JPH04126444A - Private branch of exchange system - Google Patents

Abstract

PURPOSE:To attain backup and restoration processing of a line at power failure automatically and surely by preserving changeover till the end of communication when the communication using a line subjected to power failure is consecutive at restoration of power failure and switching the line to a main line after the end of communication. CONSTITUTION:When communication is started during power failure and the power failure is restored amidst the succeeding communication, a CPU 101 detects a low level output of a communication monitor circuit 118 to keep a relay drive circuit 113 OFF and to keep power failure relays 111,112 to the position shown in broken lines (break position) thereby continuing the succeeding communication. When the communication is terminated and a handset 110 is hooked on, a hook switch 114 is thrown from a power failure talking circuit 116 to a ringing signal generating circuit 115. Thus, the connected external line 2 is interrupted, the CPU 101 detects a high level output of the talking monitor circuit 118 to activate the relay drive circuit 113 and to throw the power failure relays 111,112 to the position shown in solid lines (make position).

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a private branch exchange system, in particular, a private branch exchange system that accommodates an outside line and an extension line, and further accommodates a power outage communication device on the extension side, so that calls can be made using the power outage communication device in the event of a power outage. This relates to a private branch exchange system.

[Prior Art] Conventionally, private branch exchange systems have been known that have a mechanism for maintaining line connections during calls during power outages. FIG. 3 shows the configuration of a conventional private branch exchange system.

In FIG. 3, reference numeral 301 denotes a telephone exchange main equipment; 302
305 is an outside line, and 305 is a power outage relay 306 is a power outage telephone.

When power is being normally supplied to the main telephone exchange unit 301 from a commercial power source, the power failure relay 305 is connected to the broken line side (make side), and the power failure telephone 306 is connected to the line 3.
04, main device f via power outage relay 305 and line 303
301, and is connected to an external line 302 via a communication line (not shown) inside the main device.

When power is not supplied to the telephone exchange main device 301 due to a power outage, etc., the power outage relay 305 is restored and connected to the solid line side (break side), and the power outage telephone 306 is connected to the line 304.
, directly connected to the outside line 302 via a power outage relay 305.

When the power supply to the telephone exchange main device 301 is restored, the power failure relay 305 is again switched to the dotted line side (make side), and the telephone call is made through the above-described normal route.

[Problem to be Solved by the Invention 1] However, in the above conventional example, if a call is started using a power outage telephone during a power outage, and the power outage is restored during the call, the power outage relay is unconditionally disconnected when the power is restored. However, there was a drawback that the call route was cut off and the call was cut off midway through.

SUMMARY OF THE INVENTION An object of the present invention is to provide a private branch exchange system that solves the above problems and can recover from a power outage without interrupting ongoing communications.

[Means for Solving the Problems 1] In order to solve the above problems, in the present invention, an outside line and an extension line are accommodated, and a communication device for power outage is further accommodated on the extension side, so that calls using the communication device for power outage are made in the event of a power outage. In the private branch exchange system that performs power outage recovery, the power outage communication device includes means for changing the connection to the power outage line using the power outage communication device, means for monitoring the communication status on the power outage line, and a power outage recovery system. At this time, if communication using the power outage line is ongoing, control is maintained to switch to the power outage line until the end of the communication, and after the end of the communication, control is performed to switch to the main line. A structure with means was adopted.

[Operation] According to the above configuration, it is possible to maintain the communication that has been continued since the power outage immediately after the power outage is restored, and it is also possible to automatically restore the normal state when the communication ends.

[Example] Hereinafter, the present invention will be described in detail based on an example shown in the drawings.

FIG. 1 shows the configuration of a private branch exchange system employing the present invention.

<Device Configuration> In FIG. 1, reference numeral 1 denotes a main device, which mainly controls an outside line interface 4, an extension interface 5, a communication line section 6 that controls call exchange through time-sharing switching, and the various parts of the main device 1. .

It consists of a CPU 7 that communicates with a telephone connected to an extension line 3 via an extension line 3. Connected to the CPU 7 are a ROM 8 for storing a control program for the CPU and a RAM 9 used as a work area. Note that numeral 2 is an outside line and 3 is an extension line.

On the other hand, the block designated by the reference numeral 10 on the right side of the figure is a power outage telephone (multiple connections can be made as shown), and is connected to one unit W1 through an extension line 3 and an outside line 2. Below is a power outage phone! The structure of 0 will be explained.

Reference numeral 101 is a CPU that controls the entire telephone 10;
2 is a ROM in which the CPU l 01 (7) control program is stored, and 103 is a RAM that stores various control data and various information for the power outage telephone 10 and provides a work area for various calculation processes of the CPU to t. It is.

Reference numeral 104 is an interface circuit for exchanging communication signals and control l signals with one Mt.

105 is a key matrix for accepting keys such as numeric keys and function keys.

