KR20010047941A - Telephone equipped with data communication function - Google Patents

Abstract

PURPOSE: A digital key phone with the data communication function is provided to enable the data communication connected to the digital key phone with Ethernet function when the data terminal equipment is not connected to a communication network. CONSTITUTION: In a digital key phone connected to the external network through the key phone system, a voice-data transceiving part(11) determines if the communication is the voice communication or the data communication and transceives the voice and the data. A voice communication control part(12) controls the voice communication if the voice-data transceiving part determines the communication is the voice communication. A data communication control part(16) controls the data communication if the voice-data transceiving part determines that the communication is the data communication.

Description

Telephone equipped with data communication function

The present invention is connected to a digital key phone having an Ethernet function even when the terminal is not connected to a communication network (eg, LAN, ISDN, etc.) when performing data communication with a data terminal equipment (DTE). A digital key phone telephone having an Ethernet function for enabling data communication.

Ethernet is a local area network (LAN) technology capable of transmitting information between information terminals, and its protocol is specified in IEEE 802.3.

The configuration of an Ethernet system consists of three basic components: firstly, the physical medium used to transmit signals between DTEs, and secondly, fair arbitrates access to multiple DTE's access to shared channels. to the shared channel) An Ethernet frame consisting of a Medium Access Control (MAC) rule that controls the overall aspects of Ethernet transmission and reception, and third, a standardized set of bits used to transmit data. Consists of.

Many DTEs are connected to a medium (channel), a shared signaling system, which is usually in the form of a bus. Ethernet signals are transmitted in a serial manner between a plurality of DTEs through the channel.

In order for a specific DTE to transmit data to another DTE, the specific DTE must first listen to the channel state (listen to the channel). When the channel is in an idle state, a particular DTE starts transmitting data in the form of an Ethernet frame.

After the transmission of a frame, the opportunity for all DTEs to transmit the next frame should be equal. This equivalency means that the fairness of each DTE's network access and that no single DTE can prevent other DTE's network access.

Access to shared channels is achieved through the 'Medium Access Control (MAC)' mechanism built into each DTE's Ethernet interface, and the MAC mechanism is based on the 'Carrier Sense Multiple Access with Collision Detection' (CSMA / CD) protocol. Based.

In general, communication through a digital key phone is performed using two B-channels and one D-channel connecting the telephone to the key-phone system.

Voice and data communication is performed at 64 Kbps through two B channels, respectively, and control signals necessary for the voice and data communication are transmitted at 16 Kbps at D channel.

However, in practice, the use of digital key phones is limited to voice communication, so only one of the two B channels is mainly used, and the function of the digital key phone system is because the other channel is idle. There is an inefficiency that is not fully utilized.

In addition, data communication is mainly performed through a PC, which may cause a problem of cost burden for building equipment (eg, a router, a hub, etc.) for connecting to a communication network.

Therefore, the present invention was devised to solve such an inefficiency point, and an object of the present invention is to add an Ethernet function to a digital key phone and to connect an information terminal to the communication network instead of a key phone in an idle state. The present invention provides a digital key phone with an Ethernet function to enable data communication through the remaining B channels.

1 is a structure of an Ethernet frame.

2 is a configuration of a key phone telephone and a key phone telephone of the present invention connected to an external communication network (external network).

Digital key phone telephone of the present invention to accomplish the above object

The voice-data transmitting / receiving unit which distinguishes whether the communication by the digital key phone is voice communication or data communication, and is responsible for transmitting / receiving voice and data, and the voice-data transmitting / receiving unit determine that the communication is voice communication. The controlling voice communication control unit and the voice-data transmitting / receiving unit determine that the communication is data communication.

The operation of the present invention will be described with reference to the accompanying drawings.

1 is a structure of an Ethernet frame.

Brief description of each component.

1.Preamble-7 bytes

Preamble signals the start of an Ethernet / IEEE 802.3 frame, with alternating 1's and 0's.

2.SOF (Start Of Frame)-1 bytes

For synchronization of frames.

