JP2586828B2 - Facsimile internal / external line switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal / external line switch for switching a facsimile apparatus between an internal line connected to a private branch exchange (PBX) or the like and an external line connected to a central office exchange.

[0002]

2. Description of the Related Art Conventionally, this type of internal / external line switch has a configuration as shown in FIG. 4, and uses a dial number shown in FIGS. 13 is called. The operation is as follows.

(1) When a call is made to the station 14 via the outside line 13; first, in FIG. 4, a facsimile (FAX) 1 grasps the line 2 of the switch. At this time, since the line switching relay (RL) 10 has fallen to the outside line 13 from the beginning, the dial numbers A and F of FIG.
B, C, D, E, F, G, and H are output to the outside line 13 as they are, and the line connection operation is performed (FIG. 3A). Here, A, B, C, D, E, F, G, and H indicate any of numbers 0 to 10.

(2) When a call is made to the PBX 12 via the extension 11; as in (1), when the facsimile 1 grasps the line 2 of the switch, the line switching relay (RL) 10 grasps the outside line 13. Then, from facsimile 1
When a special number (switching digit X) for instructing switching to the extension is received by the dial shown in (d), if the dial from the facsimile 1 is a dial pulse system, a loop detection circuit (LP-DET) 4 and a push-phone dial system In the case of (1), X is detected by the MF detection circuit (MF-DET) 6, and the relay control circuit (RL-CONT) 9 switches the line switching relay (RL) 10 so that the external line 13 connected to the facsimile is switched to the internal line 11. Control. In this case, the switching digit X
Has already been sent to the outside line 13 before switching to the extension.

When the line is switched to an extension, the dial numbers (I, J, K, L, M, N) after the switching digit are sent to the extension (PBX) side, and the line connection operation of the extension is performed (FIG. 3).
(B)). Here, I, J, K, L, M, and N are numbers 0 to
10 shall be indicated.

(3) When an incoming call is received; When there is an incoming call from the extension 11 or the outside line 13, a ringer signal is detected by a ringer detection circuit (IR-DET) 20 or 21, and if the facsimile 1 is free, the line is Is connected to the facsimile 1. If the facsimile 1 is in use, it ignores the incoming call later or returns a busy tone.

[0007]

In this conventional internal / external line switch (hereinafter referred to as a switch), the line of the facsimile 1 is always connected to the outside line in the initial state according to the request of many users. When a call is made to an extension, the facsimile always captures the outside line once the line is grasped, outputs a switching digit to the outside line, releases the outside line, and switches to the inside line. Therefore, there is a problem that an invalid call is made to an external line by a switching digit before switching to an internal line.

[0008] Further, since the switching digit is viewed using only one digit of the dial number, there is a drawback that the connection is erroneously made when the switching digit number coincides with the head of the telephone number of the outside line. In order to solve this problem, if different switching digits are assigned to the extension and the outside line, the speed dial or the one-touch dial registered before the installation of the switch may not be used.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a facsimile internal / external line switching device in which a switching digit is not transmitted to an outside line even when an extension is called, and a switching digit number can be freely set.

[0010]

According to the present invention, there is provided a facsimile internal / external line switch for connecting a line connected to a facsimile to either an internal line or an external line to a central office via a line switch. A dial signal detecting circuit for detecting a dial from a line, a pause detecting circuit for detecting whether there is a specific pause after a switching digit for identifying an extension from the dial signal detected by the dial signal detecting circuit, and a switching digit A dial number memory storing dial number information excluding, when the switching digit and the subsequent specific pause are detected, the line switch is connected to the extension side,
When at least one of the switching digit and the specific pause is not detected, a switching control circuit for connecting the line switch to the outside line side, and a dial signal is generated based on the dial number stored in the dial number memory. A facsimile internal / external line switch including a dial generation circuit for sending a dial signal to the extension or the external line switched in step (1).

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a circuit diagram showing an embodiment of the present invention. In the figure, the switch of the present embodiment connects a line 2 of a facsimile (FAX) 1
It is connected to either the extension 11 of the BX 12 or the outside line 13 of the central office 4. When a call is made to an outside line, the facsimile 1 has ordinary dial number information A, B, C, D, E, F, G, H (from A to H) as shown in FIG.
Is a number from 0 to 9), and when dialing the extension 11, dial numbers I, J, K, L, M, N (see FIG. 2D) following the switching digit X. X, I to N are numbers from 0 to 9). In addition, a predetermined pause (for example, 3 seconds) between the switching digit X and the dial number I for guaranteeing extension dial reception.
Shall enter. This pause is used when recognizing that the switching digit X is not for a normal dial number but for an extension call.

The switch comprises a loop detection circuit 4 for detecting a dial from the facsimile 1 and a PB signal detection circuit 6
And a pause section timing circuit 7 for counting the pause time between each dial number from the outputs of the loop detection circuit 4 and the PB signal detection circuit 6, and storing dial number information excluding the switching digit X every time the pause section is counted. The line switching relay 10 is connected to the extension 11 when the dial number memory 8 to be switched, the switching digit X and the subsequent 3-second pause are detected, and if either the switching digit X or the 3-second pause is not detected, the line switching is performed. Relay control circuit 9 for connecting relay 10 to outside line 13
After the line switching relay 10 is switched, a dial signal is generated based on the dial number stored in the dial number memory 8.
6, a dial generation circuit 15 for controlling the PB signal transmission circuit 18 and, in the case of an outside line dial, controlling the dial relay 17 and the PB signal transmission circuit 19 to transmit a dial signal to the extension 11 or the outside line 13.

