KR950001568B1 - B channel interface circuit between optical CATV subscriber terminal / connection - Google Patents

Abstract

None.

Description

B channel interface circuit between optical CATV subscriber terminal / connection

1 is an overall configuration diagram of the present invention.

2 is a block diagram of a B channel interface unit on the exchange side according to the present invention.

3 is an interface diagram for accommodating CEPT data and signal channels in a 51 Mb / s frame.

4 is a 51M frame structure diagram.

5 is a detailed configuration diagram of a 64K signal channel processing unit.

6 is a block diagram of a B-channel interface unit on the subscriber side according to the present invention.

* Explanation of symbols for main parts of the drawings

21, 61: overvoltage protection unit 22: hook on / off detection unit

23: SLIC part 24, 64: filter part

25, 65: CODEC section 26, 66: CEPT framer section

27, 67: CEPT framer and microprocessor interface

28, 68: 2.048M data channel interface unit

29: ring signal detection unit 30, 70: 64K signal channel interface unit

31, 71: microprocessor unit 62: ring signal reproduction unit

63: hook on / off detection unit 69: ring signal generation unit

72: S / P conversion unit

The present invention relates to an interface circuit for receiving analog telephone service between a distribution center and a subscriber in an optical CATV network providing a video service through an optical fiber.

When accepting existing subscriber telephone service in optical CATV terminal device in subscriber's home, interface circuit for processing voice signal and interface for processing voice signal transmitted / received to / from exchange in optical CATV connection device in telephone company or distribution center It consists of a circuit.

In the conventional case, since voice telephone service delivered from an exchange and an existing telephone in a telephone company is an electrical analog signal, it is not only possible to directly transmit analog voice transmission through an optical fiber in an optical CATV network in the same way as a conventional metallic two-wire system. Call processing signals such as hook on / off, ring tone and various tones also cause many problems.

Accordingly, the present invention has been made to solve the above problems, and by distributing and processing the audio signal for the analog telephone subscriber line to be suitable for the optical CATV network, the image distribution service without using a separate metallic loop in the optical CATV network. The object of the present invention is to provide a B-channel interface circuit between a subscriber station / connection device for an optical CATV that can accommodate a telephone service using an optical fiber.

In order to achieve the above object, the present invention provides an interface circuit for processing voice signals transmitted and received with an exchange in an optical CATV connection device in a telephone company or distribution center, comprising: hook on / off reproducing means connected to an exchange side; Subscriber line interface (SLIC) means connected to said hook on / off reproducing means; Encoding and decoding (CODEC) means connected to said subscriber line interface means; CEPT framer means connected to the encoding and decoding means; 2.048M data channel interface means coupled to the CEPT framer means and a 51M framer / reframer; 64K signal channel interface means connected to said 51M framer / reframer; Ring signal detecting means connected to said hook on / off reproducing means and a 64K signal channel interface means; Control means connected to said ring signal detecting means and to encoding and decoding means; And an exchange side interface circuit having a CEPT framer and a microprocessor interface means connected between the control means and the CEPT framer means, and an interface for processing a voice signal to accommodate an existing subscriber telephone service in an optical CATV terminal device in a subscriber plane. A circuit, comprising: ring signal reproducing means connected to a subscriber telephone; Ring signal generating means connected to said ring signal reproducing means; Hook on / off detection means connected to the ring signal reproducing means and ring signal generating means; 64K signal channel interface means connected to said ring signal generation means, hook on / off detection means and a 51M leaframer / framer; Encoding and decoding means coupled to the hook on / off detection means; CEPT framer means coupled to the encoding and decoding means; 2.048M data channel interface means coupled between the CEPT framer means and a 51M leaframer / framer; Control means connected to the ring signal generating means; Serial / parallel changing means connected between said encoding and decoding means and a control means; And a framer and microprocessor interface means connected between the CEPT framer means and the control means.

