KR100353648B1 - Up/down stream transmission method in a coustomer premise equipment of adsl transmission system - Google Patents

Abstract

Disclosed is a frame transmission method, which allows a user to use multiple telephones or computers through a single telephone line in a subscriber premises device of a transmission system using an asymmetric digital subscriber line (ADSL). According to the present invention, an ADSL system includes a switching terminal device and a subscriber premises device, wherein the subscriber premises device includes a telephone for voice call, a plurality of slaves comprising computers for data communication, and one telephone. It is connected to the slaves via a line and includes a master for transmitting and receiving control between the switching terminal and the slaves. When a master generates a down frame for transmission to a slave, the master first allocates channel information for slaves for voice communication and data communication of at least one of the slaves. Next, the master generates a down frame in which a bit representing the allocated channel information is attached to the head of the channel information and transmits it to corresponding slaves. When a slave generates an upframe for transmission to a master, first, each slave generates channel information for voice call or data communication. Next, each slave generates an upframe in which a bit representing the generated channel information is attached to the head of the channel information and transmits it to the master.

Description

Method of transmitting frame in subscriber indoor device of asymmetric digital subscriber line transmission system {UP / DOWN STREAM TRANSMISSION METHOD IN A COUSTOMER PREMISE EQUIPMENT OF ADSL TRANSMISSION SYSTEM}

The present invention relates to a transmission system using an asymmetric digital subscriber line (ADSL), and more particularly to a frame transmission method that allows the use of multiple phones or computers through a single telephone line in the subscriber premises device.

In addition to voice services, rapidly changing communication environments, such as subscriber demand for multimedia services such as high-speed data, video on demand (VOD), and video conferencing, have made service providers feel limited in their capacity. Accordingly, the broadband communication network using the optical cable was established. However, the construction of the optical cable to the subscriber's premises requires a huge investment of investment, and also requires a long time to provide the optical cable to all anticipated subscribers, so the realization is in a state of need. As an alternative, an asymmetric digital subscriber line (hereinafter referred to as "ADSL"), a high-speed subscriber acceptance technology using a conventional two-wire telephone network, has emerged.

At present, the use of copper cable, which is composed of subscribers' homes, generally uses only a fraction of its transmission capacity (3.4KHz in 1MHz). Therefore, it is enough to accommodate multimedia services when using the maximum transmission capacity, and the economical efficiency is high according to technology development. Thus, ADSL is a digital transmission line technology that enables high-speed data communication using copper wire. This ADSL was developed for VOD services in Bellcore, USA in the 1980s. Although the ADSL varies slightly depending on the transmission distance from the telephone company to the subscriber's premises, the type of telephone line, and the equipment used, the ADSL supports 1.5Mbps to 8Mbps downlink from the telephone company to the subscriber and 1Mbps at uplink 16Kbps. do. Since the ADSL has a high speed and asymmetrical transmission speed, interactive multimedia services such as movies, telephones, video catalogs, LAN access, VOD, and high-speed Internet access are available to all users such as subscribers and small businesses. Can be provided.

1 is a view showing a general configuration of a transmission system (hereinafter referred to as "ADSL system") that provides a multimedia service to subscribers using ADSL.

Referring to FIG. 1, the ADSL system includes an Exchange Terminal Unit 1 and a Customer Premises Equipment (CPE) or a Remote Terminal Unit 10. The switching terminal 1 is installed in the switching center, and the remote terminal 10 is installed in the subscriber's home. The exchange terminal device 1 includes a multiplexer 3 and a splitter 5. As shown in FIG. The multiplexer 3 is connected to a data network such as an internet or internet protocol network. The multiplexer 3 provides the data received from the data network to the distributor 5 and transmits the data from the distributor 5 to the data network. The distributor 5 is connected to a data network through the multiplexer 3, and also to voice networks such as a public switched telephone network (PSTN). In this case, the distributor 5 and the public telephone network are connected to each other through a general telephone line, and the multiplexer 3 and the data network are connected to each other through an optical cable. In addition, a plurality of remote terminal devices 10 are connected to the distributor 5. Therefore, the distributor 5 distributes the voice signals and data from the remote terminals 10 to the data network through the voice network and the multiplexer 3, respectively, and vice versa. The data from the distribution is transmitted to the corresponding remote terminal device 10, respectively.

