JPH0396192A - Relay line device - Google Patents

Abstract

PURPOSE:To avoid provision of functions in duplicate by providing basically a line connection function having the SR monitor signal with a voice out-band frequency of a main signal and adding an IB addition circuit to a line for a monitor signal with voice in-band frequency. CONSTITUTION:The relay line device is provided with level adjustment sections 11, 12, a PB signal connection section 13, a relay coil 14, an IB signal connection section 28 and a line division section 29 and connected removably with an IB addition circuit 20. The IB addition circuit 20 is provided with an IB signal outgoing section 21, an IB signal transmission section 22 and an IB signal detection section 23. Then a common circuit to different signal systems is provided and the different part is formed as an addition section to avoid a duplicate circuit for the relay line device and a signal generator.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a trunk line device, particularly a supervisory signal transmission path receiving path (control path) that connects a supervisory signal and a dial number to a transmission terminal device by an on/off control signal; The present invention relates to a trunk line device having a level adjustment unit and a trunk ring as main components and a sending and receiving path (speech path) connecting from an exchange switch to a transmission terminal device.

[Conventional technology]

The mainstream of conventional trunk line equipment, especially trunk line equipment in corporate communication networks, is the OD trunk line equipment that monitors the transmission path using on/off control signals of frequencies outside the voice band and is connected to the OD line that sends and receives dialed numbers. is occupying. Nowadays, when branch offices, branches, and factories that used to operate individually are connected across local areas, the relay line equipment that connects them to the line is now used rather than transmitting and receiving monitoring signals using frequencies within the voice band. It becomes necessary. However, due to the small number of IB lines,
In principle, OD trunk line equipment was provided, and measures were taken to add an IB signal generator for IB lines.

FIG. 4 is a connection diagram showing an example of a conventional device.

In FIG. 4, an exchange switch 30 is controlled by a call control device 31 and accommodates an OD trunk line device 80 and a telephone (
(not shown) are mutually exchanged and connected.

When the OD trunk line device 80 is connected to the OD line transmission terminal device 81, a communication path and a control path (SS line/SR line) are provided separately, and the OD line transmission terminal device 81 receives the on/off control signal of the control path and the transmission path. on/off control signals based on frequencies outside the audio band.

When the OD trunk line device 80 is connected to the IB line transmission terminal device 82, the communication path and the control path are connected to the IB signal generation device 90.
The IB signal generator 90 mutually converts the on/off control signal on the control path and the on/off control signal on the communication path using a frequency within the voice band on the transmission path.

Next, a conventional device will be explained with reference to FIGS. 5 and 6. FIG. 5 is a functional block diagram showing an example of a conventional OD trunk line device, and FIG. 6 is a functional block diagram showing an example of a conventional IB signal generating device.

In FIG. 5, the OD trunk line device has level adjustment sections 11 and 12, a PB signal connection section 13, and a trunk line ring 14. Level adjustment sections 11 and 12 are provided on the exchange switch side and the transmission terminal device side, respectively. The PB signal connection section 13 connects the transmission path input from the exchange switch via the level adjustment section 11 to the PB signal transmission path 15 to which the PB signal is input, and outputs it to the level adjustment section 12. The PB signal referred to here is an audible frequency selection signal generated by pushbutton dial operation (Electronic Information and Communication Handbook,
(edited by the Institute of Electronics, Information and Communication Engineers, 1988 edition, p. 2046). The transmitting/receiving path of the level adjustment unit l2 is the relay wire ring 14.
Connect to the transmission terminal device via. The reception line from the transmission terminal device is connected to the exchange switch via the relay line 14 and the level adjustment section 12.11 in this order. PB from receiving channel
A PB signal receiving path l6 for receiving the signal is connected to a connection line between the relay ring 14 and the level adjustment section 12.

In addition, the OD trunk line device sends and receives supervisory signals called the SS line and the SR line using the SR method (Electronic Information and Communication Handbook, (mentioned above), p. 2047), which sends and receives on/off control signals using DC between the OD trunk line device and the transmission terminal device. Road 17
and a receiving path l8.

In FIG. 6, each terminal on the trunk line device side is connected to each terminal on the transmission terminal device side in FIG. 5, configuring FIG. 4. In FIG. 6, the IB signal generator includes an IB signal transmitter 21, an IB signal transmitter 22, an IB signal detector 23, an IB signal transmitter 21, an IB signal transmitter 22, an IB signal detector 23,
It has a signal connection section 24, relay wire rings 25 and 91, and a level adjustment section 92.

