JP3439094B2 - Line connection method and line connection device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line connection method and a line connection device, and more particularly to a line connection method and a line connection device for connecting a device to a digital line having a polarity, for example.

[0002]

2. Description of the Related Art Conventionally, a digital line connecting a PHS public base station has a polar metallic line (2 lines / pair).
Therefore, it is necessary to pay attention to the polarity when connecting the digital line and the PHS public base station. That is, when installing the PHS public base station, it was necessary to confirm the polarity of the digital line to be connected in advance and connect the digital line to a predetermined connection point of the PHS public base station so that the polarities match.

[0003]

If this connection is incorrect, P
The HS public base station cannot establish a link with the PHS network and cannot communicate.

Therefore, a main object of the present invention is to provide a line connecting method and a line connecting device capable of surely connecting a device to a digital line without erroneous polarities.

In order to achieve the above object, the line connecting method according to claim 1 is a line connecting method for connecting a device to a digital line having a polarity, wherein the control means is The digital based on the first connection information
Detecting the connection state between the line and the device (a-
1) and connection abnormality in step (a-1)
When detected, connect the digital line to the device.
Switching step (b-1), and said step
After (b-1), the control means is based on the second connection information.
Check the connection status between the digital line and the device again.
Including the step (b-2) of knowing, the step (b-
In the above 2) until it detects that the connection is normal
Repeat step (b-1) and (b-2) above
The digital line and the device so that the polarities match.
And a step (b) of switching the connection with.

A line connection method according to a second aspect is the line connection method according to the first aspect , wherein the first connection information is used.
Is the current supplied to the device via the digital line
The power supply information regarding the second connection information,
It includes synchronization information regarding synchronization of the container .

The line connection method according to claim 3
In the line connection method according to item 1 , the step (a-
1) open the connection between the digital line and the device
Step (a-2), and polarity of the digital line
The step of detecting (a-3),
(B) shows the detection result in step (a-1) above.
Switch the connection between the digital line and the device according to
It is something .

The line connection method according to claim 4 is
3. In the line connection method according to 3 , the step (a-
The detection result in 1) is given to the control means, and
In step (b), the control means corresponding to the detection result
And the digital line based on the switching instruction from
The connection with the device can be switched.

The line connection method according to claim 5 is
In the line connection method described in 3 , the step (b)
Then, the detection result in step (a-1) is directly
Use to switch the connection between the digital line and the device
It is something.

[0009] line connection method according to claim 6, claim
In the line connection method according to any one of 1 to 5 ,
The device includes a PHS base station .

The line connection method according to claim 7 is the line connection method according to any one of claims 1 to 6,
The digital line includes an ISDN line .

The line connection device according to claim 8 has a polarity.
Line connection device for connecting equipment to the digital line
Connection status between the digital line and the device
Detecting means for detecting the, and the detection result by the detecting means
Depending on the polarity, the digital line and the
The detection means is provided with a switching means for switching the connection with the device.
The stage is used for power supply information related to power supply from the digital line.
Based on the connection status between the digital line and the device.
And disconnect the digital line from the device.
After changing, based on the synchronization information about the synchronization of the device
Re-detect the connection status between the digital line and the device
The switching means includes a control means for
Connect the digital line and the device according to the knowledge
It is to switch.

[0012] line connecting device as claimed in claim 9, claim
8. In the line connection device according to 8, the detection means is
Line opening means for opening the digital line, the digital
Polarity that detects the polarity of the digital line when the line is opened
The detection means and the detection result by the polarity detection means.
The digital line and the device so that their polarities are the same.
And a control means for instructing switching of connection with
The means is responsive to an instruction from the control means for the digital
The connection between the line and the device is switched .

A line connecting device according to a tenth aspect is the line connecting device according to the eighth aspect , wherein the detecting means is
Line opening means for opening the digital line, and
Detects the polarity of the digital line when the digital line is opened
The polarity detection means, and the switching means includes the polarity detection means.
The digital line and the device according to an instruction from the output means.
To switch the connection with .

[0014] line connecting device as claimed in claim 11, wherein
In the line connection device according to any one of Items 8 to 10 , the device includes a PHS base station .