The remote terminal 10 is connected to the switching terminal 1 through a general telephone line (eg, copper pair), to a splitter 11, a telephone 15, an ADSL modem 13, and a personal computer (PC) 17. It is composed. The distributor 11 inputs the voice signal or data from the switching terminal 1, distributes the voice signal to the telephone 15, and distributes the data to the computer 17 through the ADSL modem 13. The distributor 11 also transmits the voice signal from the telephone 15 and the data from the computer 17 via the ADSL modem 13 to the switching terminal 1. The ADSL modem 13 demodulates data from the switching terminal 1 to the computer 17 and modulates the data from the computer 17 to the switching terminal 1. The ADSL modem 13 may modulate and demodulate data according to a Discrete Multi-Tone (DMT) scheme. In this case, the data from the switching terminal 1 is data encoded according to a predetermined compression scheme (eg, a Motion Picture Experts Group (MPEG) scheme).

In FIG. 1, a typical example in which the remote terminal device 10 includes one phone 15 and one computer 17 is described. In other words, a typical ADSL system allows only one person to make voice calls or data communications. However, if two or more people can simultaneously perform voice calls or data communications using the ADSL system, they will be forced to say that they are more efficient. Of course, if a local area network (LAN) is separately installed in addition to installing an ADSL system as shown in FIG. 1 in a subscriber's home (home or office), two or more simultaneous voice calls or data communication may be possible. However, the separate installation of LAN is a big economic burden for subscribers. In this patent, Korean Patent Application No. 99-46856, filed on Oct. 27, 1999, by the applicant of the present application, discloses a technology for reducing the economic burden and allowing two or more people to simultaneously perform a voice call or data communication. A home network system in an asymmetric digital subscriber line system is disclosed in detail. The present invention relates to a specific data transmission flow between the master and the slave in such a home network system.

On the other hand, the following matters should be considered in implementing the home network system that allows a plurality of users to independently make calls or data communications even when using one telephone line.

Traditionally known as TCM (Time Compression Multiplexed), the so-called ping pong transmission can physically accommodate distances of up to 1000 m from # 24 cable using regular telephone lines, and alternate mark inversion (AMI) line coding. Use At this time, the transmission rate basically uses a symbol rate of 384kbps, and the transmission format supports 144kbps in both directions using a format of 2B + D as shown in FIGS. 2A and 2B. That is, as illustrated in FIGS. 2A and 2B, two B channels of 64 kbps and a D channel of 16 kbps are provided during transmission between the master and the slaves. In the case of the conventional TCM method, it was necessary to configure the point-to-point method between the master and the slaves, and had to transmit 144kbps of the 2B + D method, and it was difficult to use efficiently because the bandwidth was fixed. .

In implementing the home network system, problems that may be caused when the existing TCM method is used are summarized as follows.

1) In case of using the existing TCM method, it is necessary to reconstruct the line by the point-to-point method in order to use several telephones. For example, it is necessary to reconstruct a track in a point-to-point manner to use multiple phones, such as a key phone system or a private branch exchange (PBX).

2) The maximum possible transmission rate is limited to 144kbps because 2B + D frame format is used between master and slave.

3) The transmission / reception channel bandwidth between the master and slaves is fixed.

Accordingly, an object of the present invention is to reconfigure the line between the master and the slaves in a point-to-point manner when implementing a home network device that allows multiple subscribers to independently make calls or data communications through one telephone line in an ADSL system. To provide a way to avoid this.

Another object of the present invention is to provide a new transmission frame format between a master and a slave when implementing a home network device that allows multiple subscribers to independently make a call or data communication through one telephone line in an ADSL system.

It is still another object of the present invention to adaptively and dynamically allocate a transmission / reception channel bandwidth between a master and a slave when implementing a home network device that enables multiple subscribers to independently make a call or data communication through one telephone line in an ADSL system. To provide a way to do this.

It is still another object of the present invention to implement a home network device that allows multiple subscribers to independently make calls or data communications through a single telephone line in an ADSL system, and a method of dynamically adjusting a transmission speed between a master and slaves. In providing.

In order to achieve the above object, the present invention requires that the telephone lines installed in the subscriber's premises are configured in a bus manner so that the lines can be reconfigured in order to use multiple phones or computers. Channel multiplexing, and avoiding the fixed concept of using fixed channel bandwidth of transmission / reception of traditional TCM, adaptively and dynamically allocating transmission / reception channel bandwidth according to the amount of information to asymmetric transmission / reception channel bandwidth To maximize satisfaction.

According to the present invention, an ADSL system includes a switching terminal device and a subscriber premises device, wherein the subscriber premises device includes a telephone for voice call, a plurality of slaves comprising computers for data communication, and one telephone. It is connected to the slaves via a line and includes a master for transmitting and receiving control between the switching terminal and the slaves.

