JPH01318449A - Transmission system for telephone exchange signal - Google Patents

Abstract

PURPOSE:To extend the telephone exchange service by using a repeater which can realize the transmission of a polarity inverting signal of a loop used for identification of coins related to the charging jobs and also the transmission of the state monitor signal of a telephone subscriber terminal to a switchboard. CONSTITUTION:The repeaters REP200 and 400 contain the polarity inversion detecting circuits 10a, the binary coding circuits 20a and the binary decoding circuits 30a in addition to the function blocks 21-25 and 41-44 and transmit four state information by means of the value A of the pulse width (a) and the value B of the pulse width (b). Thus an automatic response process and the transmission of the charging information are attained via a telephone terminal 5. At the same time, plural different pulse widths are produced. For instance, it is possible to transmit various information including a monitor information of the application state of the terminal 5, etc., can be transmitted between both REP200 and 400. Thus the telephone exchange service is secured in a wider range.

Description

[Detailed Description of the Invention] [Summary] This invention relates to a transmission system for telephone exchange signals that also transmits polarity reversal information via a two-wire metallic cable connecting a telephone exchange and a repeater, and is useful for coin identification, etc. in connection with billing. It is an object of the present invention to provide a telephone exchange signal transmission system capable of expanding telephone exchange services by having a repeater capable of transmitting a polarity inversion signal of a used loop and transmitting a status monitoring signal of a telephone subscriber terminal to an exchange. The purpose is to detect the polarity reversal of the signal when the two-wire metallic cable exchanged between the repeater and the telephone exchange side is looped, and to detect the polarity reversal of the signals sent from the telephone exchange side. A binary encoding means encodes the signal into a binary value according to the method and sends it from the transmission signal line, and a binary decoding means receives and decodes the signal encoded by the binary encoding means on the reception signal line. Set up and configure.

[Industrial application field]

The present invention relates to a telephone exchange signal transmission system that also transmits polarity reversal information via a two-wire metallic cable connecting a telephone exchange and a repeater.

Currently, public telephones are generally wired to accommodate subscribers using two-wire metallic cables. In this case, the distance that can be extended from a subscriber exchange (or concentrator) to a home device such as a telephone is limited to, for example, 7 km.

On the other hand, for example, if a new type of operator wants to service an area of 7 km or more using a two-wire metallic cable, there is no appropriate transmission method to do so.
Countermeasures that can respond to these new services are required.

[Prior Art] FIG. 4 is a diagram illustrating a conventional example, and FIG. 5 is a diagram illustrating an example of a switching network.

The example shown in FIG. 4 is the transmission of a 16 Hz ringing signal (16 Hz ringer) from the exchange 1 to the telephone terminal 5, and the on/off hooking of the telephone terminal 5.

This is an example in which a repeater (hereinafter referred to as REP) 2.4 is used to transmit dial pulses and the like to the exchange 1.

In the example shown in Figure 4, a 2-wire metallic cable is used between exchange 1 and REP 2, and 4W is used between REP 2.4.
It is connected by a 3.4WR telephone line and SS and SR signal lines. Note that numeral 3 indicates a transmission path between REPs 2 and 4.

In addition, the REP 2 includes a hybrid (hereinafter referred to as H) 21 that performs conversion between 2-wire and 4-wire, a ringer detection circuit 22 that detects 16Hz ringer, and a DC communication path of a 2-line communication path connected by a 2-wire metallic cable. It includes a DC loop control circuit 23 for controlling the loop, a signal sending relay circuit (hereinafter referred to as an SS circuit) 24, and a signal receiving relay circuit (hereinafter referred to as an SR circuit) 25.

On the other hand, REP4 includes H4I that performs conversion between 2-wire and 4-wire, loop detection circuit 42 that detects DC loop, ringer sending circuit 45 that sends out 16 Hz ringer to 2-wire metallic cable, SS circuit 43, and SR. A circuit 44 is provided.

