JPH0617398Y2 - Telephone switching equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a telephone exchange device to which a PB dial extension telephone is connected.

[Conventional technology]

Generally, a switching device to which a PB dial type telephone is connected detects a PB dial signal from the telephone and performs various controls based on the detected force.
In this case, if there are a plurality of telephones, a receiver for the PB dial signal is provided for each telephone and the detection powers thereof are connected in parallel.

[Problems to be solved by the invention]

However, such a conventional method has a problem that the number of telephones and the number of receivers are proportional to each other, and the price of the receivers is higher than the price of the telephones, so that the more the number of telephones is, the more economical the economy is. It was

[Means for solving problems]

In order to solve such a problem, the present invention is designed so that the input of the PB dial receiving means is sequentially switched and connected to a plurality of telephones.

[Action]

Telephones are sequentially connected to the PB dial receiver,
When the signal detection force appears, switching stops and the same PB
When the dial signals are continuously received for a fixed time, the PB dial signal output is sent out.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of the present invention,
One line of the PB external line 2 is accommodated in the line terminals L ₁ and L _{2 of the} telephone exchange device 1, and the telephone terminals 3 _1a , 3 _{1b to} 3 _na and 3 _nb each have a pair of call lines 4 ₁ to 4 4. A two-wire PB dial type connected in a star shape by means of _n (a method in which a plurality of telephones are connected to one main unit by individual wiring as shown in FIG. 1 is called a star connection). Standard telephones (hereinafter referred to as telephones) 5 _{1 to} 5 _n are housed, and as shown by the circuits of the telephones 5 ₁ and 5 _n as a representative, between the PB external line 2 and each telephone line 4 ₁ to 4 _n. , the contact l ₁ ¹ line relay and the corresponding telephone ^{_{5 1 ~5 n, l 1 2}} ~l n 1, l n 2 ( coil line relay not shown) is inserted into each individual as an extension switching means Through these, each telephone is exchange-connected to a PB line or an extension circuit described later.

However, in this example, the telephones 5 ₁ and 5 ₂ (the telephone 5 ₂ is not shown) are defined as specific telephones, and the line relay contacts l ₁ ¹ , l ₁ ² and l corresponding to these telephones are defined. ₂ ¹ , l ₂ ²
(The contacts l ₂ ¹ and l ₂ ² are not shown) are always operated and controlled to the positions shown by the dotted lines, and the PB external line 2 and the communication line are connected.
The contacts l ₁ ¹ , l ₁ ² , l ₂ ¹ and l ₂ ² between 4 ₁ and 4 ₂ use break contacts, and the telephones 5 ₁ and 5 ₂ are connected to the PB external line 2 by the restoration of this relay. And prepare for a power outage. In addition, in the telephones 5 _{3 to} 5 _n other than the specific telephones 5 ₁ and 5 ₂ , the contact points of the above-mentioned line relay (only l _n ¹ and l _n ² are entered in the figure) are controlled to be in the normally restored state. In addition, make contacts are used for the contacts l ₃ ¹ , l ₂ ² -l _n ¹ , l _n ² between the PB external line 2 and the telephone lines 3 _{3 to} 3 _n, and the telephone 5 is operated by the operation of the line relay. _{3 to} 5 _n are connected to the PB external line 2.

Further, on the PB outer line side of each contact of these line relays, a contact h of a holding relay (not shown) and a holding circuit _constituted by a resistor R _h for closing a DC loop are connected in parallel, and a resistor R _A reserved sound source circuit 6 including an amplifier and a Melody sound generating circuit is connected to both ends of _h via a capacitor C _h and a transformer T _h . Also,
An incoming circuit including a capacitor C _R and an incoming detection circuit 7 is connected in parallel with the holding circuit, and the incoming detection circuit 7 drives the photocatcher 8 when an incoming call is received.

On the other hand, loop detection circuits 9 _{1 to} 9 _n for detecting the loop current on the extension side, such as a photo cutler, are used on the call lines 4 ₁ to 4 _n of the contacts l ₁ ² , l ₂ ² ... l _n ² of the line relay. It is inserted so as to detect the loop current supplied via the transformers T _{l1 to} T _ln when the extension loop is closed. Further, photo-thyristor 10 ₁ to the connection point of contact l ₁ ² and the loop detection circuit 9 ₁
The ringing signal sound circuit 11 is connected through the same, and the photo thyristors 10 ₂ to 1 are similarly connected to the other loop detection circuits 9 _{2 to} 9 _n.
A ringing tone circuit 11 is connected via 0 _n (only the photothyristor 10 _n is shown).

