JPH0223079B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a button telephone device.

Conventionally, in this type of button telephone device, a button telephone KT is used as shown in Fig. 1 and Fig. 2.
1. Connect six wiring cables EL101, EL201, EL301, respectively between KT60 and button telephone interface circuit L1, L60 of main device ME.
EL401, EL501, EL601 and wiring cable EL160, EL260, EL360, EL46
0, Connect with EL560, EL660, wiring cable EL101, EL201; EL160, EL260
to form a first bidirectional audio frequency communication path, and the wiring cables EL301, EL401; EL360, EL
460 forms a second bidirectional audio frequency communication path, and the distribution cables EL501, EL601; EL5
60, EL660 forms a bidirectional digital data transmission path, and wiring cables EL301, EL40
1, EL501, EL601; EL360, EL46
0, EL560, and EL660 were used as phantom wires to form a power supply path, but this still required 6 wiring cables, which made it impossible to use the existing 4-wire wiring cable, and as a result, No cost savings could be achieved. The present invention aims to provide a new key telephone device that reduces the number of wiring cables to four and realizes various functions such as handset extension and outside calls, hands-free extension calls, speaker monitoring, and off-hook signaling or tone signaling. It is.

The button telephone device of the present invention will be explained below along with the drawings.

In Figures 3 and 4, ME is the main device;
The first to 60th button telephones KT1 to KT60 each have four wiring cables EL101, EL201,
EL501, EL601 and wiring cable EL16
0, EL260, EL560, and EL660. X1 is a first switching matrix of the main device ME, and its row lines are connected to the first to 60th button telephone interface circuits L1 to L60 via lead wires FL101 to FL160.

X2 is a second switching matrix of the main device ME, whose row lines are connected to some of the column lines of the first switching matrix X1 via lead wires XI1 to XI4, and whose column lines are connected to lead wires TS21 ~TS
24 respectively to an audio signal source.
IT1 to IT4 are first to fourth extension communication circuits connected to the lead wires XI1 to XI4, respectively, and lead wires XU1 and XD forming unidirectional voice communication paths, respectively.
1; XU2, XD2; XU3, XU4; Connected to XD4. For X3, the row line is the lead wire FL1
In the third switching matrix connected to 01 to FL160, some of the column lines are connected to the lead wires XU.
１、XD１、XU２、XD２、XU３、XD３、XU
4. Connected to XD4 and the rest is lead wire TS3
1 to TS34 to an audio signal source. C1 to C16 are lead wires XC1 to XC16 respectively
via the first switching matrix X1
The first to 16th office line interface circuits are connected to the rest of the column lines of the office lines CL101 and CL2, respectively.
01;...; Connected to the central office via CL116 and CL216. For X4, the column wire is the lead wire XE1
- A fourth switching matrix connected via XE16, in which the row lines are connected via lead wires
It is connected to DTMF sending circuits SDR1 to SDR4. C is lead wire FL501, FL601;~;
The first to 60th button telephone interface circuits L1 to L via FL560 and FL660, respectively.
60, which is connected to the first to sixteenth office line interface circuits C1 to C16 via lead wires CF, and which is connected to lead wires CS1 to C16.
It is connected to the first to sixteenth office line interface circuits C1 to C16 via CS16, respectively, and is connected to the first to sixteenth office line interface circuits C1 to C16, respectively via lead wires SS1 to SS4.
It is connected to the DTMF sending circuits SDR1 to SDR4, and further connected to the first to fourth switching matrices X1 to X4 via lead wires YS1 to YS4, respectively, and connected to the first to fourth switching matrices via lead wires YCL. It is connected to switching matrices X1 to X4. NM is a numerical storage circuit, which is connected to the main control circuit CC via an address bus, and to the main control circuit CC and DTMF sending circuits SDR1 to SDR4 via a data bus.

