KR960013982B1 - Subscriber interface & method for narrow-band isdn in catv network - Google Patents

Abstract

The device includes a CPU(25) for performing operation and maintenance service of narrow band ISDN, analyzing and generating a C/I code, detecting and displaying an alarm of LOS and LOF, a frame arraying means(21) for providing 155M multiplex device(14) with 2B+D Cv1 channel information of monitor(4), a Cv1 controlling means(23) for analyzing data to the frame arraying means(21), a PCM controlling means(22) for generating interruption signal, and S binding means(24) for binding a signal transmission.

Description

Subscriber access device for narrowband Integrated Information Network (ISDN) and control method in CATV network

1 is a configuration diagram of an optical CATV network to which the present invention is applied;

2 is a block diagram of a narrowband ISDN subscriber access unit according to the present invention;

3 is a frame diagram of a narrowband ISDN subscriber access unit,

4 is a flowchart of a control method according to the present invention;

5 is a detailed flowchart of the Cv1 controller interrupt service routine;

6 is a detailed processing flowchart of the PCM control interrupt service routine.

* Explanation of symbols for the main parts of the drawings

21: PCM frame alignment unit 22: PCM control unit

23: Cv1 control unit 24: S matching unit

25: CPU

The present invention relates to a subscriber access device for implementing a narrowband ISDN service in an optical CATV network, and a control method thereof.

In providing a conventional narrowband ISDN service, when a user (U) connection interface is provided to a subscriber using an existing telephone line through a PMUX line terminal (LT) in a distribution center, the subscriber to the subscriber station (NTE) S) A connection interface was provided.

However, such a conventional method has a problem in that a process and a configuration of a device are complicated because a user access interface process is performed.

In addition, only one 2B + D channel can be provided to one subscriber through one line, thereby reducing communication efficiency.

Accordingly, the present invention has been made to solve the problems of the prior art, the subscriber access device to simplify the transmission path by providing data to the subscriber via the optical fiber in the distribution center and direct subscriber access interface at the narrowband subscriber access unit And a control method thereof.

Another object of the present invention is to provide a subscriber access device and control method for providing narrowband ISDN basic access of up to seven channels.

In order to achieve the above object, the access device according to the present invention performs the operation and maintenance of the narrowband ISDN of the terminal side by outputting the Cv1 channel information next, and the operation and maintenance of the narrowband ISDN of the exchange side from the terminal side. C / I code is analyzed and outputted when receiving C / I code, and LOS (Loss of Synchonization) and LOF (Los of of Frame) for 2.048Mb / s frame itself through frame arrangement / maintenance signal (Cv4 channel). The central processing unit (hereinafter referred to as CPU) that detects and displays alarms from the system, receives clocks provided by 155M multiple devices, 2B + D and Cv1 channels of 2.048Mb / s frame, and transmits them to the subscriber station. 2B + D and Frame aligning means for providing Cv1 channel information to the 155M multiple devices and Cv1 channel information output from the frame aligning means to generate an interrupt to the CPU to be analyzed by the CPU. Cv1 control means for transmitting and converting the C / I code analysis result value from the terminal side analyzed by the CPU to the Cv1 channel and transferring the Cv1 channel to the frame alignment means 21, and analyzing the Cv1 channel information from the CPU. Converts the result value into 2 bits of C / I (Command / Indication) code and transmits it to the terminal, and generates an interrupt to the CPU when receiving the C / I code for operation and maintenance of narrowband ISDN from the terminal side. And S matching means for matching signal transmission between the PCM control means and the terminal.

In addition, the control method according to the present invention is applied to the above connection apparatus, the first step of initializing the PCM frame alignment means, PCM control means, Cv1 control means, S matching means, Cv1 control means and PCM control A second step of checking whether an interrupt has occurred in the means, and if the interrupt occurs, performing the corresponding interrupt service routine when the interrupt has occurred, and returning to the second step; A third step of checking whether an alarm has occurred and detecting a Loss of Synchronization (LOS) and a Loss of Frame (LOF) alarm for the 2.048 Mb / s frame itself through the Cv4 channel of time slot 0 if the alarm has occurred. A fourth step of displaying and returning to the second step and immediately returning to the second step if an alarm has not occurred is performed.

