KR19980056917A - Telephone service provision system in SWAN2 network - Google Patents

Abstract

The present invention relates to a telephone service providing system in a SWAN2 network to provide an analog telephone service using an asynchronous transmission mode (ATM) method of SWAN2 that provides various digital communication services such as VOD and CATV. In the CTIT block, the analog voice signal output from the telephone exchange is converted into digital voice data, and the converted digital signal is multiplexed into an E1 signal having a CEPT structure. Is multiplexed into DS3 signals to be transmitted to the RTIT block through the ATM switch.In the RTIT block, the DS3 signals transmitted from the ATM switch are demultiplexed into ATM cell signals, and the ATM cell signals are converted into E1 CEPT signals. Analog phone service to subscribers by demultiplexing this E1 CEPT signal back into digital voice data and then playing back as an analog voice signal And to supply, there is an effect that enables the analog telephone service through an ATM system SWAN2 network for receiving the same communication function as the VOD service, CATV.

Description

Telephone service provision system in SWAN2 network

The present invention provides a social WElfare Advancement that provides various digital communication services such as Video On Demand and Cable TV (CAble TEleVision) through an Asynchronous Transfer Mode (hereinafter, referred to as ATM). Network 2 (hereinafter referred to as SWAN2) relates to a telephone service providing system in a SWAN2 network capable of providing analog telephone service using the ATM method of the above.

In the conventional SWAN1 network, an analog audio signal transmitted from an analog matching unit of a telephone exchange in a central office (CO) in SWAN1 is converted into digital voice data to generate one E1 CEPT (Conference of European Postal and Telecommunications) signal.

Subsequently, the generated E1 CEPT signal is multiplexed by a Plesiochronous Digital Hierarchy (PDH) together with a CATV, an audio service signal, and the like, and transmitted to the DC.

Then, the DC demultiplexes the multiplexed signal into a service signal destined to a network terminal (NT) of each subscriber, and then transmits each of these separated service signals to each subscriber's NT.

Accordingly, the NT of each subscriber converts the received digital voice data into an analog signal and provides the same to each subscriber.

However, in recent years, the data transmission scheme using a pseudo-synchronous digital hierarchy (PDH) in the SWAN1 network has been changed from a data transmission scheme based on ATM technology.

In addition, the structure of providing a telephone service for each subscriber has also been changed from NT to a Remote Terminal Interface for Telecommunication (RTIT) structure, and a new data transmission method using ATM technology in a SWAM2 network is required.

Accordingly, the present invention has been made in view of the above, and an object thereof is to provide a telephone service providing system in a SWAN2 network to accommodate and provide an analog voice telephone service in an E1 CEPT structure in an ATM network as well as in a SWAN2 network. Is in providing.

The telephone service providing system in the SWAN2 network converts the analog voice signal output from the telephone exchange into digital voice data in the CTIT block, and converts the converted digital signal into CEPT. After multiplexing with the E1 signal of the structure, the E1 CEPT signal is ATM cellized, and then the ATM cell is multiplexed with the DS3 signal to be transmitted to the RTIT block through the ATM switch. Demultiplex to ATM cell signal, convert this ATM cell signal into E1 CEPT signal, and then demultiplex this E1 CEPT signal into digital voice data and play back analog voice signal to provide analog telephone service to subscriber. It is characterized by.

1 is a block diagram of a telephone service providing system in a Swan 2 network according to the present invention;

* Explanation of symbols for main parts of the drawings

10: CTIT block 11: switch analog matching unit

12,42: CEPT interface unit 13,41: ATM interface unit

14: CTIT MA unit 15,44: ATM synchronous clock generator

15: network synchronous clock generator 20,30: ATM switch

40: RTIT block 43: subscriber analog matching unit

45: RTIT MA part 45: ring signal generator

1 is a block diagram of a system for providing a telephone service in a SWAN2 network according to the present invention. The CTIT block 10 for cell multiplexing an analog voice signal of a telephone switch into a DS3 signal, and the multiplexing in the CTlT block 10 is shown in FIG. A transmission side ATM switch 20 for appropriately multiplexing the transmitted DS3 cell signal and CATV cell signal and VOD cell signal for providing a service to the reception side, and the DS3 switched and transmitted by the transmission side ATM switch 20. ATM receiver 30 for demultiplexing cell signals and DS3 cell signals demultiplexed through ATM switch 30 are demultiplexed to reproduce analog voice signals, and the reproduced voice signals are transmitted to each subscriber. It consists of an RTIT block 40 which is a receiving system of a remote place to output.

