JPH06315055A - Digital telephone set - Google Patents

Abstract

PURPOSE:To solve a problem of disabling data communication due to the noncoincidence of working channels by attaching a channel selection means to perform the communication of the input/output signal of a data system on a channel B or D. CONSTITUTION:In a digital telephone set provided with a B-channel communication part 11 and a D-channel communication part 13 which perform interface with an automatic private branch exchange, a telephone control means 14 performs channel selection processing by controlling a channel selection part 16. The selection part 16 captures the channel B first when the data system performs transmission, and selects the channel D when it is closed. By employing such constitution, since fast data communication can be performed by capturing the channel B first when the data system performs the transmission, and the communication on the channel D can be performed by an OHCA, etc., by an incoming call side when the channel B is closed. it is possible to prevent a state where the data communication is disabled from occurring due to the noncoincidence or closure of the channel and to improve serviceability for a user.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital telephone which is housed in a private branch exchange through a digital transmission line and has a data system input / output port.

[0002]

2. Description of the Related Art In recent years, ISDN (integrated service di
With the rapid spread of digital networks, digital telephones with 2B + D capability capable of data communication have become essential terminals for private automatic branch exchanges.

A conventional data communication method will be described below with reference to the drawings. FIG. 4 shows a system configuration example of a conventional digital telephone. In FIG. 4, reference numeral 41 denotes a B-channel communication unit of a communication interface that controls B-channel communication with a private branch exchange, and outputs analog voice to a PC.
6 digitally converted by M (pulse code modulation)
64Kbps voice or input / output data of the data terminal connected through the RS-232C input / output port was exchanged rate 64
Kbps data is communicated on B1 channel or B2 channel. 42 is a communication path control unit for realizing B channel communication, 43 is a D channel communication unit of a communication interface that controls D channel communication with a private automatic branch exchange, and includes an LED (light emitting diode) and an LCD (liquid cr
ystaldisply) control, data necessary for exchange processing such as on-hook and off-hook, or input / output data of a data terminal connected via the RS-232C input / output port at 16 Kbps
It is for performing communication on the D channel. Reference numeral 44 is a telephone control unit that controls the terminal interface unit 45, the communication path control unit 42, and the D channel communication unit 43, and 45 is an RS-
It is a terminal interface unit that controls data transmission / reception with a data terminal connected via a 232C input / output port. 46 and 47 are a speaker and a microphone for making a hands-free call. 48 is a handset for making a voice call,
49 is an operation unit consisting of dial buttons and hook switches,
Reference numeral 50 denotes a display unit such as an LED (light emitting diode) or an LCD (liquid crystal display device).

The operation of the conventional data communication method of the digital telephone configured as described above will be described below. In the above-mentioned conventional example, the channel used by the data terminal is either previously downloaded from the private branch exchange or determined in advance by the setting operation of the digital telephone, and the calling operation (for example, the AT command or the calling procedure such as V25bis) is performed. ) Is detected by the terminal interface unit 45 and the telephone control unit 44 is notified. The telephone control unit 44 sends a call origination request event of the terminal to the private automatic branch exchange via the D channel communication unit 43. The private automatic branch exchange which has received the call request event analyzes the call event and performs the calling process of the partner terminal.
Regarding the operation on the receiving side, a call request event is notified to the telephone control unit 44 via the D channel communication unit 43. Response operation
When (for example, AT command or V25bis) is performed, it is detected by the terminal interface unit 45 and is notified to the telephone control unit 44. The telephone control unit 44 sends a response event to the private automatic branch exchange via the D channel communication unit 43. The private automatic branch exchange which has received the response event sends a data communication start event to each data terminal. At this time, which channel is used for data communication is determined in advance by the setting of the private branch exchange or the digital telephone. If it is the B channel, the call path control unit 42 is controlled, and the terminal interface unit 45-the call path control unit 42. -B channel data communication is performed through the path of the B channel communication unit 41. If it is the D channel, the data communication of the D channel is performed through the route of the terminal interface unit 45-D channel communication unit 43. In addition to the above-mentioned calling method, there is a method of calling on behalf of a digital telephone.

