JPS61150595A - Hooking identifying system of key telephone system - Google Patents

Abstract

PURPOSE:To identify without fail whether loop releasing is due to the hooking of the telephone system or the cause of the exchange side by connecting the line wire by a holding circuit in accordance with the loop releasing detecting output while the line wire is caught, changing over and connecting the telephone set, which is catching the line wire, through a loop detecting means to an electric current supplying circuit and identifying a hooking control of the telephone set in accordance with the detecting condition by the loop detecting means after changing-over and connection are executed. CONSTITUTION:A telephone set TWST4 (a) executes the off-hooking, an FTR reaches while a line wire 1 is caught, the loop (f) of the line wire 1 is turned off, and then, a detecting output (b) of a loop detecting circuit LPD12 occurs as off in accordance with this, a control circuit CNT16, which receives this, drives relays I (d) and H (e) after t1, connects a holding circuit HLD11 to the line wire 1, obtains the holding condition, and changes over and connects the TWST4 through a LPD12 to a call signal generating circuit RSG13 by a contact (i). Thus, a loop electric current at an IWST4 side is energized, in accordance with this, a detecting output (b) is turned on, the CNT16 stops the driving of the relay I (d) after the time t1, further, stops the driving of the relay H (e) after a delay time t3 passes and connects the TWST4 to the line wire 1 again.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a system for distinguishing a hooking operation of a telephone connected to a main device via a telephone line from a loop opening caused by an operation on the exchange side. It is something.

[Conventional technology]

The button telephone device includes a two-wire standard telephone (hereinafter referred to as TV
ST), and a button telephone device that accommodates such a TWST is disclosed in Japanese Unexamined Patent Publication No. 1983-92694 filed separately by the present applicant. During a call with TWST,
When setting a hold state for an outside line and transferring it to another key telephone (PBST), the TWST sends specific information to the main device, which is detected by the main device and responds by setting the hold state. As this specific information, a method has been proposed that uses TWST hooking to open a call loop.

[Problem that the invention seeks to solve]

However, some exchanges in foreign countries may cause a momentary interruption of the call loop when connecting to the exchange in response to the completion of a dial call, and some exchanges may cause a call loop to be interrupted when the first digit of the area number is dialed. FTR (Fleeting Te5t), which inverts the line voltage of central office lines, is used to identify whether long-distance calls are restricted on the telephone side.
Reversal) and pseudo-opening the loop, and opening the loop based on these also causes T.
This causes a problem where the hooking is mistakenly recognized as a hook by WST, and the pending state is unexpectedly set.

[Means for solving problems]

In order to solve the above-mentioned problem, the present invention is constructed by the following means.

That is, in the above-mentioned button telephone device, in response to the loop open detection output from the loop detection means that is capturing an outside line, the outside line is connected to the holding circuit, and the telephone that is capturing the outside line is connected to the current supply circuit via the loop detection means. Switch and connect,
The hooking operation of the telephone is identified according to the detection status of the switching connection edge by the loop detection means.

[Effect]

Therefore, when the loop becomes open and the loop detection means detects this, the hold circuit is connected to the outside line, the outside line is placed on hold, and the current supply circuit is connected to the telephone side via the loop detection means. Therefore, if the loop detecting means detects an opening of the loop at this time, it means that the telephone is on-hook), and it can be identified as a loop opening due to hooking. On the other hand, if a loop closure is detected, it indicates that the loop has been opened by the exchange side. can be identified.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to figures showing examples.

FIG. 2 is a block diagram showing the entire configuration. A main unit (hereinafter referred to as KSU) 2 that accommodates an outside line 1 such as a central office line from a central office or a telephone line from a private branch exchange has a pair of call # 3
TWST4 is connected to the PBST4 via each pair of communication lines 5a to 5d and signal lines 6a to 6d.
ST7a-7d are connected to each other, and in KSU2, a holding circuit (hereinafter referred to as HLD) 11 is connected to outside line 1 via the contact of holding relay H. and a contact 11 of a sending relay I for sending each signal to TWST4, and a loop detection device for detecting a call loop caused by TWST4. A circuit (hereinafter referred to as LPD) 12 is inserted.