The CTIT block 10 converts the analog voice signal of the exchange into digital voice data and switches the analog matcher 11 to detect signaling signals such as a ringing signal. The CEPT interface unit 12 multiplexes the converted digital voice data and the detected signaling signal into an E1 signal having a CEPT structure, and ATM cellizes the E1 signal of the CEPT multiplexed by the CEPT interface unit 12, which is then DS3 ( A digital signal) and multiplexes the ATM interface unit 13 for transmitting the ATM switch 20 to the ATM switch 30 of the RTIT 40 block and the CEPT frame of the CEPT interface unit 12 through the ATM switch 20. CTIT MA (Maintenance and Adminstration) unit 14 for collecting and managing information and various kinds of information related to the maintenance and the CEPT interface unit 14 by receiving the clock of the ATM switch 20 through the ATM interface unit 13 ) Generation of a network synchronous clock for generating the required clock and supplying the ATM switch 20 by generating a clock for system-wide synchronization according to the clock of the digital office timing supply (DOTS) of the OC. It consists of a part 16.

The RTIT block 40 further demultiplexes the demultiplexed DS3 cell signal through the ATM switch 30 and restores the demultiplexed DS3 cell signal to an E1 signal having a CEPT structure. A CEPT interface unit 42 for demultiplexing the E1 signal of the CEPT structure restored by the ATM interface unit 41 to detect digital voice data and a signaling signal, and the digital voice data detected by the CEPT interface unit 42. Converts into an analog voice signal and provides a subscriber analog matching unit 43 for providing a reproduced voice to the subscriber, and receives the clock of the ATM switch 30 through the ATM interface unit 41 to the CEPT interface unit 42. An ATM synchronous clock generator 44 for generating and supplying a required clock; and an RTIT NA unit 45 for collecting and managing information on the CEPT frame of the CEPT interface unit 42 and various information related to maintenance; And a ring signal generator 46 for generating a ring signal for ringing the subscriber's telephone according to the signaling signal detected by the CEPT interface 42 and supplying it to the subscriber analog matcher 43.

In the RTIT block 40, the ATM switch 30 is synchronized with the network synchronizer clock supplied to the ATM switch 20 of the CTIT block 10, thereby eliminating the need for a separate network synchronization clock generator.

Referring to the operation of the analog telephone service providing system in the SWAN2 network of the present invention configured as described above are as follows.

First, in the CTIT block 10, the switch analog matching unit 11 A / D converts 30 subscriber's analog voice signals inputted from the switch into 64 Kbps of digital voice data, inserts them into the corresponding time slots of the CEPT structure, and the ring signal. Detects a signaling signal and transmits the signal to the CEPT interface unit 12.

In addition, the switch analog matching unit 11 D / A-converts 30 digital sound line data inputted from the CEPT interface unit 12 into an analog voice signal, performs a signaling process, and transmits the same to the switch.

Subsequently, the CEPT interface unit 12 processes the data and signaling signals of 30 subscribers, that is, 120 subscribers, into four E1 CEPT structures, each of which is converted into digital data by the switch analog matching unit 11.

On the contrary, the CEPT interface unit 12 demultiplexes data and signaling signals in four 2.048 Mbps CEPT frame structures input from the ATM interface unit 13 and supplies them to the four switch analog matching units 11.

Subsequently, the ATM interface unit 13 receives up to eight E1 CEPT signals processed by the CEPT interface unit 12, ATM cellizes them, and multiplexes them into DS3 signals to transmit them to the ATM switch 20.

In addition, the ATM interface 13 demultiplexes the DS3 signal input from the ATM switch 20 and restores the cellized signal to the E1 CEPT signal to supply the CEPT interface unit 12.

On the other hand, the ATM synchronous clock generator 15 receives the 44.736MHZ clock output from the ATM switch 20 through the ATM interface unit 13 to each of the ATM interface 13 and CEPT interface 12 required for each. The clocks of 38.88MHz, 2.43MHz, 22.37MHz and 4.096MHz are generated and supplied respectively.

In addition, the CTIT MA unit 14 collects and manages various kinds of information on the CEPT frame multiplexed by the CEPT interface unit 12 and various kinds of information related to maintenance.

In addition, the network synchronous clock generation unit 16 receives a 2.048 MHz clock from the DOTS of CO, generates a clock of 8 kHz for system-wide synchronization, and supplies it to the ATM switch 20.

Subsequently, the DS3 cell signal output through the ATM switch 20 is input to the ATM interface unit 41 through the ATM switch 30 on the RTIT block 40 side.

