KR0140174B1 - Frame mapping and demapping apparatus - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plane mapping / demapping device, wherein the subscriber network between subscriber access / terminal devices in a CATV network is an analog to a subscriber in a distribution center when it is a time division multiplexer / polling network. Frame matching means (21) for matching frames to provide telephone service (POTS); Signaling conversion means 22 for rearranging time slots; Frame mapping means 23 for rearranging time slots according to time slot control signals and transmitting them to external subscribers; Remaping and remapping time slots according to time slot control signals Frame demapping means 24 for outputting a frame; and time slot control means 25 for outputting a type slot control signal to increase subscriber capacity and provide analog telephone service (POT) to subscribers at low cost. It can be effective.

Description

Frame Mapping / Demapping Device

1 is an example of the overall configuration of a cable television system to which the present invention is applied.

2 is a block diagram of an embodiment of a frame mapping / demapping apparatus according to the present invention.

3A and 3B are explanatory diagrams for frame configuration and channel allocation of the frame mapping unit.

4A and 4B are explanatory diagrams for frame configuration and channel allocation of the frame demapping unit.

* Explanation of symbols for the main parts of the drawings

21: High-density bipolar 3-cord (HDB3) matching unit 22: Signaling conversion unit

23: frame mapping unit 24: frame de-mapping unit

25: timeslot control unit

The present invention provides an analog telephone service (POTS) to a subscriber in a distribution center when a subscriber network between subscriber access / terminal devices in a CATV network is a time division multiplexing / poly (TDM / Polling) network. It relates to a frame mapping / demapping apparatus for.

In general, when a subscriber terminal of an optical cable television (CATV) network accepts an analog telephone service (POTS), a European type applicable to the optical cable television (CATV) network for transmitting voice and signaling signals during the exchange with the subscriber. It can be configured by transmitting a CEPT frame.

In other words, when looking at the state of the transmission of analog telephone service (POTS) from the exchange side to the subscriber, the central office (CO) matches the analog voice signal with the switch subscriber device and converts this signal into a European-like pseudo-synchronous device composed of 30 voice signals and signaling signals. The signal is multiplexed into a CEPT frame and transmitted to the distribution center. In the distribution center, 30 voices in a European CEPT frame are used to transmit a European CEPT signal transmitted from a central office (CO) to a terminal device from an optical cable television (CATV) connection device. Voice and signaling data are mapped to the subscribers through the European Similar Synchronous Signaling (CEPT) for the number of channels desired by the subscriber in the channel, and then transmitted to the subscriber.

The time division multiplexing / poly (TDM / Polling) network consists of a PON (Passive Optical Network) structure in which one subscriber simultaneously transmits video and two-way communication service signals from an access device to three subscriber stations. The subscriber transmits a polling signal from the access device to the subscriber station in order to receive the video and two-way communication service. The subscriber station receiving the polling signal can receive a video service and a bidirectional communication service signal when they are the same as compared with a subscriber identifier. In addition, in order to transmit the video channel selection information and the bidirectional communication service signal, the subscriber station transmits the selection information and the bidirectional communication service signal in a time division multiplexing (TDM) scheme to a time slot designated by a polling signal of a distribution center. . Here, the analog telephone service (POTS) can be considered as a two-way communication service, which is a channel for providing analog telephone service (POTS) to a subscriber. Provide subscribers with analog telephone service (POTS).

However, in the conventional frame mapping / demapping apparatus, the distribution center of the optical cable television (CATV) network and the subscriber providing service topology use a point-to-point technology to provide a voice signal corresponding to each subscriber. Time slots 1, 2,... Of the European PPT frame. Order and receive the signaling signals in timeslots 17, 18... By accepting each subscriber's analog telephone service (POTS) information in a predetermined time slot, the analog telephone service (POTS) between the distribution center and the subscriber station is determined by the time slot 1 of the European Similar Synchronous Signaling (CEPT) frame. It becomes the first timeslot of the voice signal, and timeslot 17 is designated as the first timeslot of the signaling signal and transmitted and received.

Accordingly, the conventional frame mapping / demapping apparatus for providing analog telephone service in a point-to-point structure transmits and receives a voice signal and a signaling signal in a manner of specifying a time slot in advance, and thus time division multiplexing / polling (TDM / There is a problem in that analog telephone service cannot be accommodated in a CATV network having a polling structure.