An example of such a switching network is shown in FIG. The switching stations 1a to IC shown in FIG. 5 are installed by the Nippon Telegraph and Telephone Company (hereinafter referred to as NTT), and are one
Approximately 7K with 2-wire metallic cable centered around IC
A telephone exchange service is provided by installing telephone terminals 5a to 5c within m.

14 = On the other hand, the switching stations 62 to 6c were installed by a newly entered type of carrier (hereinafter referred to as NCC) to provide transmission services between specific ranges, and are equipped with a relay switching function. normally cannot be connected to the telephone terminals 5a to 5c.

Between these exchanges 6a to 6c, NCC processes the functions from REP2 to REP4 via transmission line 3 shown in Figure 4, and between REP2 and exchange 1 and between REP4 and telephone 5 were installed by NTT. You will be using something.

For example, when a 16Hz ringer is sent from exchange 1 to one wire of a 2-wire metallic cable, REP
The ringer detection circuit 22 in the SS circuit 2 detects this, and the ringer detection information is sent out by the on/off signal of the SS circuit 24.

When the REP 4 receives this on/off signal in the SR circuit 44, it accesses the ringer sending circuit 45 using the on/off signal of the SR circuit 44 and outputs the 16Hz ringer generating circuit 4.
The 16Hz ringer from a is sent to the telephone terminal 5 to make a call.

6- Normally, the exchange of signals between exchange 1 and REP 2 is 16
In addition to turning on/off the Hz ringer, earth air, or battery, loop signals, electrically open signals, loop polarity inversion signals, etc. are transmitted and received.

However, regarding the exchange of signals between REP2 and REP4, earth air or battery on/off signals are transmitted and received between SS circuit 24 or 43 and SR circuit 25 or 44.

Therefore, when the telephone terminal 5 responds, it is not possible to transmit a response signal that inverts the polarity of the loop, so it is not possible to manually operate it in some way, to make a call without a response signal, or to perform other billing information transmission processing. There will be no.

[Problem to be solved by the invention]

As mentioned above, between REP 2 and REP 4, it is not possible to exchange loop signals, response signals, electrically open signals used for billing information processing, loop inversion signals, etc. Direct REP for connection of telephone terminals, etc.
2 and 4 to the exchanges 6a to 6C of the NCC network shown in Fig. 5, it will not be possible to meet the demands of customers who request such services. becomes.

The present invention can expand telephone exchange services by having a repeater that is capable of transmitting a loop polarity reversal signal used for coin identification in connection with billing, and transmitting a status monitoring signal of a telephone subscriber terminal to an exchange. The purpose is to provide a transmission method for telephone exchange signals.

[Means to solve the problem]

FIG. 1 shows a detailed illustration of the invention.

10 in the block diagram of the principle of the present invention shown in FIG. 1 is a polarity reversal detection means for detecting the polarity reversal of the signal when the two-wire metallic cable exchanged between the repeater and the telephone exchange side is looped; 20 is a binary encoding means that encodes various signals sent from the telephone exchange side into binary codes using long and short codes and sends them from the transmission signal line SS, =7
- 30 is a binary decoding means that receives and decodes the signal encoded by the binary encoding means 20 on the reception signal line SR; by providing such means, it is possible to solve this problem. Use as a means.

[For production]

The transmission information between the transmitting signal line SS and the receiving signal line SR of the repeaters 200, 400 includes the polarity reversal information of the DC loop signal in addition to the earth air or battery on/off signal information sent from the telephone exchange side. The detecting means 10 detects it, the binary encoding means 20 converts it into a binary code, and the repeater 20
By combining these signals, it is possible to transmit signals between 0 and 400 bits of information.

〔Example〕

The gist of the present invention will be specifically explained below with reference to embodiments shown in FIGS. 2 and 3.

FIG. 2 is a diagram for explaining the present invention in detail, and FIG. 3 is a diagram for explaining the status of transmitted information in an embodiment of the present invention. Note that the same reference numerals refer to the same objects throughout the plan.

