JPS5819198B2 - General, public line merging method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a system for merging general lines and public lines in an automatic telephone exchange.

Conventionally, the public charging trunk 10T-CH, which is used for public intra-office connection, is connected to the network N by a honeycomb connection.
It is also used for a so-called public outgoing connection, which connects to a trunk line via an outgoing trunk OGT for the W and general line, thereby merging the general line and the public line.

However, in the case of such a public line, compared to a general line, there is a drawback that call loss and attenuation distortion are large by 7"S due to the connection via the 10T-CH.

The reason for this will be explained below using FIGS. 1 to 4.

Figure 1 shows the conventional internal trunk for public charging 10T-CH.
The circuit diagram of FIG. 2 is a Karnaugh map showing the pattern control.

In FIG. 1, 1 is a front-end monitoring and billing pulse sending circuit, 2 is a called party monitoring relay, 3 is a communication capacitor, and 4 is a charging pulse sending circuit.
, 5 are contacts of pattern relays S and T, respectively, and 6 is a power source.

First, the circuit operation of ■OT-○H in FIG. 1 will be explained using the Carnot map shown in FIG.

In the state of pattern "0" of the Carnot map, pattern relays S and T have been restored, and 0T-CH is in an empty state.

In pattern "1", only pattern relay S operates and 5
OP1 Therefore, contacts SQ, Sl of pattern relay S
operates, a loop is formed between terminal AI, make contact SO, break contact t, make contact S1, and terminal B1, and the output trunk OG is connected by a double-wrap connection.
A continuity test with T is performed.

In pattern "2", only pattern relay T operates and T
Op, its contact t operates.

This pattern is for calls connected within your own station, and terminals AO and B
O is connected to the calling public telephone subscriber via the network, and the front-end monitoring and billing pulse sending circuit 1 monitors the calling subscriber and sends out billing pulses.

Further, the terminals AI and B'l are connected to the called telephone subscriber via the network, and the called subscriber is monitored by the called party monitoring relay 2.

pattern! At 1399, pattern relays S and T operate and Sop, Top and their contacts SO, Sl and t operate.

This pattern is for outgoing calls, where terminals AO and BO are connected to the calling public telephone subscriber via the network,
Monitoring and billing pulses are sent to the calling subscriber.

On the other hand, terminals A1 and B1 are connected to the outgoing trunk OGT via the network by a dowel connection, but the called party monitoring relay 2, which was connected between the A and B lines of the communication line during a local connection call, The DC loop for the called party is then disconnected.

The state of this pattern "°3" will be further explained using FIGS. 3 and 4.

FIG. 3 shows a relay system diagram when a general line and a public line are merged, and FIG. 4 shows a circuit diagram when a 10T-CH and an OGT are connected in a double-winding manner.

In FIG. 3, 7 is a network NW, 8 is a trunk for public charging within the local office 10T-CH, 9 is a general line usage rate r rank 0 GT 110 is a public telephone subscriber, and 11 is a public telephone subscriber.

The call subscribers a, b, c, and d are call paths.

In addition, in Fig. 4, 12 in the OGT is a front monitoring relay, 13 is a communication capacitor, and 14 is a rear entry trunk I.
CT monitoring relay 15 is a diode.

First, a public telephone subscriber 10 makes a long-distance call, etc.

When continuing a call, a connection is made to the incoming trunk ICT of the subsequent station via the following route.

NW path a - IOTCH NW path b - NWzf sc
-OGT-Relay line.

On the other hand, when an outgoing call is made from the general telephone subscriber 11, it is connected to the ICT of the subsequent station via the NW path d, -0GT-trunk line route.

Therefore, outgoing connections from public telephone subscribers and ordinary telephone subscribers can both be made via the trunk OGT for ordinary lines and trunk lines, making it possible to merge public lines and ordinary lines.

However, as shown in FIG. 4, in the case of an outgoing call from a public telephone subscriber, the front monitoring and charging pulse sending circuit 1, the call capacitor 3, and the OG
A front monitoring relay 12, a communication capacitor 13, and a rear CT monitoring relay 14 intervene in the T.

This is because, compared to a general telephone trunk, the telephone condenser and forward monitoring means are duplicated.

Therefore, although this conventional method poses no problem in terms of call loss and attenuation distortion when making calls within the local station, it does not satisfy the standards when making outgoing calls using the drumstick connection.

Therefore, in most of the toll lines, it was necessary to provide an outgoing trunk for public charging only for outgoing connections, and to adopt a configuration in which the general line and the public line were separated, which was very uneconomical.

SUMMARY OF THE INVENTION An object of the present invention is to provide a public line merging system that eliminates the drawbacks of the conventional system described above and allows merging of public lines and general lines without impairing call loss or attenuation distortion.

For this purpose, the present invention provides a public telephone billing system in which a forward monitoring and billing pulse sending means is connected to the calling side and a called party monitoring means is connected to the called side when a public telephone subscriber makes an in-office connection. In this system, the trunk within the own office is also used for outgoing calls from public telephone subscribers, and by connecting to the outgoing trunk via the trunk within the own office, the general line and the public line can be merged. A successor trunk monitoring means is provided in the trunk within the own office for public charging, and when an outgoing connection is made, the called party monitoring means on the called side in the trunk within the own office for public charging is connected to the successor trunk monitoring means. It is configured to switch using contacts, and puts the outgoing trunk in a through pattern state.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 5 shows a circuit diagram of a local trunk LOT-CH for public charging according to an embodiment of the present invention, and the Carnot map showing its pattern control is the same as that in FIG.