When a master generates a down frame for transmission to a slave, the master first allocates channel information for slaves for voice communication and data communication of at least one of the slaves. Next, the master generates a down frame in which a bit representing the allocated channel information is attached to the head of the channel information and transmits it to corresponding slaves. In this case, a bit indicating the start of the down frame is further attached to the first position of the down frame, and the channel information is changeable.

When a slave generates an upframe for transmission to a master, first, each slave generates channel information for voice call or data communication. Next, each slave generates an up frame in which a bit representing the generated channel information is attached to the head of the channel information, and transmits it to the master. In this case, an idle bit is further added to the initial position of the up frame to prevent synchronous disturbance and loss between slaves, and the channel information can be changed.

1 is a diagram illustrating a configuration of a transmission system using an asymmetric digital subscriber line (ADSL).

2A and 2B are diagrams illustrating a transmission format and an operation timing between a master and slaves in a home network system according to a conventional TCM scheme.

3 is a view showing the configuration of a home network system according to the present invention.

4 is a detailed configuration diagram of the master shown in FIG.

5 is a diagram illustrating a transmission frame format between a master and a slave shown in FIG. 3;

FIG. 6 is a diagram showing the operation timing of the master shown in FIG. 3; FIG.

FIG. 7 is a diagram illustrating an operation timing of a slave illustrated in FIG. 3.

8A-8D show examples of dynamic bandwidth allocation in accordance with the present invention.

9 is a process flow for detecting a ring from a master in the master according to the present invention to inform the slave.

10 is a process flow diagram for informing a master whether a handset is on / off in a slave according to the present invention.

11A and 11B are process flow diagrams for an inter-slave extension call in accordance with the present invention.

12 is a process flow diagram for an example of a dynamic bandwidth change in accordance with the present invention.

13 is a process flow diagram for another example of a dynamic bandwidth change in accordance with the present invention.

DETAILED DESCRIPTION A detailed description of preferred embodiments of the present invention will now be described with reference to the accompanying drawings. It should be noted that reference numerals and like elements among the drawings are denoted by the same reference numerals and symbols as much as possible even though they are shown in different drawings. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

First of all, the present invention provides a tactic in which subscribers such as one home (or a small office) can independently make calls through a plurality of telephones, and perform data communications independently through a plurality of computers. It is important to note that it is about a home network system. Therefore, the following briefly describes the configuration and operation of the above-described home network system, the detailed flow and algorithm of the transmission scheme between the master and the slave in the home network system directly related to the present invention, and the master and slave D-channel signaling between them will be described in detail.

Home network system to which the present invention is applied

3 is a diagram illustrating a configuration of a home network system to which the present invention is applied.

Referring to FIG. 3, one master 200 and six slaves 300 (310, 320, 330, 340, 350, and 360) are connected in a bus manner. As illustrated in FIG. 1, the master 200 is connected to a voice network or a data network through a multiservice access concentrator system (MACS) (not shown), which is a switching terminal device to which the present invention is applied. In addition, six slaves 310 to 360 are connected to the master 200. The slaves 300 may use a telephone or a computer. Here, the first and second slaves 310,320 are designated for the telephone, the third and fourth slaves 330,340 are designated for the extension telephone, and the fifth and sixth slaves 350,360 are used for the personal computer (PC). An example designated by is shown. A corresponding terminal is connected to the slaves 300 through an adapter.

4 is a diagram illustrating a specific configuration of the master 200 shown in FIG. 3.

Referring to FIG. 4, the controller 210 controls the overall operation of the home master 200. The controller 210 has preset channel information-information such as the number of channels to be used, bands, transmission speeds and sizes of the channels, and a unique number of an adapter (slave) corresponding to the channels.

The subscriber line interface unit 201 is included in the remote terminal device and interfaces signals transmitted and received between the switching terminal device and the remote terminal device shown in FIG. 1. The subscriber line interface unit 201 detects a voice signal carried on a Plain Old Telephone Service (POTS) channel from the received signal from the switching terminal device and outputs it to the codec 211, and outputs the signal of the remaining channel to the transmission modem 202. On the contrary, the subscriber line interface unit 201 receives a voice signal input from the codec 211 and a signal input from the transmission modem 201, and transmits the voice signal to a POTS channel to a switching terminal device.

