JPS6136423B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for transmitting billing pulses to a home frequency meter or the like installed in a subscriber's premises of a telephone exchange.

Conventionally, as shown in FIG. 1, billing pulses are transmitted by AC signals to subscriber 1 having an in-home frequency meter 2 by using an outgoing trunk 9 (or an in-house trunk, etc.) having a billing pulse sending circuit. The relay 7 is operated under the control of the relay control device 6,
It was restored and the operation was carried out via the contact point 8. However, in this system, for each outgoing route, it is necessary to separate outgoing trunk groups belonging to that route into a trunk group having a billing pulse sending circuit and a general trunk group not having such a circuit. Therefore, due to division loss, there was a disadvantage that the required number of trunks increased compared to before the trunk groups were separated. In particular, when the number of outgoing routes from one station is large and the number of traffic per route is small, this division loss becomes significant. For example, the total outgoing traffic of one station is 500 Erl.
If we assume that the traffic that requires sending billing pulses to subscribers is 2% (10 Erl) and the number of outgoing routes is 50, then the average traffic per route is 9.8 Erl for the general trunk group, and the traffic that needs to be sent out for billing pulses is 2% (10 Erl). The trunk group becomes 0.2Erl. Therefore, if the call loss probability on the trunk is 0.01, the required number of trunk circuits is 18 general trunks and 3 outgoing trunks for billing pulse transmission. number of circuits
Compared to 18 circuits, the number is increased by the number of outgoing trunk circuits for sending billing pulses. In particular, the usage efficiency of charging pulse transmission trunks, which are more expensive than general trunks, is lower (approximately 7% in the above example), so the required number is smaller than the total number of traffic stations that require charging pulse transmission. Another problem is that so many are needed.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to improve the usage efficiency of a trunk having a billing pulse sending function.

In the present invention, when a billing pulse sending function to an in-home frequency meter, etc. is required in an automatic telephone exchange, an outgoing trunk, an in-office trunk, etc. with a billing pulse sending function is not used, and the outgoing trunk and other trunks are separately used. A special trunk for transmitting billing pulses is used to connect the subscriber's line, call path, and a special trunk for transmitting billing pulses between the subscriber and a call trunk such as an outgoing trunk for an outgoing call from a subscriber who has an in-home frequency meter. -Speech path-Connection is made through a speech trunk route, and charging pulse registration is performed by sending charging pulses to the subscriber from a special trunk for transmitting charging pulses.

The present invention will be explained in detail below using FIG. 2.
FIG. 2 shows a subscriber in a special trunk 10 where an outgoing call is made to another station from a subscriber 1 having an in-home frequency meter 2, and the subscriber's line sends a charging pulse in the form of an AC signal via a communication path 3. The trunk side terminal of the special trunk 10 is connected to the communication trunk 11 via the communication path 3. The special trunk 10 is provided with a relay 7 that controls the transmission of billing pulses, and is controlled by the relay central control device 5 via a relay drive device to control the in-home frequency meter 2 of the subscriber 1.
A charging pulse is sent to.

Here, since this special trunk can be connected to the outgoing trunk of any outgoing route via a communication path, it can be used in common from trunk groups of all outgoing routes. Although FIG. 2 shows a connection between a subscriber and an outgoing trunk, a connection between a subscriber and an in-office trunk, a talkie trunk, etc. can be made in the same way. In addition, the second
In the special trunk for sending charging pulses shown in the figure, only the circuit for sending out charging pulses using AC signals is shown, and the band stop circuit for preventing AC signals from flowing to the outgoing trunk side is omitted.

As described above, according to the present invention, the charging pulse sending trunk group, which was conventionally provided for the outgoing route, can be
A special trunk for sending billing pulses is provided separately from the call trunk, and this can be used as a common trunk for all outgoing routes.
Since no division loss occurs, the number of required circuits is reduced compared to the conventional system.

In the above example, in the conventional method, the number of trunks for sending charging pulses is 150 for the total required traffic of 10 Erl.
According to the present invention, only 21 circuits are required for special trunks for sending billing pulses, even if the call loss probability is 0.001, which is a drastic reduction to about 1/7. In addition, since the special trunk for transmitting billing pulses has a through state between the subscriber side terminal and the trunk side terminal in terms of direct current, it can be connected to any type of outgoing trunk or trunk within the own office, and can be connected to any type of outgoing trunk or trunk within the own station, and can be connected to any type of outgoing trunk or trunk within the own station. There is also the advantage that there is no need to provide trunks for sending billing pulses for each trunk type, which was done in the prior art.

[Brief explanation of the drawing]

FIG. 1 is a relay system diagram showing an example of a conventional charging pulse signal sending method using an AC signal, and FIG. 2 is a relay system diagram showing an example of the charging pulse signal sending method using an AC signal according to the present invention. It is a system diagram. 3: Call path, 10: Special trunk, 11: Outgoing trunk.

Claims (1)

[Scope of Claims] 1. In an automatic telephone exchange, a special trunk for transmitting billing pulses provided separately from a call trunk such as an outgoing trunk is used to respond to outgoing calls from subscribers, etc. who have an in-home frequency meter. The subscriber and a call trunk such as an outgoing trunk are connected via the subscriber's line - call path - special trunk for sending billing pulses - call path - call trunk, and billing pulses are sent from the special trunk for sending billing pulses to the subscriber. A billing pulse signal sending method characterized in that billing pulse registration is performed by sending out a billing pulse signal. 2. The billing pulse signal sending system according to claim 1, wherein the billing pulse is a billing pulse based on an alternating current signal.