Whether the dial input to the dial generating circuit 15 is an extension or an outside line is notified by the relay control circuit 9. By storing an identifier for identifying the extension and the outside line in the dial number memory 8 together with the dial number, ,
It may be determined whether the dial generation circuit 15 is an extension or an extension.

Switches di of dial relays 16 and 17
1 and di2 are the ringer detection circuits 2 in the standby state.
It is connected to 0,21 and is waiting for an incoming call.

In the above configuration, the pause time after the switching digit X may be longer than the pause time between normal dial numbers.

Next, the calling operation will be described.

When the line 2 of the switch is closed for the facsimile 1 to make a call, the facsimile 1
The facsimile 1 is notified by a signal from the pseudo dial tone generation circuit 5 that the loop detection circuit 4 detects that the facsimile loop is closed.

When the facsimile 1 sends an outside line number as shown in FIG. 2C, if the pulse of that number is a dial pulse, it is detected by the loop detection circuit 4 and if it is a push button dial, it is detected by the PB signal detection circuit 6, The pause section timing circuit 7 stores the dial number information in the detected dial number memory 8 after measuring the time between each dial digit. In this case, the switching digit X is not stored. The relay control circuit 9 checks whether the first digit of the dial number matches the pre-registered extension switching number and whether there is a pause section of a specified time of 3 seconds after that, and checks the above two conditions. Is established, the line switching relay 10 is switched to the extension side 11, and the line is connected to the PBX 12. If even one of the above conditions is not satisfied, the line switching relay 10 is switched to the outside line 13 and the line is connected to the central office 14.

After the line to which the facsimile 1 is to be connected is determined, dial information is sent from the detected dial number memory 8 to the dial generating circuit 15, and under the control of the dial generating circuit 15, a dial relay 16 or 17. In the case of a push button line, the PB signal is transmitted from the PB signal transmission circuit 18 or 19 with the information of the dial number shown in FIG.

As an incoming call operation, in the case of an incoming call to the extension 11, the ringer detecting circuit 20 is connected via the switch di1.
When an incoming call arrives at the outside line 13, the ringer is detected by the ringer detection circuit 21 via the switch di2.
Next, the use state of the facsimile 1 is checked by the loop detection circuit 4, and if it is free, the ringer detection circuits 20 and 21 switch the line switching relay 10 to the incoming line side, and output the ringer signal from the ringer generation circuit 22 to perform the facsimile. Start 1

In the above embodiment, the internal / external line switching condition is set to include the predetermined pause time after the switching digit X.
Even if the switching digit matches the leading number of the outside line dial, no specific pause (3 seconds) is detected after the number, so that the leading number of the outside line is not recognized as the switching digit X. In addition, only dial numbers are sent to internal and external lines,
No meaningless numbers are sent.

In the embodiment, when the facsimile 1 sends out a push button signal for calling an extension,
The switching digit X is not a number from 0 to 9, but an asterisk (*)
The information at the time of pressing the button may be used.

[0024]

As described above, according to the present invention, (1) a dial is temporarily stored in a memory, analyzed, and then any one of internal and external lines is grasped. There are no invalid calls to make a meaningful dial,
(2) Since the switching condition includes the pause after the switching digit, the line can be switched even with the DP system line (no # or *) even if the switching digit matches the first dial number of the outside line. (3) Since one line does not require a switching digit, there is a result that the speed dial or one-touch dial registered from the time when the switching function was not provided can be used without being changed.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of the present invention.

FIG. 2 is a diagram showing the order of dial numbers, where (a),
(C) is an outside line number, (b) is an extension number (no switching digits),
(D) is an extension number (switching digit added).

FIGS. 3A and 3B are schematic explanatory diagrams for comparing a calling operation between a conventional switch and an embodiment of the present invention, wherein FIG. 3A shows a call to an outside line, and FIG.
Fig. 3 shows the operation of the conventional switch, and Fig. 3C shows the operation of the embodiment of the present invention.

FIG. 4 is a block diagram of a conventional switch.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 facsimile 2 switcher line 3 power supply circuit 4 loop detection circuit 5 pseudo dial tone generation circuit 6 PB signal detection circuit 7 pause section timing circuit 8 detection dial number memory 9 relay control circuit 10 line switching relay 11 extension 12 PBX 13 outside line 14 station Switch 15 Dial generation circuit 16, 17 Dial relay 18, 19 PB signal transmission circuit 20, 21 Ringer detection circuit 22 Ringer generation circuit

Claims (3)

(57) [Claims] 1. A facsimile internal / external line switch for connecting a line connected to a facsimile to one of an extension and an external line to a central office via a line switch, wherein a dial signal for detecting a dial from the facsimile line. A detection circuit, a pause detection circuit that detects whether there is a specific pause after the switching digit from the dial signal detected by the dial signal detection circuit, and a dial number memory that stores dial number information excluding the switching digit, The line switching device is connected to the extension when the switching digit and the specific pause following it are detected, and the line switching device is connected to the external line when at least one of the switching digit and the specific pause is not detected. A switching control circuit for generating a dial signal based on the dial number stored in the dial number memory; Facsimile out line switching unit including a dial generating circuit to said internal or said external switched by the line selector sends a dial signal. 2. The method according to claim 1, wherein the pause detection circuit measures a pause time between each dial number of the dial signal from the dial detection circuit, and detects whether the pause time is the specific pause. A facsimile internal / external line switch according to claim 1. 3. A ringer detection circuit for detecting an incoming call is connected to each of the extension and the outside line, and the line switch is switched to the extension or the outside line on which the incoming call is detected. A facsimile internal / external line switch as described in 1.