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

1 is a configuration diagram of an optical CATV network to which the present invention is applied, in which 1 is a central station, 2 is a distribution center, 3 is a subscriber access device, and 4 is a terminal.

In the central station 1 of the optical CATV network, the V4 signal (see FIG. 3) interfaced with the switch 11 is transmitted to the distribution center 2 through the channel multiple matching and 600M transmission device 12, and the 2B + D mapper section ( 13, 2B + D + Cv1 channel of one subscriber is mapped to a 2.048 Mb / s frame (see FIG. 3) and transmitted to the subscriber access device 3 through the 155M multiplexer 14. The narrowband ISDN connection 15 in the subscriber access device 3 provides the S connection interface to the terminal 4.

2 is a configuration diagram of the narrowband ISDN access unit 32 of the present invention, in which 21 is a PCM frame alignment unit, 22 is a PCM control unit, 23 is a Cv1 control unit, 24 is an S matching unit, and 25 is a CPU.

As shown in the drawing, the narrowband ISDN access unit of the present invention matches the 2B + D channel transparently transmitted through the 155M multiplexer 14 and the Cv1 channel for operation and maintenance with the terminal in the subscriber. PCM frame alignment unit 21 connected to the 155M multiple devices, PAM control unit 22 connected to the PCM frame alignment unit 21, S matching unit connected to the PCM control unit 22 and connected to the subscriber terminal ( 24, the Cv1 control unit 23 connected to the PCM frame alignment unit 21, the PCM control unit 22, and the S matching unit 24, and the PCM frame alignment unit 21, the PCM control unit 22, and S. The CPU 25 is connected to the matching unit 24 and the Cv1 control unit 23.

The PCM frame aligner 21 transmits the B1, B2, D, Cv1 channel and frame arrangement / maintenance signals transparently transmitted from the exchange 11 to each subscriber via the 155M multiplexer 14 of the subscriber interface 3. Receives an NRZ signal (as shown in FIG. 3) of a 2.048 Mb / s frame, and uses a clock that receives 4.096 MHz from a synchronization circuit in the 155 M multiplexer 14.

3 shows the configuration of a 2.048 Mb / s frame, where time slot 0 is used for synchronization and maintenance signals in accordance with CCITT Recommendation G.704, and the 2.048 Mb / s frame is matched to the narrowband subscriber interface 15. 2B + D channels of one subscription and C (v1) channels for maintenance of basic access are included. In the figure, B1 and B2 of timeslot 1 represent basic access B1 and B2 channels, D represents basic access D channel, and Cv1 represents basic access Cv1 channel.

Basic access related maintenance information is transmitted in a modified HDLC form between the Cv1 control unit 23 and the exchange 11 via the Cv1 channel of FIG.

The Cv1 controller 23 is implemented as a 2-bit HDLC controller and has functions such as flag generation and detection, minimum length check, CRC generation and check, and 32 bits each have a transmit and receive buffer.

The Cv1 control unit 23 reads and analyzes the Cv1 channel transmitted through the exchange 11, and then controls it downward to convert to the C / I code through the PCM control unit 22, and Cv1 irrelevant to S matching is switched upward. And perform the request / response.

The PCM control unit 22 is connected between the PCM frame alignment unit 21 and the S matching unit 24, reads and analyzes the C / I code from the S 24, and then transfers the value to the exchange 11 to the Cv1 control unit. Through 23, it is converted to Cv1 and controlled upward, and the value not to be transmitted is controlled downward. The 2B + D channel is exchanged between the 155M multiple device 14 and the terminal 4 and the terminal 4 by the PCM frame alignment unit 21, the PCM control unit 22, and the S matching unit 24.

