JPS62123891A - Connection system between key telephone systems - Google Patents

Abstract

PURPOSE:To make mutual connection between key telephone equipment quickly and at low loss and to offer various connection service by connecting between channels and controlling equipments relating to mutual connection between plural key telephone systems. CONSTITUTION:In two sets of key telephone systems 1 and 2, the extension side terminal 13 of a channel switch 11 of the key telephone system 1 and the trunk line side terminal 22 of a channel switch 21 of the key telephone system 2 are connected by a connection line between equipments, and the control circuit 16 of the key telephone system 1 and the control circuit 26' of the key telephone system 2 are connected by a control information transfer line 7. As the connection line between systems 6' connects channel switches directly without passing through a trunk line circuit, extension circuit, etc., loss becomes low, and as the control information transfer line 7 transfers various information for transfer control quickly, connection between the two key telephone systems can be quickened and various service functions can be realized.

Description

[Detailed Description of the Invention] [Summary] An extension line side terminal of a call path switch matrix of a button telephone device is directly connected to an office line side terminal of a call path switch matrix of another button telephone device, and both button telephone devices By connecting the control circuits of the devices using a control information transfer path, it becomes possible to connect the devices quickly, with low loss, and with a variety of services.

[Industrial application field]

TECHNICAL FIELD The present invention relates to an improvement in a connection method between key telephone devices for interconnecting a plurality of key telephone devices.

BACKGROUND OF THE INVENTION Electronic key telephone devices that employ a storage program control system are becoming popular as small-scale private telephone equipment.

When the number of extensions accommodated in a key telephone device increases, a plurality of key telephone devices are installed in the same premises and the extensions are housed in a distributed manner.

In such a case, it is desired that calls across key telephone devices be connected as quickly and with low loss as within the same device, and that a variety of services be provided.

[Conventional technology]

FIG. 5 is a diagram showing an example of a conventional connection system between key telephone devices, FIG. 6 is a diagram showing an example of the office line circuit in FIG. 5, and FIG. 7 is a diagram showing an example of the extension circuit in FIG. It is a figure showing an example.

In FIG. 5, two sets of button telephone devices 1 and 2 are installed.

In the button telephone device 1, one terminal 12 (hereinafter referred to as the office line side terminal 12) of a communication path switch matrix (SFX) 11 using a CMOS analog switch or the like as a cross point is connected to a station accommodating the station vA3. A line circuit (COU) 14 is connected thereto, and an extension circuit (LC) 15 accommodating the extension line 4 is connected to the other terminal 13 (hereinafter referred to as extension side terminal 13).

As shown in FIG. 6, the office line circuit 14 is composed of a communication path on the station vA3 side to which a relatively high voltage such as the main power supply of the exchange is applied, and a communication path switch matrix with a low withstand voltage, such as a CMOS switch. A transformer TR is inserted to separate the communication path from the 11 side.

Similarly, in the extension circuit 15, the communication path on the extension 4 side and the communication path on the communication path switch matrix 11 side are separated by the transformer TR. Furthermore, the data transmitting/receiving circuit (DTR)
transmits and receives push button information, indicator light activation information, etc. to and from the key telephone used by extension 4.

A control circuit (CTL) 16 controls the communication path switch matrix 11 using an accumulation program control method, and
and extension 4, or extensions 4 to each other.

The button telephone device 2 also has a similar configuration.

Furthermore, for calls between the key telephone units 1 and 2, inter-unit connections 6 are provided which are terminated by private line circuits (PVUs) 17 and 27, respectively.

The dedicated line circuits 17 and 27 have their transmitting side terminals connected to the central office line circuit 1.
4 or 24, and the receiving side terminal is connected to the extension circuit 15 or 25.

A call arrives from the central office line 3 accommodated in the button telephone device 1,
When the extension 4 performs a predetermined response operation, the control circuit 16 controls the communication path switch matrix 11, closes the cross point X11, and connects the central office line 3 and the extension 4.

When the central office line 3 requests a call to the extension 5 housed in the button telephone device 2 and the extension 4 performs a predetermined hold operation, the control circuit 16 places the central office line 3 on hold and sets the cross point t-X12. The signal is then closed and transmitted to the inter-device connection path 6 via the office line circuit 14 and dedicated line circuit 17.

In the button telephone device 2, the leased line circuit 27
It is activated and puts the extension circuit 25 in a calling state.

As a result, the dial tone is sent back from the key telephone device 2 to the key telephone device 1 via the inter-device connection path 6.

When extension 4 hears the dial tone from button telephone device 2 and dials the telephone number of extension 5, control circuit 16 connects device connection path 6 to
Then, a dial pulse corresponding to the telephone number is sent out.

In the button telephone device 2, the control circuit 26 transfers dial pulses arriving from the inter-device connection path 6 to the leased line circuit 27.
and receives it via the extension circuit 25, selects extension 5,
If it is vacant, it is called and the ring tone is sent back to the key telephone device 1 side via the inter-device connection path 6. If the extension 5 is busy, a busy tone is sent back to the key telephone device 1 via the inter-device connection path 6.