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

1 is an overall configuration diagram of a communication system to which the present invention is applied, 1 is a B channel interface unit connected to an exchange side, 2 is a B channel interface unit connected to an existing subscriber telephone, 3 and 3 'are 51M framers, 4 and 4 'represents a 155M multiplex / demultiplexer, respectively.

The B-channel interface unit 1 on the exchange side receives an analog voice signal transmitted from the exchange side and a call processing signal that cannot pass through the band pass filter, and processes a voice channel and a signal channel signal of a CEPT frame, or a signal processing signal. It is accommodated in a separate 64K signal channel and is received in the 2.048M channel and 64K channel of the 51M framer (3), respectively, and transmitted to the subscriber side. After extracting 2.048M data from 51M leaframer and processing it as voice data, 51M signal transmitted from subscriber side to exchange side is processed into voice data and transmits analog voice signal to switch, and incoming telephone from 2.048M frame signal channel or 64K signal channel The call processing state of is reproduced on the tip / ring in the same way to the exchange side.

The B channel interface unit 2 on the subscriber station side receives and detects the 2-wire analog voice signal from the phone and the call processing state of the phone, receives the voice channel and the signal channel of the CEPT frame, and transmits the signal as a 2.048M signal. Or, it is accommodated in the 51M framer (3) using a 64K signal channel in the 51M frame to accommodate the electrical level signal of the home subscriber line state in a separate channel.

In addition, it processes 2.048M signal transmitted from 51M framer to transmit analog voice signal to telephone and reproduces call processing signal of exchange that comes from CEPT frame data channel or 64K signal channel.

The 51M framer / framer (3,3 ') and the 155M multiple / demultiplexer (4,4') have been patented by the present applicant (Application Nos. 90-11067, 90-11068), and two TV signals (TV1, TV2) and FM signals are multiplexed and demultiplexed. In the present invention, a telephone service is accommodated using a 2.048M data channel and a 64K signal channel among 51.08M frames, and one subscriber can extend up to 30 lines.

2 is a detailed configuration diagram of the B-channel interface unit 1 on the exchange side, in which 21 is an overvoltage protection unit, 22 is a hook on / off reproducing unit, 23 is a subscriber line interface unit SLIC, 24 Is a filter part, 25 is a codec part, 26 is a CEPT framer part, 27 is a CEPT framer and microprocessor interface part, 28 is a 2.048M data channel interface part, 29 is a ring signal detection part, 30 is a 64K signal channel interface part And 31 denote microprocessor sections, respectively, and are connected as shown in the drawing.

Hook on / oak reproducing unit 22 connected to the exchange side and a subscriber line interface unit (SLIC) connected to the hook on / off reproducing unit for processing voice signals transmitted and received with the exchange in an optical CATV connection device in a telephone company or distribution center. 23, an encoding and decoding (CODEC) unit 25 connected to the subscriber line interface unit, a CEPT framer unit 26 connected to the encoding and decoding unit, the CEPT framer unit and a 51M framer / reframer ( 3) a ring connected to a 2.048M data channel interface unit 28 connected to 3), a 64K signal channel interface unit 30 connected to the 51M framer / reframer 3, the hook on / off reproducing unit, and a 64K signal channel interface unit. CEPT frame connected between the signal detector 29, the microprocessor unit 31 connected to the ring detector and the encoding and decoding unit, and the microprocessor unit and the CEPT framer unit. Murray and is configured with a microprocessor interface unit 27.

The 2.048M data channel interface unit 28 is a PCM-modulated voice signal to form a CEPT frame, and then an interface unit for receiving CEPT data, which is 2.048 Mb / s bit stream in a 51M frame, the detailed structure and operation of which are shown in FIG. Replace with explanation. In addition, the detailed structure and operation of the signal channel interface unit 30 for accommodating the signal detected by the ring signal detection unit 29 in the 64K signal channel are replaced with the description of FIG.