Looking at the overall operation of the present invention narrowband ISDN subscriber access unit 15 as follows.

The PCM frame aligner 21 receives the 2B + D and Cv1 channels of the 2.048 Mb / s frame of FIG. 3 via the 155M multiplexer 14, and transmits the 2B + D signals to the PCM controller 22 transparently, and the Cv1 channel is Cv1. It transmits to the control part 23. In addition, an alarm of LOS (Loss of Synchronization) and LOF (Loss Of Frame) of the 2.048 Mb / s frame itself is detected and displayed through the frame arrangement / maintenance signal (Cv4 channel) of time slot 0 in FIG. . The 2B + D signal is transparently transmitted to the terminal 4 through the PCM control unit 22 and the S matching unit 24, and conversely, the 2B + D signal from the terminal 4 is transferred to the S matching unit 24 and the PCM control unit 22. ), And is transmitted to the 155M multiple device 14 through the PCM frame alignment unit 21.

The Cv1 channel of FIG. 3 for the operation and maintenance of the narrowband ISDN (2B + D channel) is transmitted in HDLC form to the CPU 25 via the Cv1 control unit 23, where the Cv1 channel is received from the 155M multiplexer 14. When the interrupt is generated to the CPU 25, the Cv1 controller interrupt service routine analyzes the Cv1 value, and then converts it into 2 bits of the C / I (Command / Indication) code through the PCM controller 22. It performs the operation and maintenance of the narrowband ISDN on the downstream side by transmitting to. In addition, the C / I code for the operation and maintenance of the narrowband ISDN upstream from the terminal 4 is transmitted to the PCM control unit 22 through the S matching unit 24, the CPU 25 in the PCM control unit 22 C / I code is analyzed by the PCM controller interrupt service routine, converted to Cv1 channel through the Cv1 controller 23, and then transmitted to the 155M multi-device 14 through the PCM frame alignment unit 21. Done.

4 is a flowchart of a subscriber matching method according to the present invention.

First, the PCM frame alignment unit 21, the PCM control unit 22, the Cv1 control unit 23, and the S matching unit 24 are initialized to allow each device to perform its function. Then, the Cv1 controller 23 and the PCM controller 22 check whether the interrupt has occurred (32), and if so, perform the Cv1 controller interrupt service routine or the PCM controller service routine (35 to 38), and Cv1. When there is no interrupt in the controller 23 and the PCM controller 22, a Loss of Synchromization (LOS) and Loss Of Frame (LOF) alarm is detected for the 2.048 Mb / s frame itself through the Cv4 channel of time slot 0. (33, 34).

When the display of the warning is finished and the interrupt service execution routine ends, the process returns to step 32 to check for interrupt occurrence.

5 is a detailed flowchart of the Cv1 controller interrupt service routine.

In the Cv1 control unit 23 interrupt service routine, the Cv1 data is inputted through the Cv1 control unit 23 through the 155M multi-device 14 to analyze the Cv1 channel (42), and then interpret the contents to determine the PCM control unit ( 22) to convert to the C / I code, to control the terminal 4 via the S matching unit 24.

First, the CPU 25 receives the C / I code from the terminal 4 via the S matching unit 24 and the PCM control unit 22 with the interrupt generated by the PCM control unit 22. The C / I code is analyzed (52), and it is checked whether to transmit to the exchange (53). If the result of the investigation is to be transmitted to the exchange side, the Cv1 control unit 23 transmits and returns to the exchange 11, otherwise the PCM control unit 22 transmits and returns to the subscriber station 4 (54).

Accordingly, the present invention, which is configured and operated as described above, simplifies the transmission path by providing data to a subscriber through an optical fiber in a distribution center and a direct subscriber access interface at a narrowband subscriber connection, and narrowband of up to seven channels. It has the effect of providing ISDN basic access.