The embodiment shown in FIG. 2 is used as the polarity reversal detection means 10 explained in FIG. Polarity reversal detection circuit 10 that sends out
a. As the binary encoding means 20, a binary encoding circuit 20a that binary encodes information according to the length of the pulse width as shown in FIG. 3, for example; as the binary decoding means 30, 2 in circuit 20a
This example includes a binary decoding circuit 30a that detects digitized information and decodes it into a polarity inversion signal, an on/off signal, etc. of the original DC loop signal.

The REP 200, 400 of this embodiment includes the above-mentioned polarity reversal detection circuit 10a, binary encoding circuit 20a, and binary decoding circuit 30a in addition to the functional blocks 21 to 25 and 41 to 44 explained in FIG. Next to Shitachi.

FIG. 3 explains an example of binary encoding by the binary encoding circuit 20a, and this example shows the A value of the pulse width (a) and the B value of the pulse width fb) )> Pulse width (b)) is used to transmit four status information.

That is, a state with no transmission information, a state with only A value, a state with A value/
It becomes possible to transmit four state information: a state with a combination of B values and a state with only B values.

Therefore, for example, if it is defined that the ON/OFF signal is sent in the state of only the A value and only the state of the B value, and the polarity inversion signal of the DC loop signal is sent in the state of the combined A value/B value, then the REP The polarity inversion signal of the DC loop signal can be exchanged between the R22400 and the R22400.

This enables, for example, automatic response processing and billing information transmission processing of the telephone terminal 5, and by creating a plurality of pulse widths, for example, monitoring information of the usage status of the telephone terminal 5 (for example, on-hook, off-hook state, REP 200 and R22400
This makes it possible to provide a wider range of services.

〔Effect of the invention〕

According to the present invention as described above, in addition to the on/off signal, it is also possible to transmit the polarity inversion signal of the DC loop signal, so that it is possible to support a wider range of services in the telephone exchange network.

[Brief explanation of the drawing]

FIG. 1 is a diagram explaining the present invention in detail, FIG. 2 is a diagram explaining the present invention in detail, FIG. 3 is a diagram explaining the status of transmission information in the embodiment of the present invention, and FIG. 4 is a diagram explaining the conventional FIG. 5 is a diagram explaining an example, and FIG. 5 is a diagram explaining an example of a switching network. In the figure, ■ is an exchange, 1a to lc, 6a to 6c are exchanges, 2, 4, 200, 400 are REP, 3 is a transmission line, 4a is a 16Hz ringer generator, 5.58 to 5a are telephone terminals, 10 is a polarity reversal detection means, 10a is a polarity reversal detection circuit, 20 is a binary encoding means, 20a is a binary encoding circuit, 21.41 is Hl 22 is a ringer detection circuit, 23 is a DC loop control circuit, 24.43 is an SS circuit, 25.44 is an SR circuit, 30 is a binary decoding means, 30a is a binary decoding circuit, 42 is a loop detection circuit, 45 is a ringer sending circuit, Fig. 4, Fig. 5

Claims (1)

[Claims] A transmission signal line (S
A repeater (200, 400
), a polarity reversal detection means for detecting polarity reversal of a signal when the two-wire metallic cable exchanged between the repeater (200, 400) and the telephone exchange side is looped. (10) and
Binary encoding means (20) that encodes various signals sent from the telephone exchange side into binary codes using long and short codes and sends them from the transmission signal line (SS); and the binary encoding means (20). The binary encoded signal is sent to the receiving signal line (SR
) for receiving and decoding the information transmitted between the sending signal line (SS) and the receiving signal line (SR), and transmitting the information transmitted between the sending signal line (SS) and the receiving signal line (SR) to the on/off signal sent from the telephone exchange side. In addition to the off signal, the polarity reversal information of the DC loop signal is detected by the polarity reversal detection means (10), which is converted into binary data by the binary encoding means (20) and transmitted. Transmission method for telephone exchange signals.