The IB signal has frequencies within the audio band, that is, audible frequencies 2 and 3.
This is a monitoring signal transmitted via a communication path at 00Hz. The IB signal generator 2l has an IB signal oscillator, and
The B signal transmitter 22 inputs the supervisory signal received at the terminal SS from the OD trunk line device through the supervisory signal transmission path 93, and outputs an IB signal to the IB signal connector 24 based on the input supervisory signal.

The IB signal output section 24 outputs the output of the IB signal transmission section 22 and OD.
From the relay ring 14 (Fig. 5) to the relay ring 9l of the trunk line equipment
The signal is connected to the transmission line output via the level adjustment section 92 and output to the relay ring 25 which connects to the transmission terminal device.

The IB signal detection unit 23 connects the transmission terminal device to the relay ring 25-
The output side of the level adjuster 92 is connected to the receiver line connected to the relay ring 91 via the level adjuster 92, receives and detects the IB signal on the receiver line, and sends the supervisory signal to the terminal SR via the receiver line 94. output as a DC signal to the OD relay line equipment.

[Problem to be solved by the invention]

As mentioned above, when connecting to a relay line that uses monitoring signals for frequencies within the voice band, conventional trunk line equipment is equipped as standard with a relay line that uses monitoring signals for frequencies outside the voice band, which is the mainstream. Since the structure is such that a signal generating device that generates a monitoring signal is additionally connected, the relay line device and the signal generating device overlap in equipment, that is, a part of the relay line ring and the level adjustment section, which makes it particularly difficult to install on a small scale. In-house communication terminal equipment has the problem of deteriorating the economic efficiency of the equipment.

SUMMARY OF THE INVENTION An object of the present invention is to provide a trunk line device that solves the above-mentioned problems by providing common circuits for different signal systems and using different parts as additional parts.

[Means to solve the problem]

The main means of the trunk line device according to the present invention is a supervisory signal transmission line receiving path that connects the supervisory signal and dial number to the transmission terminal device by on/off control signals, and an exchange switch whose main components include a level adjustment section and a relay line ring. In a trunk line device having a sending line and a receiving line connected to the transmission terminal device, a signal is transmitted by connecting a predetermined audio band frequency to the sending line in accordance with an on/off control signal of the supervisory signal transmission line. and a signal detection unit that detects a frequency within a predetermined voice band transmitted to the reception path, converts it into an on/off control signal, and connects to the monitoring signal reception path.
Has additional circuitry.

The trunk line device according to the above means is suitable for an OD system trunk line, and can also be applied to an in-band IB system by additionally connecting an IB additional circuit. Furthermore, since the line cutting section separates the boundary point between the OD system part and the IB system added part, level adjustment and testing can be easily performed.

〔Example〕

Next, the trunk line device of 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;
1 is a schematic diagram showing a connection example of the device shown in FIG. 1, and FIG. 3 is an explanatory diagram showing three examples of the line disconnection section shown in FIG. 1.

First, the trunk line device will be explained with reference to FIG. 1 and FIG. 2. The trunk line device 10 (FIG. 2) includes level adjustment sections 11 and 12, a PB signal connection section 13, a trunk line ring 14, and an IB
It has a signal connection section 28 and a line disconnection section 29, to which an IB addition circuit 20 is detachably connected. IB addition circuit 20
IB signal transmitter 21, IB signal transmitter 22 and IB
It has a signal detection section 23.

The trunk line device 10 is shown in FIGS. 5 and 6 described in the prior art.
This figure is a combination of functional blocks in the figures, and the same components are given the same numbers and symbols, and their explanations will be omitted.

In FIG. 1, an IB signal connection section 28 and a line separation section 29 are additionally inserted between the level adjustment section 12 and the trunk line l4 of the OD trunk line device shown in FIG. 5. in particular,
A line disconnection section 29 is connected to the transmission line side of the level adjustment section 12 and the PB signal reception path 16, and then an IB signal connection section 28 including a level adjustment section 92 is connected to the IB signal connection section 24 shown in FIG. It is connected to the relay line l4 that connects to the transmission line. In other words, when connecting the lines shown in Figs. 5 and 6, the trunk line 14.
, the level adjustment section 92 is absorbed by the IB signal connection section 24 to become the IB signal connection section 28, and the relay wire ring 25 is replaced with the relay wire ring 14. Further, the IB additional circuit 20 has a mechanical structure in which it is formed into one package and fixed by connecting it to the trunk line device of the basic structure using a connector, for example.

The IB signal connection section 28 has a circuit for connecting the IB signal to the communication path, and includes a signal level adjustment function with the transmission terminal device.

Next, according to FIG. 2, the trunk line device 10 without the IB addition circuit 20 can be connected to the transmission terminal device of the OD line on both the speech path and the control path. The connection path is a signal transmission/reception path (SS line, SR line) for monitoring signals of the SR system. When the trunk line device 10 is equipped with an IB additional circuit, the IB line can be used by connecting only the communication path to the transmission terminal device.

Next, the line cutting section 29A shown in FIG. 3(A) has a contact spring terminal for the communication path 50A, and the cutting tool 4l, which has conductors on both sides and is insulated in the center, is connected to the contact spring terminal. The communication path is cut by inserting it between the springs of the cutting tool 41, and each conductor of the cutting tool 41 is connected to, for example, a test device.

The line disconnection section 29B shown in FIG. 3(B)
The cut portions of B are drawn out to terminals, and a shorting tool 42 is used to short-circuit the circuit during operation. During testing, a test jack is used instead of the shorting device 42.

In addition, the line disconnection section 29C shown in FIG. 3(C) has a manual switch inserted in series with the communication path 50G to open and close the circuit.
The separation required for testing, adjustment, etc. is achieved using a manual switch.

In the above embodiment, the monitoring signal of the trunk line equipment was explained as a DC analog signal of the SS line/SR line, but when the exchange performs digital processing, the digital/analog conversion processing means including the exchange switch, that is, the code/decoder in the communication path. (commonly known as a codec), and a monitoring signal transmission/reception path signal converter is added as an interface device.

In addition, in the communication path of the above embodiment, a line disconnection section is provided between the PB signal connection section and the IB signal connection section, which enables easier and more convenient adjustment and testing than conventional terminal connections. .

〔Effect of the invention〕

As explained above, the trunk line device of the present invention is basically equipped with a line connection function having an SR system monitoring signal using a frequency outside the voice band, which is the mainstream, and has a line connection function using a monitoring signal using a frequency inside the voice band. Since a structure is adopted in which an IB additional circuit is added, it is possible to achieve the effect that there is no duplication of functions and it is possible to realize an improvement in economic efficiency.

Furthermore, by providing a line disconnection section in the communication path between the PB signal connection section and the IB signal connection section, adjustment and testing can be facilitated.

[Brief explanation of drawings]

Fig. 1 is a functional block diagram showing one embodiment of the present invention;
The figure is a connection diagram showing a connection example of the present invention, and Figures 3 (A) to (C)
) is a partial explanatory diagram showing a detailed example of the line disconnection section in FIG. 1, FIG. 4 is a connection diagram showing a conventional example, and FIGS. 5 and 6 are functional block diagrams showing details of a conventional example, respectively. It is. 10... Trunk line equipment, 11.12...
Level adjustment unit, 17... Supervisory signal transmission path (SS
line), l8... Monitoring signal receiving path (SR line), 2
0... IB addition circuit, 21... IB signal transmitter, 22... IB signal transmitter, 23...
... IB signal detection section, 28 ... IB signal connection section, 29.29A to 29C ... line disconnection section,
30...Replacement switch. Bamboo 1 circle

Claims (2)

[Claims] (1) A supervisory signal transmission path receiving path that connects the supervisory signal and dial number to the transmission terminal device using an on/off control signal, and a transmission path that connects the exchange switch to the transmission terminal device with the main components being a level adjustment section and a relay ring. In the trunk line device having a talking line and a receiving line, an IB signal transmitter connects a predetermined voice band frequency to the sending line in accordance with an on/off control signal of the supervisory signal transmission line; 1. A trunk line device comprising an IB addition circuit that detects a frequency within a predetermined voice band, converts the frequency into an on/off control signal, and connects to the supervisory signal receiving path. (2) A claim characterized by comprising a line cutting part that separates a connection line between the level adjustment part on the exchange switch side of the transmission/reception line and the connection part to which the additional circuit is level-adjusted and connected, and drawn out to the outside. The trunk line device according to item 1.