The transmission modem 202 receives and decompresses and decompresses signals of remaining channels except for the POTS channel from the subscriber line interface unit 201. The signal of the voice channel among the separated channel signals is output to the call switch 204, and the signal of the data channel is output to the medium access control (MAC) processor. The transmission modem 202 may control the speed of up-stream and down stream, the number and size of channels. If the transmission modem 202 adjusts the speed and the number and size of the channels, the switching terminal should also adjust the data transmission speed and the number and size of the subscriber's premises having the transmission modem 202.

The codec 211 performs two roles of a subscriber circuit matching function and a pulse coded modulation (PCM) coding function. When performing the former function, the codec 211 notifies the controller 210 of the fact that such a detection result is detected when a ring signal through the POTS channel from the subscriber line interface unit 201 is detected. In the latter function, the codec 211 detects a voice signal through the POTS channel, converts the voice signal into voice data, and outputs the voice signal to the call switch 204. The power switch 203 is automatically switched in the event of a power failure so that it can be used like a conventional telephone by being directly connected to the telephone. The power switch 203 may be implemented as a relay.

The call switch 204 performs a switching operation of voice data by a time switch or a space switch method. Specifically, the call switch 204 receives voice data input from the codec 211 and the transmission modem 202 through a corresponding channel divided by time division, and is controlled by the controller 210 and loaded on the corresponding channel to the frame synthesizer / divider 207. Output In addition, the call switch 204 exchanges voice or data between terminals during an extension call. Signaler 206 generates all the tones (dialtones, calltones, etc.) and ringtone data required for DTMF reception and call, number PCM data. When a ring signal indicating that the call is received through the POTS channel is transmitted from the subscriber line interface unit 201 to the codec 211, the codec 211 detects the ring signal and informs the controller 210 that the ring is detected. The controller 210 notified that the ring is detected instructs the call switch 204 to make a call and informs the corresponding subscriber that the call has been received.

The master clock generator 205 generates a master clock. The MAC processor 212 outputs the received channels to the frame synthesizer / divider 207 when receiving the data channel from the transmission modem 202 and performs a server function in the subscriber's home. The MAC processor 212 has an external IP address for performing data communication with the outside, an internal IP address for performing a server function in the subscriber's home, and data between the computers in the subscriber's home by the internal IP address. Allow communication to take place.

The frame synthesizer / divider 207 receives voice channels and data channels from the call switch 204 and the MAC processor 212, generates a frame according to the present invention to be described below, outputs it to the drive / receiver 208, and is input from the drive / receiver 208. The frame is divided into a voice channel and a data channel and output to the call switch 204 and the MAC processor 212, respectively. The driver / receiver 208 is a component that drives a bus in the subscriber's home. The driver / receiver 208 transmits a frame generated by the frame synthesizer / divider 207 to a corresponding slave through a corresponding adapter, and vice versa. Receive frames through The power supply module 209 receives a commercial power supply of 220V and generates and supplies a feeding voltage of -24V and other necessary DC voltages.

It should be noted that the configuration and operation of the home network system as outlined above are disclosed in detail in Korean Patent Application No. 99-46856 as described above.

The present invention is closely related to the frame synthesizer / distributor 207, driver / receiver 208 and controller 210 in the master 200 among the components of such a home network system. The present invention is to develop a detailed flow and algorithm for the transmission method between the master and the slave and to design the D-channel signaling between the master and the slave. The present invention frees up the fixed format of 2B + D, which is the existing frame format, and freely reallocates the bandwidths of each other under the control of the D channel without sticking to the bandwidth of transmission and reception. In other words, when initializing, the bandwidth is allocated and operated according to the environment connected between the master and the slave, and the master detects the change in the number of slaves connected to the master and reallocates the bandwidth using the D channel to use the efficient bandwidth. To help. According to the present invention, in order to enable data communication with a plurality of telephones by operating the point-to-point method by a bus, a new frame format other than the 2B + D method that can operate in a bus form without a new wiring work is constructed. can do. In addition, the transmission speed can be configured to be up to 1152kbps (128kbpps ~ 1152kbps), and the transmission speed can be dynamically adjusted.

Burst Data Transfer

According to the present invention, a single master 200 and slaves 300 are configured as shown in FIG. 3 to transmit data between a master and a slave by using a general telephone line, and the first slave 310 to the fourth slave 340 are connected to the telephone. An example in which the fifth slave 350 and the sixth slave 360 are used for a computer will be described. The interface line used here is a regular telephone line and is composed of a bus.

FIG. 5 is a diagram illustrating a transmission frame format between a master and a slave shown in FIG. 3.

Referring to FIG. 5, a down frame, which is a transmission frame from a master to a slave, includes four bits of start bits indicating start, four bits of D-channel bits for controlling each channel, It consists of four audio channels CH0 to CH3 composed of eight bits, and two data channels CH4 and CH5 composed of 128 bits.

