KR100258552B1 - The interface board for providing wide band service to cable network in multi-functional group subscriber device - Google Patents

Abstract

PURPOSE: An interface board for providing broadband service to a cable network from a multifunctional collective subscriber unit, as capable of interfacing with set-top boxes, old analog telephones, facsimiles, modems, etc., is provided to offer service to many subscribers, regardless of network environment. CONSTITUTION: An RF part is composed of a telephony/CATV splitter(8), a transmit-receive splitter(9), a transmitting part(10), a receiving part(11), a local oscillator(12) and a baseband splitter/combiner(13). The telephony/CATV splitter(8) splits broadcasting and voice band services transmitted from a head end. The split broadcasting service is transmitted to cable broadcasting subscribers, and the split voice band service to the transmit-receive splitter(9). The transmit-receive splitter(9) provides a transmitting/receiving separated communication path between the head end and an associated subscriber. The transmitting part(10) consists of a power amplifier, an up-converter, and a gain control unit. The receiving part(11) consists of a low noise amplifier, a band pass filter, a down-converter and a gain control unit. The local oscillator(12), connected to the up-converter of the transmitting part(10) and the down-converter of the receiving part(11), is a frequency generator for the up-conversion of the transmitting part(10) and the down-conversion of the receiving part(11). The baseband splitter/combiner(13) converts signals having each different frequency band into baseband signals and transmits the converted signals to corresponding modems. The baseband splitter/combiner(13) splits a plurality of baseband signals transmitted from various modems into different frequency bands and transmits them to the transmitting part(10).

Description

Matching Board for Broadband Service as Cable Network in Multi-Function Group Subscriber Device

The present invention performs a function of transmitting a voice and voice band data service provided through a cable network in a multi-functional group subscriber device to an existing subscriber device such as an existing analog telephone, a fax, a modem, and a modem having a structure of a multiple modem. The present invention relates to a matching board comprising an RF unit capable of simultaneously processing transmission and reception signals generated from a plurality of modems.

In general, voice and voice band data services are provided to users through existing subscriber devices interfaced to wireline telephone networks. In recent years, there is an environment that can provide services to subscribers through existing wired telephone networks, cable networks, or wireless networks such as WLL and B-WLL. Therefore, there is a need for a multifunctional group type subscriber device capable of providing a service regardless of a network environment through a subscriber device using an existing wired network. In addition, a technology that can provide multiple lines from one modem unit by providing multiple modems to provide services to multiple subscribers in a multi-functional group subscriber device, and process the transmission and reception signals generated from such multiple modems with the same RF unit. This necessitates the need for proper call setup and processing in multiple modem configurations.

Therefore, the present invention is capable of interfacing with indoor subscriber devices such as existing analog telephones, fax machines, modems, etc., and can provide services to multiple subscribers regardless of the network environment of WLL, B-WLL, and cable. In this paper, we propose an implementation method for the RF part and the modem part for providing voice band service to the cable network and an algorithm for call setup and processing in such a configuration.

1 is a block diagram of a multi-functional collective subscriber device capable of providing a voice band service to a plurality of subscriber devices interfaced with a general wireline telephone network through a WLL, a B-WLL, and a cable network.

2 is a block diagram of a self including an RF unit and a modem unit for providing a voice band service to the cable network environment in the multifunctional group subscriber apparatus of FIG.

FIG. 3 is a flowchart illustrating call setup and processing for receiving voice service using a cable network when a subscriber connected to a multi-functional group subscriber device composed of self in FIG. 2 is a called subscriber and a general subscriber is a calling subscriber. .

FIG. 4 is a flowchart illustrating call setup and processing for receiving voice and voice band data service when the subscriber connected to the self-contained multifunctional group subscriber device of FIG. 2 is the calling party.

