JPH1169391A - Circuit interface device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a circuit interface device which can automatically discriminate the type of its connected circuit and is adaptive to plural circuit types by deciding an input circuit of the specific one of plural types and connecting an external device that is adaptive to the input circuit of the decided type. SOLUTION: When a signal is inputted to a circuit type discrimination part 2, the part 2 decides the interface type of the signal that is connected to an input circuit connection part 1. When a circuit type is decided at the part 2, the part 2 gives instructions to switching parts 3 and 4 to connect the circuit to an interface part 10. If it's decided by the circuit type decision result that the circuit connected to the part 1 is equal to an S/T point interface, the part 2 produces an instruction to close only the switching contacts 3-2 and 4-2 with other switching contacts 3-1, 3-3, 3-4, 4-1, 4-3 and 4-4 kept in the open states respectively. Thus, an interface is selected in response to the type of each connected circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line interface device, and more particularly to a line interface device capable of coping with a plurality of types of line signal transmission systems such as data transmission and voice signal transmission.

[0002]

2. Description of the Related Art A conventional line interface device of this type will be described with reference to the drawings.

FIG. 4 is a block diagram showing an example of a device related to a conventional line interface device.

In FIG. 4, this conventional example is disclosed in
No. 57361 shows the contents of disclosure, 101 is an operation panel unit operated and input by an operator, 102 is a digital telephone unit having a digital telephone function, 103 is a handset attached to the digital telephone unit, 104 is a G3 which performs G3 mode communication control A facsimile communication control unit 105 is a G4 facsimile communication control unit that performs G4 mode communication control. The digital telephone unit 102, the G3 facsimile communication control unit 104, and the G4 facsimile communication control unit 105
Data is transmitted and received as necessary using the B channel (64 Kbps) of the ISDN line.

[0005] Further, reference numeral 106 denotes a D channel for controlling the B channel to the digital telephone unit 102, the G3 facsimile communication control unit 104, and the G4 facsimile communication control unit 10.
Connect to 5. 1 which is the ISDN line interface
Reference numeral 07 denotes a tone generation unit that generates a ringing tone when a call arrives, 108 denotes a speaker, 109 and 110 denote scanners and printers for inputting and outputting images during facsimile transmission and reception, and 111 denotes a main control unit that controls the entire apparatus. ,
A CPU 111a for controlling the arithmetic unit, a ROM 111b for storing programs, and a RAM 111c for auxiliary storage are provided.

[0006] The decoding terminal device configured as described above has
Connected to the SDN line to determine whether the call from the ISDN line is from an analog telephone or a G3 facsimile, and based on the determination, connect the call to the digital telephone of the terminal device or the G3 facsimile. Thereby, the call can be connected to the corresponding function without requiring the operation of the operator.

[0007]

This conventional example has the following problems.

A first problem is that the line type that can be supported by the device to be connected must be determined by a person who connects (connects) the line.

[0009] The reason is that the line type corresponding to each device is determined, and when connected to a line other than the specified type, the device cannot operate normally, and in the worst case, the device may be destroyed. There is also. That is, in the conventional example, there are three types of signals that can be received.
This is one type of SDN line.

The second problem is that, for each line type to be connected, a device suitable for the line type must be used, and this is used when the line type is changed or when several types of lines are used properly. It is necessary to change even the equipment to do.

[0011] The reason is that when the equipment is changed, investment is considerably required, and when different equipment is introduced, management (maintenance, repair, etc.) becomes complicated.

A third problem is that the interface point (specifically, outlet (modular jack)) of the line to be connected uses the same one regardless of the line type.

The reason is that it is not easy to determine which type of line is compatible simply by looking at it.
This is because a device that is not compatible may be connected by mistake. (Purpose) It is an object of the present invention to solve these problems, to automatically determine the type of a connected line, and to provide a line interface device suitable for a plurality of line types.

[0014]

SUMMARY OF THE INVENTION A line interface device according to the present invention comprises an analog telephone line, an ISDN line, and an L line.
A plurality of types of interface means which can correspond to each of a plurality of types of lines including an AN line; a determination means for determining which type of input line is the input line; and a determination result of the determination means. A connection switching means for selecting an interface means compatible with an input line from the plurality of types of interface means and connecting an external device to an output of the input line at an input of the selected interface means.

A line interface device according to the present invention includes an input line connection unit for physically connecting a line, a device connection unit for physically connecting an external device, and an input line connection unit. The line is an analog telephone line, I
A line type determining unit that determines any one of a plurality of types of lines including an SDN line and a LAN line; an interface unit including a plurality of types of interface corresponding units each having an interface adapted to each of the plurality of types of lines; A first switching unit that switches the input of the interface corresponding unit that matches the line to the input line connection unit based on the determination result of the line type determination unit, and a second switching that switches the output to the device connection unit. Part.

A line interface device according to the present invention includes an input line connection unit for physically connecting a line, a device connection unit for physically connecting an external device, and an input line connection unit. The line is an analog telephone line, I
A line type determining unit that determines any one of a plurality of types of lines including an SDN line and a LAN line; an interface unit including a plurality of types of interface corresponding units each having an interface adapted to each of the plurality of types of lines;
A signal characteristic measurement unit that measures signal characteristics including a speed and a level of a signal input through a signal line based on the result of the determination by the line type determination unit, and a display unit that displays a measurement result of the signal characteristic measurement unit. A first switching unit that switches the input of the interface corresponding unit that matches the line from the measurement result of the signal characteristic measurement unit to the input line connection unit and a second switch that switches the output to the device connection unit. 2 switching units.

[0017]

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

FIG. 1 is a block diagram showing a first embodiment of the present invention, and FIG. 2 is a flowchart showing a procedure for determining a line type in the first embodiment.

In FIG. 1, an input line connection unit 1 for physically connecting a line and a device connection unit 15 for physically connecting an external device (not shown) are shown in FIG. And a line type discriminating unit 2 for discriminating whether the line connected to the input line connecting unit 1 is one of a plurality of types of lines including an analog telephone line, an ISDN line, and a LAN line.
And an interface unit 10 including a plurality of types of interface corresponding units 11 to 14 whose interfaces are adapted to each of the plurality of types of lines, and an interface corresponding unit adapted to the line based on the determination result of the line type determining unit 2. 1 and a switching unit 4 including switching contacts 4-1 to 4-4 for switching connection to the device connection unit 15.

In the first embodiment, the interface section 10 includes a U-point interface corresponding section 11 and an S / T-point interface corresponding section which can be adapted to four types of lines as a plurality of interface corresponding sections. 12 and 1
00BASE-TX interface corresponding units 13 and 10
And a BASE-T interface corresponding unit 14.

The U point interface and the S / T point interface are those recommended in the CCITT I series, respectively, and the 100BASE-TX and 10BASE-T interfaces are 100 Mbit transmission and 10 Mbit transmission LAN, respectively. I for line
This is recommended in the EEE-802.3 series.

Next, the operation of the first embodiment will be described.
This will be described in detail with reference to FIGS.

First, a line is actually connected to the input line connection unit 1. The switching units 3 and 4 are all open (not connected) at this time. When a signal is input to the line type determination unit 2, the line type determination unit 2 determines which interface type the signal connected to the input line connection unit 1 is in accordance with the procedure shown in FIG. The procedure of FIG. 2 will be described later in detail.

When the line type is determined by the line type determining unit 2, the line type determining unit 2 instructs the switching units 3 and 4 to connect the line to the interface unit 10. As a result of the determination of the line type, the line connected to the input line connection unit 1
If it is a point interface, the line type discriminating unit 2
Indicates that only the switching contact 3-2 and the switching contact 4-2 are closed, and the other switching contacts are kept open. As a result, the interface corresponding to the connected line type is selected.

Similarly, 10 BASE-
When the T interface is connected, the line type discriminating unit 2 issues a "close" instruction to the switching contacts 3-3 and 4-3, and leaves the other switching contacts open.

Next, the procedure for determining the line type will be described.

In FIG. 2, first, it is always determined whether or not a line is connected to the input line connection unit 1 (S1).
01). When the line is connected, the state transits to the next state (S
102). In this state, it is determined whether or not the connected line is the U point interface. For this determination,
It is determined whether power is supplied from a station (phantom power supply) to the line, and if power supply is detected, the state transits to the next state (S103). In this state, it is S
/ T point must be determined. First, when a frame signal (377 bits) of 1.178 msec per burst is detected to determine whether or not the point is the U point and the frame synchronization is established by the frame synchronization bit (8 bits), this connected line is It is determined that the interface is a U point interface. If no valid signal is detected at this time, the state transits to the next state (S103-1). In this state, it is determined whether or not the point is the S / T point. First, 48 bits
If a (250 ns) frame is detected and frame synchronization is established, it is determined that the connected line is an S / T point interface. If no frame is detected or frame synchronization is not established at this time,
It is determined that there is something wrong with the line, and an error occurs as a line type that cannot be determined by this procedure.

If no power is detected on the line in S102, it is determined whether or not the line is an S / T point interface. If a valid signal (synchronous signal) can be detected here, it is determined that the connected line is an S / T point interface. Here, if no valid signal is detected, the state transits to the next state (S105). Here, it is determined whether or not the connected line is 100BASE-TX. Here, when a valid 100BASE-TX signal (link pulse) is detected, the connected line becomes 100
It is determined that it is the BASE-TX interface.

If no valid signal is detected here, the state transits to the next state (S106). Here, it is determined whether or not the connected line is a 10BASE-TX interface. Valid signal here (link pulse)
Is detected, the connected interface is 10B
It is determined that it is ASE-T. If a valid signal cannot be detected, it is determined that the line is not compatible, and an error is generated.

Next, a second embodiment of the present invention will be described with reference to the drawings.

FIG. 3 is a block diagram showing a second embodiment of the present invention.

In FIG. 3, in the second embodiment, the same components as those in the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and different requirements are connected to the input line connection unit 1. A line type discriminator 21 for judging the type of line, and a characteristic of an input signal input through the line type judging unit 21 is measured, and switching is performed based on the measurement result and the line type signal from the line type discriminator 21. It has a signal characteristic measuring unit 23 for controlling the units 3 and 4 and a display unit 24 for displaying information of measurement results from the signal characteristic measuring unit 23.

The measurement items of the signal characteristic measuring unit 23 include the speed and level of the input signal and the type (N
RZ, RZ, etc.).

Next, the operation of the second embodiment will be described with reference to FIG.

The type of the line connected to the input line connecting unit 1 is determined by the line type determining unit 22 according to the procedure shown in FIG. Based on the determination result, the signal characteristic measuring unit 23 measures the characteristics of the input signal using necessary parameters, displays the information on the result on the display unit 24, and, based on the result of the characteristic of the input signal, determines the switching unit 3 , 4 are controlled. As a result, an interface compatible with the input line is connected.

As described above, according to the first embodiment or the second embodiment,
In this embodiment, since the type of the line to be used is determined by the line type determining unit 2 or the line type determining unit 22 and the signal characteristic measuring unit 23, there is no need for a human to determine the line type.

Further, as a result of the determination of the line type, a connection is made to an interface corresponding unit suitable for the line, so that it is not necessary to prepare another device for the interface.

[0038]

As described above, according to the present invention, a plurality of types of interface means capable of dealing with a plurality of types of lines including an analog telephone line, an ISDN line, and a LAN line, respectively, A discriminating means for discriminating whether the number of times is the number of types, and an interface means which can be adapted to the input line as a result of discrimination by the discriminating means from a plurality of types of interface means; By providing the connection switching means for connecting, the following effects can be obtained.

The first effect is that the type of the line to be connected can be automatically determined.

The reason is that there is provided a determining means for determining the line to be connected.

The second effect is that a plurality of lines of different types can be accommodated by the same model.

The reason is that the type of the line is determined by the discriminating unit, and a plurality of interface units corresponding to the line are provided.

The third effect is that the installation area of the equipment is reduced and the selection of the equipment is facilitated.

The reason is that a single device can handle a plurality of types of lines.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a flowchart illustrating a procedure for determining a line type according to the first embodiment;

FIG. 3 is a block diagram showing a second embodiment of the present invention.

FIG. 4 is a block diagram showing an example of a device related to a conventional line interface device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Input line connection part 2, 22 Line type discrimination part 3, 4 Switching part 10 Interface part 11 U point interface corresponding part 12 S / T point interface corresponding part 13 100BASE-TX interface corresponding part 14 10 BASE-T interface corresponding part 15 Device Connection part 23 Signal characteristic measurement part 24 Display part

Claims (3)

[Claims] 1. A plurality of types of interface means capable of responding to a plurality of types of lines including an analog telephone line, an ISDN line, and a LAN line, and determining which type of the input line is the type of the input line. A switching means for connecting the input line to the input of the selected interface means and connecting the external device to the output of the interface means selected from the plurality of types of interface means. And a line interface device. 2. An analog telephone, comprising: an input line connection unit for physically connecting a line; a device connection unit for physically connecting an external device; and the line connected to the input line connection unit. A line type determining unit for determining any one of a plurality of types of lines including a line, an ISDN line, and a LAN line; and an interface unit including a plurality of types of interface corresponding units each having an interface adapted to each of the plurality of types of lines. A first switching unit that switches connection of an input of the interface corresponding unit that matches the line to the input line connection unit based on a determination result of the line type determination unit, and a second switching unit that switches connection of an output to the device connection unit. A line interface device comprising a switching unit. 3. An analog telephone, comprising: an input line connection unit for physically connecting a line; a device connection unit for physically connecting an external device; and the line connected to the input line connection unit. A line type determining unit for determining any of a plurality of types of lines including a line, an ISDN line, and a LAN line; and an interface unit including a plurality of types of interface corresponding units each having an interface adapted to each of the plurality of types of lines. A signal characteristic measuring unit for measuring a signal characteristic including a speed and a level of a signal input through the line based on a result of the determination by the line type determining unit, and a display unit for displaying a measurement result of the signal characteristic measuring unit. A first switching unit for switching connection of an input of the interface corresponding unit suitable for the line to the input line connection unit based on a measurement result of the signal characteristic measurement unit; A second switching unit for switching connection of a force to the device connection unit.