An up frame, which is a transmission frame from a slave to a master, is configured asymmetrically differently from the downstream. The up frame includes a 2-bit idle bit in front of each channel to prevent synchronization and loss of synchronization between the slave and the slave, and 4-bit D-channel bit for each channel for controlling each channel; It consists of four audio channels CH0 to CH3 composed of eight bits, and two data channels CH4 and CH5 composed of 32 bits.

The down frame and the up frame of the above structure are combined into two frames within a preset time (250 ms). The voice channel CH0 is a channel for the terminal 1 (slave 1), the voice channel CH1 is a channel for the terminal 2 (slave 2), the voice channel CH3 is a channel for the terminal 3 (slave 3), and the voice channel CH4 is A channel for terminal 4 (slave 4), a data channel CH4 is a channel for terminal 5 (slave 5), and a data channel CH5 is a channel for terminal 6 (slave 6). An example of setting 4-bit D-channel bits for controlling the respective channels is shown in Table 1 below.

As described above, in the present invention, the ADSL system includes a switching terminal device and a subscriber premises device, wherein the subscriber premises device includes a plurality of slaves including telephones for a voice call and computers for data communication. And a master connected to the slaves through one telephone line and controlling transmission and reception between the switching terminal device and the slaves. In this case, a transmission frame between the master and the slaves is generated and transmitted as follows.

The process of generating a down frame for the master to transmit to the slave is as follows.

First, the master allocates channel information for slaves for at least one voice call and data communication among the slaves. Next, the master generates a down frame in which a bit representing the allocated channel information is attached to the head of the channel information and transmits it to corresponding slaves. In this case, a bit indicating the start of the down frame is further attached to the first position of the down frame, and the channel information is changeable.

A process of generating an upframe for the slave to transmit to the master is as follows.

First, each slave generates channel information for voice call or data communication. Next, each slave generates an upframe in which a bit representing the generated channel information is attached to the head of the channel information and transmits it to the master. In this case, an idle bit is further added to the initial position of the up frame to prevent synchronous disturbance and loss between slaves, and the channel information can be changed.

FIG. 6 is a diagram illustrating an operation timing of the master 200 shown in FIG. 3.

Referring to FIG. 6, 2.048 MHz may be used as the main clock, and a D-channel clock CTL_CLOCK (eg, 16 kHz) is generated in synchronization with the main clock, and the D-channel clock is a D-channel. Used for control. D synchronization signal CTL_SYNC is generated in synchronization with the D channel clock. In synchronization with the D synchronization signal, D-channel 4 bits CTL_DATA are carried in a frame. The transmission synchronization signal TX_SYNC is a signal synchronized with the main clock, and the transmission enable signal TXD_E is generated in synchronization with the transmission synchronization signal. In response to the transmission enable signal, burst data TXD is carried on a transport channel. This transmission data TXD is transmitted to the corresponding slave. Each slave may receive its own data RXD by receiving transmission data according to a synchronization signal RX_SYNC. At this time, the receiver of the master 200 does not operate.

FIG. 7 is a diagram illustrating an operation timing of the slaves 300 illustrated in FIG. 3.

Referring to FIG. 7, each of the slaves 310 to 360 is synchronized with a start bit sent from the master 200. Next, as shown in FIG. 5, each of the slaves 310 to 360 receives a D-channel 4 bits after a delay by a time delay (td: time delay) time, and receives burst data from a channel assigned thereto. Slave 1 receives data on channel 0, slave 2 receives data on channel 1, slave 3 receives data on channel 2, slave 4 receives data on channel 3, and slave 5 on channel 4 Receive data, and slave 6 receives data on channel 5.

Each slave 310 to 360 waits for a guide time (tg: time guard) time as shown in FIG. 5 after receiving the burst data on its assigned channel, and then enters the idle bit 2 to prevent synchronization and data loss between the slaves. Transmits the bits and transmits the burst data to the master 200. At this time, similar to receiving the burst data sent from the master 200 in the channel allocated to each slave, each slave 310 to 360 transmits the burst data only in the channel assigned to the master 200. At this time, the receivers of the slaves 310 to 360 do not operate. The master 200 receives burst data from each of the slaves 310 to 360 and synthesizes the received data by the frame synthesizer 207 to generate a transmission frame.

Dynamic bandwidth allocation

8A-8D illustrate examples of dynamic bandwidth allocation in accordance with the present invention.