Reed relay 12 is connected between the line relay l ₁ ² and the line terminals L _1, it operates when the loop current flows through the PB external 2, and summer to close the contacts 12 _a. Reference numeral 13 is an extension ringing tone circuit composed of a voice synthesizing IC, 14 is a PB dial receiver, and these are connected to the transformers T _{l1 to} T _ln via a communication path switch 15. 16 sets each function such as voice guidance mode and tone mode,
It is a function setting circuit composed of a display switch or the like.

For these, a microprocessor 17 is provided,
Incoming call detection circuit 7, loop detection circuit 9, reed relay 1
2. The control determination is made according to the detection output from the function setting circuit 16 to perform various controls.

However, a commercial power supply is used as the main power supply for this device, and a DC voltage is generated by a power supply circuit (not shown) and supplied to each part. Even if a momentary interruption occurs, the DC voltage can be continuously supplied for a certain period of time.

In addition, the microprocessor 17 sets the contact points l ₁ ¹ , l ₁ ² , l ₂ ¹ and l ₂ ² of the line relay to the operating state (the position of the dotted line in the figure) according to the energization of the main power source, and when the main power source fails. Or, if necessary, restore the state, while the contacts of the line relay l ₃ ¹ , l ₃ ² , l ₄ ¹ , l ₄ ²
・ ・ ・ L _n ¹ and l _n ² are always in the recovery state (the position shown by the contact l _n in the figure) and are in the operating state as necessary. When the power is turned on, the telephones 5 _{1 to} 5 _n are individually connected to the call current supply circuit composed of the loop detection circuits 9 _{1 to} 9 _n and the transformers T _{l1 to} T _ln via the contacts of these line relays. .

Therefore, when a call is made off-hook in any of the telephones, this is detected by the loop detection circuit 9, and the microprocessor 17 determines the calling telephone in response to this. Further, the loop detection circuit 9 is also used for judging the end of call during an extension call.

First (first digit) P coming from the phone after off-hook
If the B dial signal is a specific telephone number such as dial "0", the signal is, for example, a line relay contact 1 or a transformer T.
l, PB dial receiver 1 via the call path switch 15
4 is supplied. Accordingly, the microprocessor 17 which receives the detection result of the PB dial receiver 14 controls a relay coil (not shown) to connect the line relay contact 1 corresponding to the telephone that has transmitted the specific telephone number to the PB receiver side (transformer side, That is, it operates or recovers from the extension side) to the PB outside line, and thereafter sends the PB dial signal coming from the telephone set to the PB outside line via the line relay contact 1.

On the other hand, if the first PB dial signal coming from the telephone is an extension number such as any one of the dials "2" to "6", the exchange determination is made according to the detected extension number, The thyristor corresponding to the call telephone is controlled to send out a calling signal. At this time, the line relay does not operate.

In response to this, when the called telephone responds by off hook, the loop closure due to this is detected by the loop detection circuit 9, and in response to this, the microprocessor 17 causes the contacts l ₁ ¹ , l _{1 of the} line relay. ^The corresponding one of ^{2 to} l _n ¹ and l _n ² is controlled to make an extension call.

In addition, in the case of an outside line transmission, the reed relay 12 detects the loop current from the exchange station regardless of the line voltage polarity on the PB outside line 2 side, and the loop current is cut off by the on-hook due to the end of the call. Then, according to the disappearance of the detected output, the microprocessor 17 causes the contact point l ₁ ¹ ,
l ₁ ² to l _n ^1, those corresponding of the l _n ² and connection to the extension circuit, opens the PB external 2.

On the other hand, an incoming call from the PB external line 2 is detected by the incoming call detection circuit 7, the photocatalyst 8 is turned on, and the microprocessor 17 is turned on by the photothyristor 10.
_{Since the} ringing tone circuit 11 is driven after turning on all ₁ to 10 _n , the ringing tones are simultaneously sent to the respective telephones 5 _{1 to} 5 _n , so that the respective tone ringers ring simultaneously. If any of the telephones answers, the connection to the PB external line 2 is continued in the same manner as described above, and the answering call can be freely performed.

Also, if a power failure occurs in the main power supply, all relays will be in a restored state and extension calls will not be possible, but contacts l ₁ ¹ , l ₁ ² , l ₂
^{Since 1} and l ₂ ² are closed on the break contact side, P
Since the telephones 5 ₁ and 5 ₂ are connected to the B line 2, they can freely make and receive calls to and from an outside line even during a power failure, while the other telephones 5 _{3 to} 5 _n have contact points l ₃ The make contacts of ¹ , l ₃ ^{2 to} l _n ¹ , l _n ² are turned off and disconnected from the PB line 2, and only _two telephones 5 ₁ and 5 ₂ are connected in parallel to the PB line 2. It will be in a state of being.

