JPH10271243A - Lan telephone set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a LAN(local area network) telephone set capable of being serviced to a line wire even in the case of the occurrence of a fault in a LAN or the service interruption of a commercial power supply system. SOLUTION: A LAN interface circuit part 120 periodically monitors a state inquiry packet from a LAN private branch exchange; and if it does not receive this state inquiry packet, it discriminates the occurrence of a fault in the LAN and switches a relay 141 from a terminal A (ADPCM encoding/decoding part 121) to a terminal B (PSTN public switching telephone network) by the control signal,. The relay 141 switches a service interface part 142 to PSTN at the time of power failure of a commercial power.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a LAN (Local Area Network) private branch exchange network.
Related to AN telephone.

[0002]

2. Description of the Related Art Generally, a local area network (LAN) is
N telephones are used as extension telephones, and public networks such as ISDN (Integrated Services Digital Network) and PSTN
2. Description of the Related Art A LAN private branch exchange network to which a public switched telephone network is connected as an outside line is known.

[0003]

However, the conventional LAN telephone has a problem in that when a failure occurs in the LAN, not only internal telephone calls but also external telephone calls become impossible. Also, unlike a PSTN telephone that is normally supplied with power from a PSTN, a LAN telephone is supplied with power from a commercial power supply, so that there is a problem in that external telephone calls cannot be made during a power failure.

The present invention has been made in view of the above-mentioned conventional problems, and
It is an object of the present invention to provide a LAN telephone capable of making an external call even if a failure occurs in the telephone. Another object of the present invention is to provide a LAN telephone capable of making an outside-line call even when a commercial power supply is interrupted.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a public telephone network interface for performing call control and communication control with a public telephone network, and performs communication when a failure on a LAN is detected. The route is switched from the LAN to the public telephone network interface. The present invention further provides a public telephone network interface for performing call control and communication control with the public telephone network, and switches a communication path from a LAN to a public telephone network interface when a commercial power supply is interrupted.

That is, according to the present invention, a fault detecting means for detecting a fault on a LAN, a public telephone network interface for performing call control and communication control with a public telephone network, and the fault detecting means comprising: And a line switching means for switching a communication path from the LAN to the public telephone network interface when the telephone line is detected.

Further, according to the present invention, a power failure detection means for detecting a power failure of a commercial power supply, a public telephone network interface for performing call control and communication control with a public telephone network, and the power failure detection means comprising a power failure of a commercial power supply LA is detected when a call is detected
And a line switching means for switching from N to the public telephone network interface.

According to the present invention, a fault detecting means for detecting a fault on a LAN, a power failure detecting means for detecting a power failure of a commercial power supply, and a public telephone network for performing call control and communication control with a public telephone network. When the fault detecting means detects a fault on the LAN, or when the power failure detecting means detects a power failure of the commercial power supply, the communication path is switched to the LA.
And a line switching means for switching from N to the public telephone network interface.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a LAN (Local Area Network) private branch exchange network to which an embodiment of a LAN telephone according to the present invention is applied;
FIG. 2 is a block diagram showing the PSTN-compatible LAN telephone of FIG. 1 in detail.

[0010] The LAN 1 shown in FIG.
-T is a network composed of cables such as
The audio signal on LAN1 is ADPCM or LD CEL
P (G.728) or the like is transmitted in a voice packet including a code voice signal. LAN1 has an extension telephone terminal L
AN telephones 10-1, 10-2, and 10-3, ISDN (Integrated Services Digital Network) gateway 13 and PSTN (Public Switched Telephone Network) gateway 1 as terminal devices
5 and a LAN private branch exchange 17 for controlling exchange of the LAN 1
Is connected.

The ISDN gateway 13 performs a protocol conversion between the ISDN 30 which is a digital public communication network and the LAN 1, and the PSTN gateway 15 performs a protocol conversion between the PSTN 31 which is an analog telephone network and the LAN 1. Also, in this example, the LAN telephones 10-2, 1
0 to 3 are connected to the PSTN 31 and the ISDN 30, respectively.

FIG. 2 shows a PSTN-compatible LAN telephone 10-.
2, the LAN telephone 10-2 is supplied with power from a commercial power supply, and a LAN interface 101 for inputting / outputting a LAN packet including a call control packet and a voice packet from / to the LAN 1 as an interface with an external device. A commercial power supply connector 102 and a PSTN 31 as a backup for when a failure occurs in the LAN 1 or when a commercial power outage occurs.
And a handset interface 104 connected to the handset 10a.

The LAN interface circuit section 120 has a control CPU for controlling the LAN 1 and for controlling the LAN 1 and the LAN.
Analysis of LAN packets input / output via the interface 101 is performed. ADPCM encoding / decoding unit 12
Reference numeral 1 denotes an ADPCM encoding of the analog transmission audio signal from the terminal A of the relay 141 and transmission to the LAN interface circuit unit 120, and decoding of the ADPCM code received via the LAN interface circuit unit 120 into an analog audio signal. Output to terminal A of relay 141. The power supply unit 122 rectifies the AC commercial power supplied through the commercial power connector 102 to a constant voltage,
It supplies necessary power to the interface circuit unit 120, the ADPCM encoding / decoding unit 121, the power management unit 140, and the like.