The line connecting device as claimed in claim 12, wherein
Item 12. In the line connection device according to any one of Items 8 to 11 , the digital line includes an ISDN line.
It

[0016] Incidentally, the "data
"Detection of connection status between digital line and device"
Line polarity detection ”is included.

[0017]

[0018]

[0019]

[0020]

[0021]

[0022]

[0023]

[0024]

[0025]

[0026]

[0027]

[0028]

[0029]

[0030]

[0031]

[0032]

[0033]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

Referring to FIG. 1, a line connection device 10a according to an embodiment of the present invention is for connecting a device 14 to a digital line 12 having a polarity such as an ISDN line. The device 14 is a DSU (Digital Servic
e Unit) 16 and a terminal device 18 connected thereto, and thus the line connection device 10a connects the digital line 12 and the DSU 16.

Here, the DSU 16 is a kind of line terminating device and is also called a digital line terminating device or a home line terminating device, and has a speed and a format for transmitting a digital signal sent from the terminal device 18 through the digital line 12. It is a device that performs conversion. For example, when the DSU 16 is installed in the user's house, the digital line 12 is 144 kbps between the DSU 16 and the subscriber line terminal equipment (SLT) installed in the central office by the 320 kbps ping-pong transmission method.
(2B + D) bidirectional communication is performed. In the following, DSU
The polarity of 16 will be described on the assumption that the line L2 side is positive (+) and the line L1 side is negative (-).

The line connecting device 10a includes a terminal board 20,
The terminal board 20 includes, for example, metallic wires (2 wires / pair).
Is connected to the digital line 12. The digital line 12 is connected to the polarity switching circuit 22 via the terminal board 20, and the polarity switching circuit 22 is connected to the DSU 16. The polarity switching circuit 22 switches the polarity of the digital line 12 connected to the DSU 16. The power supply information and the synchronization information from the DSU 16 are given to the control circuit 24,
The control circuit 24 controls the polarity switching circuit 22 according to the information.
Instruct to switch polarity. As described above, the power supply information and the synchronization information are used to determine the polarity of the digital line 12 and the DS.
This is because if the polarity of U16 is opposite, there will be no power supply from the digital line 12 and no signal will be received, making it impossible to receive data or make a call. Therefore, the control circuit 24 determines the connection state between the digital line 12 and the DSU 16, that is, the polarity of the digital line 12 based on the power supply information and the synchronization information, and issues a polarity switching instruction.

The line connection device 10a configured as described above
The operation will be described with reference to FIG.

First, the control circuit 24 controls the DSU 16
Based on the power feeding information from the digital circuit 12, it is monitored whether the power feeding from the digital line 12 is cut off for a predetermined time or longer (step S1). If the power supply is not cut off for a predetermined time or longer, the power supply is continuously monitored. If it is detected that the power supply is cut off for a predetermined time or longer, the control circuit 24 issues a polarity switching instruction to the polarity switching circuit 22, The polarity is switched by the polarity switching circuit 22 (step S3). After the polarity is switched, the DSU is controlled within a predetermined time by the control circuit 24.
It is monitored whether synchronization is established in 16 (step S).
5).

If synchronization is not established by the DSU 16 even after the lapse of a predetermined time, the process returns to step S3 and the control circuit 2 is restarted.
A polarity switching instruction is issued from 4 to the polarity switching circuit 22, and the polarity is switched.

On the other hand, when the synchronization is established within the predetermined period, the process ends.

According to the line connection device 10a which operates as described above, the connection state between the digital line 12 and the DSU 16, that is, the polarity of the digital line 12 is automatically judged based on the power supply information and the synchronization information from the DSU 16. Since the polarity of the digital line 12 is switched according to the result, it is not necessary to judge the polarity when installing the device 14, the installation work of the device 14 is facilitated, and the work efficiency can be improved.

Further, referring to FIG. 3, in a line connection device 10b according to another embodiment of the present invention, a line opening circuit 26 and a polarity detecting circuit 28 are provided between the terminal board 20 and the polarity switching circuit 22. It has been inserted. That is, the terminal board 2
One end of 0 is connected to the polarity switching circuit 22 or the polarity detection circuit 28 by the line opening circuit 26. The control circuit 24 gives a line opening instruction to the line opening circuit 26.