Examples of such bandwidth allocation may be configured using D-channel signaling to determine initial bandwidth between master 200 and slave 300. The allocation of the dynamic bandwidth can be changed using the D-channel as shown in Table 1 below. Herein, the D-channel means D-channel 4 bits shown in FIG. 5.

BIT DOWN STREAM UP STREAM 0000 When ringing all slaves (ON) HOOK ON 0001 (OFF) HOOK OFF 0010 0011 0100 When ringing extension 1 0101 When ringing extension 2 0110 When ringing extension 3 0111 When ringing extension 4 1000 Set Bandwidth Change (Initial) Check for bandwidth changes (initial) 1001 Change-1 setting Confirm Change-1 1010 Change-2 settings Change-2 OK 1011 Change-3 settings Change-3 OK 1100 1101 1110 1111

8A illustrates an example of bandwidth allocation between a master and a slave according to the present invention. This example corresponds to the case where the value of the 4-bit D channel of Table 1 is " 1000 ", which enables the use of four telephones for communication and two computers for data communication.

Referring to FIG. 8A, the upstream is composed of four voice channels, each allocated with a 64 kbps bandwidth, and two data channels, each allocated with a 512 kbps bandwidth. Therefore, the upstream voice channel is allocated with a bandwidth of 256 kbps and the data channel is allocated with a bandwidth of 1024 kbps. The downstream consists of four voice channels, each allocated with a 64 kbps bandwidth, and two data channels, each allocated with a 128 kbps bandwidth. Therefore, the downstream voice channel is allocated with a bandwidth of 256 kbps, and the data channel is allocated with a bandwidth of 256 kbps. Table 2 below summarizes the bandwidth allocation for each channel according to the example shown in FIG. 8A.

division VOICE CH. DATA CH. UP STREAM (64 kbps * 4) = 256 kbps (512kbps * 2) = 1024kpbs DOWN STREAM (64 kbps * 4) = 256 kbps (128kbps * 2) = 256 kbps

8B illustrates another example of bandwidth allocation between a master and a slave according to the present invention. This example corresponds to the case where the value of the 4-bit D channel of Table 1 is " 1001 ", which enables the use of four telephone phones and one computer for data communication.

Referring to FIG. 8B, the upstream is composed of four voice channels each allocated with a 64 kbps bandwidth and one data channel allocated with a 1024 kbps bandwidth. Therefore, the upstream voice channel is allocated with a bandwidth of 256 kbps and the data channel is allocated with a bandwidth of 1024 kbps. The downstream consists of four voice channels, each allocated with 64 kbps bandwidth, and one data channel allocated with 256 kbps bandwidth. Therefore, the downstream voice channel is allocated with a bandwidth of 256 kbps, and the data channel is allocated with a bandwidth of 256 kbps. Table 3 below summarizes the bandwidth allocation for each channel according to the example as shown in FIG. 8B.

division VOICE CH. DATA CH. UP STREAM (64 kbps * 4) = 256 kbps (1024kbps * 1) = 1024kpbs DOWN STREAM (64 kbps * 4) = 256 kbps (256kbps * 1) = 256kbps

8C illustrates another example of bandwidth allocation between a master and a slave according to the present invention. This example corresponds to the case where the value of the 4-bit D channel of Table 1 is " 1010 ", thereby enabling the use of two telephone phones and one computer for data communication.

Referring to FIG. 8C, the upstream is composed of two voice channels each allocated with a 64 kbps bandwidth and one data channel allocated with a 1152 kbps bandwidth. Thus, the upstream voice channel is allocated with a bandwidth of 128 kbps and the data channel is allocated with a bandwidth of 1152 kbps. The downstream consists of two voice channels, each allocated with a 64 kbps bandwidth, and one data channel allocated with a 384 kbps bandwidth. Therefore, the downstream voice channel is allocated with a bandwidth of 128 kbps and the data channel is allocated with a bandwidth of 384 kbps. Table 4 below summarizes bandwidth allocation for each channel according to the example shown in FIG. 8C.

division VOICE CH. DATA CH. UP STREAM (64 kbps * 2) = 128 kbps (1152 kbps * 1) = 1152 kbps DOWN STREAM (64 kbps * 2) = 128 kbps (384 kbps * 1) = 384 kbps

8d illustrates another example of bandwidth allocation between a master and a slave according to the present invention. This example corresponds to the case where the value of the 4-bit D channel of Table 1 is " 1011 ", which enables the use of two telephones for communication and two computers for data communication.

Referring to FIG. 8D, the upstream is composed of two voice channels each allocated with a 64 kbps bandwidth and two data channels each allocated with a 576 kbps bandwidth. Thus, the upstream voice channel is allocated with a bandwidth of 128 kbps and the data channel is allocated with a bandwidth of 1152 kbps. The downstream consists of two voice channels, each allocated with a 64 kbps bandwidth, and two data channels, each allocated with a 192 kbps bandwidth. Therefore, the downstream voice channel is allocated with a bandwidth of 128 kbps and the data channel is allocated with a bandwidth of 384 kbps. Table 5 below summarizes the bandwidth allocation for each channel according to the example shown in FIG. 8D.

division VOICE CH. DATA CH. UP STREAM (64 kbps * 2) = 128 kbps (576 kbps * 2) = 1152 kbps DOWN STREAM (64 kbps * 2) = 128 kbps (192 kbps * 2) = 384 kbps

D-channel protocol algorithm

As described above, the present invention uses the D-channel for signaling between the master 200 and the slave 300, and operates according to the D-channel value. The operation according to the D-channel value is determined as a bit allocated to the D-channel shown in Table 1, and the operation in each case according to the determined bit value will be described with reference to FIGS. 9 to 13 to be described later. .

FIG. 9 is a diagram illustrating a processing flow of notifying a slave 300 by detecting a ringing ring in a master 200 according to the present invention.

Referring to FIG. 9, in step 901, the master 200 determines whether a ring comes from the telephone station. If it is determined that the ring is turned on at the telephone station, in step 902, the master 200 sets the D-CH bit value to "0001", loads ringtone data on each channel CH1 to 4, and slaves the down frame including the ringtone data. Transfer to 300. In contrast, if it is determined that the ring does not come from the telephone station, in step 903, the master 200 sets the D-CH bit value to "0000" (default), and transmits the down frame in which the default value is set to the slave 300.

The slave 300 determines whether the D-CH bit value included in the transmission frame from the master 200 is “0001” in operation 911. If the D-CH bit value is "0001", the slave 300 connects an internal path to a ring path in operation 912 and operates a buzzer in operation 913. In contrast, when the D-CH bit value is not "0001", the slave 300 connects the internal path as a voice path (default path) in step 914.

FIG. 10 is a diagram illustrating a processing flow of notifying a master 200 whether a handset is turned on / off in a slave 300 according to the present invention.

Referring to FIG. 10, the slave 300 determines whether a telephone is heard in step 1001. The slave 300 sets the D-CH bit value to "0001" in step 1002 when the telephone is heard, and sets the D-CH bit value to "0000" (default) in step 1003 when the telephone is not heard. The upframe including the set value is transmitted to the master 200. In step 1011, the master 200 determines whether the D-CH bit value included in the transmission frame from the slave 300 is "0001". When it is determined that the D-CH bit value is "0001", the master 200 loads the dial tone data on each channel CH1 to 4 in step 1012 and transmits the down frame including the dial tone data to the slave 300. The slave 300 connects a voice path in response to the transmission frame from the master 200.

11A and 11B illustrate a processing flow for extension calls between slaves according to the present invention.

Referring to FIG. 11A, in operation 1101, the slave 300 determines whether the telephone is picked up for an extension call. If it is determined that the slave 300 has heard the telephone, the slave 300 sets the D-CH bit value to "0001" in step 1102. If it is determined that it is not, the slave 300 sets the D-CH bit value to "0000" (the default value). ), And transmits an up frame including the set D-CH bit value to the master 200.

The master 200 determines in step 1111 whether the D-CH bit value included in the transmission frame from the slave 300 is "0001". If it is determined, the master 200 loads the dial tone data on each channel CH1 to 4 in step 1112 and transmits the down frame including the dial tone data to the slave 300.

The slave 300 checks outgoing data included in the transmission frame from the master 200 in step 1121 and connects the internal path to the voice path. At this time, any one of the slave 300 will press any extension number of "#" and extension number (1 to 4) for the extension call. In operation 1122, the slave 300 transmits an up frame including data about the "#" and the extension number pressed by the subscriber, to the master 200.

Referring to FIG. 11B, in operation 1131, the master 200 analyzes data for an extension call included in a transmission frame from the slave 300. At this time, the master 200 sets the D-CH bit value according to each data to be analyzed, that is, the extension number. For example, if it is determined in step 1132 that the extension number is 1, the master 200 sets the D-CH bit value to “0100” in step 1133. If it is determined in step 1134 that the extension number is 2, the master 200 sets the D-CH bit value to “0101” in step 1135. If it is determined in step 1136 that the extension number is 3, the master 200 sets the D-CH bit value to "0110" in step 1137. If it is determined in step 1138 that the extension number is 4, the master 200 sets the D-CH bit value to "0111" in step 1139. As such, the down frame including the D-CH bit value set in any one of steps 1133, 1135, 1137, and 1139 may be transmitted to the slave 300.