Claims (6)

Cv1 channel information is analyzed and then outputted to perform the operation and maintenance of the narrowband ISDN on the terminal 4 side, and C for the operation and maintenance of the narrowband ISDN on the exchange 11 side from the terminal 4 side. C / I code is analyzed and output when receiving / I code, and alarm of Loss of Synchronization (LOS) and Loss Of Frame (LOF) for 2.048Mb / s frame itself through frame arrangement / maintenance signal (Cv4 channel) The central processing unit (hereinafter referred to as a CPU) for detecting and displaying a signal, a clock provided by the 155M multiple device 14, and 2B + D and Cv1 channels of 2.048 Mb / s frame are received and transmitted to the subscriber station. 4) the 2B + D Cv1 channel information is inputted to the 155M multiplexer 14 and receives frame alignment means 21 and Cv1 channel information output from the frame alignment means 21, and is interrupted to the CPU 25. Is generated and transmitted for analysis in CPU 25, and minutes in the CPU 25 are generated. Cv1 control means 23 for converting the C / I code analysis result value from the terminal to the Cv1 channel and transferring the C / I code analysis result value to the Cv1 channel, and the Cv1 channel information from the CPU 25. Is converted into 2 bits of a command / indication (C / I) code and transmitted to the terminal 4 side, and the CPU receives the C / I code for the operation and maintenance of the narrowband ISDN of the upstream side from the terminal 4 side. PCM control means 22 for generating an interrupt at 25 and providing S matching means 24 for matching signal transmission between the PCM control means 22 and the terminal 4; Subscriber access device for narrowband Integrated Information Network (ISDN). 2. The subscriber access device for a narrowband integrated information communication network (ISDN) according to claim 1, wherein said frame alignment means (21) is configured to receive and distribute 4.096 MHz from a 155M multiple device (14). The subscriber access device for narrowband integrated information communication network (ISDN) according to claim 1, wherein the Cv1 control means (23) is configured to transmit Cv1 channel information to the CPU (25) in the form of HDLC. Subscriber connection for narrowband integrated information communication network (ISDN) equipped with CPU 25, frame alignment means 21, Cv1 control means 23, PCM control means 22, and S matching means 24 A subscriber access control method applied to a device, comprising: a first step of initializing the PCM frame alignment means (21), the PCM control means (22), the Cv1 control means (234), and the S matching means (24); After performing step 1, the second step of checking whether an interrupt has occurred in the Cv1 control means 23 and the PCM control means 22, and if the interrupt occurs, checks the corresponding interrupt service routine. And returning to the second step, and checking whether an alarm on the trunk has occurred when an interrupt has not occurred, and if the alarm has occurred, through the Cv4 channel of time slot 0 Loss of Synchronization (LOS), and LO for 2.048 Mb / s frame itself A narrowband Integrated Information Network (ISDN), comprising: detecting and displaying an F (Loss Of Frame) alert, returning to the second stage, and immediately returning to the second stage if the alert does not occur. Subscriber access control method). 5. The Cv1 control means 23 interrupt processing of the third step comprises inputting Cv1 data through the Cv1 control means 23 through the 155M multiplexer 14 to analyze the Cv1 channel. And, after performing the Cv1 channel analysis step, analyzing the analysis result and converting the result into a C / I code through the PCM control means 22 to control the terminal 4 through the S matching means 24. Subscriber access control method for narrowband integrated information communication network (ISDN), characterized in that performed by. 5. The PCM control means 23 interrupt processing in the third step is performed by the S matching means 24 and the PCM control means 22 from the terminal 4 with an interrupt generated by the PCM control means 22. After receiving and analyzing the C / I code through the step of determining the transmission direction, and as a result of the determination of the step, if the transmission to the exchange side transmits to the exchange 11 through the Cv1 control means 23 and returns otherwise And transmitting and returning to the subscriber station (4) via the PCM control means (22).