The connection state between the button telephones KT1 to KT60 and the button telephone interface circuits L1 to L60 of the main device ME, especially the connection state between the button telephone KT1 and the button telephone interface circuit L1, is explained in detail in accordance with FIG. This will be explained in more detail below. RCU and CMC are each button telephones.
Connect the wiring cable EL10 to the handset and transmitter of the KT1 handset via the hybrid circuit NW.
1. Connected to EL201. KPD is the push button pad of the button telephone KT1, 0-9, CO,
The row and column lines that form cross points corresponding to pushbuttons such as ICM, SP, and R are connected to the control processor.
Connected to the scanning circuit SCN of SCP. CTL is a control circuit for the control processor SCP, which drives the scanning circuit SCN and transfers the scanned content to the dial memory circuit.
Let DM remember it. DTR101 is a data transmission/reception circuit connected to the scanning circuit SCN and control circuit CTL, and includes a transformer T102 and a capacitor C
Wiring cable EL50 via 101, C102
1. Connected to EL601. SP is a speaker amplifier with an audible signal source TON inserted between the input terminals
A speaker is connected to the output end of the SPA, and is connected to the wiring cables EL101 and EL201 via the speaker amplifier SPA and the transformer T101. MIC is a microphone, which is connected to the wiring cable EL10 of the transformer T101 via the microphone amplifier MCA and the transformer T101A.
1. Intermediate tap of EL201 side winding and wiring cables EL501 and EL60 of the transformer T102
Connected to the middle tap of the first winding. TB is a relay connected to the control circuit CTL, whose normally closed contacts tbc1 and tbc2 are inserted between the hybrid circuit NW and the wiring cables EL101 and EL201, and whose normally open contacts tbo1 and tbo2 are connected to the transformer T1.
01 and the wiring cables EL101 and EL201. LT is another relay connected to the control circuit CTL, in which a normally closed contact ltc is inserted between the speaker amplifier SPA and the transformer T101, and a normally open contact lto is inserted between the speaker amplifier SPA and the audible signal source TON. is inserted into. POW is a power supply circuit whose output end is connected to the data transmitting/receiving circuit DTR101, etc., and whose input end is CH1
Wiring cable EL5 through each coil of 01
01, connected to EL601. T61 is the transformer of the button telephone interface circuit L1, and the two windings on one side are connected to the wiring cable EL.
101 and EL201, and the winding on the other side is connected to lead wire FL101. DTR61
is a data transmitting/receiving circuit of the button telephone interface circuit L1 connected to the lead wires FL501 and FL601, and includes a transformer T63 and a capacitor C.
62, the wiring cable EL50 via C63
1. Connected to EL601. T62 is another transformer whose winding on one side is connected to the lead wire FL401, and one end of the winding on the other side is connected to the two windings on the one side of the transformer T61, respectively, with capacitors C61 and C6.
1A, and the other end is connected to the transformer T6.
It is connected to the intermediate tap of the wiring cable EL501 and EL601 side winding of No.3. E is a DC power supply connected to the data transmitting/receiving circuit DTR61, and is connected to the wiring cables EL501 and EL601 via respective coils of the cable CH61.

The operation of the button telephone device of the present invention will now be described in detail.

First, from the button telephone KT1 to the button telephone
A case will be described in which the KT 60 is called and an extension call is made using the handset.

When the handset of the button telephone KT1 is lifted off the hook, the control circuit CTL of the control processor SCP begins to scan the open/closed state of each cross point of the pushbutton pad KPD at regular intervals via the scanning circuit SCN. Press the extension call button ICM of the push button pad KPD and temporarily store it in the dial memory circuit DM via the scanning circuit SCN control circuit CTL.

In the main device ME, the main control circuit CC sends an activation signal onto the lead wire FL501. Accordingly, from the data transmitting/receiving circuit DTR61 of the button telephone interface circuit L1 to the transformer T63,
Wiring cable via capacitors C62 and C63
A starting pulse is sent on EL501 and EL601. Data transmitting/receiving circuit DTR1 via capacitors C101, C102 and transformer T102
A starting pulse is applied to 01, which in turn is transmitted to the scanning circuit SCN of the control processor SCP. As a result, the extension call request signal temporarily stored in the dial storage circuit DM is sent out via the control circuit CTL. The sent extension call request signal is sent to the data transmitting/receiving circuit DTR101, transformer T
102, capacitor C101, C102, wiring cable EL501, EL601, capacitor C6
2, C63, transformer T63, data transmission/reception circuit
It is transmitted to lead wire FL601 via DTR61. When the extension call request signal is transmitted, the main control circuit
CC detects an extension call request from key telephone KT1, sends appropriate signals to lead wires YS1, YS2, and YCL, and switches to switching matrices X1 and X.
2. Select and close the appropriate crosspoint switch. This allows you to connect the handset RCU of the button telephone KT1 to the wiring cable EL10.
1.Connect to an audible signal source via EL201, button telephone interface circuit L1, lead wire FL101, switching matrices X1, X2, and lead wire TS21.