FIG. 3 is an exemplary configuration diagram of the 2.048M data channel interface unit 28 of FIG. 2 and is composed of an elastic buffer connected between the CEPT framer unit 26 and the 51M framer / reframer 3. .

As shown in the figure, 2.048M data is inputted and outputted from the CEPT framer unit 26 using a 2.048 MHz clock, and the 2.048M data gapped using the 2.048M clocked GAP is used for the 51M framer / Sends and receives with leaf reamer. The 2.048M data and the gapped 2.048M data have the same average data rate, but in order to compensate for the data rate difference at a constant time, the CEPT bit strip data is converted into 51M frames using an elastic buffer. In the 2.048M channel.

4 is a 51M frame structure diagram used in the present invention, in which the FAW is 12 bits allocated for frame synchronization, the CIB is 12 bits allocated for channel discrimination signals, and pri is 4 bits allocated for the primary channel. X is 5 bits allocated for reserve, 20 bits assigned to SIG, 2B + D, and B are for respective signals, and 20 bits allocated to M & A are bits for maintenance signals.

FIG. 5 is a block diagram of an exemplary embodiment of the signal channel processing unit (ring signal detector 29 and signal channel interface unit 30) of FIG. 2, in which 51 is a call processing signal reproducing unit and 54 is a call processing signal detecting unit. Reference numerals 52 and 56 denote 2.048M channel interface portions, and 53 and 56 denote 64K signal channel interface portions, respectively.

Therefore, when such a circuit is applied to the present invention, the 64K clock is received from the 51M framer 3 and received in the 64K signal channel in order to detect the call signal of the exchanger and receive the signal in a separate signal channel. In addition, the subscriber line state is reproduced to the exchange side using the 64K signal data from the 51M fl framer 3.

6 is a detailed configuration diagram of the B-channel interface unit 2 on the subscriber side according to the present invention, in which 61 is an overvoltage protection unit, 62 is a ring signal reproduction unit of an exchange, 63 is a hook on / off detection unit, and 64 is a filter. Where 65 is a codec part, 66 is a CEPT framer part, 68 is a 2.048M data channel interface part, 72 is a serial / parallel conversion part, 69 is a ring signal generation part, 70 is a 64K signal channel interface part, 71 is a microprocessor unit. A ring signal reproducing unit 62 connected to the subscriber telephone, a ring signal generating unit 69 connected to the ring signal reproducing unit, for processing a voice signal for accommodating an existing subscriber telephone service in an optical CATV terminal device in a subscriber home; A hook on / off detection unit 63 connected to the ring signal reproducing unit and a ring signal generating unit, and a 64K signal channel interface unit connected to the ring signal generator, hook on / off detecting unit and 51M framer / reframer 3 '. 70, an encoding and decoding unit 65 connected to the hook on / off detection unit, a CEPT framer unit 66 connected to the encoding and decoding unit, the CEPT framer unit, and a 51M framer / reframer 3 '. A 2.048M data channel interface unit 68 connected between the control unit; a control unit 7 connected to the ring signal generation unit; and serial / parallel conversion means 72 connected between the encoding and decoding unit and the control unit; And a framer and a microprocessor interface unit 67 connected between the CEPT framer unit and the control unit.

The B channel interface unit present at the subscriber side is connected as shown in the figure, and a separate ring signal generator 69 must be present to reproduce the call signal transmitted from the exchange, and hook on / off. The detector detects the line status of the telephone and transmits it to a separate 64K signal channel or CPT frame signal channel for transmission to the exchange. Like the interface circuit on the exchange side, the 2.048M data channel interface section 8 is constituted by an elastic buffer.

Accordingly, the present invention constructed and operated as described above is a method in which a telephone interface of a subscriber access / terminal apparatus provides a telephone service using an optical fiber digital transmission network to an analog subscriber line in an optical CATV network. It is possible to provide a telephone service to the subscriber via the B-channel interface in the subscriber access / terminal device, the voice 2-wire signal, that is, a tip / ring signal transmitted and received at the exchange side.