The polarity detection circuit 28 includes a photocoupler 30, which is composed of a photodiode 32 and a phototransistor 34. A resistor 36 is connected between the cathode of the photodiode 32 and the line open circuit 26, and a diode 37 for reverse voltage protection is connected in series to the anode of the photodiode 32. The emitter of the phototransistor 34 is grounded, and the collector of the phototransistor 34 is connected to the power supply voltage VCC via a resistor. The phototransistor 34 is turned on by the light from the photodiode 32, and the collector output of the phototransistor 34 is given to the control circuit 24 as a polarity detection result.

Here, when the terminal B is positive (+), a current flows through the photodiode 32, and a polarity detection result indicating that the polarity is opposite is given to the control circuit 24 through the photocoupler 30. Based on the polarity detection result, the control circuit 24 instructs the polarity switching circuit 22 to switch the polarity so as to reverse the polarity of the digital line 12.

The other structure of the line connection device 10b is the same as that of the line connection device 10a, and the description thereof is omitted.

The line connection device 10b configured as described above
The operation will be described with reference to FIG.

First, the control circuit 24 to the line opening circuit 26
An instruction to open the line is issued to the digital line 12, and the digital line 12 is connected to the polarity detection circuit 28 (step S11).

Then, the polarity detection circuit 28 detects the power supply polarity in the state where the digital line 12 is opened, that is, in the initial state (step S13).

The detection result is given from the polarity detection circuit 28 to the control circuit 24, and the control circuit 24 instructs the polarity switching circuit 22 to switch the polarity according to the detection result, and switches the polarity (step S15). ). That is, if the polarities of the digital line 12 and the DSU 16 match, the polarities of the digital line 12 cannot be switched, and if the polarities of the digital line 12 and the DSU 16 are opposite, the polarities of the digital line 12 are reversed. Can be switched.

From the control circuit 24 to the line opening circuit 2
6 is instructed to end the line release, the digital line 12 is connected to the polarity switching circuit 22 (step S17), and the process ends.

According to the line connection device 10b which operates in this manner, the polarity of the digital line 12 is automatically judged according to the detection result of the power supply polarity by the polarity detection circuit 28,
Since the polarity of the digital line 12 is switched according to the result, it is not necessary to confirm the polarity when installing the device 18, the installation work of the device 18 is facilitated, and the work efficiency can be improved.

Further, since the polarity of the digital line 12 itself can be detected by the polarity detection circuit 28, the polarity of the digital line 12 can be accurately switched according to the detection result.

The photodiode 32 and the diode 37 of the polarity detection circuit 28 may be connected in the opposite direction to the case of FIG. 3 so that the current flows when the terminal A side is positive (+). At this time, the control circuit 24, when the collector output of the phototransistor 34 is Low,
A polarity switching instruction is issued so that the polarity of the digital line 12 is reversed.

In FIG. 4, the order of step S15 and step S17 may be exchanged.

Further, referring to FIG. 5, in the line connection device 10c according to another embodiment of the present invention, the polarity of the digital line 12 and the polarity of the DSU 16 are the same or opposite, or the digital line 12 is the same. Is to detect whether the wire is broken.

The line connection device 10c uses the polarity detection circuit 38 as a polarity detection circuit, and except that the control circuit 24 issues a polarity switching instruction based on the detection result from the polarity detection circuit 38. Since it is similar to the above, duplicate description will be omitted.

In addition to the photocoupler 30, the polarity detection circuit 38 includes a photocoupler 40 that reacts when the point A side is positive (+). The photo coupler 40 is the photodiode 4
2 and a phototransistor 44, the photodiode 42 is connected in parallel and reversely to the photodiode 32, the emitter of the phototransistor 44 is grounded, and the collector is connected to the power supply voltage VCC through a resistor.

Therefore, in the polarity detection circuit 38, when the point A side is positive (+), current flows through the photodiode 42, the phototransistor 44 becomes conductive, and the phototransistor 44 "A point side is positive (+)". Is output to the control circuit 24 as a detection result. On the other hand, when the point B side is positive (+), the photodiode 32
Current flows through the phototransistor 34, the phototransistor 34 becomes conductive, and "B
Phototransistor 34 that the point side is positive (+)
Is output to the control circuit 24 as a detection result. Further, when the digital line 12 is disconnected, no current flows through the photodiodes 32 and 34, and neither of the phototransistors 34 and 44 is conductive. Therefore, neither the detection result that "the point A side is positive (+)" nor the detection result that "the point B side is positive (+)" is given to the control circuit 24, and at that time, the control circuit 24 It is determined that the digital line 12 is disconnected, and the polarity switching circuit 22 is not instructed to switch the polarity.

