JPH03120993A - Dial code relay circuit - Google Patents

Abstract

PURPOSE:To eliminate need for a dial pulse reception circuit for an exchange by converting a selection signal of dial pulse system with a single frequency received from a transmission line into a selection signal of multi-frequency combination system and outputting the converted signal to the exchange. CONSTITUTION:A dial pause detection section 15 measures time larger than time between dial pulses and smaller than a minimum dial pause time to detect a dial pause and to output pause information. A dial pulse count section 16 inputs the output of a signal frequency reception section 14 to calculate the pulse and a count when the pause information is received from the dial pause detection section 15 is outputted as dial numeral information to return the pulse count to zero. An MF signal sender 17 converts the numeral information received from the dial pulse count section 16 into prescribed multi-frequency (MF) signal and outputs the result by a prescribed length. The output of a signal adder section 18 is given to an exchange via a relay coil 13 through a line channel. Thus, a dial pulse reception circuit for the exchange is not required.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dial code relay circuit of a trunk line device that transfers a dial code using an intermittent signal of a single frequency from a transmission line to a switching device that receives the dial code.

[Conventional technology]

Conventionally, this type of dial code relay circuit converts a dial code received from a transmission path using an intermittent signal frequency into an intermittent direct current, and transmits the converted direct current to an exchange device.

These will be explained with reference to the drawings.

FIG. 3 is a relay connection diagram showing an example of an information path connecting switching devices, and FIG. 4 is a time chart showing a conventional example of signals transmitted by the method shown in FIG.

In FIG. 3, the switching device 1 connects a communication path 51 and a signal path 52 to the OD trunk line device 2, and further connects a communication path 7E and a signal path from the OD trunk device 3 on the receiving side via a transmission path 60. 72, it is also connected to the exchange device 4.

As an example of a signaling system between switching stations having switching devices 1 and 4, the OD system in the inter-office signaling system of the Electronic Information and Communication Handbook PP2046-2047 (edited by the Institute of Electronics, Information and Communication Engineers, 1988, published by Ohmsha) will be exemplified.

FIG. 4 shows the signal path 52. in FIG. A supervisory signal 1 selection signal passing through a transmission path 60 and a signal path 72 is shown. When the signal path 52 captures this relay line, it forms a DC circuit (
ON)L, disconnects (OFF) when released. After capture,
A dial pulse (DP) appears as a cutting pulse, with three pulses indicating the dial numeral ``3''. In FIG. 4, the dial number ends with "1".Since the OD trunk line device 2 transmits a frequency of 3850 Hz outside the communication band as a monitoring signal to the communication path in an idle state, the transmission path 60 is connected to the ON signal from the signal path 52. The signal cuts off the transmission of the 3850 Hz monitoring signal.Therefore, a 3850 Hz pulse is transmitted as the dial pulse. The inter-office relay of the Yu-dial code, which converts the presence or absence of a DC signal into an intermittent DC signal (off/on) and sends it to the switching device 4 via the signal path 72, requires various services.
Since cases of bulk transmission from a transmitting station are increasing, in order to increase the code transmission speed, many trunk lines use the MF method, and the use of the DP method is limited.

[Problem to be solved by the invention]

As mentioned above, the conventional dial code relay circuit is configured to directly relay the dial pulse (intermittent pulse) received from the transmission line when the selection signal is the DP method.
When accommodating DP lines in a switching device, a DP dial code receiving circuit is required, and especially when there are a small number of DP lines, there is a problem in that the DP receiving circuit deteriorates economic efficiency.

An object of the present invention is to provide a trunk line device in which the selection signal is a DP method.
An object of the present invention is to provide a dial code relay circuit that solves the above problems by converting received dial pulses into multi-frequency (MF) signals on the signal input side to a switching device.

[Means to solve the problem]

The dial code relay circuit according to the present invention is a dial code relay circuit of a trunk line device that transfers a dial code based on an intermittent signal of a single frequency from a transmission line to an exchange device that receives it from a transmission line. a signal frequency receiving section that detects and outputs the intermittent signal as an intermittent signal; a dial pause detecting section that receives the intermittent signal output from the signal frequency receiving section, detects the pause period of the intermittent pulse, and outputs dial pause information; a dial pulse counting section that counts pulses of an intermittent signal input from the signal frequency receiving section and outputs the counted value as dial code information when dial pause information from the dial pause detection section is received; and this dial pulse counting section a multi-frequency signal sender that converts the dial code information received from the multi-frequency signal into a dial code based on a predetermined multi-frequency signal and outputs it; and a signal that connects the dial code input from the multi-frequency signal sender to a transmission line and outputs it to the switching device. It has an addition section.

〔Example〕

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

Fig. 1 is a functional block diagram showing one embodiment of the present invention;
The figure is a time chart showing waveforms at main points in FIG.