However, the telephones 5 ₁ and 5 ₂ are set in priority order, and the microprocessor 17 checks the detection output of the loop detection circuit 9 in response to the recovery of the power failure, and the contacts l ₁ and l _{2 of the} line relay.
Medium, off-hook, and the one corresponding to the one with a higher priority are kept in the recovery state, and the other is controlled to be in the operating state.When one is on an outside line call, the other is on-hook and is in a secret state. Is supposed to hold.

At this time, in order to detect the off-hook state, the relay contact h is operated to temporarily set the hold state, and the contacts l ₁ and l ₂ of the line relay are operated to supply the loop monitoring current. , The off-hook is judged by the detection output of the loop detection circuit 9, and the microprocessor 1
By comparing with the priority data stored in the memory in 7, it is judged that the off-hook and high priority data are generated, and the noise generated by the operation and restoration of the contacts l _{1 to} l _n of each line relay is detected. It is prevented from being sent to the PB line 2.

Reference numeral 20 is a doorphone provided outside the door for dealing with visitors such as visitors, 21 is a doorphone communication circuit for connecting the doorphone to the communication path switch 15, and 22 is a terminal.

FIG. 2 is a flow chart showing the operation of the characteristic portion of this application. The extension number is set to 2 as shown at step 100 in the figure. The extension number is not set to 1 here because the number 1 starts from 2 because the number 1 may malfunction due to chattering or the like. Next step
After the PB dial receiver is connected to the extension as shown at 101, the input of the PB dial signal is waited at as shown at step 102.

When the PB dial signal is input here, step 102 is judged to be "YES", the continuous output counter is cleared in step 103, the PB dial signal code is recorded in step 104, and the PB dial signal is recorded in step 105.
It is determined whether the dial signal is continuously input. If this step is judged to be "YES", step 1
The PB signal detected in 06 is compared with the code recorded in step 104, and if the step 106 is judged to be "YES", the continuous detection counter is counted up as shown in step 107. Then, in step 108, it is judged whether or not the count result has reached 60 ms, and if step 108 is judged as "NO", the flow returns to step 105. As a result, the flow circulates through steps 105-108 until step 108 reaches 60 ms.

Eventually, step 108 comes to be judged as "YES", and as a result, as shown in step 109, the PB of the extension is concerned.
After the dial code is output, it is judged in step 110 that "Exit 6" is completed.
Therefore, this step is determined as "NO", and the step 11
Since the extension number is incremented by 1 at 1, the extension 3 is connected to the PB dial receiver at step 101. Then, the same operation as described above, that is, when the PB dial signal is received in step 102, the continuous detection counter is cleared in steps 103 and 104, the PB dial signal code is recorded, and the steps 105 and 10 are recorded.
When the PB dial signals continuously received at 6 are the same, it is judged at steps 107 and 108 whether or not the signals are continuously received for 60 ms, and if the condition is satisfied, at step 109. The PB dial code is output, and the above operations are repeated until the final extension is determined at steps 110 and 111.

The above embodiment can also be applied to a key telephone that accommodates a plurality of two-wire type cordless handsets.

[Effect of device]

As described above, according to the present invention, one PB dial receiver is switched and sequentially connected to a plurality of telephones. When the PB dial signal is detected, the switching is stopped and the PB dial signal is continuously received. Since the detected power is sent out at this time, there is an effect that the economical efficiency is good even if there are a plurality of telephones.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a flow chart showing a PB dial signal receiving operation. 1 …… Telephone switch, 2 …… PB external line, 4 …… Call line, 5 ₁
~ 5 _n ...... Telephone, 6 ...... Hold sound source circuit, 7 ...... Incoming call detection circuit, 9 ...... Loop detection circuit, 10 ...... Photo thyristor, 11 ...... Ring signal tone circuit, 12 ...... Reed relay,
13 ... extension ringing circuit, 14 ... PB dial receiver, 16 ... function setting circuit, 17 ... microprocessor, 20 ... doorphone, 21 ... doorphone communication circuit.

Claims (1)

[Scope of utility model registration request] 1. A telephone exchange in which a plurality of PB dial type standard telephones are star-connected by a pair of call lines, respectively, and a PB dial signal coming through each of the pair of call lines is received to perform various exchange controls. In the apparatus, one PB dial signal receiving means, a switching means for switching the PB dial signal receiving means to each of the pair of call lines in a predetermined order, and an output from the output of the PB dial signal receiving means. If not, the switching means is sequentially switched in the predetermined order. When an output is generated from the PB dial signal receiving means, the switching operation of the switching means is stopped and the PB dial signal is continuously received for a predetermined time. A telephone exchange device, comprising: a control unit for transmitting a PB dial signal output at times.