JPH0310277B2 - - Google Patents

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]

Some telephone exchange equipment accommodates two-wire standard telephones (hereinafter referred to as TWST),
A button telephone device that accommodates TWST is disclosed in Japanese Patent Laid-Open No. 59-92694 filed separately by the present applicant,
During a call using TWST, when setting a hold state for an outside line and transferring it to another key telephone (hereinafter referred to as PBST), TWST sends specific information to the main device, which is detected by the main device. A hold state is set in response, and a method has been proposed that uses TWST hooking to open a call loop as this specific information.

[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 dialing, and some exchanges may cause a momentary interruption of the call loop when dialing the first digit of the area number. For the purpose of identifying whether long-distance call restrictions are being implemented on the telephone side of the terminal, FTR (Fleeting Test Reversal), which inverts the line voltage of the central office line, is sent out.
There are loop openings that occur in a pseudo manner, and loop openings based on these may also be mistaken for hooking due to TWST, resulting in a problem in which the pending state is unexpectedly set.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention is constituted by the following means.

That is, in the above-mentioned telephone exchange 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. The telephone is switched and connected, and the hooking operation of the telephone is identified according to the loop opening detection output of the loop detecting means within a certain period of time after the switched connection.

[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 detection means detects the closure of the loop within a certain period of time after this switching connection, it can be identified as a loop open on the exchange side, but if the loop closure cannot be detected within this time, the telephone is in an on-hook state, and can be identified as a loop opening due to hooking.

〔Example〕

Hereinafter, details of the present invention will be explained with reference to figures showing examples.

FIG. 2 is a block diagram showing the entire configuration. The main unit (hereinafter referred to as KSU) 2 accommodates an external line 1 such as a central office line from a central office or a telephone line from a private branch exchange.
The TWST 4 is connected to the PBST 4 through a pair of communication lines 3, and the PBSTs 7a to 7d are connected to each other via a pair of communication lines 5a to 5d and signal lines 6a to 6d.
is connected, and within KSU 2, a holding circuit (hereinafter referred to as HLD) 11 is connected to outside line 1 via contact h of hold relay H, while communication line 3 of outside line 1 is connected to In between, the contact fe of the switching relay FE for external calls and internal calls, TWST
A contact i of a sending relay I for sending each signal to the TWST 4, and a loop detection circuit (hereinafter referred to as LPD) 12 for detecting a call loop caused by the TWST 4 are inserted.

Furthermore, a ringing signal generation circuit (hereinafter referred to as RSG) 13 is connected to the make terminal side of contact i, which sends out a 16Hz ringing signal to TWST4 via contact bu of sending relay BU for sending busy tone. A busy sound generation circuit 14 for transmitting a busy sound 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 PBST7a to 7d side
are connected to the outside line 1 through the contacts fa to fd of the switching relays FA to FD, and in the operating state of each switching relay FA to FE,
The circuits of TWST4 and PBST7a to 7d are connected to an extension circuit (hereinafter referred to as INL) 15 for internal telephone calls, and a control circuit (hereinafter referred to as
CNT) 16 is connected to the transmission circuit 17 and the signal line 6a
-6d to transmit and receive control data and operation data to and from PBST7a to 7d, and LPD
The HLD
11, RSG 13, INL 15, the relays FA to BU via the drive circuit 18, and the ring tone generation circuit 19 are controlled and exchanged.

The general operating condition is based on the above-mentioned JP-A-59-
As disclosed in Publication No. 92694.

Figure 3 is a timing chart showing the operating status of each part in Figure 2. TWST4(a) performs off-hook, FTR arrives while it is capturing outside line 1, and loop (f) of outside line 1 is turned off. In response to this, the detection output (b) of the LPD 12 is turned off,
The CNT16 that received this is, for example, 100 to 150 m long.
Relay (d) and H(e) after unresponse time t ₁ of sec
, connect HLD11 to outside line 1 and put it on hold, and connect TWST4 via LPD12.
Switch connection to RSG13 using contact i.

In this case, the RSG 13 does not send out a calling signal, but the local power is supplied to be superimposed on the calling signal.
A loop current passes to the TWST4 side, and in response, the detection output (b) is turned on.
After time t ₁ from now on, CNT 16 transmits relay I(d).
In addition to stopping the driving of the relay H(e) after a delay time _t3 of, for example, 100 msec has elapsed, the TWST4 is connected to the outside line 1 again.

However, since FTR continues for several 100 msec,
For the purpose of not repeating the above-mentioned operation during this period, the CNT 16 ignores changes in the detection output (b) for a prohibition time _t4 of, for example, 1 second after the drive of the relay I(d) is stopped.

Therefore, by driving relay I(d), TWST4
After switching and connecting the side to RSG13 as a current supply circuit, the loop may be opened depending on the status of the detection output (b).
Is it due to TWST4's footing, or
It is now possible to determine whether the operation is based on the operation on the exchange side, and if the detection output (b) is off even after switching connection, it can be identified that it is a hooking operation of TWST4.

In addition, the loop opening time due to hooking is determined to be legitimate only if it matches within the specified time T _S of, for example, 0.2 to 1.0 seconds, and a pending state is set accordingly. is the time T when the detection output (b) turns off. _LOF is the specified time T _S
If the number is less than 1, it will not be in a regular pending state.