As described above, the data communication in the conventional digital telephone can use only the channel predetermined by the setting from the private branch exchange or the telephone. Conventional channel selection uses B channel for high-speed data communication,
It was to use the D channel when performing low-speed data communication.

[0006]

However, the above-mentioned conventional system has a problem that data communication cannot be performed if the calling channel and the called terminal use different channels. In addition, OHCA has become a major function of recent automatic private branch exchanges.
(Off Hook Call Announcement; a service that allows you to receive a voice call using a second channel during a voice call) There is a situation where neither B1 channel nor B2 channel can be used, and the channel used for data communication is The B channel is fast, but sometimes it cannot be used, and the D channel is always available but slow. SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems by providing a digital telephone that captures from the B channel when a data terminal accommodated in the digital telephone makes a call and, if the B channel is blocked, performs data communication using the D channel. It is intended to be provided.

[0007]

In order to achieve the above object, the present invention provides a B channel communication section for controlling an interface with a private automatic branch exchange, a D channel communication section, and a communication path control section for controlling B channel communication. , In addition to the terminal interface section that controls the input / output of the data system and the telephone control section that controls the operation section and display section of the telephone, use the D channel if B channel is selected and B channel is blocked during data communication. That is, the channel selecting section is provided.

[0008]

With the above-mentioned configuration, it is possible to prevent data communication from not being possible due to inconsistency in used channels, and it is not necessary to be aware of the channel during data communication.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A data communication method in a digital telephone according to the present invention will be described below with reference to the drawings. FIG. 1 is a system configuration diagram showing a configuration of a digital telephone according to an embodiment of the present invention. In FIG. 1, reference numeral 11 is a B channel communication section of a communication interface that controls B channel communication with a private automatic branch exchange, and is a 64 Kbps voice obtained by digitally converting analog voice by PCM, or RS-232.
The data of 64 Kbps obtained by rate conversion of the input / output data of the data terminal connected via the C input / output port is communicated by the B1 channel or the B2 channel. Reference numeral 12 is a communication path control unit for realizing B channel communication, and 13 is a D channel communication unit for a communication interface that controls D channel communication with a private automatic branch exchange, for LED and LCD control, and exchange processing such as on-hook and off-hook. This is for communicating necessary data or input / output data of a data terminal connected through an RS-232C input / output port with a 16 Kbps D channel. Reference numeral 14 is a telephone control unit that controls the channel selection unit 16, the communication path control unit 12, and the D channel control unit 13, and 15 controls data transmission / reception with a data terminal connected via an RS-232C input / output port. It is a terminal interface unit. 16 is a channel selection unit for selecting a channel to be used for data communication, 17 and 18 are a speaker and a microphone for making a hands-free call, 19 is a handset for making a voice call, and 20 is an operation consisting of a dial button and a hook switch. Reference numeral 21 denotes a display unit such as an LED (light emitting diode) or LCD (liquid crystal display device).

The operation will be described below with reference to FIGS. 1, 2 and 3. In the above embodiment, the data terminal is used to make a call (for example, an AT command or a calling procedure such as V25bis).
In case of performing, the terminal interface unit 15 detects it and notifies the telephone control unit 14. The telephone control means 14 checks whether or not the B1 channel is used (S ₁ ),
If not used is to supplement the B1 channel (S _6), sets the B1 channel to the calling request information (S _7), with respect to private automatic branch exchange via a D channel communication unit 13 sends a call request event of the terminal (S ₈ ). If the B1 channel is used, check whether the B2 channel is used (S ₂ ),
If not used are by captures B2 channels (S _6), sets the B2 channel to the calling request information (S _7), sends a call request event of the terminal to a private automatic branch exchange via a D channel communication unit 13 Yes (S ₉ ). B2 If the channel is used to set the D-channel to the calling request information (S _3), with respect to private automatic branch exchange via a D channel communication unit 13 sends a call request event of the terminal (S _4). The private automatic branch exchange, which has received the call request event, analyzes the call event and performs the calling process of the partner terminal. In operation the called side, the call request event is notified to the telephone control unit 14 via the D channel communication unit 13 (S _21). The telephone control unit 14 controls the channel selection unit 16 to perform channel selection processing. First, check the used channel information of the call origination information (S
_22), if the B1 or B2 channel, see if its B1 channel is used (S _23), if not used, the B1 channel capture (S _27), the B1 channel to the outgoing request response information Is set (S ₂₈ ), and the transmission request response information is sent to the private automatic branch exchange via the D channel communication unit 13 (S ₂₉ ). If the B1 channel is used, it is checked whether or not the B2 channel is used (S ₂₄ ). If it is not used, the B 2 channel is captured (S ₂₇ ) and the B 2 channel is set in the transmission request response information ( S _28), the outgoing request response information is sent to the private automatic branch exchange via a D channel communication unit 13 (S _29).