When the calling extension 5 answers, the control circuit 26 connects to the extension 4 via the inter-device connection path 6.

After informing the extension 5 of the incoming call from the central office line 3, the internal '4IA4 performs a predetermined transfer operation, and the control circuit 16 closes the cross points X13 and X14 in the communication path switch matrix ll, 3 and extension 5 are connected via an inter-device connection path 6.

[Problems to be Solved by the Invention] As is clear from the above explanation, in the conventional connection system between key telephone devices, an incoming call from the central office line 3 accommodated in the key telephone device 1 is transferred to the key telephone device 2. In order to transfer the telephone number to extension 5 accommodated in Because of this, there was a risk that the connection time would be longer.

Furthermore, since the exchange control information that can be transferred in addition to dial pulses is limited, it has been difficult to provide the same variety of services for calls across both devices as within the same button telephone device.

In addition, since the office line 3 and extension line 5 are connected via the office line circuit 14 and extension line circuit 25, each of which has a transformer TR inserted in the communication path, the connection between station '4fA3 and extension line 4 is In comparison, call loss also increases.

[Means for solving problems]

FIG. 1 is a diagram showing the principle of the present invention.

In FIG. 1, two sets of button telephone devices 1 and 2 are shown.

6' denotes an extension line side terminal 13 of the call path switch matrix 11 of one button telephone device 1 and an office line side terminal 2 of the call path switch matrix 21 of the other button telephone device 2.
This is an inter-device connection path that directly connects 2 and 2 without going through a central office line circuit, an extension line circuit, or the like.

Reference numeral 7 denotes a control information transfer path for transferring exchange control information between the control circuit 16' of the key telephone device 1 and the control circuit 26° of the key telephone device 2.

[Effect]

Since the control information transfer path 7 transfers various exchange control information at high speed, the time required for connection across both button telephone devices 1 and 2 is shortened, and the same abundant services as within the same button telephone device are available. can be provided.

Furthermore, since the inter-device connection path 6° connects the communication path switch matrices 11 and 21 without passing through a circuit having a transformer TR, the loss of calls across both button telephone devices 1 and 2 may increase. Prevented.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a diagram showing a connection system between key telephone devices according to an embodiment of the present invention, FIG. 3 is a diagram showing an example of the control information transmission process in FIG. 2, and FIG. FIG. 2 is a diagram showing an example of a command format in FIG. Note that the same reference numerals refer to the same objects throughout the plan.

In FIG. 2, the extension side terminal 13 of the channel switch matrix (SFX) 11 in the button telephone device 1 and the channel switch matrix (SP
The office line side terminal 12 of
CTL) 26' are serial transmission control circuits (S1
0) are connected by the control information transfer path 7 via 18 and 28.

2 to 4, when a call is received from the central office line 3 housed in the key telephone device 1 and the extension 4 performs a predetermined response operation, the cross point (Xll) is closed in the same manner as described above. , the office line 3 and the extension line 4 are connected.

When the central office line 3 wishes to make a call to the extension 5 accommodated in the key telephone device 2, the extension 4 performs a predetermined hold operation, and then
Dial the phone number on extension 5.

It is assumed that the telephone number of extension 4 accommodated in button telephone device 1 and the telephone number of extension 5 accommodated in button telephone device 2 are identified by, for example, a first digit.

The control circuit 16' analyzes the telephone number sent by the extension 4 and selects the extension 5 accommodated in the key telephone device 2 according to the first digit.
As shown in FIG. 4, the inter-device connection path number Np assigned to the inter-device connection path 6' to be used for connection with the key telephone device 2, the command C5 indicating calling, and the calling party number Ns.
(i.e. extension 4 phone number) and calling letter JLiS
s, the called party number Nd (i.e., the telephone number of extension 5) and the called party status Sd, and a command C that includes additional information I if necessary.
The MD is assembled and transmitted to the serial transmission control circuit 18.

The serial transmission control circuit 18 adds an error check code, a start signal STX, and an end signal ETX to the command CMD transmitted from the control circuit 16°, converts it into a serial signal, and sends it to the control information transfer path 7 at high speed. .

In the button telephone device 2, the serial transmission control circuit 28 receives the start signal STX, the command CMD with an error check code, and the new end signal ETX arriving from the control information transfer path 7, and if the result of the error check is determined to be normal, the serial transmission control circuit 28 receives the start signal STX, the command CMD with an error check code, and the new end signal ETX. Confirmation signal A
CK is returned and a command CMD is transmitted to the control circuit 26''.

Further, if the result of the error check is determined to be abnormal, the serial transmission control circuit 28 returns a reception non-confirmation signal NAK and requests the serial transmission control circuit 18 to retransmit.

Based on the command CMD transmitted from the serial transmission control circuit 28, the control circuit 26' identifies the idle state of the extension 5, and if it is free, calls the extension 5, and also calls the extension 5 when the extension 5 is free. Command CM indicating that it is being called
D is created in the same manner as described above, and transmitted to the control circuit 16' via the serial transmission control circuit 28, control information transfer path 7, and serial transmission control circuit 18.