In order to solve the above problems, the present invention provides a voice per one subscriber to receive a voice / signaling signal of three subscribers in a time slot of a 2.048 Mb / s European Similar Synchronous Signaling (CEPT) frame in one subscriber access device. Three channels are provided to accommodate the first subscribers in timeslots 1, 2 and 3, the second subscribers in timeslots 4, 5 and 6, the last third subscribers in timeslots 7, 8 and 9, The signaling signal is received in timeslots 17, 18, and 19, the signaling signal of the second subscriber is received in timeslots 20, 21, and 22, and the signaling signal of the third subscriber is received in timeslots 23, 24, and 25. To relocate the timeslot and to transmit the CEPT frame transmitted from each subscriber to the central office. European pseudo-synchronous signaling (CEPT) that accepts three voice and signaling timeslots and 30 voice / signaling signals to accommodate voice signals in time slots 1, 2 and 3 and signaling signals in timeslots 17, 18 and 19. It is an object of the present invention to provide a frame mapping / demapping apparatus for relocating timeslots into frames.

In order to achieve the above object, the present invention, by receiving a high-density bipolar three-code (HDB3) line coded European pseudo-synchronous signaling (CEPT) frame from an external optical transmission device, extracts the voice signal and the downlink signaling signal, High density bipolar tricode matching means for receiving a mapped frame signal and an uplink signaling signal and matching the high density bipolar tricode (HDB3) line-coded European pseudosynchronous signaling (CEPT) frame to the optical transmission device ; Receives a downlink signaling signal from the high density bipolar three-code matching unit and rearranges the timeslot to output a downlink signaling signal, and receives a uplink signaling signal to rearrange the timeslot and upstream to the high density bipolar three-code matching unit. Signaling conversion means for outputting a signaling conversion signal; Matching the high density bipolar three code Frame mapping means for receiving a voice signal from the means and receiving a downlink signaling signal from the signaling conversion means to rearrange the time slots according to a time slot control signal and transmit the time slots to an external optical subscriber access device; Receives a European CEPT frame from the optical subscriber access device and rearranges the timeslot according to the timeslot control signal to output a demapped frame signal to the high-density bipolar tricode matching means, and uplink signal Frame demapping means for extracting a signal and outputting it to the signaling conversion means; and a time slot control means for outputting a time slot control signal specifying a voice channel serviced to subscribers to the frame mapping means and a frame demapping means. It is characterized by.

Hereinafter, with reference to the accompanying drawings will be described an embodiment according to the present invention;

1 is an example of the overall configuration of a cable television system to which the present invention is applied.

As shown in the drawing. Two-way communication service signal multiplexer (1) multiplexes 2.048Mb / s European Similar Synchronous Signaling (CEPT) signal to 45Mb / s DS3 signal for two-way transmission of telephone service signal to central office, and European similar synchronous signaling method. The (CEPT) frame signal matching section 2 is electrically connected to a high density bipolar three code (HDB3) line coded European pseudosynchronous signaling (CEPT) signal.

The 2.048 Mb / s mapping unit 3 reconstructs the European Similar Synchronous Signaling (CEPT) signal in which 30 voice signals are fully accommodated so that the three subscriber stations can recognize each voice and signaling signal, and 2.048 Mb / s De-mapping unit 4 is a portion that matches with the European PPT frame signal transmitted from the subscriber side, and the European pseudo-synchronous signaling system receiving the three-channel voice transmitted from the subscriber side and the corresponding signaling signal. (CEPT) frame data is reconstructed into a fully-accepted European pseudo-synchronized signaling (CEPT) frame to accommodate 30 voices and corresponding signaling signals.

The optical cable television subscriber access device 5 is a subscriber access device for delivering digital video signals, audio signals, polling signals, and two-way communication services (e.g., analog telephone service, narrowband integrated telecommunication network, etc.) to the subscriber. The 2.048 Mb / s channel of the 155 Mb / s optical signal is open to accommodate analog telephone service (POTS).

The subscriber network 6 having a PON structure distributes the downlink (subscriber access device → subscriber station) signal to three subscribers using an optical splitter and provides three subscriber signals using an optical coupler. Is a network that accepts the uplink (subscriber terminal device → subscriber access device) signal in a time division multiplexing (TDM) manner and provides a service.

The 155 Mb / s signal demultiplexer and the time division multiplexing / polling unit 8 in the subscriber station 7 perform digital video and audio signals, bidirectional communication service signals and polling on the 155 Mb / s signal transmitted from the subscriber access device downward. It separates the Polling signal and transmits a time division multiplexing (TDM) signal upward.