According to the line connection device 10c, in addition to the effect of the line connection device 10b, it is possible to detect the presence or absence of disconnection of the digital line 12.

Further, referring to FIG. 6, a line connection device 10d according to another embodiment of the present invention is provided with a polarity detection circuit 4
The detection result of 6 is directly given to the polarity switching circuit 48 without giving it to the control circuit 24, and a polarity switching instruction is given. For other configurations, the line connection device 10b
Since it is almost the same as the above, the overlapping description will be omitted.

The polarity detection circuit 46 includes a photo coupler 50. The photocoupler 50 includes a photodiode 52 and a phototransistor 54.
A resistor 56 is connected between the cathode and the line opening circuit 26, and a diode 57 for reverse voltage protection is connected in series to the anode of the photodiode 52. The collector of the transistor 58 is connected to the emitter of the phototransistor 54, and the coil 60 of the polarity switching circuit 48 is connected to the collector of the phototransistor 54. A pulse signal is given to the base of the transistor 58 from the control circuit 24 at a predetermined timing, and the polarity is determined at the generation timing of this pulse signal. Note that the transistor 58
The emitter of is grounded.

The polarity switching circuit 48 is constructed by using, for example, a latching relay. One ends of the coils 60 and 62 of the polarity switching circuit 48 are respectively connected to the power supply voltage VCC, and the coils 60 and 62 are respectively connected in parallel with the diodes 61 and 63 for absorbing back electromotive force at the time of switching.

When the polarity is detected, the control circuit 24 gives the polarity switching circuit 48 an initialization instruction for initializing the connection. At this time, the coil 62 is excited so that the point A side becomes positive (+), that is, the point A is on the line L2,
The polarity switching circuit 48 is set so that the point B is connected to the line L1.

In the polarity detection circuit 46, when the point B side is positive (+), a current flows through the photodiode 52,
The phototransistor 54 becomes conductive. In this case, the coil 60 is excited by the collector output of the phototransistor 54 so that the point B side becomes positive (+), that is,
The polarity switching circuit 48 is set so that the point B is connected to the line L2 and the point A is connected to the line L1.

The line connection device 10d configured as described above
The operation will be described with reference to FIG.

First, the control circuit 24 to the line opening circuit 26
An instruction to open the line is issued to the digital line 12, and the line open circuit 26 disconnects the digital line 12 from the DSU 16 side and connects the digital line 12 to the polarity detection circuit 46. At this time, at the same time, an initialization instruction from the control circuit 24 sets the polarity switching circuit 48 to the initial state, that is, the point A is connected to the line L2 and the point B is connected to the line L1 (step S21). ).

Then, the polarity detection circuit 46 detects the power supply polarity when the digital line 12 is open (step S23).

A polarity switching instruction according to the detection result is directly given from the polarity detection circuit 46 to the polarity switching circuit 48, and the polarity switching circuit 48 switches the polarity (step S25). That is, the polarity of the digital line 12 and the DSU
If the polarities of 16 match, the polarities of the digital line 12 cannot be switched, and the polarities of the digital line 12 and the DSU
If the polarity of 16 is opposite, the polarity of the digital line 12 is switched.

Here, when the point B side is positive (+), that is, when the reverse polarity is detected, a current flows in the photodiode 52, the coil 60 is excited by the collector output of the phototransistor 54, and the digital line 12 of the digital line 12 is excited. It is switched so that the polarities are reversed. On the other hand, digital line 1
When the connection of 2 is correct, the coil 60 is not excited, the polarity is not switched, and the initial state remains.

From the control circuit 24 to the line opening circuit 2
6 is instructed to end the line release, the digital line 12 is connected to the polarity switching circuit 48 (step S27), and the process ends.

According to the line connecting device 10d which operates as described above, the polarity of the digital line 12 is automatically judged according to the detection result of the power supply polarity by the polarity detection circuit 46,
Since the polarity of the digital line 12 is switched according to the result, it is not necessary to confirm the polarity when installing the device 18, the installation work of the device 18 is facilitated, and the work efficiency can be improved.