When the private branch exchange (S ₅ , S ₉ ) receives the call request response event, the reply event is analyzed and the B channel is designated on the caller side.
(S ₁₀ ) Data communication is performed on the B channel. If the originating side designates the B channel and the responding side designates the D channel, the captured B channel is opened (S ₁₁ ) and data communication is performed on the D channel. If the D channel is specified on the calling side, data communication is performed on the D channel after receiving the calling request response event (S ₅ ). Response operation (eg AT command or V25bis
Etc.) is detected by the terminal interface unit 15 and notified to the telephone control unit 14. Telephone control unit 14 is D
A response event is transmitted to the private branch exchange through the channel communication unit 13. The private automatic branch exchange which has received the response event sends a data communication start event to each data terminal. At that time, if it is the B channel, the communication path control unit
12 to control the terminal interface unit 15-call path control unit 12
-B channel data communication is performed through a path called the B channel communication unit 11. For D channel, terminal interface section
15-D channel data communication is performed through the D channel communication unit 13. In addition to the above-mentioned calling method, there is a method of calling on behalf of a digital telephone.

[0012]

As is apparent from the above-described embodiments, the present invention enables high-speed data communication by capturing from the B channel at the time of transmission of the data system, and the receiving side uses the OHCA etc.
When the channel is not available, the D channel can be used for communication, and there is no problem that data communication cannot be performed due to channel mismatch or channel blockage, and the service that can be provided to the user is improved.

[Brief description of drawings]

FIG. 1 is a functional block diagram of a digital telephone according to an embodiment of the present invention.

FIG. 2 is a flow chart of originating channel selection logic in one embodiment of the present invention.

FIG. 3 is a flow chart of terminating channel selection logic in one embodiment of the present invention.

FIG. 4 is a functional block diagram of a conventional digital telephone.

[Explanation of symbols]

11, 41 ... B channel communication unit, 12, 42 ... Call path control unit,
13, 43 ... D channel communication unit, 14, 44 ... Telephone control unit, 15, 45 ... Terminal interface unit, 16 ... Channel selection unit, 17, 46 ... Speaker, 18, 47 ... Microphone, 1
9,48 ... Handset, 20,49 ... Operation part, 21,50 ... Display part.

Claims (2)

[Claims] 1. A digital telephone having at least one data input / output port and connected to a private automatic branch exchange through an interface comprising two B channels and two D channels, the B channel communication with the private automatic exchange. And communication interface means for controlling D channel communication, and terminal interface means for controlling input / output of data to / from a terminal connected via a data input / output port,
Telephone control means for controlling the operation portion and display portion of the telephone, and the voice on the B channel to the speaker, microphone,
It comprises a communication path control means for controlling the connection to the handset and a channel selection means for communicating the input / output signals of the data system on the B channel or the D channel.
A digital telephone characterized in that, when transmitting a data system, the channel selecting means first captures from the B channel, and if the B channel is blocked, the D channel is selected for data communication. 2. When a data system receives a call, the channel selection means first captures from the B channel, and if the B channel is blocked, the D channel is selected, the selected channel is notified to the transmission system terminal, and data communication is performed. The digital telephone according to claim 1, wherein