The comparator 9 may receive a polling signal among signals transmitted from the subscriber access device and receive a digital video signal or an audio service when it is identical with a subscriber ID.

The time slot designation unit 10 transmits the desired video channel selection information (using 64kb / s channel) and analog telephone service (POTS) signal (using 2.048Mb / s channel) to the timeslot designated by the polling signal. Transmit in time division manner.

The time slot designation control unit 11 designates a time slot using the subscriber identity (Identifier) in the analog telephone service matching unit, and the subscriber identity (Identifier) in the European Similar Synchronous Signaling (CEPT) signal transmitted from the subscriber access device. Extract the corresponding timeslot and use it as analog voice service signal.

FIG. 2 is a diagram illustrating an embodiment of a frame mapping / demapping apparatus according to the present invention, in which time-division multiplexing / poly (TDM) of a European pseudo-synchronous signaling (CEPT) frame signal fully accommodating 30 voice signals to three subscribers / Polling) to provide a voice channel.

The high-density bipolar three-code (HDB3) matching unit 21 receives a European pseudo-synchronous signaling (CEPT) signal that completely receives 30 channels of high-density bipolar three-code (HDB3) line-coded, extracts a voice signal, and maps the frame. The signal is transmitted to the unit 23, and the signaling signal for the corresponding channel is extracted and output to the signaling converter 22.

The signaling converter 23 uses a digital time switch to enable the subscriber side to recognize the signaling signal extracted from the high-density bipolar 3-code matching unit 21 by using a channel associated signaling (CAS) scheme (CEPT frame). In the method of transmitting the signaling signal using timeslot 16) from the common channel signaling (CCS) method (the method of transmitting the signaling signal using a voice channel or another signal channel among CEPT frames). It is transmitted to the frame mapping unit 23, and also receives the signaling information extracted by the frame demapping unit 24 and 2.048Mb / which 30 channels are fully accommodated to the common channel signal (CCS) signaling data corresponding to each channel s After rearranged in the European Similar Synchronous Signaling (CEPT) frame by the channel association signal (CAS) method and output to the high-density bipolar tri-cord matching unit 21.

The frame mapping unit 23 performs time division multiplexing / polling by using three subscribers as one subscriber group (subscriber 1 group) in the European pseudo-synchronous signaling (CEPT) signal transmitted from the high-density bipolar 3-code matching unit 21. (TDM / Polling) transmits the voice channel. In the CEPT signal, which fully accepts 30 channels, the CEPT is transmitted from the high density bipolar 3-cord matching unit 21 to provide 9 channels of voice channels to the subscriber group. Time slots 1-9 of the signal are mapped to timeslots 1-9 on the side of subscriber 1 using digital switches, and timeslots 0-15 and 17-19 are mapped to timeslots 1-9 on the side of subscriber 2 on the side of the subscribers. Map 20-28 timeslots to 3rd party side timeslots 1-9, time slots 29-31 and timeslots 1-6 of the next European Similar Synchronous Signaling (CEPT) frame to 4th party side timeslot 1- Maps to 9. In this way, there are ten subscriber groups that can be mapped from three European pseudo-synchronous signaling (CEPT) signals. In addition, the signaling signal extracted from the signaling conversion unit 22 is rearranged to a signaling channel corresponding to each voice signal and transmitted to the subscriber access apparatus.

The frame demapping unit 24 extracts the voice data located at timeslots 1, 2, and 3 from the 2.048 Mb / s European Similar Synchronous Signaling (CEPT) signal transmitted from the subscriber access device by using a digital switch. It demaps to a 2.048 Mb / s European PPT frame that fully accommodates 30 channels, and also extracts signaling for the corresponding channel of each subscriber and transmits it to the signaling converter 22.

The time slot controller 25 is a controller for designating a voice service channel serviced to each subscriber. Mapping / demapping to rearrange the time slots between a fully accommodated 2.048 Mb / s European Similar Synchronous Signaling (CEPT) frame signal with 30 channels and a 2.048 Mb / s European Similar Synchronous Signaling (CEPT) signal transmitted and received from subscribers. Controls a negative digital time switch.

3A and 3B are explanatory views of the frame configuration and channel allocation of the frame mapping unit.

