JPS60246162A - Called party advanced hook-on and forced cut circuit - Google Patents

Abstract

PURPOSE:To improve the utilizing efficiency of a line and to prevent ineffective registration by stopping the charging registration of a 5-count circuit at the count state after a called party advanced hook-on is detected in a charging trunk, using a prescribed period of pulse as a forced cut supervisory time and using a periodical pulse to apply forced cut at the called party advanced hook- on. CONSTITUTION:The circuit consists of the 5-count circuit comprising PA-PE relays, a charging registration relay (M relay), a called party response supervisory relay (E relay), a called party response memory relay (CH relay), a line hold relay (CO relay) and a called party advanced hook-on detection relay (COA relay). Moreover, a detour prevention diode D and prescribed period pulse supply terminals PU, AL are provided. The COA relay is operated through the incoming of a prescribed period pulse PU so as to detect the advanced hook-on of the called party. Further, the charging registration is conducted by the operation of the M relay according to an L pulse and as the operating condition, the M relay is activated by the operation of the 5-count relays PA-PE, that is, the PA relay operation and PB relay operation.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a telephone exchange, and more particularly to a circuit in which a called party is initially called in a charging trunk based on a charging (distance-based time difference) system.

The K billing method is a method in which frequency registration time intervals are determined according to the distance between callers, and frequency registration is performed at the time intervals during the call. In this charging trunk, when the called party detects this condition, it forcibly disconnects the line.
A busy tone is returned to the previous subscriber and charge registration is stopped. In conventional charging trunks, there are two known methods for disconnecting the line: a method of setting a fixed tension monitoring time, and a method of using a charging band pulse (K). Both methods are explained below.

Figures 1 to 3 are diagrams for explaining the method of setting the termination monitoring time. Figure 1 is a diagram of the forced function program for calling the called party first, and Figure 2 is an example of the termination circuit. FIG. 3 is a circuit diagram illustrating the callee's caller's suspension detection and suspension recovery operations, respectively.

The 5-counting circuit in the charging trunk is KG-enabled in order to perform accurate 9-charging, and has the function of counting 5 pulses supplied via the charging link and sending one registered pulse to the preceding station for every 5 counts. It is composed of p, PA to PE relays.

In addition to these five counting circuits, the charging trunk also includes a charging registration relay (
M relay), called party response monitoring relay (E relay), called party response memory relay (CH relay), line holding relay (
Co relay), and the called party is connected to the detection relay (COA
relay).

Further, pulses with a period of 10 to 20 seconds are received at the PU and AL terminals, and this is used as the full monitoring time.

When the called party enters the first call state, the E-relay is restored,
By keeping the CH relay operating in the state where the called party has already answered, the COA relay is activated and the COA relay is activated when the PU pulse of 10 seconds is received in this case, and the AL pulse of 10 seconds is received. Then open the CO relay and perform a forced recovery. If the called party calls again within the deadline monitoring time, E
By restarting the relay, the above-mentioned COA relay is restored and the caller's detection is canceled.

However, since this method requires a long termination monitoring time, the line is held invalid and charges are registered within the termination monitoring time, which may result in invalid registration.

Next, a stressing method using pulses will be explained with reference to FIGS. 4 to 6. Fig. 4 is a functional block diagram of the callee's first call, Figure 5 is a circuit diagram showing an example of the caller's circuit, and Figure 6 is a callee's caller's obstinacy detection and call recovery operation diagram. It shows. Note that each component in the figure is the same as in the flower diagram 2, so a description thereof will be omitted.

When the called party enters the first call state, the E9 relay is restored.
Since the CH relay remains operational while the called party is already responding, the 5 counting circuit (FA-PE relay) which operates when a pulse arrives, performs an arbitrary operation, in this case KFi.
PA! At the time of J-ray recovery and PB relay operation, the COA relay operates and detects that the called party is the first caller. After that, at any time, in this case, the PA relay operates, PB! At the time of J-ray recovery, forced recovery is performed and CO relay t- is opened. When the called party calls again within an arbitrary time and the HE relay operates again, the above-mentioned COA relay is restored and the detection of the called party's first call is canceled. Thereafter, the MIJ relay is operated by the 5 counting circuit until the end of the call, and the registration is output.

However, in this method, the arbitrary duration monitoring time is performed by a billing pulse, but this vl gold pulse is a time pulse that differs depending on the band (for example, 45 seconds in the case of billing band K14,
(180 seconds in the case of billing band Kl), there is a drawback that the line is inefficient due to the irregular busy times and the line being held invalid during that time.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks of the prior art and to provide a callee calling circuit which improves line usage efficiency and prevents invalid registration.

According to the present invention, in a charging trunk having five counting circuits, over-charging can be prevented by stopping the counting circuit in an arbitrary counting state as soon as the called party is detected and stopping charging registration. At the same time, by using a constant periodic pulse for the suspension monitoring time, the stress time of the called party can be shortened, and a disconnection circuit can be obtained for the called party which prevents the line from being held invalid.

Next, the present invention will be explained with reference to the drawings.

FIGS. 7 to 9 are diagrams for explaining an embodiment of the present invention. FIG. 7 is a functional block diagram of the callee's first call, and FIG. The circuit diagram shown in FIG. 9 shows the callee's obstinacy detection and tension recovery operations, respectively. 5 counting circuits consisting of PA-PE relays, charging registration relay (M relay), called party response monitoring relay (E relay), called party response memory relay (CH relay), line holding relay (Co!j) relay), and the called party has a detection relay (COA relay). Further, a wraparound prevention diode (D) and a constant period pulse supply terminal PU1AL are provided.

The j5cOA relay is operated by the arrival of the pulse PU at a certain period (for example, 2 to 4 seconds), and it is detected that the called party is the first caller. In this case, whether the called party's status is that the called party is calling first or not, or whether the called party is in a state of being called first or not (missing the receiver, etc.)
This problem can be solved by using an AL pulse to guarantee a certain period of time. Further, charge registration is performed by operating the M relay in accordance with pulses, and the M relay is operated by the operation of the five counting relays PA-PE, that is, the PA relay operation and the PB relay operation. The operation is repeated once for each M relay count. In the present invention, for example, the charging band Kl (2
, 5 seconds), there is a risk of invalid registration, but the progress of the 5 counting circuit is temporarily stopped when the E relay is restored after the CH relay operates. This is dealt with by not allowing crop counting to occur in the holding state. Therefore, JJJK uses a constant periodic pulse to monitor the tension, and the counting circuit is temporarily stopped in an arbitrary counting state after the called party is detected, which forces the line to open and invalidates the registration. The system returns a busy tone to the calling party using a well-known method and requests the calling party to disconnect.

As explained above, the present invention utilizes the use of constant period pulses and the method of temporarily putting a specific counting relay of the 5 counting circuits on hold, thereby shortening the call waiting time and making the registration steady. This has the effect of improving line efficiency and providing subscriber services.

[Brief explanation of drawings]

Figures 1 to 3 are diagrams for explaining the conventional method of setting the stress monitoring time. Figure 1 is a functional block diagram of the callee's first call, and Figure 2 is an example of the disconnection circuit. Circuit diagram showing 3rd
The figure is a diagram of the callee's call detection and recovery operation, No. 4.
Figures 6 to 6 are diagrams for explaining the conventional stressing method using pulses, Figure 4 is a functional block diagram of the callee's first call, and Figure 5 shows an example of the stressing circuit. The circuit diagram, Figure 6, shows the operation of disconnection detection and disconnection recovery for the called party, Figures 1~
FIG. 9 is a diagram for explaining the present invention, FIG. 7 is a functional block diagram of the callee's first call, and FIG. 8 is a circuit diagram showing an embodiment of the disconnection circuit. The callee's first call is a diagram of a state of tension detection and a state of tension recovery. PA-PE: Relays constituting 5 counting circuits, M: &l Kanato NIJ relay, E: Called party response monitoring relay, CI (: Called party response memory relay, CO: Line holding relay, CO
A: Detection relay for the called party, D: Diode for preventing jamming, PUXAL constant cycle pulse supply terminal. Continuation of page 1 @ Inventor Masaru Takamiko. @Inventor Shigeki Nakauchi. 21 Hata, Totsuka-cho, Totsuka-ku, Ohama City Hitachi, Ltd. Totsuka Knee

Claims (1)

[Claims] After detecting called party pre-call in a charging trunk with 5 counting circuits that generate 1 cI registration pulse every 6 counts,
means for stopping the charge registration by stopping the five counting circuits in the ltl number state; The called party is characterized by having the means to carry out the obstinacy of time.