In FIG. 5, each symbol 1 to 6 indicates the same function as the corresponding symbol in FIG. Connections are different.

In addition, 16 is a resistance for forming a loop during a continuity test, and 17 is a rear trunk ICT when connecting with an outgoing trunk.
A downstream ICT monitoring relay 18 is used to absorb the flyback of the called party monitoring relay 2 for monitoring the called subscriber when connected within its own station, and this called party monitoring relay 18 is used to monitor the downstream ICT. This is a diode to bypass 2.

Below, based on the Carnot map shown in Figure 2, 10T-CH
Explain the operation of the circuit.

First, in pattern "0" in the Carnot map, pattern relays S and T are in a restored state, and 10T-CH is in an empty state.

In the pattern "'1", only the pattern relay S operates and the contact s2 operates, and the terminal A1-
A loop is formed from the break contact to the make contact s2 to the resistor 16 to the break contact t1 to the terminal B1.

Through this loop, a continuity test with the outgoing trunk OGT connected by a honeycomb connection is performed.

In pattern "2", only pattern relay T operates and T
OP, and its contacts tO and tl connect the called party monitoring relay 2 and the power supply 6 to the called side connection terminals AI and B1.

This pattern "2" is a case of an intra-office connection call, and the monitoring of the calling party and the called party, the sending of billing pulses, etc. are the same as the state of pattern "2" in FIG.

The next pattern °゛3'' is pattern “3” in Figure 1.
This is also the case of an outgoing connection call that is connected to an outgoing trunk OGT using a honeycomb connection, but whereas conventionally the incoming trunk ICT of the downstream station was monitored by the downstream monitoring relay in the OGT, Here, this is done by the rear ICT monitoring relay 1T provided in the 10T-CH.

That is, in this pattern, since pattern relays S and T operate, their contacts sO, s1 and tO, t
l, terminal B1 - make contact t1 - diode 18
- Make contact s1 - Relay 17 - Make contact sO - Diode 18 - Make contact to one terminal A1 forms a loop for the rear.

The relay 17 in this loop monitors the ICT of the downstream station connected to the OGT via the trunk line.

As a result, the downstream ICT monitoring function provided in the OGT is no longer necessary, and the forward monitoring function and communication capacitor are also provided in the 10T-CH, so the OGT side has a complete through pattern. can be formed.

This eliminates the need for a front-end monitoring function and a communication capacitor to overlap and intervene in the communication line, as in conventional public outgoing telephone calls, and it is possible to improve communication loss and attenuation distortion.

Note that the outgoing trunk LPOGT for LP line having a through pattern function is normally used as the OGT connected to the l0T-CH in a honeycomb manner.
A circuit diagram when connected to GT is shown in Figure 6.

As is clear from Fig. 6, by putting the LPOGT side into the through state by pattern control (operation of contact 19 of the pattern relay in the LPOGT), the l0T-CH and LPOG
It becomes possible to completely configure one trunk on the m side.

In this case, there is no hardware change on the LPOGT side, and the l0T-C
This is achieved by creating a through state through pattern control when connected to H.

As described in detail above, the present invention enables not only public calls within one's own office, but also calls made to public outgoing connections by means of connection with outgoing trunks for general lines, and reduces call loss and attenuation distortion. This will realize a method of merging general and public lines that solves the problem economically.

[Brief explanation of the drawing]

Figure 1 shows the conventional internal trunk IOT for public charging.
CH circuit diagram, Figure 2 is a Karnot map showing the pattern control in Figure 1, Figure 3 is a relay system diagram to explain the merging of general lines and public lines, Figure 4 is the conventional 10T-C.
When H and OGT are connected; FIG. 5 is a circuit diagram showing an embodiment of the l0T-CH according to the present invention; FIG. 6 is when the l0T-CH and OGT are connected according to the present invention. FIG. 10T-CH...In-house trunk for public charging,
LPOGT...Outgoing trunk for LP line, 1...
...Previous monitoring and billing pulse sending circuit, 2...
...Called party monitoring relay, 3,13...Telephone capacitor, 4゜5.19...Pattern relay contact, 6...Power supply, 12... ...Front monitoring relay, 16...For loop formation; resistance, 14
, 17... Rear ICT monitoring relay, 15.18
······diode.

Claims (1)

[Claims] 1. When making a public outgoing connection, the public charging in-house trunk, which has means for monitoring the calling and called parties and charging pulse sending means, is connected to the outgoing trunk for the general line in a beveled manner to connect the general line and the public line. In an automatic telephone exchange that connects to the incoming trunk of a subsequent station, an incoming trunk monitoring means for the subsequent station is installed in the public charging private trunk, and when a public outgoing connection is made, this person's trunk monitoring means is 1. A system for merging general and public lines, characterized in that the outgoing trunk is connected to the network and the outgoing trunk is in a through pattern state.