In the European Similar Synchronous Signaling (CEPT) frame 31 which completely receives 30 channels of voice signals, signaling is used as a channel associated signaling (CAS) method in time slot 16.

The voice signals from the European Similar Synchronous Signaling (CEPT) frame 31 signal, which fully accommodates 30 voice signals, to the mapping frame 32 for transmitting the voice and signaling signals to the subscriber group in the order of timeslots 1-9. And signaling signals are mapped in timeslot 17-25 order. Three CEPT frame signals fully receiving 30 channels of voice signal can be mapped to 10 subscriber groups.

4A and 4B are explanatory views of the frame configuration and channel allocation of the frame demapping unit.

The 2.048 Mb / s European Similar Synchronous Signaling (CEPT) frame 41, which has been transmitted in a time-division multiplexed (TDM) manner per subscriber, receives voice signals in timeslots 1-3 and timeslots 17-19. Signaling signal is used (see FIG. 4B).

In order to transmit a 2.048 Mb / s European pseudo-synchronous signaling (CEPT) frame 41 signal transmitted by a time-division multiplexing (TDM) method per subscriber to the high-density bipolar tricode matching unit 21, The mapping unit 24 demaps the 2.048 Mb / s European Similar Synchronous Signaling (CEPT) frame 41 signal, which has been transmitted in 30 subscriber groups by one time-division multiplexing (TDM) method, into three frame signals. can do.

As described above, the present invention provides one frame mapping unit that must exist for each subscriber when providing a point-to-point service between a distribution center and a subscriber in a CATV network. This can increase subscriber capacity and provide analog telephone service (POTS) to subscribers at low cost.

Claims (5)

A high density bipolar 3-code (HDB3) line-coded European Similar Synchronous Signaling (CEPT) frame is input from an external optical transmission device, and a voice signal and a downlink signaling signal are extracted. A high density bipolar tricode matching means for receiving an input and matching the HDB3 line-coded European pseudosynchronous signal frame and outputting the same to the optical transmission device; receiving a downlink signal from the high density bipolar three code matching means Signaling conversion means for receiving a rearranged time slot to output a downlink signal conversion signal, and receiving an uplink signaling signal to rearrange the time slot to output an uplink signaling signal to the high-density bipolar 3-code matching means; A voice signal is input from a three-cord matching means; Receiving the down-converted signal from the signaling conversion means to rearrange time slots in accordance with the time slot control signal for transfer to an external device connected to the optical network frame mapping means; Receives a European CEPT frame from the optical subscriber access device and rearranges the timeslot according to the timeslot control signal to output a demapped frame signal to the high-density bipolar three-code matching means, and an uplink signaling signal. Frame demapping means for extracting and outputting the signal to the signaling transform means; And timeslot control means for outputting a timeslot control signal for specifying a voice channel serviced to subscribers to said frame mapping means and frame demapping means. The method of claim 1, wherein the frame matching means, the frame mapping means, and the frame demapping means, respectively, Frame mapping / demapping apparatus, characterized in that configured using a digital time switch. The method according to claim 1 or 2, The frame mapping means receives a voice signal of a CEPT signal transmitted from the high-density bipolar 3-code matching means, receives a downlink signaling signal from the signaling conversion means, and receives the time slot control means. By relocating the timeslot according to the timeslot control signal from the system, three subscribers are formed into one subscriber group, and nine voice channels and signaling channels are mapped to the European Similar Synchronous Signaling (CEPT) frame in one subscriber group. Frame mapping / demapping apparatus characterized in that the transmission to the optical subscriber access device in a time division multiplexing / polling (TDM / Polling) method. 3. The apparatus according to claim 1 or 2, wherein the frame demapping means transmits the three voice channels and the signaling channels transmitted from the optical subscriber access device to the high density bipolar triple matching means. And relocating the timeslots according to the timeslot control signals from the slot control means to map signals transmitted from ten subscribers into one European pseudo-synchronous signaling (CEPT) frame. The method according to claim 1 or 2, wherein the signaling conversion means comprises: a common signaling signal (CCS: downlink signaling signal of a channel associated signaling (CAS) method transmitted from the high density bipolar tricode matching means); After rearranging the downlink signaling signal of the Common Chanel Signaling method and transmitting it to the frame mapping means, the signaling signal of the common line signal (CCS) method extracted by the frame demapping means is rearranged by the channel association signal (CAS) method. And later to the high density bipolar tricode matching means.