The PSTN interface 103 has a PST
Terminal B of relay 141 is connected via N line accommodating section 130. PSTN line accommodating section 130 is PSTN3
1 to control the network (close the line, send dial signal), terminate the line impedance,
To take out the DC power supply by the station power supply of PSTN31
The analog audio signal input from the relay 141 is output to the terminal B of the relay 141, and the analog audio signal from the terminal B of the relay 141 is output to the PSTN 31. A communication interface unit 142 is connected between the common terminal of the relay 141 and the handset interface 104.

The power management section 140 is provided with the power section 122 or the PS
The power supply from the TN line accommodating section 130 supplies necessary power to the call interface section 142 and the power supply section 12
2 supplies a signal for driving the relay 141 to a coil (not shown) of the relay 141 when the power is supplied from the power supply 2 (the signal indicates a result of detecting the DC power generated by the power supply unit). There). Relay 14
1, when the signal is not supplied from the power management unit 140, that is, at the time of a commercial power failure, the communication interface unit 142 is connected to the terminal B side, that is, the PSTN line accommodation unit 1
When the signal is supplied, that is, when the power is supplied from the commercial power supply, the communication interface unit 142 is connected to the terminal A side, that is, the ADPCM encoding / decoding unit 121 side. I have.

The LAN interface circuit section 120
Monitors the status inquiry packet from the LAN private branch exchange 17 at predetermined time intervals. If the status inquiry packet is not received, it is determined that a failure has occurred in the LAN 1, and a terminal A through terminal A of the relay 141 is determined by the control signal. Switch to B side (signal is LAN private branch exchange 1
7 shows the result of monitoring the status inquiry packet from the server 7 for a fixed period of time. Therefore, when a failure occurs in the LAN 1 or during a power failure, the communication interface unit 142
The switching from the PCM encoding / decoding unit 121 to the PSTN 31 side enables transmission via the PSTN 31. Furthermore, the LAN telephone 10-2 may monitor the failure or measure the traffic amount by itself, and may switch when there is a failure or the traffic is extremely heavy. In this case, a monitoring means is provided in each of the LAN telephones 10-2, and the relay 141
Is configured to be switched.

FIG. 2 shows a PS as a backup line.
Although the LAN telephone 10-2 using the TN 31 has been described, in the case of the LAN telephone 10-3 using the ISDN 30 which is a digital public communication network as a backup line, the PSTN interface 103 and the PSTN shown in FIG.
An ISDN interface and an ISDN for performing call control and communication control of the ISDN 30 instead of the TN line accommodating unit 130
By providing the DN line accommodation unit, the ISDN 30 can be used as a backup line.

[0018]

As described above, according to the present invention, a public telephone network interface for performing call control and communication control with the public telephone network is provided, and when a failure on the LAN is detected, the communication path is switched from the LAN. By switching to the public telephone network interface, it is possible to realize a LAN telephone capable of making an external call even if a failure occurs in the LAN. The present invention also provides a public telephone network interface for performing call control and communication control with the public telephone network, and switches the communication path from the LAN to the public telephone network interface when the commercial power is interrupted. Thus, it is possible to realize a LAN telephone that can perform an outside line call.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a LAN (Local Area Network) private branch exchange network to which an embodiment of a LAN telephone according to the present invention is applied.

FIG. 2 is a block diagram showing a PSTN-compatible LAN telephone shown in FIG. 1 in detail.

[Explanation of symbols]

10-1, 10-2, 10-3 LAN telephone 30 ISDN 31 PSTN 103 PSTN interface 120 LAN interface circuit section (failure detecting means) 122 Power supply section 130 PSTN line accommodating section (constitutes public telephone network interface with PSTN interface 103) 140 power supply management unit (power failure detection means) 141 relay (line switching means) 142 call interface unit

Claims (3)

[Claims] 1. A failure detecting means for detecting a failure on a LAN, a public telephone network interface for performing call control and communication control with a public telephone network, and when the failure detecting means detects a failure on the LAN. Line switching means for switching a communication path from the LAN to the public telephone network interface. 2. A power failure detection means for detecting a power failure of a commercial power supply, a public telephone network interface for performing call control and communication control with a public telephone network, and a telephone call when the power failure detection means detects a commercial power failure. Line switching means for switching a route from a LAN to the public telephone network interface. 3. A failure detection means for detecting a failure on the LAN, a power failure detection means for detecting a power failure of a commercial power supply, a public telephone network interface for performing call control and communication control with a public telephone network, and the failure detection. A line switching means for switching a communication path from the LAN to the public telephone network interface when the means detects a failure on the LAN or when the power failure detection means detects a power failure of a commercial power supply.