* Explanation of symbols for main parts of the drawings

1: RF unit 2: modem unit

3: switch unit 4: subscriber interface unit

5: Self power unit 6: Self control unit

7: whole control unit 8: cable service splitter

9 transmitter and receiver splitter 10 transmitter

11: receiver 12: local oscillator

13 Baseband Offset and Synthesizer 14 D / A and A / D Converters

15: baseband processor 16: modem control unit

17: Codec part 18: SLIC part

19: ring generation and control unit

In order to solve the above problems, the present invention provides a cable service splitter that separates cable broadcasting and voice band services transmitted on the same coaxial cable and transmits them to each processing unit, and transmission and reception between the headend and the multifunctional group subscriber device is performed. Transmitter / receiver splitter that provides separate communication path, baseband splitter and synthesizer are separated by frequency for each modem from baseband, and then converted into RF signals of the same frequency band, and then transmit and receive by increasing transmit power. A transmitter for transmitting to the splitter, a receiver for separating RF signals from the transceiver splitter into different frequencies before and after the baseband for each modem, and transmitting the signals to the baseband splitter and synthesizer; Local oscillator for generating frequency and different frequency bands received from receiver RF part composed of baseband branching and synthesizer which converts signals into basebands and transmits them to each modem, and divides a plurality of baseband signals received from the modem part into frequency bands before and after the baseband and transmits them to the transmitter; D / A and A / D which converts the baseband digital signal into an analog signal and transmits it to the baseband branch and synthesizer, and converts the analog signal from the baseband branch and synthesizer into a digital signal and sends it to the baseband processor. A modem consisting of a converter, a baseband processor for digital signal processing such as signal modulation and demodulation, spread spectrum and despreading, interleaving and deinterleaving, channel coding and decoding, and power control, and each modem constituting the modem section. It takes the performance and line usage status and transmits it to the self control unit, and transmits the information on the configuration of the modem unit to the baseband of the RF unit. It consists of a modem unit consisting of a modem control unit for transmitting to the offset and synthesizer.

EXAMPLE

Hereinafter, the configuration and embodiment of the present invention will be described in detail with reference to the drawings.

The multi-function collective subscriber device in which the board of the present invention is used has a structure as shown in FIG. 1 and includes an RF unit 1, a modem unit 2, a switch unit 3, a subscriber interface unit 4, and a self-control unit 5. , The self power supply unit 6 and the entire control unit 7. The RF unit and the modem unit are implemented differently according to the WLL, B-WLL, and cable environment. The module can be detached and used according to the service providing network. Other modules are commonly used regardless of the network.

Multi-functional collective subscriber device is a device that can be used as a collective by implementing the aggregation function by the use of the switch unit, it can be installed in the interior or basement floor MDF front of new apartments and large building rooftop.

The present invention proposes a method of implementing an RF unit and a modem unit for providing a service to a cable network in the above-mentioned multifunctional group subscriber device, thereby enabling voice and voice band data service to a subscriber device interfaced with an existing wired telephone network. Let's do it. In addition, it is not necessary to configure a separate modem in the house by using the group-type device using the RF unit and the modem unit, and the investment cost can be saved by reducing the up noise by increasing the number of cable networks and increasing the capacity.

2 is a self-contained system that provides voice and voice band data service using a cable network in a multi-functional group subscriber device designed to provide services to a WLL, B-WLL, and cable network according to a user's needs and environment. It is a block diagram. The multi-functional collective subscriber device may be composed of several self, which is controlled by the entire control unit.

Self is composed of RF part, modem part, switch part, subscriber interface part, self control part and self power part. Among them, other modules except RF part and modem part are commonly used regardless of WLL, B-WLL and cable network. . That is, the multi-function collective subscriber device enables voice band service to the cable network by removing the included RF unit and modem unit according to the present invention.

Each module performs the following functions.

The RF unit is composed of a cable service splitter (Telephony / CATV SPLIT) 8, a transceiver 9, a transmitter 10, a receiver 11, a local oscillator 12, a baseband splitter and a synthesizer 13 .

The cable service splitter 8 performs a function of separating broadcast and voice band services transmitted from the headend (H / E) by using different frequencies through the same cable network. The separated broadcast service is transmitted to the cable broadcast subscriber, and the voice band service is transmitted to the transmit / receive splitter.

The transmit / receive splitter 9 provides separate paths for transmission and reception between subscribers associated with the headend managing voiceband services to the cable network. The transmitter 10 converts signals of different frequency bands before and after the baseband corresponding to each modem received from the power amplifier, baseband offset, and synthesizer to amplify the RF signal when the signal is transmitted to the cable network to the same RF signal. UP-CONVERTER consists of a band pass filter for transmitting only the optimal signal by suppressing out-of-band noise and a gain control device that adjusts the transmission output. Receiving unit 11 is a low-noise amplifier and bandpass filter for amplifying the signal while minimizing the input noise to the signal input from the cable network, the received RF signal to the signal of the different frequency band before and after the baseband according to each modem It consists of a down-converter for converting and a gain control device for keeping the power of a received signal constant.

The local oscillator 12 is a frequency generator for up-converting the baseband signal performed by the transmitter to an RF signal and down-converting the signals of different frequency bands before and after the baseband of the RF signal performed by the receiver. It is connected to the down converter of the converter and the receiver.

The baseband branching and synthesizer 13 converts signals having different frequency bands from the receiver into baseband by transmitting them to each modem, and transmits a plurality of baseband signals received from the modem to the baseband. It is responsible for the function of separating into different frequency bands and transmitting to the transmitter, and the frequency reconstruction of the transmission and reception signal for each modem is controlled by the modem controller according to the number of modem configuration.

The modem unit is composed of L modem chips composed of a D / A converter, an A / D converter, and a baseband processor 15, and a modem control unit 16 for controlling them. The modem unit consists of L modems (L is an integer greater than or equal to 1) on a board that provides k telephone lines (k is an integer greater than or equal to 1), so that M (k x L) lines are provided. Take form. In fact, chips that provide more than one line in a single modem have been developed and produced. In addition, instead of a modem chip, the modem board may be implemented by configuring multiple modem boards. The D / A converter 14 in the modem chip converts a digital signal output from the baseband processor into an analog signal before transmitting to the baseband branching and synthesizer of the RF unit, and the A / D converter 14 performs RF It converts analog signal received from negative baseband branching and synthesizer into digital signal and performs transmission function to baseband processor.

The baseband processor 15 is responsible for signal processing such as modulation and demodulation of signals, spreading and despreading, interleaving and deinterleaving, channel encoding and demodulation, and power control.

The modem controller 16 collects subscriber information requesting performance, line usage status, and call setup of each modem, transmits the information to the self-control unit, and baseband offsets information for reconstructing signals into different frequency bands according to each modem. And to a synthesizer.

The self control unit informs the headend of the self state of the self through the entire control unit with information on the performance and line usage state of the modem received from the modem control unit. Information on the circuit usage status is also transmitted to the subscriber interface unit, informing the subscriber whether the circuit is used when the subscriber requests call setup for origination. In addition, the subscriber information requesting call setup is used as control information for switching the switch unit to enable connection to the desired subscriber.

The switch unit performs the function of connecting the maximum M outgoing lines from the modem unit to the maximum M outgoing lines among N incoming lines (N is an integer greater than M) to perform the aggregation function in the collective apparatus. By using the bidirectional switch, the switch unit enables call setup under the control of the self-control unit even when calling from the subscriber interface unit is required.

The subscriber interface unit is composed of a CODEC unit, a SLIC unit, a ring generation, and a control unit. The CODEC unit 17 converts the 64 Kbps PCM digital voice band signal from the switch into an analog voice band signal, transmits the signal to the SLIC unit, and converts the analog voice band signal from the SLIC unit 18 into a digital voice band signal. do. SLIC unit performs matching function with subscriber device interfaced with existing wired telephone network using RJ-11 connection port. In addition, the ring generation and control unit 19 performs a constant current supply to the subscriber line, the ON / OFF HOOK status detection function of the subscriber device, the function of providing various tones for call processing.

The self power supply unit performs a function of supplying power to each module in the self.

Call establishment and processing in the case of providing a voice band service using the RF unit and the modem unit proposed by the present invention are performed as shown in FIG. 3 and FIG.

3 shows a call setup process when a general telephone subscriber requests an outgoing call for a voice service to a subscriber connected to a group subscriber device.

In general, one subscriber is connected to each line of the multi-line modem, and the headend performs call setup function by converting and transmitting subscriber information received from the switching center into the information system of the modem line. . In the present invention, since the subscriber station is stored in each associated headend, the subscriber station must store the subscriber information stored in each associated headend because it provides the aggregation function to connect multiple subscribers to each line of the multi-line modem by using a timeslot switch. The AND shall be located in the same or different locations as the called party and store the subscriber information contained in each collective subscriber device. In addition, the headend uses the modem's performance and line usage status information received from the entire control unit to determine which modem lines can be connected when called by the called station, and transmits the modem line and called subscriber information to be used for call setup. It should be possible.

The calling station receiving the hook off signal from the calling party generates a dial tone signal. When the calling subscriber sends the address of the called subscriber to the calling station, the calling station connects the line with the called station storing the subscriber information and transmits the subscriber information. The called station sends the received subscriber information to the relevant headend, which informs the subscriber device with the modem line information currently available. The collective subscriber device transmits the subscriber information to the self control unit and uses the subscriber information as switching control information to enable connection to the called subscriber. The call setup for providing voice service is completed by generating a ring tone to the called subscriber desired by the calling subscriber by appropriate switching to the subscriber interface.

4 shows a call setup process when a subscriber connected to a group subscriber device requests transmission for voice and voice band data service.

If there is a modem line to which the calling subscriber can connect, when it is hooked off, it is connected to the modem line through switching and transmits a signal requesting transmission to the headend. When all other subscribers are using the modem line, the self-controller sends the busy signal to the subscriber by informing the subscriber interface of the busy state in advance. In other words, the group subscriber device will also perform partial donation by the switching center. The headend receiving the outgoing request signal from the modem unit transmits a line connection to the calling station or a busy state to the subscriber interface unit depending on whether or not channel allocation is possible.

When a line is connected between the headend and the originating station, a dial-up signal is generated from the originating station, and address information of the called party for the voice and voice band data service, that is, the general subscriber, the subscriber of the group subscriber device, the data service provider, etc. Delivered. The subsequent process is the same as in FIG. In addition, even in the busy state of the line and channel may receive the subscriber subscriber information from the calling party in advance and manages it in the self-control unit to add a function to notify the calling subscriber when the available line and channel is generated to the self-control unit.

In FIG. 3 and FIG. 4, the headend may use a combination of a signal channel and a call channel, or a combination thereof. In the case of using without any distinction between signal and call channel, it has the advantage of being able to connect immediately when the answering party responds because a clear pass channel is set regardless of the answering party's response. It has the disadvantage of causing. On the other hand, when the signal and the call channel are used separately, the caller is requested through the signal channel, and the call channel is allocated only when the called party responds by hooking off. Therefore, there is a risk that the call channel cannot be allocated despite the answer of the called subscriber.

By mounting the RF unit and the modem unit for the voice band service to the cable network of the present invention in a multi-functional group subscriber device, the voice device via the cable network to the subscriber device interfaced to the existing wired telephone network without any additional device or function. Voice band data service is available. In addition, in case of using the group unit equipped with the proposed RF unit and modem unit, the user capacity can be increased by absolutely reducing the noise by enjoying the number of cable installations per headend and the number of modem modem connections. It can be a service environment through much better cable network in Korea.

Claims (4)

A transmission cable service splitter which separates the cable broadcasting and voice band services transmitted on the same coaxial cable, and provides a transmission cable service splitter to each processing unit, and provides a separate communication path between the headend and the multifunctional group subscriber apparatus; From the baseband splitter and the synthesizer, the frequency-separated signal for each modem is converted from the baseband signals before and after input into RF signals of the same frequency band, and then amplifies the transmit power and transmits them to the transmit / receive splitter, The RF signal of each modem is divided into different frequencies before and after the baseband and transmitted to the baseband branch and synthesizer, a local oscillator for generating a frequency for up-down conversion in the transceiver, and a received signal from the receiver. Converts signals in different frequency bands to baseband for each modem RF section composed of baseband branching and synthesizer for transmitting and transmitting a plurality of baseband signals received from the modem section into frequency bands before and after the baseband and transmitting them to the transmitting section, and digital signals of the baseband within the modem as analog signals. D / A and A / D converter which converts and transmits analog signal from baseband branch and synthesizer to digital signal and transmits to baseband processor, and signal modulation and demodulation and spread in modem And a modem consisting of a baseband processor for digital signal processing such as despreading, interleaving and deinterleaving, channel coding and decoding, and power control, and the performance and line usage of each modem constituting the modem. And a modem control unit for transmitting information on the configuration of the modem unit to the baseband branching and synthesizer of the RF unit. Matching board for providing voice band service to cable network in multi-function group subscriber system consisting of modem unit. [Claim 2] The multi-function group subscriber device to the cable network according to claim 1, wherein the baseband branching and synthesizer can reconfigure the frequency of the transmission / reception signal for each modem of the modem unit having a multimodem structure based on the modem controller. Matching board for providing voice band service. The multi-function group subscriber device to the cable network according to claim 1, wherein the modem can provide a plurality of circuit chips for a plurality of voice band services by arranging a plurality of modem chips on a single board. Matching board to provide voice band service. The matching board according to claim 1, wherein the modem comprises a modem unit using multiple modem boards in a standalone modem device.