Also, on the make pole side of contact l, 16H is connected to TWSTi via contact bu of sending relay BU for sending out busy tone.
A calling signal generation circuit (hereinafter referred to as R8) that sends out a calling signal of
G') 13 is connected, and a busy tone generating circuit 14 for transmitting a busy tone to the TWST 4 is connected to the make pole side of the contact bu.

On the other hand, the communication lines 5a to 5d on the PBSTs 7a to 7d side are
External line 1 via contact faxfd of switching relay FA-FD
It is designed to be connected to each switching relay F.
In the operating state of A-FE, the circuits of TWST4 and PBST7a to 7d are used as extension circuits (
A control circuit (hereinafter referred to as CNT) 16 including a processor such as a microprocessor and memory is connected to PBSTs 7a to 7d via a transmission circuit 1T and signal lines 61 to 6d. In addition to transmitting and receiving control data and operation data, the LPD
12 detection outputs and data indicating the situation from INL 15, control decisions are made according to the detection output of HLDll,
Controls R8G13, INL15, each relay FA-BU via drive circuit 18, and ringing tone generation circuit 19,
An exchange connection is being made.

The general operating condition is as per the above-mentioned Japanese Patent Application Laid-Open No. 59-926.
This is disclosed in Publication No. 94.

FIG. 3 is a timing chart showing the operation status of each part in FIG. 2. TWST4(a) goes off-hook, FTR arrives while it is capturing outside line 1, and loop (r) of outside line 1 is turned off. In response, the detection output (b) of the LPD 12 is turned off, and the CN that received it
T16 drives relay 1 (d) and H (e) after a non-response time t1 of, for example, 100 to 150 m5eC,
HLDI 1 is connected to outside line 1 to put it on hold, and TWST 4 is switched and connected to R8013 via LPD 12 depending on the amount of contact.

At this time, the R8G13 does not send out the calling signal, but the local power supply to be superimposed on the calling signal is supplied, so that the loop N? is sent to the IWST4 side.
+ is connected, and in response, the detection output (b) is generated as on, and the CNT 16 will start from time 1.
After stopping the driving of relay I (d), furthermore,
For example, after a delay time t3 of 100 m5ec has elapsed, driving of the relay H(s) is stopped and the TVST 4 is connected to the outside line 1 again.

However, since FTR continues for several 100 m5ec,
During this time, for the purpose of not repeating the above operation, relay 1 (
It is assumed that the CNT 16 ignores the change in the detection output (b) during a prohibition time t4 of, for example, 1 sec after the driving is stopped in d).

Therefore, after driving relay I (d) and switching and connecting the TWSTJ side to R8G13 as a current supply circuit, the loop is opened depending on the state of the detection output (b).
If the detection output (b) is off even after switching connection, it can be determined that the hooking operation is caused by TVST4 hooking. can.

Also, the loop opening time due to hooking is, for example, 02
~l, Only those that match within the specified time 'rs of Q Sec are judged as legitimate hooking, and a pending state is set accordingly.In this case, the detection output (b
), the off time T LOF is less than the specified time 'rs, the normal hold state will not occur.

Figure 1 is a flowchart of the control status by the processor in CNTlS, and relay "FE drive stopped" 1
It is assumed that outside line 1 is being captured by TVST 4 of 01, and dial pulses are not detected, so for example,
1 loop open to ignore less than? '102 detected output (
Judging according to b), if this is Y (YES),
After performing relay "H drive #111 and 1 ■ drive" 112, connecting HLD 11 to outside line 1, and switching connection of TVST4 side to R5G13, check "Loop open?" 121 again according to detection output (b) K. If this is N (No), TVST4 is off-hook.
The relay "H, I drive stop" 122 connects the TVST4 to the outside line 1 again, and the l1t4 timer configured in the processor for regulating the prohibition time t4 is started.
131, t.