In FIG. 1, the main parts that relay audio information and signals from the transmission line via the transmission terminal device are the relay ring 11,
13, a level adjustment section 12, a signal frequency reception section 14, a dial pause detection section 15, a dial pulse counting section 16, a multi-frequency (hereinafter referred to as MF) signal sender 17, and a signal addition section 8.

The relay ring 11 receives the transmission path of communication information from the transmission terminal device, and the level adjustment section 12 adjusts the level of the received frequency to a predetermined value. The output of the level adjustment section 12 is received and transmitted by the signal frequency reception section 14, and a monitoring signal is detected. The monitoring signal uses a single frequency of 3850 Hz for the OB method outside the voice band, and 2300 Hz for the IB method within the voice band. If the dial pulse, which is the selection signal, is an intermittent frequency of the monitoring signal, the voice is not connected to the transmission path, so identification is easy. The dial pulse consists of a series of intermittent digit symbols and pulse pause times between the digit symbols.

Refer to FIG. 2 for the explanation of the relay circuit. A single frequency (e.g. 3800Hz or 2300Hz) from the transmission line
The availability is notified by the presence of . Once this line is acquired and put into use, the single frequency signal disappears,
The dial pulse is received by a signal frequency pulse. In FIG. 2, the dial number "31" is received and then released.

The signal frequency receiving section 14 outputs the presence or absence of a single frequency to be received. The dial pause detection unit 15 measures a time that is longer than the time between dial pulses and smaller than the minimum dial pause, detects a dial pause, and outputs pause information. The dial pulse counting section 16 is the signal frequency receiving section 1
4 is input, the pulses are counted, and the count value when the pause information is received from the dial pause detection section 15 is outputted as dial numeric information, and the pulse count is returned to zero. The MF signal sender 17 converts the numerical information received from the dial pulse counter 16 into a predetermined multi-frequency (MP) signal, and outputs the signal for a predetermined length.

For example, according to the standards of the Nippon Telegraph and Telephone Company for MF multiplied signals between stations, a dial code is formed by combining six to two frequencies from 700 Hz to 1,700 Hz at intervals of 200 Hz.

The signal adder 18 superimposes and adds the output of the MF signal sender 17 to the output of the level adjuster 12, and this output is connected to the switching device via the relay ring 13 as a communication path of this line.

The supervisory signal detection section 19 monitors the time exceeding the dial pause, detects line release, and notifies the above-mentioned dial pause detection section 15 and dial pulse counting section 16.

In this embodiment, it has been explained that the dial pause detection section 15 and the dial pulse counting section 16 receive the notification of line capture release from the supervisory signal detection section 19, but the circuit restoration may be performed at a separate stage and is not limited to the above explanation. . Since the transmission line is an inter-office relay line, the MF multiplied signal is 700Hz to L 700.
The signal frequency was up to Hz, but in the case of subscriber lines,
The MF signal sender converts it into a PE signal (a signal that is a combination of one of the four frequencies from 697Hz to 94.1Hz transmitted by the push button dial and one of the three frequencies from 1209Hz to 1477Hz). . In this case, the switching equipment can be used as a subscriber line for PE signals, and the terminal can be equipped with a rotary dial dialing circuit, and the dial code can be transmitted as a PE signal to the connected terminal, so it can be used in a variety of ways. Also available for services.

〔Effect of the invention〕

As explained above, according to the dial code relay circuit of the present invention, the selection signal of the dial pulse method using a single frequency received from the transmission line is converted into the selection signal of the multi-frequency combination method and outputted to the switching device. This eliminates the need for a dial pulse receiving circuit in the switching device.
This has the effect of improving economic efficiency.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an example of an actual journey of the dial code relay circuit of the present invention, Fig. 2 is a time chart showing signal waveforms at the main points in Fig. 1, and Fig. 3 is an example of a relay line using an OD line. FIG. 4 is a time chart showing an example of the signal waveform transmitted in FIG. 1.4... Switching device, 2, 3... Trunk line device, 14... Signal frequency receiving section, 15...
...Dial BOSE detection section, 16...Dial pulse counting section, 17...MF signal sender, 1
8...Signal adder, 60...Transmission line.

Claims (1)

[Scope of Claims] In a dial code relay circuit of a trunk line device that transfers a dial code based on an intermittent signal of a single frequency from a transmission line to a switching device that receives the dial code, the intermittent signal of a predetermined single frequency received from the transmission line is intermittent. a signal frequency receiving section that detects and outputs the signal as a signal; a dial pause detecting section that receives the intermittent signal output from the signal frequency receiving section, detects the pause period of the intermittent pulse, and outputs dial pause information; and the signal frequency receiving section. a dial pulse counting section that counts the pulses of the intermittent signal inputted from the section and outputs the counted value as dial code information when receiving the dial pause information of the dial pause detection section; A multi-frequency signal sender that converts dial code information into a dial code based on a predetermined multi-frequency signal and outputs the same, and a signal adder that connects the dial code input from the multi-frequency signal sender to a transmission path and outputs it to a switching device. A dial code relay circuit comprising: