is switched to the network unit 12 side.

When the terminal 16 requests the bus type LAN mode, the switch unit 23 is switched to the common connection bus interface 22 side and the mode switching unit 14 is switched to the common connection bus 13 side.

In FIG. 3, the mode management unit 31 accepts a mode switching request from the terminal, and the mode switching control unit 32 controls the switching of the mode switching unit 14 in response to a command from the mode management unit 31.

〔Example〕

FIG. 4 is a diagram showing an embodiment of the present invention. Note that the same components are denoted by the same reference numerals or symbols throughout the drawings. In the figure, 31 is the above-mentioned mode management unit, which is specifically composed of a line connection interface 41, a common connection bus interface 42, an internal bus interface 43, and a mode management processor 44 for managing these. The internal bus interface 43 is connected to the above-mentioned mode switching control unit (MSC) 32, and the control unit 32 is further connected to the internal bus 4
Coordinate with a control processor (CC) 46 via 7. In addition,
The control unit 32 drives the switch driving unit 45 to drive the mode switching unit.
Switch the 14 contacts to the lower side (circuit switching mode) or the upper side (bus type LAN mode) in the figure.

FIG. 5 is a sequence diagram showing an operation example in FIG. The upper column (1) in this figure shows the switching state from PBX to LAN, that is, the circuit switching mode to the bus LAN mode, and the lower column (2) shows LAN to PBX, that is, the mode switching state opposite to the above. Show.

(1) Transition from PBX connection state to LAN connection state Use the line connection interface 21 from the terminal 16 to dial and call the mode management unit 31 of the private branch exchange 11 to make a connection request to the bus LAN. . The transfer data at this time is, for example, “request command + own line number (telephone number) N”.

The mode management unit 31 issues a command to the mode switching unit 32 via the internal bus interface 43 to disconnect the line of the telephone number N from the subscriber circuit and connect it to the common connection bus 13.

The mode switching control unit 32 requests the CC 46 to disconnect the corresponding line, and after obtaining the consent, disconnects the corresponding line from the subscriber circuit via the switch drive unit 45 and connects to the common connection bus 13. .

Since the relevant line has been disconnected from the subscriber circuit, the CC46 changes the contents of the subscriber table (memory in the CC46) and deletes the subscriber data.

As described above, each terminal 16 is connected to the common connection bus 13 and can perform high-speed data communication of n: n (meaning n terminals), and a bus type LAN is formed.

Even if the terminal 16 is accommodated under the network, the mode management unit 31 is instructed to the bus LAN (LAN
The status information can be obtained by inquiring about the number of connected terminals, etc.).

For example, it is possible to confirm in advance whether a terminal that wants to form a LAN group is connected to the LAN.

Furthermore, the terminal connected to the bus LAN can know the status of the bus LAN (the number of terminal devices connected to the LAN, etc.) via the mode management unit 31.

(2) Transition from LAN connection state to PBX connection state The terminal 16 requests the mode management unit 31 via the common connection bus interface 42 to connect its own terminal to the subscriber circuit of the network. The transfer data at this time is, for example, “request command + own line number (telephone number) N” (the number used before LAN connection). The mode management unit 31 sends N to the mode switching control unit 32.
Request that the line be connected to the subscriber circuit.

The mode switching control unit 32 controls the switch driving unit 45 to connect the N line to the subscriber circuit and request the CC 46 to re-register the N line in the subscriber table.

The CC 46 changes the contents of the subscriber table and returns the N lines to the usable state.

With the above operation, the terminal can be restored from the LAN terminal to the PBX line terminal.

FIG. 6 is a flow chart showing an outline of processing of the terminal.
Step a is the start of a subroutine for line connection management processing. In step b, the terminal request is circuit switched mode (PBX)
Check if it is in bus LAN mode (LAN). If it is a LAN, an action for that is taken to the mode management unit 31 in step c (step c). In step d, the switch unit 23 in the switch is switched to the LAN side. The last RET is
It also means returning to the initial operation.

If the request from the PBX is recognized in step b, the mode management unit 31 takes an action for that in step e. In step f, the switch section 23 in the switch is switched on the PBX side.

FIG. 7 is a flow chart showing an outline of processing of the control processor. The control processor (CC) 46 executes a line management subroutine regarding switching between PBX and LAN. In step a, it is checked whether the connection change request from the terminal is the bus LAN mode (LAN) or the circuit switching mode (PBX).
If it is a LAN, in step b, the terminal is removed from the network system. That is, the registration of the subscriber table is deleted. In step c, the voice mail device (see 50 in FIG. 4) is driven to notify the other terminals accessing the terminal that the terminal is unused.

If it is the PBX in step a, the subscriber table is re-registered in order to return the terminal to the network system again in step d. In step e, the unused message is deleted.

FIG. 8 is a flow chart showing an outline of processing of the mode management unit. The mode management unit 31 executes a request management subroutine.

In step a, is the terminal requesting bus-type LAN mode (LAN connection), circuit switching mode (PBX connection), or is it currently in bus-type LAN mode (LAN)?
State).

In case of LAN connection, steps b to e are executed, in case of LAN state, steps f and g are executed, and in case of PBX connection, steps h to k are executed. The "terminal management table" appearing in this flowchart is formed in a part of the memory (not shown) in the mode management processor 44 shown in FIG.

〔The invention's effect〕

According to the present invention, by using one twisted pair line (subscriber line), the data terminal is operated by the PB by operating the data terminal.
It is possible to build a network that can be used as an X-line terminal or conversely connected to a bus LAN.

In other words, it is possible to use one twisted pair wire in common without separately preparing the line for the PBX line terminal and the line for the bus type LAN, which saves the cable and has a great economical effect. .

Also, unlike the conventional LAN, the number of terminals connected is not fixed,
Since it is possible to freely increase or decrease the number of connected units, it is possible to construct a LAN that suits the application, from small to large-scale LANs.

[Brief description of drawings]

FIG. 1 is a diagram showing a principle configuration of the present invention, FIG. 2 is a diagram specifically showing a terminal in FIG. 1, FIG. 3 is a diagram more specifically showing a private branch exchange in FIG. 1, and FIG. Is a diagram showing an embodiment of the present invention, FIG. 5 is a sequence diagram showing an operation example in FIG. 4, FIG. 6 is a flow chart showing a process outline of the terminal, and FIG. 7 is a process outline of the control processor. FIG. 8 is a flowchart showing an outline of processing of the mode management unit. In the figure, 11 ... Private branch exchange, 12 ... Network part, 13 ... Common connection bus, 14 ... Mode switching part, 15 ... Subscriber line, 16 ... Terminal, 21 ... Line connection interface, 22 ... … Common connection bus interface, 23 …… Switch section, 31 …… Mode management section, 32 …… Mode switching control section, 45 …… Switch drive section, 46 …… Control processor.

Claims (3)

[Claims] Claims: 1. A private branch exchange comprising a plurality of terminals (16) and a network section (12) built-in, which is connected to the plurality of terminals (16) through respective subscriber lines (15) for circuit switching. A private branch exchange system comprising: a common connection bus (13) built in the private branch exchange together with the network unit (12); and the common connection bus (13) or the network unit (12).
And a mode switching unit (14) built in the private branch exchange for selectively connecting the terminal (16) to the terminal (16), and the mode switching unit according to a request from the terminal (16). (1
4) is switched to form a circuit switching mode when connecting to the network section (12), and the common connection bus (13)
When connecting to a LAN, a bus LAN (Local Area Network) is used between two or more terminals that share the common connection bus (13).
A private branch exchange system characterized by forming a bus-type LAN mode for constructing k). 2. Each of the terminals (16) has a line connection interface (21) and a common connection bus interface (22).
And a switch unit (23) for selectively connecting the line connection interface (21) or the common connection bus interface (22) to the corresponding subscriber line (15), the terminal (16) being When requesting circuit switched mode,
The switch unit (23) is switched to the line connection interface (21) side, the mode switching unit (14) is switched to the network unit (12) side, and the terminal (16) requests the bus LAN mode. In this case, the switch section (23) is switched to the common connection bus interface (22) side and the mode switching section (1
The private branch exchange system according to claim 1, wherein 4) is switched to the common connection bus (13) side. 3. A mode management unit (31) for receiving a mode switching request from the terminal (16), and the mode management unit (31).
3. The private branch exchange system according to claim 2, further comprising a mode switching control unit (32) for performing switching control of the mode switching unit (14) in response to a command from the private branch exchange.