After listening to the output signal of the audible signal source, that is, the dial tone, press the number 60 assigned to the desired key telephone KT60 and press the pushbuttons "6" and "0" of the button pad KPD to create an extension communication path to the key telephone KT60. request. Similar to above,
Accordingly, the main control circuit CC connects the lead wire FL56.
0. Gives an operating signal corresponding to an extension call request to the button telephone KT60 via the button telephone interface circuit L60 and the wiring cables EL560 and EL660. Along with this, the button telephone KT
At 60, the relay TB is activated to connect the speakers to the wiring cables EL160 and EL260.
In addition, the main control circuit CC is connected to the button telephone KT1 via the switching matrix X1 as described above.
and the speaker of the key telephone KT60, and connect the handset of the key telephone KT1, KT60 via the switching matrices X1, X2.
Connect an audio signal source to the KT60. The output signal of the audible signal source is transmitted to the key telephone KT60 and sent out as a ring tone from the speaker, and is transmitted to the key telephone KT1 and sent out as a ringing tone or ring back tone from the handset. When the handset of the button telephone KT60 is lifted, the control processor SCP deactivates the relay TB and connects the handset to the wiring cables EL160 and EL260 via the hybrid circuit. At this time, a message indicating that the key telephone KT60 has been lifted up in response to the ring tone is sent to the main control circuit via wiring cables EL560 and EL660.
The signal is transmitted to CC, and in response, the cross point of switching matrix X2 is opened to disconnect the audible signal source. As a result, the button telephone KT1,
It is now possible to make internal calls between KT60s.

After the extension call ends, press the button telephone KT1, KT6
If the handset of 0 is restored, the button telephone device of the present invention is restored to its original state.

A case will be described in which the key telephone KT60 responds to a call from the key telephone KT1 without using the handset.

Lift the handset of the button telephone KT1 and press the pushbutton pad KPD extension call button ICM.
Press , listen to the dial tone on the receiver RCU of the handset in the same way as above, and then press the number 60 assigned to the key telephone KT60.Press the push buttons "6" and "0" on the button pad KPD to add "0". ” Press. Pressing signal “6” “0” “0”
is given to the main controller CC of the main device ME in the same way as described above. In response to this, operate the relay TB of the button telephone KT60 in the same way as described above, and connect the speaker SP and microphone MIC to the wiring cable EL1.
60, connect to EL260. In addition, the cross points of the switching matrices X1 and X3 are operated appropriately, and the wiring cables EL101 and EL20 are
1, button telephone interface circuit L1, lead wire FL101, switching matrix X1,
Extension call circuit IT1, switching matrix X
4, Lead wire FL160, FL460, button telephone interface circuit L60, wiring cable EL
The speaker and microphone of the button telephone KT60 are connected through the terminals 160, EL260, EL560, and EL660. This allows the button phone
Extension calls can be made between KT1 and KT60. When the handset of the key telephone KT1 is restored after the extension call is terminated, the key telephone device of the present invention is restored to its original state.

A key telephone KT60 is making an extension call using the handset with a key telephone KT50.
Next, when an extension call request arrives from the key telephone KT1, the incoming call notification of the extension call request at the key telephone KT60 and the accompanying start of the extension call will be explained.

When the key telephone KT1 issues an extension call request to the key telephone KT60 in the same manner as described above, the main control circuit CC
Activate the relay LT and connect the audible signal source TON to the input terminal of the speaker amplifier SPA. When the reception button R of the pushbutton pad is pressed on the button telephone KT60, the main control circuit CC puts the extension call with the push button telephone KT50 on hold and connects the extension call path with the push button telephone KT1. If the receive button R of the key telephone KT60 is pressed again while the extension call with the key telephone KT1 is ending or continuing, the extension call with the key telephone KT50 can be continued. Other operations will be clear from the above description and will therefore be omitted.

A case will be explained in which a request for an outside line call is sent from the button telephone KT1 to the central office line, that is, the subscriber cable.

Lift the handset of the button telephone KT1 and press the push button "CO", which is intended to request an outside line call to a central office line, and the numerical button, e.g., "0" or "1", to specify one central office line from 1 to 16. if,
Button telephone KT1 has wiring cable EL101,
EL201, button telephone interface circuit L
1. Central office lines CL101 and CL201 via lead wire FL101, switching matrix X1, lead wire XC1, and central office line interface circuit C1.
connected to. Next, if the other party's assigned number, for example, "2", "3", "4", "5", "6", "7", "8" is pressed in sequence, it will be transmitted to the main control circuit CC and the number will be stored in the numerical memory circuit.
After being stored in the NM, the DTMF is sequentially sent to the central office line CL101, via a DTMF sending circuit such as SDR1, switching matrix
Sent to CL201. In response, the central office captures the other party's line.