Further, since the polarity of the digital line 12 itself can be detected by the polarity detection circuit 46, the polarity of the digital line 12 can be accurately switched according to the detection result.

Note that, in FIG. 7, the order of step S25 and step S27 may be exchanged.

Further, referring to FIG. 8, in the line connection device 10e according to another embodiment of the present invention, the polarity of the digital line 12 and the polarity of the DSU 16 are the same or opposite, or the digital line 12 is the same. Is to detect whether the wire is broken.

The line connecting device 10e uses the polarity detecting circuit 64 as a polarity detecting circuit and does not issue an initialization instruction from the control circuit 24, except for the line connecting device 10d.
Since it is similar to the above, duplicate description will be omitted.

The polarity detection circuit 64 includes, in addition to the photocoupler 50, a photocoupler 66 that reacts when the point A side is positive (+). The photo coupler 66 is the photodiode 6
8 and a phototransistor 70, the photodiode 68 is connected in parallel and reversely to the photodiode 52, the emitter of the phototransistor 70 is connected to the collector of the transistor 58, and the phototransistor 7
The collector of 0 is connected to the coil 62 of the polarity switching circuit 48.

Therefore, in the polarity detection circuit 64, when the A point side is positive (+), a current flows through the photodiode 68, the phototransistor 70 becomes conductive, and the phototransistor 70 "A point side is positive (+)". The coil 62 is excited by the collector output of, and the point A side becomes positive (+), that is, the point A is on the line L2,
The polarity switching circuit 48 is set so that the point B is connected to the line L1.

On the other hand, when the point B side is positive (+), a current flows through the photodiode 52 and the phototransistor 54.
So that the coil 60 is excited by the collector output of the phototransistor 34 that "the point B side is positive (+)" and the point B side is positive (+), that is, B
The polarity switching circuit 48 is set so that the point is connected to the line L2 and the point A is connected to the line L1. further,
When the digital line 12 is disconnected, no current flows through the photodiodes 52 and 68, and neither of the phototransistors 54 and 70 is conductive.
Therefore, neither of the coils 60 and 62 is excited, and the polarity switching circuit 48 is not instructed to switch the polarity.

According to the line connection device 10e, in addition to the effect of the line connection device 10d, the effect that the presence or absence of disconnection of the digital line 12 can be detected is obtained.

Further, referring to FIG. 9, line connection device 10f according to still another embodiment of the present invention uses polarity detection circuit 72 arranged between terminal board 20 and line opening circuit 26. , Polarity of digital line 12 and DSU16
It is to detect whether or not the polarity is the same as or opposite to, or whether the digital line 12 is broken.

The line connecting device 10f is the same as the line connecting device 10e except that the polarity detecting circuit 72 is used as the polarity detecting circuit, and therefore the duplicated description will be omitted.

The polarity detection circuit 72 includes a photocoupler 74 which reacts when the point A side is positive (+) and a photocoupler 76 which reacts when the point B side is positive (+).

The photocoupler 74 includes the photodiode 7
8 and a phototransistor 80. The anode of the photodiode 78 is connected to the terminal plate 20, the cathode is connected to the line opening circuit 26, the collector of the phototransistor 80 is connected to the coil 62, and the emitter is connected to the collector of the transistor 82.

The emitter of the transistor 82 is grounded,
A pulse signal is given from the control circuit 24 to the base at the timing when the opening instruction is issued.

The photocoupler 76 also includes a photodiode 84 and a phototransistor 86. The photodiode 84 is connected in parallel and reversely to the photodiode 78, and the collector of the phototransistor 86 is connected to the coil 60 and the emitter thereof is connected to the collector of the transistor 82.

Therefore, in the polarity detection circuit 72, when the point A side is positive (+), a current flows through the photodiode 78, the phototransistor 80 becomes conductive, and the phototransistor 80 "point A side is positive (+)". The coil 62 is excited by the collector output of, and the point A side becomes positive (+), that is, the point A is on the line L2,
The polarity switching circuit 48 is set so that the point B is connected to the line L1.

