KR19990026690A - How to handle the ISDN channel of the subscriber network - Google Patents

Abstract

end. TECHNICAL FIELD OF THE INVENTION

A method for processing an ISDN D channel in a subscriber network.

I. Technical Problems to be Solved by the Invention

We present software that effectively handles ISDN D channel in V5.2 interface of subscriber network.

All. The point of the solution of the invention

The ISDN D channel processing method in the V5.2 interface of the subscriber network is classified into one processing function by integrating the mapping function and the frame relay function on the V5.2 protocol stack.

la. Important Uses of the Invention

It is used for the ISDN D channel processing of the subscriber network.

Description

How to handle the ISDN channel of the subscriber network

The present invention relates to a data processing method in a V5.2 interface of a subscriber network, and more particularly, to an ISDN (Dedicated Channel) processing method for an ISDN (Integrated Services Digital Network).

In the case of telephone and data transmission to existing exchanges and subscribers, the signaling method uses a CAS (Chnnel Association Signaling) method. The CAS scheme is a scheme of transmitting 16 bits of a 64kbps channel out of 2,048Mbps (E1 scheme: 32 channels) as a signaling channel, and extracting 8 bits (ABCDA'B'C'D ') of the channel using AB and A'B 'Bit to transmit information such as a subscriber's hook on / off and make busy. At this time, the general voice service and the ISDN service are transmitted through the remaining 30 channels excluding the 0th multiframe information channel and the 16th signaling information channel among the 2,408Mbps transmission frames.

However, the ISDN basic rate service (2B + D) uses two voice or data service channels (2B) and one signaling channel (D) And is continuously allocated and transmitted such as a channel for data service. In other words, when one ISDN 2B + D subscriber service is provided, three channels are always occupied.

Therefore, in the case of providing the ISDN 2B + D basic rate service in the above-described manner, regardless of whether the subscriber uses two B channels, regardless of whether or not the signaling information using the D channel exists, the three channels are unconditionally occupied . This causes inefficiency and high cost of service between exchange and subscriber.

However, unlike the existing CAS method, the V5.2 protocol can be used not only as the 16th channel but also as the 15th and 31st channels selectively. Also, the V5.2 protocol is not limited to information transmission using bit combinations, It is a message transmission method that constructs a frame with a combination of octets and transmits information.

In the case of ISDN 2B + D basic rate service using the above method, one or two B channels to be used by the subscriber can be used according to the protocol procedure. In case of the D channel, depending on the usage, It is possible to flexibly occupy the signaling channel according to the type of the D channel.

Accordingly, an object of the present invention is to provide a method for effectively transmitting D channel information using a V5.2 protocol when providing an ISDN service.

A method for processing an SDH channel of a subscriber network for achieving the above object comprises the steps of: receiving a frame from the SDH user and removing a start flag, an FCS, and an end flag; The method comprising the steps of: inputting a user port address and copying an HSDPA (1) frame into a data field; mapping the ISDN user port address to an envelope address; determining which signaling channel (1) frame in which an envelope address is inserted in the message data field; and a step of copying the HSDPA frame into the message frame 1, the start flag, the FF, and the end flag The process of the castle, and the frame characterized constituted by any process of transmitting a signaling channel corresponding to the signaling channel number.

1 is a network construction diagram of an FLC-C according to the present invention;

Figure 2 is a functional block diagram of a V5.2 protocol stack according to the International Recommendation.

3 is a functional block diagram for processing ISDN D channel information according to the present invention.

4 is a flowchart illustrating an operation for processing ISDN D channel information according to the present invention;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

FIG. 1 shows a network configuration diagram of an FLC-C system to which the present invention is applied.

The FLC-C device includes a fiber to the curb (FTTC) ATM technology for providing a subscriber with all services such as a video service, a public telephone, a public telephone, an ISDN and a dedicated line (DS1 and DS1E) Based optical transmission system.

1, various services (home shopping, movies, games, karaoke, education, etc.) provided from the ATM network 111 and a general telephone service provided from a public switched telephone network (PSTN) 113 are transmitted to the HDT Host Digital Terminal < / RTI >

The various services are transmitted to an ONU (Optical Network Unit) 118 to which the present invention is applied through a light path (V5.2 interface) 117. Also, the ONU 118 is connected to an STB (settop box) 120 and various terminals through a conventional twist pair 119, and the various services are provided to the various terminals.