106 is an off-hook detection circuit, and 107 is a display section.

Reference numeral 108 indicates a communication circuit used during normal operation without a power outage, 109 a speaker, and 110 a handset.

During a power outage, only the handset 110 is used for telephone calls, and the speaker 109 is used only for ringing during a power outage.

Code 111.112 is a power failure relay, power failure relay 111
is for connecting communication lines during power outage, power outage relay 1
12 connects the speaker 10915 and handset 110 to either the normal call circuit or the power outage call circuit 116. Each power failure relay is switched by the power supply state from the power supply circuit 119 and the control of the CPU I Ol.

The contact switching state indicated by the broken line in the figure indicates that power is being supplied normally and that the relay drive circuit 113 is under control of CPUl0I.
This is the make position when the is ONL and is held by energizing the relay. Further, the contact switching state indicated by the solid line is a break position that is switched in the non-energized state of the relay when there is a power outage or when the relay drive circuit 113 is turned off under the control of CPUl0I.

Reference numeral 113 denotes a relay drive circuit for driving each of the above-mentioned relays, and when power is normally supplied and controlled to the ON state by CPUI O1, each power failure relay 111.
112 at the above meter position.

114 is a hook switch, 115 is a ringing signal generation circuit, 116 is a power outage call circuit, 117 is a dial circuit, 118 is a call monitoring circuit, and 119 is a power supply circuit to the telephone set. The call monitoring circuit 118 detects a call (end of call) state at the time of recovery from a power outage, and its detailed configuration will be described later.

In the above configuration, 1. the normal operation, the operation when a power outage occurs, the call operation during the power outage, the operation when the power is restored, and the operation when the call is ended after the power is restored will be explained.

<Normal operation> Normally, in a state where power is supplied, the relay drive circuit 113 is controlled to be in the ON state by the C transfer U101, and the relays PFI, PF2, PF3, and PF of the power failure relay III and 112 are controlled to be in the ON state.
4 is broken! (make) side, the ringing signal generation circuit 115, power outage call circuit 116, dial circuit 117, and call monitoring circuit 118 are not supplied with power, and calls are made to the call circuit 108 and interface circuit 104.
, extension port 113-.

<Operation when a power outage occurs> When a power outage occurs and the power supply to the main device 1 is stopped, the power supply to the power supply circuit 119 in the power outage telephone 1110 is also stopped, and the relay drive circuit 113, CPU 101, ROM 102,
Power is no longer supplied to the RAM 103, interface circuit 104, off-hook detection circuit 106, display unit 107, and call circuit 108.

Therefore, relay PF1 of power failure relay 111.112
．． PF2, PF3. The PF4 switches to the solid line (break) side, and the outside line 2 is connected to the hook switch edge 114.

Call operation during power outage> FIG. 2 shows the configuration of the call monitoring circuit 118 and related parts in detail. Note that the same parts as in FIG. 1 are denoted by the same numbers.

Outside line 2 is power failure relay 111. It is connected to the power outage call circuit 116 via the hook switch 114 (see FIG. 1), and the capacitor 204 is connected inside the power outage call circuit.
The rectifier stack 205 is connected in parallel with the rectifier stack 205 . The output of the rectifier stack 205 is routed to the call monitoring circuit via the resistor 203 and connected to the resistor 201.

The call monitoring circuit is connected to the line of the power outage call circuit via a resistor 203, and is composed of a photocoupler 200 that detects a call on this line, and resistors 201 and 202.

The operation of making a call to the outside line 2 from the power outage telephone IO during a power outage will be described below.

When the handset 110 is lifted (off-hook), the hook switch 114 connects the outside wa via the power outage relay Ill.
2 is connected to the power outage call circuit 116, and the power outage call circuit 11 is connected to the power outage call circuit 116.
6 closes the loop with the appropriate impedance.

As a result, a dial tone is returned from the central office exchange at the end of the outside line 2, and by dialing using the key matrix 105, the dial circuit 117 makes a call to the outside 1!2 using DP or PB according to the manual power of the key matrix 105. will be carried out. Thereafter, the call is made by the called party who is 112 meters outside.

On the other hand, if a call is received from outside line 2 during a power outage, that is, when the handset 110 is lowered (on-footer),
When an incoming call is received from 2, the incoming signal is sent to the ringing signal generation circuit 1 via the power outage relay 111 and the hook switch 114.
15, and a ringing tone is output from the ringing signal generation circuit 115 to the speaker 109.

When the incoming call is answered by lifting the handset 110 (off-hook), the hook switch 114 switches to the power outage call circuit 1.
16 side, and a call is made.

In addition, in the above-mentioned outgoing and incoming call operations, the handset 1
10, when the outside line 2 is connected to the power outage call circuit 116 via the hook switch 114, the power outage call circuit 116 is powered by the outside line 2, and the rectifier stack 20
A voltage is generated on the output side (+ and one terminal) of 5. however,
During a power outage, the +5V shown in the call monitoring circuit 118 in Figure 2
The power supply to the CPU 101 is stopped, and the power supply to the CPU 101 is also not supplied.