The transmission speed between subscriber access and terminal devices in optical CATV network is 155.52Mb / s, 44.736Mb / s stereo audio channel multiplexed with 44.736Mb / s TV signal channels (TV1, TV2) and 16 stereo audio signals. The 155.52Mb / s signal is multiplexed to transmit the 155.52Mb / s signal, wherein the 155.52Mb / s frame is a 3: 1 simple bit interleaving multiplexing of the signal generated by the 51.84Mb / s frame generation unit, and the 51.8Mb / s frame is 44.736Mb / The frame is generated by inserting an overhead into the s dependent signal to compensate for the speed (a detailed description of this has already been filed by the applicant of the present application as 90-11067 and 90-11068).

The voice telephony service accommodates the primary rate, or 2.048M channel, of the overhead of 51.84 Mb / s frame. In addition, call processing signals of telephones and exchanges must be converted to PCM digital signals through band filters of analog voice signal signals in order to transmit them as analog voice signals. Separate signal channels are used to reproduce call processing signals that do not exist in this band. It can be accommodated in a 64 Mb / s channel of 51.84 Mb / s frame or a signal channel of CEPT frame.

Therefore, in the optical CATV network of the present invention configured and operated as described above, the existing telephone service is accommodated by receiving the line state of the analog voice service telephone and the call processing signal between the subscriber access / terminal devices transmitted at 155.52 Mb / s. It can be applied as it is in the optical CATV network, and it provides the service by accommodating existing analog telephone service in 2.04M channel and 64K signal channel among 51M frames in the optical CATV, so that one subscriber can extend up to 30 lines. Has an effect.

Claims (4)

An interface circuit for processing voice signals transmitted and received with an exchange in an optical CATV connection device in a telephone company or distribution center, comprising: hook on / off reproducing means connected to the exchange side; Subscriber line interface (SLIC) means (23) connected to said hook on / off reproducing means, encoding and decoding (CODEC) means (25) connected to said subscriber line interface means; CEPT framer means (26) coupled to the encoding and decoding means; 2.048M data channel interface means (28) connected to said CEPT framer means and a 51M framer / reframer (3); 64K signal channel interface means (30) connected to said 51M framer / reframer (3); Ring signal detecting means (29) connected to said hook on / off reproducing means and 64K signal channel interface means; Control means (31) connected to said ring signal detecting means and encoding and decoding means; And a CEPT framer and microprocessor interface means (27) connected between said control means and CEPT framer means. 2. The subscriber of an optical CATV as claimed in claim 1, wherein said 2.048M data channel interface means (28) is comprised of an elastic buffer that compensates for the data rate difference between 0.248 data and gapped 2.048M data. Switching side interface circuit between terminals / connections. An interface circuit for processing a voice signal to accommodate an existing subscriber telephone service in an optical CATV terminal device in a subscriber home, comprising: ring signal reproducing means (62) connected to the subscriber telephone; Ring signal generating means (69) connected to said ring signal reproducing means; Hook on / off detecting means (63) connected to said ring signal reproducing means and ring signal generating means; 64K signal channel interface means (70) connected to said ring signal generation means, hook on / off detection means, and 51M leaframer / framer (3 '); Encoding and decoding means (65) connected to said hook on / off detection means; CEPT framer means (66) connected to said encoding and decoding means; 2.048M data channel interface means 68 coupled between the CEPT framer means and a 51M leaframer / framer 3 '; Control means (7) connected to said ring signal generating means; Serial / parallel changing means (72) connected between the encoding and decoding means and the control means; And a framer and microprocessor interface means (67) connected between the CEPT framer means and the control means. 4. The subscriber-side interface circuit between the subscriber station / contact device for optical CATV according to claim 3, characterized in that the 2.048M data channel interface means 68 comprises an elastic buffer capable of compensating for the data rate difference. .