If the extension 5 is busy, the control circuit 26° creates a command CMD indicating that the extension 5 is busy, and transmits it to the control circuit 16'.

Furthermore, when the calling extension 5 answers, the control circuit 26
" creates a command CMD that indicates a response, and
6' and the communication path switch matrix 2.
The cross point X23 in 1 is closed, and the extension 5 is connected to the inter-device connection path 6°.

On the other hand, in the button telephone device 1, the control circuit 16'' informs the extension 4 of the idle busy state of the extension 5 based on various commands CMD transmitted from the control circuit 26 through the control information transfer path 7. etc., and when it is recognized that the extension 5 has responded, the communication path switch matrix 11
Close cross points X15 and X16, and connect extension 4.
is connected to the inter-device connection path 6'.

As described above, extensions 4 and 5 are connected via the extension circuit 15, the inter-device connection path 6°, and the extension circuit 25, and a telephone conversation becomes possible.

When extension 4 and extension 5 notify extension 5 of the incoming call from central office line 3 and perform a predetermined transfer operation, control circuit 16 closes cross point X17 in call path switch matrix 11,
The station '1iA3 and the extension 5 are connected via the office line circuit 14, the inter-device connection path 61, and the extension circuit 25.

As is clear from the above description, according to this embodiment, the exchange control information between the key telephone devices 1 and 2 is exchanged between the control circuit 1
6' and 261 via the control information transfer path 7, the connection time between the key telephone devices 1 and 2 is shortened.

Further, the communication path between extensions 4 and 5 and the communication path between office vA3 and extension 5 include extension circuits 15 and 25 each having a transformer TR, or the office line circuit 14 and the extension circuit. 25 is inserted, and if the connection is made within the same button telephone device 1 or 2, there will be no change in call loss.

Note that FIGS. 2 to 4 are only one embodiment of the present invention, and even if the control circuit 16 is connected via the control information transfer path 7,
The exchange control information transferred between the camp-on and 26' is not limited to simple connection control;
Although various services such as message sending/receiving and busy calling are considered, the effects of the present invention remain the same in either case.

Furthermore, the present invention is not limited to the provision of a single inter-device connection path 6' between the button telephone devices 1 and 2, and a plurality of connection paths 6' may be provided, but the effects of the present invention do not change even in such a case. . Furthermore, the present invention is not limited to those in which two sets of button telephone devices 1 and 2 are installed in the same premises;
It is also contemplated that three or more sets of button telephone devices may be interconnected by an inter-device connection path and a control information transfer path;
Even in such a case, the effects of the present invention remain unchanged.

〔Effect of the invention〕

As described above, according to the present invention, various exchange control information is transferred at high speed via the control information transfer path, so the time required for connection across multiple key telephone devices is shortened, and a variety of exchange services are provided. can be realized between multiple key telephone devices.

In addition, the communication path spanning multiple button telephone devices is connected to the transformer TR.
Since the communication path is set between the communication path switch matrices without passing through a circuit having a communication path, an increase in communication loss is prevented.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a diagram showing a connection system between key telephone devices according to an embodiment of the present invention, and FIG. 3 is a diagram showing an example of the control information transmission process in FIG. 2. , FIG. 4 is a diagram showing an example of the command format in FIG. 3, FIG. 5 is a diagram showing an example of a conventional connection system between key telephone devices, and FIG. 6 is a diagram showing an example of the office line circuit in FIG. 5. figure,
FIG. 7 is a diagram showing an example of the extension circuit in FIG. 5. In the figure, 1 and 2 are key telephone devices, 3 is a central office line,
4 and 5 are extension lines, 6 and 6' are inter-device connection paths, 7 is a control information transfer path, 11 and 21 are speech path switch matrices (SPX), 12 and 22 are office line side terminals,
13 and 23 are extension side terminals, 14 and 24 are office line circuits (COU), 15 and 25 are extension circuits (LC), 1
6.161.26 and 261゛ are control circuits (CTL)
, 17 and 27 are private line circuits (PVU), 1 B
and 28 is a serial transmission control circuit (SIO), ACK is a reception confirmation signal, C is a command, CMD is a command, ETX is an end signal, ■ is additional information, NAK is a reception non-confirmation signal, Nd
is the called party number, Np is the inter-device connection number, Ns is the calling party number, Sd is the called party state, Ss is the calling party state, STX is the start signal, and Xll/? :zg early 2. The outside of the figure is I; no P (Sakura Kenryoden Kenbeo! Number 3 Figure Qin 31 S-frame to drink with the sword //- Seven Heka + Figure

Claims (1)

[Claims] A central office line circuit (14, 24) is connected to one terminal (12, 22) of a communication path switch matrix (11, 21),
In a plurality of button telephone devices (1, 2) connecting extension circuits (15, 25) to the other terminals (13, 23), the communication path switch matrix (11) of one of the button telephone devices (1) An inter-device connection path (6') is provided for connecting the extension side terminal (13) and the office line side terminal (22) of the communication path switch matrix (21) of the other button telephone device (2), and the above-mentioned The control circuit (16) of one button telephone device (1)
') and a control circuit (
26') is provided with a control information transfer path (7) for transferring exchange control information.