FIG. 1 is a flowchart of the control situation by the processor in the CNT 16, and assumes that the TWST4 of the relay "FE drive stopped" 101 is capturing the outside line 1, and since no dial pulse is detected,
For example, “Loop open?” that ignores less than 100msec.
102 is determined according to the detection output (b), and this is Y.
(YES), perform the relay “H drive” 111 and “I drive” 112, connect the HLD11 to the outside line 1, switch the TWST4 side to the RSG13, and then repeat the “H drive” 111 and “I drive” relays according to the detection output (b). Loop open?” Check 121. If this is N (NO), TWST4 is off-hook, and relay “H,
"I drive stop" 122 connects TWST4 to outside line 1 again, and "t ₄ timer start" 131 is configured in the processor for regulating the prohibited time t ₄ .
, and when " _t4 timer time up?" 132 becomes Y, steps 102 and subsequent steps are repeated.

Further, if step 121 is Y, it means that TWST4 is on-hook, and in order to monitor this time, perform " _t5 timer start" 141 having a set time _t5 of 1 sec, for example, configured in the same manner as described above. Then, check "Loop closed?" 142 according to the detection output (b), and if this is Y, check whether the time from steps 121 to 142 is before the time-up of the ₄ timer and is 0.2 seconds or more. 151 is identified, and this is 0.2 to 1.0 sec.
If it coincides with the specified time T _S and becomes Y, the hold is completed, whereas if step 151 is N,
T _LOF < T _S is incompletely hooked, and TWST4 is set to outside line 1 by relay “H, I drive stop” 152.
, and repeat steps 102 onwards.

On the other hand, when step 142 is N, while " _t5 timer time up?" 161 is N, step 142 is
Repeat the following steps, and if step 161 is Y, TWST
4 is judged to be on-hook due to the end of the call, and relay ``FE drive/H, I drive stop'' 162 is activated to switch outside line 1.
is released and the story ends.

Therefore, in response to the detection of loop opening in step 102, the line is connected to outside line 1 in steps 111 and 112.
When HLD11 is connected, TWST4 is connected to RSG1
According to the judgment status of step 121 based on the current supply from RSG 13, it can be determined whether the loop opening is due to hooking of TWST 4 or not.

Therefore, when step 121 is N, the loop is opened on the FTR or exchange side, and step 102
The call can be continued by subsequent repetitions, and even if step 121 is Y, if step 151 is N, the same holds true; if step 151 is Y, the call will be placed on hold, but when the call ends, TWST4 If on-hook is performed, outside line 1 is released in step 162, and the exchange is restored.

Note that the regulation and determination of times tz, t ₃ , T _LOF < _TS, etc. in FIG. 3 are performed by a timer in the processor in the related steps in FIG. 1.

However, each time t ₁ , t ₃ to t ₅ , T _S , etc. may be determined according to the conditions, and the same applies not only to the TWST4 footing but also to the PBST7a to 7d footing operations. In addition to reservation information, it can also be used as specific information indicating other operations.

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

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. You can replace the steps with the above steps or omit unnecessary steps.
Various modifications are possible. Next, FIGS. 4 to 6 are timing charts illustrating in detail the hooking identification method of the present invention. Figure 4 shows the detection timing of a normal hooking operation, Figure 5 shows the FTR detection timing when the outside line is released by the FTR signal from the exchange, and Figure 6 shows the detection timing when the call is terminated by an on-hook. It shows the end of call detection timing. This telephone exchange equipment constantly monitors whether the loop is off (loop opening), and when it detects the loop off, it drives relays I and H after time t ₁ (100ms), and
If the loop is detected again after t ₁ (100ms) and it is on (loop closed) as shown in Figure 5b, it is determined that the loop has been opened by the FTR signal on the exchange side, and relay I is activated. , H are stopped, and if they are turned off (loop open) as shown in FIG. Approximately one second after this determination, loop detection is performed again, and if the loop is on at this time, it is determined that hooking has occurred, and if it is off, it is determined that the call has ended.

〔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 on the telephone or the cause on the exchange side. Effects can be obtained.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is a flowchart of the control situation, Fig. 2 is a block diagram of the entire configuration, Fig. 3 is a timing chart showing an outline of the operating situation of each part in Fig. 4 to 6 are timing charts showing detailed operating conditions of each part in FIG. 2. 1...External line, 2...KSU (main unit), 3,5a
~5d...Talking line, 4...TWST (standard telephone),
7a-7d...PBST (key telephone), 11...
HLD (holding circuit), 12...LPD (loop detection circuit), 13...RSG (calling signal generation circuit: current supply circuit), 16...CNT (control circuit), FA~FE,
I, H, BU...Relay, fa~fe, i, h, bu...
…contact.

Claims (1)

[Claims] 1 Detecting a hooking operation of a telephone connected to the main device via a telephone line, using a loop detection means,
In a telephone exchange device that responds to this as specific information, in response to the loop open detection output from the loop detection means that is capturing an outside line, connects the outside line to a holding circuit and connects the telephone that is capturing the outside line via the loop detection means. switch to the current supply circuit,
A hooking identification method for a telephone exchange apparatus, characterized in that a hooking operation of the telephone is identified according to a loop opening detection output of the loop detecting means within a certain period of time after the switching connection.