Accordingly, the ATM interface 41 of the RTIT block 40 on the receiving side demultiplexes the DS3 cell signal and restores the demultiplexed DS3 cell signal to the CEPT interface 42 by restoring the demultiplexed DS3 cell signal to the CEPT structure. Output

Then, the CEPT interface unit 42 demultiplexes the E1 signal of the CEPT structure restored by the ATM interface unit 41, extracts the digital voice data and the signaling signal, that is, the ring bit signal, and detects the enable signal.

Subsequently, the subscriber analog matching unit 43 converts the digital voice data detected by the CEPT interface unit 42 into an analog voice signal and provides the reproduced voice to the subscriber.

At this time, the enable signal detected by the CEPT interface 42 is output to the ring signal generator 46 to generate a ring signal to the subscriber analog matcher 43.

Accordingly, the subscriber analog matching unit 43 rings the subscriber telephone by the ring signal so that the subscriber can hear the analog voice signal reproduced through the telephone when the subscriber picks up the receiver.

As described above, the overall operation of the RTIT block 40 is almost similar to that of the CTIT block 10, but there are differences in the following points.

That is, since the CTIT block 10 processes the exchange analog signal, the switch analog matching unit 11 may detect the hook on / off signal and the ring signal, but the subscriber of the RTIT block 40 may detect the hook signal. The analog matcher 43 detects the hook on / off signal input from the subscriber, and the ring signal generator 45 is extracted from the CEPT signal through an enable signal detected from the extracted ring bit signal. The ring signal generated from) can raise the ring of the subscriber's telephone.

In addition, CTIT block 10 multiplexes the ring signal to CEPT and demultiplexes the hook signal from CEPT, while RTIT block 40 multiplexes the hook signal to CEPT and demultiplexes the ring signal from CEPT.

In addition, since the CTIT block 10 receives a 2.048 MHz clock from DOTS, generates a clock of 8 KHz necessary for network synchronization, and supplies it to the ATM switch 20, the RTIT block 40 synchronizes the clock from the ATM switch 20 with the clock. The 44.736MHz clock is used to eliminate the need for the network synchronization clock generator.

As described above, the present invention has an effect of enabling an analog telephone service through a SWAN2 network that transmits data based on an ATM method by accommodating various communication service functions such as VOD and CATV.

Claims (1)

A switch analog matching unit 11 for converting the analog voice signal of the exchange into digital voice data and detecting the signaling signal, and the digital voice data converted by the switch analog matching unit 11 and the detected signaling signal of the CEPT structure. A CEPT interface unit 12 multiplexed with an E1 signal, an ATM cell unit 13 for multiplexing the E1 signal of the CEPT multiplexed by the CEPT interface unit 12, and then multiplexing it into a DS3 signal and outputting the same; The CTPT MA unit 14 collects and manages information on the CEPT frame of the CEPT interface unit 12 and various information related to maintenance, and receives the clock of the ATM switch through the ATM interface unit 13 to receive the CEPT. An ATM synchronous clock generation unit 15 for generating and supplying a clock required for the interface unit 14 and a clock for system-wide synchronization according to the clock of the DOT of the OC and generating the clock for the ATM switch. A CTIT block 10 including a network synchronization clock generation unit 16 to supply a cell, and multiplexing and receiving a DSV cell signal multiplexed in the CTIT block 10 and a CATV cell signal and a VOD cell signal for providing other services Through the transmitting ATM switch 20 for transmitting to the side, the receiving ATM switch 30 for demultiplexing the DS3 cell signal transmitted by being switched by the transmitting ATM switch 20, and the ATM switch 30. An ATM interface unit 41 for demultiplexing the demultiplexed DS3 cell signal and restoring the demultiplexed DS3 cell signal to an E1 signal having a CEPT structure, and an E1 signal having a CEPT structure restored by the ATM interface unit 41; CEPT interface unit 42 for demultiplexing and detecting digital voice data and signaling signals, and converting digital voice data detected by CEPT interface unit 42 into analog voice signals to provide reproduced voice to subscribers. The ATM synchronous clock generator 44 which receives the clock of the ATM switch 30 through the subscriber analog matching unit 43 and the ATM interface unit 41 and generates and supplies a clock required for the CEPT interface unit 42. And a RTIT MA unit 45 for collecting and managing information on the CEPT frame of the CEPT interface unit 42 and various information related to maintenance, and a subscriber according to the signaling signal detected by the CEPT interface unit 42. In the SWAN2 network SWAN2, characterized in that it consists of an RTIT block 40 consisting of a ring signal generator 46 for generating a ring signal for ringing a telephone and supplying it to the subscriber analog matcher 43. Telephone service delivery system.