On the other hand, when the point B side is positive (+), a current flows through the photodiode 84 and the phototransistor 86
Is conducted, and the coil 60 is excited by the collector output of the phototransistor 86 saying that the point B side is positive (+), and the point B side is positive (+), that is, B
The polarity switching circuit 48 is set so that the point is connected to the line L2 and the point A is connected to the line L1.

Further, when the digital line 12 is disconnected, no current flows through the photodiodes 78 and 84, the phototransistors 80 and 86 do not conduct, and the polarity switching circuit 48 is switched to the other polarity. No instructions given. When the opening instruction is released and the connection between the digital line 12 and the DSU 16 is started, the output of the pulse signal is stopped.

According to the line connection device 10f, the same effect as that of the line connection device 10e can be obtained. This prevents unnecessary switching due to the current flowing through the photodiode 78 or 84 during connection.

In the line connection device 10f, the collector outputs of the phototransistors 80 and 86 are given to the control circuit 24 as the polarity detection result, and the control circuit 24 switches the polarity to the polarity switching circuit 48 based on the polarity detection result. You may make it give an instruction. In this case, coil 6
0 and 62 and diodes 61 and 63 are no longer needed.

In the line connection devices 10b to 10f, solid state relays (SSR) may be used instead of the photo couplers.

The solid-state relay is a semiconductor relay, has an input terminal and an output terminal, and is insulated by a photocoupler between them. By applying voltage or current to the input side, the phototransistor (or phototriac or photothyristor) on the output side is turned on, and current flows to the output side.

In the line connection devices 10d to 10f,
Although the latching relay is used in the polarity switching circuit 48, other relays such as a normal relay and a solid state relay may be used instead of the latching relay.

Further, in the above embodiment, the DSU16
Although the polarities of 1 and 2 have been described on the assumption that the line L2 side is positive (+) and the line L1 side is negative (-), it will be easily understood even when the polarity of the DSU 16 is set to the opposite.

The line connection device 10 configured as described above.
Specifically, a to 10f are used as follows.

As shown in FIGS. 10 to 12, the line connection devices 10a to 10f may be used to connect the digital line 12 and the PHS public base station.

In the example of FIG. 10, the line connecting devices 10a to 1
0f is built in the PHS public base station 88a, and DSU1
6, connected to an antenna 94 via a line interface 90 and a wireless interface 92.

In the example of FIG. 11, the line connecting devices 10a to 1
0f is externally attached to the PHS public base station 88b.

In the example of FIG. 12, the line connecting devices 10a to 1
0f and DSU 16 are externally attached to the PHS public base station 88c. In FIG. 12, the line connection device 10a
-10f and the DSU 16 may be integrated into a DSU with a polarity matching function.

Further, as shown in FIG. 13, the line connection devices 10a to 10f may be used to connect the digital line 12 and the terminal adapter 96.

In the terminal adapter 96, the line connection devices 10a to 10f receive the digital port interface 97 and the digital port 98 via the DSU 16,
It is connected to an analog port interface 100 and an analog port 102 that convert a digital line into an analog line.

Also in this case, as in the case of the PHS public base station shown in FIGS. 11 and 12, the line connection devices 10a ...
10f and DSU16 may be attached externally.

Further, as shown in FIG. 14, the line connection devices 10a to 10f may be used to connect the digital telephone 104, the digital fax 106 and the like to the digital line 12. In this way, the line connection devices 10a-
10f is used to connect any device to the digital line 12 as long as the device is connected to the digital line 12.

In the specific example shown in FIGS. 10 to 14, the line connection devices 10a to 10f can be connected to the digital line 12 without paying attention to the polarity at the time of connection.

Therefore, the line connecting devices 10a to 10f
According to, the automatic digital line such as ISDN line 1
The polarity of 2 is determined, and the polarity of the digital line 12 is switched according to the result. Therefore, it is not necessary to determine the polarity when the device 14 such as a PHS public base station, terminal adapter, or other digital device is installed. The installation work of the device 14 is facilitated, and the work efficiency can be improved.

[0106]

According to the present invention, it is not necessary to judge the polarity when connecting a device to a digital line, and the device can be reliably connected to the digital line without erroneous polarity. Therefore, the installation work of the device becomes easy, and the work efficiency can be improved.

[Brief description of drawings]

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

FIG. 2 is a flowchart showing an operation in the embodiment of FIG.