Operation when power is restored> As mentioned above, if a call is started during a power outage and the power is restored while the call is continuing, the power supply to the main unit is resumed and the power outage telephone is activated accordingly. The power supply circuit 119 in m1to starts up, and the relay drive circuit 113. Including CPU10I.

ROM102, RAM103. Power is supplied to the interface circuit 104, off-hook detection circuit 106, display section 107, and telephone call circuit 108.

When the power is supplied again, the CPU 101 performs a power-on reset, and during the initial processing by the reset, controls the relay drive circuit 113 to the OFF state, and turns the power failure relay 1 on.
11. Hold 112 on the broken line side (break side).

If the call has been continuing since before the power was restored, the rectifier stack 205 in the power outage call circuit 116 as described above.
Voltage is generated at the output of the external lI2 due to the power supply, so when the power is restored, the resistor 20 is applied to the photocoupler 200.
2, the rectifier stack 205
The output voltage of resistor 203. A current flows to the light emitting diode on the input side of the photocoupler 200 via the resistor 201, and the collector output of the transistor on the output side becomes a low level.

cpu to t is 11 of this call monitoring circuit 118.
By keeping 1.112 on the broken line side (break side), the ongoing call is held.

<Operation when a call ends after the power is restored> As mentioned above, the call that was held after the power was restored ends,
When the handset 110 is hung up, the hook switch 114
is the ringing signal generation circuit 1 from the power failure communication circuit 116 side.
Switch to the 15 side.

As a result, the power outage call circuit 116 and the power outage relay 111,
The outside line 2 connected via the hook switch 114 is disconnected, power supply to the power outage call circuit 116 is stopped, the voltage on the output side of the rectifier stack 205 disappears, and the resistor 203
The current flowing through the input-side light emitting diode of the photocoupler 200 via the resistor 201 also disappears, and the collector output of the output-side transistor becomes high level.

When cputot detects the high level output of the call monitoring circuit 118, it turns on the relay drive circuit 113 and switches the power failure relays 111 and 112 to the solid line side (make 11!l). From then on, calls will proceed through the normal route.

According to the above embodiment, a means for monitoring the call status of the power outage telephone immediately after the power outage is restored is provided in the power outage telephone, and a means for switching between an outside line and an extension line is automatically controlled based on the monitoring results. Calls that have been continuing during a power outage can be maintained as they are, and calls will no longer be cut off midway when the power is restored, as was the case in the past.

In addition, it detects the termination of a call that has continued during a power outage,
Since the normal state can be restored automatically, there is no need for troublesome manual switching, and it is possible to provide a private branch exchange that is easy to use and highly reliable.

Although a power outage telephone has been exemplified above, the terminal device is not limited to a telephone, and various communication devices can be used.

[Effects of the Invention] As is clear from the above, the present invention provides a private branch exchange that accommodates an outside line and an extension line, further accommodates a power outage communication device on the extension side, and allows calls to be made using the power outage communication device during a power outage. In the system, the communication device for power outage includes means for replacing the connection to the line for power outage using the communication device for power outage, means for monitoring the communication state on the line for power outage, and when the power outage is restored, If communication using railway lines is ongoing,
The system employs a configuration that maintains the switching to the power outage line side until the end of the communication, and then controls the switching to the main line side after the end of the communication, so that immediately after the power outage is restored, It is possible to maintain communication that has continued during a power outage, and it is also possible to automatically restore the normal state when the power outage ends, so there is no need for troublesome operations, and line maintenance during a power outage is automatically and reliably maintained. It is possible to provide an excellent private branch exchange system that can perform backup and recovery processing.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a private branch exchange system employing the present invention, FIG. 2 is a block diagram of the vicinity of a call monitoring circuit, and FIG. 3 is a block diagram showing the configuration of a conventional private branch exchange system. l-- Device 2-- External line 3... Extension circuit l〇- Power outage telephone 101...- CPU
102--ROM103-RAJ'1 111.112--Power outage relay 113--Relay drive circuit 114--Hook switch 116--Power outage call circuit 118--Call monitoring circuit 119--Power supply circuit

Claims (1)

[Scope of Claims] 1) A private branch exchange system that accommodates an outside line and an extension line, further houses a power outage communication device on the extension side, and allows calls to be made using the power outage communication device during a power outage, wherein the power outage communication device includes: means for replacing the connection to the power outage line using the power outage communication device; means for monitoring the communication status on the power outage line; and when communication using the power outage line continues when the power outage is restored; . A private branch exchange system, comprising means for maintaining switching to the power outage line side until the communication ends, and controlling the switching to the main line side after the communication ends.