Timer time up? ” 132 becomes Y, steps 102 and subsequent steps are repeated.

If step 121 is Y, the TVST4 is on-hook, and in order to monitor this time, the @t5 timer start "141" configured in the same manner as described above, for example, with a set time t5 of 1 limit is performed. , detection output (b
) 1 loop is closed according to ? ``142 is checked, and if this is Y, 1 hooking?'' 151 is identified based on whether the time from step 121 to 142 is before the time-up of the t4 timer and is greater than or equal to 0.2 See. 0゜2~l, If it coincides with the specified time 'rs of Q Sec and becomes Y, 1 hold is completed'', whereas when step 151 is N, it is incomplete hooking with TLOF < TS, The TVST4 is connected to the outside line 1 by the relay "H, I drive stop #152, and steps 102 and subsequent steps are repeated.

On the other hand, when step 142 is N, "t5 timer
Time up? While "161 is N, step 142 and subsequent steps are repeated. If step 161 is Y, it is determined that TVST4 is on-hook due to the end of the call, and relay "FE drive/
H, I drive stop ``162'' releases outside line 1 and ends call 1.

Therefore, in response to the detection of loop opening in step 102, HLD is sent to outside line 1 in steps 111 and 112.
ll is connected, TVST4 is switched to R2O13, and 11.11 from R2O13 is connected. According to the decision made in step 121 by the a supply, the loop is opened when the TVS
It is possible to identify whether it is due to T4 hooking or not.

Therefore, when Step 121 is N, the loop is opened on the FTR or exchange side, and the call can be continued by repeating Step 102 and after, and Step 121 is Y.
Even if step 151 is N, the same applies.
In response to Y in the snap 151, a hold state is set, while if the TVST 4 is on-hook due to the end of the call, the outside line 1 is released in step 162, and the exchange is restored.

In addition, the time it + i3 + TLOF< in Fig. 2
Regulation and determination of 'rs etc. is performed by a timer in the processor in the relevant steps of FIG.

However, for each time t+ + t3 to t5+ TS, etc.,
It may be determined according to the conditions, and the same applies to not only the hooking of TWST4 but also the hooking operation of PBS77m-7d. Hooking can also be used as specific information indicating other operations in addition to reservation information.

In addition, loop opening by the exchange side is not limited to when dialing, but it is optional to deal with various causes such as loop opening after receiving a call, and when using a composite audio frequency signal as a dialing signal. can also be applied.

Note that each timer may be provided separately, and the configuration shown in FIG. 2 can be arbitrarily selected according to the situation, and in FIG.
Various modifications are possible, such as replacing the steps with other equivalent steps or omitting unnecessary steps.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, it is possible to reliably identify whether the loop opening is due to hooking of the telephone or the cause on the exchange side. You can get the following effect.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Figure 1 is a flowchart of the control situation, Figure 2 is a block diagram of the entire configuration, and Figure 3 is a flowchart of the control situation.
3 is a timing chart showing the operation status of each part in the figure. 1...External line, 2...KSU (main unit), 3
, 51~5d lI fist 1111 telephone line, 4------
TWST (standard telephone), 7&~7d...PBST
(key telephone), 11...HLD (hold circuit)
, 12...LPD (loop detection circuit), 13...
・ψR8G (Call signal generation circuit: current supply circuit), 1
6 fists...CNT (control circuit), FA-FE, I
, )I. BU 11 @ @ 11 relay, f aA-f @
+ l Hb + b u ”Φ...Contact.

Claims (1)

[Claims] In a button telephone device, in which a loop detection means detects a hooking operation of a telephone connected to a main device via a telephone line, and responds to this as specific information, in response to a loop opening detection output from the loop detection means during an outside line acquisition. , connecting an outside line to a holding circuit, switching and connecting the telephone that is capturing the outside line to the current supply circuit via the loop detection means, and hooking the telephone according to the detection status by the loop detection means after the switching connection; A hooking identification method for a button telephone device characterized by identifying operations.