That is, as described above, the HDT 116 and the ONU 118 are connected by an optical line, and the transmission is performed by a V5.2 interface. Therefore, the ONU 118 must process the ISND information coming into the subscriber terminal according to the V5.2 protocol and transmit it through the optical line.

Here, the stack structure of V5.2 according to the International Recommendation (ITU-T) will be described with reference to FIG. The present invention relates to D-channel information processing during ISDN information processing, and the following description only relates to D-channel information processing.

The V5.2 protocol consists of three layers, and the D channel information of the ISDN service information received from the subscriber terminal is transmitted to the exchange through the V5.2 interface only through the layer 1 and the layer 2.

In addition, the D channel information does not pass through all sub-layers like the other signaling information in the layer 2 but only through the frame relay unit 211 and the envelope unit 214. [

A functional block diagram and a flowchart for more effectively implementing the V5.2 processing layer based on the above-mentioned recommendation will be described in detail with reference to the accompanying drawings.

The present invention also proposes software for faster processing of V5.2 protocol processing according to the above international recommendations.

3 is a functional block diagram of an ISDN D information channel processing according to an embodiment of the present invention.

4 is an operational flow diagram for processing an ISDN D information channel in accordance with an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 3 and 4. FIG.

Among the service information (B channel information) and signaling data (D channel information) coming from the ISDN subscriber terminal 311, the B channel information is transparently transmitted through the service information channel of 2,048 Mbps frame. However, the D channel information as the signaling data is V5 .2 protocol through the V5.2 interface over the processing layer.

The D-channel information is firstly passed through a High-level Data Link Control (HDLC) 312 of a layer 1. In the HDLC, a start flag, an end flag, and an FCS (Frame Check Sequence) octet, and only the information frames there between are transmitted to the layer 2 through the message. This is the description of step 415 of FIG.

Here, the D channel information frame is as follows.

OPEN FLAG ... FCS CLOSING FLAG

In the layer 2, the information received from the layer 1 is checked, it is judged from which subscriber it is, and the ISDN subscriber port address is inputted into a message header field. In the message data field, . The above description is from step 415 to step 417 of FIG.

The ISDN subscriber port address is converted into an envelope address and inserted into the information frame to perform a mapping function. This is the description of step 419 of FIG.

Determines which signaling channel the information frame is to be transmitted over, and inputs the determined signaling channel number into the message header field. The above description is from step 421 to step 423 of FIG.

In the layer 1, the HDLC (2) receives the frame from the HDLC (1), and the start flag, the end flag, and the FCS octet And transmits it to the signaling channel of the corresponding 2,048 Mbps frame to be transmitted to the ONU 118 through the V5.2 interface. The above description is from step 425 to step 429 of FIG.

In other words, the mapping function and the frame relay function on the V5.2 protocol stack according to the international recommendation are integrated and classified into one ISDN D channel function. In this case, by using a part of the frame relay function and a part of the envelope function, And the processing speed was increased.

As described above, the present invention classifies the ISDN D processing method in the V5.2 interface of the subscriber network into one ISDN D channel function by integrating the mapping function and the frame relay function on the V5.2 protocol stack. At this time, a part of the frame relay function and a part of the envelope are processed by hardware using a commercial chip to increase the processing speed.

Claims (1)

A method of processing an ISDN channel of a subscriber network, Transmitting only the information frame from the HDDS 1 to the layer 2 from which the start flag, the FPSS, and the end flag are removed; Confirming the information frame, inputting the ISDN user port address into a message header field, and copying an HSDPA frame into a data field, Mapping the ISDN user port address to an envelope address; Determining a signaling channel to which the frame is to be transmitted and inputting the determined signaling channel number into the message header field; (1) frame in which the envelope address is inserted in the message data field, and transmitting the copied frame to the layer 1; Generating a start flag, an end signal, and an end flag from the frame; And transmitting the frame through a signaling channel corresponding to the signaling channel number.