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

FIG. 4 is a flowchart showing an operation in the embodiment of FIG.

FIG. 5 is a block diagram showing another embodiment of the present invention.

FIG. 6 is a block diagram showing still another embodiment of the present invention.

FIG. 7 is a flowchart showing an operation in the embodiment of FIG.

FIG. 8 is a block diagram showing another embodiment of the present invention.

FIG. 9 is a block diagram showing another embodiment of the present invention.

FIG. 10 is a block diagram showing a specific example in which the present invention is used.

FIG. 11 is a block diagram showing another specific example in which the present invention is used.

FIG. 12 is a block diagram showing another specific example in which the present invention is used.

FIG. 13 is a block diagram showing still another specific example in which the present invention is used.

FIG. 14 is a block diagram showing another specific example of the present invention.

[Explanation of symbols]

10a to 10f Line connection device 12 digital lines 14 equipment 16 DSU 18 terminal equipment 20 terminal board 22, 48 polarity switching circuit 24 Control circuit 26 circuit open circuit 28, 38, 46, 64, 72 Polarity detection circuit 88a-88c PHS public base station

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04L 25/02 H04M 11/00 303

Claims (12)

(57) [Claims] 1. A line connection method for connecting a device to a digital line having polarity, wherein the control means is based on the first connection information.
And (a-1) detecting a connection state between the device and the device
And the abnormal connection was detected in the step (a-1).
When switching the connection between the digital line and the device
Step (b-1), and the step (b-1)
After that, the control means determines the data based on the second connection information.
The system detects the connection status between the digital circuit and the device again.
Including the step (b-2), the smell in the step (b-2)
The above steps until it detects that the connection is normal.
By repeating (b-1) and (b-2), the polarity is
Connect the digital line and the device so that they match.
A wiring connection method comprising a step (b) of switching . 2. The first connection information is the digital line.
Supply information about the current supplied to the device via
And the second connection information is the same regarding synchronization of the device.
The line connection method according to claim 1, including period information . 3. The step (a-1) comprises:
The step of releasing the connection between the device line and the device (a-
2), and a step for detecting the polarity of the digital line.
(A-3), and the step (b) includes the step
According to the detection result in step (a-1), the digital
The line connection method according to claim 1, wherein connection between a line and the device is switched . 4. The detection result in the step (a-1).
The result is given to the control means, and in the step (b),
Switching instruction from the control means according to the detection result
Disconnection between the digital line and the device
The line connection method according to claim 3, which is changed . 5. In the step (b), the step
The digital result is obtained by directly using the detection result in (a-1).
The line connection method according to claim 3 , wherein connection between a line and the device is switched . 6. The device comprises a PHS base station.
The line connection method according to any one of 1 to 5 . 7. The digital line includes an ISDN line.
The line connection method according to any one of claims 1 to 6 . 8. A device is connected to a polar digital line.
A line connection device for detecting the connection state between the digital line and the device.
Polarity according to the detection means and the detection result by the detection means
Connection between the digital line and the device so that
A switching means for switching between, and the detection means relates to power supply from the digital line.
The connection between the digital line and the device is based on the power supply information.
Detecting the continuity state and connecting the digital line and the device
Sync information about syncing the device after switching connections
Based on the connection status of the digital line and the device
The switching means includes control means for detecting again.
The digital line and the device according to the detection result of the means.
A line connection device characterized by switching the connection with. 9. The detection means opens the digital line.
Line releasing means for releasing, the above when the digital line is released
Polarity detection means to detect the polarity of the digital line, and before
The polarities match according to the detection result by the polarity detection means.
To switch the connection between the digital line and the device
The switching means includes control means for instructing,
Between the digital line and the device according to an instruction from the stage
The line connection device according to claim 8, which switches connection. 10. The detection means connects the digital line.
Line opening means for opening, and opening of the digital line
Sometimes polarity detection means to detect the polarity of the digital line
Including, the switching means, to the instruction from the polarity detection means
Switch the connection between the digital line and the device according to
The line connection device according to claim 8 . 11. The device comprises a PHS base station.
Item 11. The line connection device according to any one of items 8 to 10 . 12. The digital line includes an ISDN line.
The line connection device according to any one of claims 8 to 11 .