3.Destination Address, Source Address-6 bytes

This is the address of the device that sent the Ethernet / IEEE 802.3 frame and the device to receive. The source address is always a unicast (single node) address, while the destination address can be a unicast, multicast, or broadcast address.

4.Type-2 bytes

Identifies which protocol (ip, ipx, etc.) the packet in the data area of the Ethernet frame is.

5.Length-2 bytes

In the case of IEEE 802.3, these two bytes indicate the size of the subsequent IEEE 802.3 header and data in bytes.

6. Data

After processing at the physical layer and link layer for Ethernet frames, the part corresponding to this data is passed to the upper layer. In case of Ethernet, the upper protocol is identified by the type field. In the case of IEEE 802.3, this area is composed of a 64 byte header and a data area. The 802.3 header contains information on the upper protocol.

7.Frame Check Sequence (FCS)

This value is used to detect errors during the transmission of the Ethernet frame. This value is calculated using the cyclic redundancy check (CRC) method and put in the transmitting side, and the receiving side checks whether the Ethernet frame is broken.

Fig. 2 briefly shows the key phone telephone configuration and the configuration in which the key telephone telephone is connected to an external communication network (external network).

The digital key phone 10 and the key phone system 20 are connected via the voice-data transmission / reception unit 11 and perform voice and data communication through two B channels and one D channel.

A specific method of performing communication is performed by referring to commands and control signals entering or leaving the D channel. When the D channel signal indicates voice communication, voice communication is performed, and when data communication indicates data communication, Ethernet communication is performed.

The voice communication control unit 12 is responsible for performing voice communication, and when transmitting, the analog voice signal input from the sender is converted into packetized digital data. The digital packet is transmitted to the key phone system 20 through the voice-data transmission / reception unit 11 and then connected to the receiver through the external communication network 30. The reception proceeds as a reverse process of the transmission. After packetizing the packetized digital data from the external communication network 30, the packet is depacketized and then restored to an analog signal.

The data communication control unit 13 is responsible for performing data communication. At the time of transmission, data transmitted through a network interface card (NIC) in the DTE 40 is converted into an Ethernet frame form by the Ethernet converter 14. After being controlled by the MAC controller 16, it is transmitted to the key phone system 20 through the Ethernet transceiver 15 and the voice-data transceiver 11, and then connected to another DTE 50 via an external communication network 30. . As in the case of voice communication, the reception proceeds as a reverse process of the transmission. After depacketizing the data of the Ethernet frame structure from the external communication network 30, the data is converted into data suitable for each application program of the DTE 40. Communication takes place through the conversion process.

In conclusion, the digital key phone has a voice-data transmitting / receiving unit to distinguish the modes of communication (voice communication and data communication) and then perform communication corresponding to each mode.

The present invention can further increase the usability of the digital key phone by adding an Ethernet function to the digital key phone, thereby enabling data communication as well as existing voice communication. In particular, small groups (e.g., small businesses, SOHO offices, etc.) can establish data communications by installing only Ethernet-enabled telephones without establishing a separate network (e.g., LAN) for data communications. Unlike this, the cost of installing communication equipment can be significantly reduced.

Claims (5)

A digital key phone telephone connected to a key phone system and connected to an external communication network by the key phone system: A voice-data transmitting / receiving unit which distinguishes whether communication by the digital key phone is voice communication or data communication and is responsible for transmitting and receiving voice and data; A voice communication control unit for controlling the voice communication when the voice-data transmitting / receiving unit determines that the communication is voice communication; And And a data communication control unit for controlling the data communication when the voice-data transmitting / receiving unit determines that the communication is data communication. The digital key phone having a voice communication and data communication function according to claim 1, wherein the data communication control unit is operated by an Ethernet method (IEEE 802.3). 2. The voice communication and data of claim 1, wherein the distinguishing whether the communication by the telephone is a voice communication or a data communication is distinguished by a command and a control signal of a connection channel between the telephone and the key phone system. Digital key phone telephone with communication function. 4. A digital key phone having a voice communication and data communication function according to claim 3, wherein the connection channel is composed of two B channels and one D channel defined in the ISDN protocol. 5. The digital key phone according to claim 3 or 4, wherein the command and control signals are transmitted through the D channel.