The slave 300 determines whether a frame including the D-CH bit value set for the extension call is transmitted from the master 200 in step 1141. If it is determined, the corresponding slave connects the internal path to the ring path in step 1142 and operates the buzzer in step 1143. However, if it is determined that a frame including the D-CH bit value set for the extension call is not received, the slave 300 connects the internal path to the default voice path.

12 is a diagram illustrating a processing flow for an example of dynamic bandwidth change according to the present invention.

Referring to FIG. 12, the master 200 initially sets the D-CH bit value for the bandwidth setting to “1000” (the default value) in step 1201 and includes a D-CH bit value for the bandwidth setting. Create a frame and send it to the slave 300.

In operation 1211, the slave 300 determines whether the D-CH bit value for bandwidth setting included in the transmitted frame is “1000”. If it is determined, the slave 300 sets the D-CH bit value for the bandwidth setting to 1000 in step 1212. In step 1213, the slave 300 allocates six channels, that is, four phones for basic voice call and two computers for data communication. The upframe including the allocated channel information is transmitted to the master 200.

In step 1221, the master 200 determines whether the D-CH bit value for bandwidth setting previously transmitted in step 1201 and the D-CH bit value for bandwidth setting included in the upframe transmitted in step 1213 are the same. . If it is determined to be the same, in step 1222, the master 200 allocates bandwidth to six channels, that is, four basic voice call phones and two data communication computers, and transmits the down frame including the allocated channel information to the slave 300. .

13 is a diagram illustrating a processing flow for another example of dynamic bandwidth change according to the present invention.

Referring to FIG. 13, assuming that the master 200 changes the D-CH bit value for bandwidth setting to “1001” in operation 1301, the down frame including the D-CH bit value for the changed bandwidth setting is slaved. Is sent to 300.

The slave 300 determines in step 1311, 1313, 1315, or 1317 whether the D-CH bit value for changing the bandwidth setting included in the frame transmitted from the master 200 is determined. In step 1312, 1314, 1316, and 1318, the corresponding channel is checked according to the result, and in step 1319, the upframe including the allocated channel information is transmitted to the master 200.

In step 1321, the master 200 determines whether the D-CH bit value for changing the bandwidth setting previously transmitted in step 1301 and the D-CH bit value for changing the bandwidth setting included in the upframe transmitted in step 1319 are the same. To judge. If it is determined to be the same, in step 1322, the master 200 allocates bandwidth to five channels, four basic voice call phones and one data communication computer, and transmits the down frame including the allocated channel information to the slave 300. .

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, the present invention implements a home network device that enables multiple subscribers to independently make calls or data communications through one telephone line in an ADSL system. The master detects that the number of slaves connected to the master is changed and allocates bandwidth by using the D channel bits, thereby enabling efficient bandwidth use.

Claims (6)

An asymmetric subscriber digital line (ADSL) transmission system comprising a switching terminal device and a subscriber premises device, the subscriber premises device comprising: a plurality of slaves comprising telephones for a voice call and computers for data communication; In the method for transmitting and receiving a frame between the master and the slave and connected to the slave via a telephone line, including a master for transmitting and receiving control between the switching terminal and the slave, Assigning, by the master, channel information for slaves for at least one voice call and data communication among the slaves; And generating a down frame in which a bit representing the allocated channel information is attached to a head of the channel information and transmitting the generated down frame to corresponding slaves. The method of claim 1, wherein the first position of the down frame is further appended with a bit indicating the start of the down frame. The method as claimed in claim 1, wherein the channel information is changeable. An asymmetric subscriber digital line (ADSL) transmission system comprising a switching terminal device and a subscriber premises device, the subscriber premises device comprising: a plurality of slaves comprising telephones for a voice call and computers for data communication; In the method for transmitting and receiving a frame between the master and the slave and connected to the slave via a telephone line, including a master for transmitting and receiving control between the switching terminal and the slave, Generating channel information for each voice call or data communication by each slave; And generating an upframe in which a bit representing the generated channel information is attached to a head of the channel information and transmitting the generated upframe to the master. 5. The method as claimed in claim 4, wherein an idle bit is further attached to the initial position of the up frame to prevent synchronous disturbance and loss between slaves. The method as claimed in claim 4, wherein the channel information is changeable.