A case will be explained in which the button telephone KT1 sends an outside line monitoring request to the central office line using the speaker.

Lift up the handset of the button telephone KT1, press the pushbutton "CO" and, for example, "0" and "1" to connect the button telephone KT1 to the central office line, then press the pushbutton SP intended for a monitor request using the speaker SP. Press. This allows the button phone
The relay TB of KT1 is driven, and the speaker SP is connected to the station lines CL101 and CL201. Next, by pressing a desired number, for example 177, the other party can be captured at the central office and speaker monitoring can be performed, as is clear from the above. By restoring the handset of the key telephone KT1 after the end of speaker monitoring, the key telephone device of the present invention can be restored to its original state.

The power supply from the key telephone interface circuit L1 of the main device ME to the key telephone KT1 will be explained.

As is clear from Figure 4, the DC power supply E is connected to CH61, and the wiring cables EL501 and EL60.
1. Since it is connected to the power supply circuit POW via the telephone CH101, power can be supplied from the main device ME to the button telephone KT1. At this time,
Since the impedance of the cable channels CH61 and CH101 is set to be sufficiently large with respect to the data signals transmitted via the wiring cables EL501 and EL601, there is no adverse effect.

When a call request from the office line arrives at the office line interface circuit C1, it is transmitted to the main control circuit CC via a lead wire XE1, although not shown in FIG. In response to this, a signal similar to that described above is sent to the key telephone, for example KT1, which is not in use, thereby activating the relay TB. As a result, as is clear from the above, the ring tone can be sent from the speaker SP,
This call request can be responded to. The detailed operation will be clearer than the above explanation of the extension call, so the explanation will be omitted.

As is clear from the above, the button telephone device of the present invention includes first and second wiring cables forming a bidirectional audio frequency communication path and a unidirectional audio frequency communication path, and a bidirectional digital data transmission path. Since the button telephone is connected to the main device by the third and fourth wiring cables that form the power transmission path and the unidirectional audio frequency communication path, (a) each cable can be connected using the existing four-wire cable. This allows you to make internal calls, monitor speakers, etc.

(b) It can fully cope with increasing call density.

(c) Substantial cost savings can be achieved.

It has remarkable effects such as

[Brief explanation of drawings]

1 and 2 show a conventional example, FIG. 3 shows an embodiment of the button telephone device of the present invention, and FIG. 4 shows a detailed view of the same part. EL101, EL201, EL501, EL601,
EL160, EL260, EL560, EL660...
...Wiring cable, ME...Main device, KT1, KT6
0...Button telephone, L1, L60...Button telephone interface circuit, X1, X4...Switching matrix, CC...Main control circuit, C1,
C16...Station line interface circuit, NM...Numerical memory circuit.

Claims (1)

[Scope of Claims] 1. A plurality of key telephones are connected to a main device connected to one or more sets of central office lines, and a plurality of key telephones are disposed between the main device and the key telephones, and are capable of transmitting interactive audio to the handset. first and second wiring cables for transmitting a frequency signal and for transmitting a unidirectional audio frequency signal to a speaker; and a first and second wiring cable disposed between the main device and the button telephone, for transmitting a bidirectional digital data signal and power. A button telephone device comprising: third and fourth wiring cables for transmitting a signal; and a unidirectional audio frequency communication circuit for a microphone using the first, second and third and fourth cables, (a) Normally closed contacts tbc1 and tbc2 are inserted between the first and second wiring cables and the handset, and a normally open contact tbo1 is inserted between the first and second wiring cables and the speaker and microphone. , tbo2 is inserted, and is driven by a digital data signal transmitted from the main device via the third and fourth wiring cables, and has the normally closed contacts tbc1, tbc2 and the normally open contacts tbo1, tbo2. (b) The normally open contacts tbo1, tbo2 and the speaker are connected by a transformer via an amplifier, and the normally open contacts tbo1, tbo2 are connected to one winding side of the transformer.
, an amplifier for the speaker is inserted into the other winding side through a normally closed contact LTC, an audible signal source is provided across the input terminals of the amplifier through a normally open contact LTO, and a third , a second relay having the normally closed contact LTC and the normally open contact LTO driven by another digital signal transmitted via a fourth wiring cable, the handset is connected to the key telephone during a call. 2. A button telephone device, characterized in that, in response to a message, the second relay is activated and an audible sound source is connected to a speaker of the button telephone.