KR100264855B1 - Apparatus for implementing idlc function in the access network - Google Patents

Abstract

PURPOSE: A subscriber transmitter for implementing an IDLC(Integrated Digital Loop Career) function is provided to connect a subscriber transmission equipment with an exchange by using an existing E1 trunk unit. CONSTITUTION: An E1 trunk unit(112) separates an E1 frame received from a host terminal into channel data, and transmits the channel data to corresponding subscriber channel units(111a-111n). The E1 trunk unit(112) formats the received channel data as the E1 frame and transmits the channel data to the host terminal. The subscriber channel units(111a-111n) transmit clean channel data of the received channel data to the E1 trunk unit(112), and transmit signaling channel data of the channel data to a switch(313). The switch(313) transmits signaling channel data extracted by a channel data monitoring and the received signaling channel data to an HDLC(High-level Data Rink Control) controller(314). The switch(313) inserts frame data transmitted to the host terminal into corresponding channels, as an octet unit. The switch(313) transmits frame data transmitted to terminal devices to the corresponding subscriber channel units(111a-111n). The HDLC controller(314) formats the transmitted signaling channel data as a frame, in proportion to an LAPD(Link Access Procedure Direct) protocol and transmits the signaling channel data to the switch(313) again.

Description

Subscriber transmission device to implement IDLC function {APPARATUS FOR IMPLEMENTING IDLC FUNCTION IN THE ACCESS NETWORK}

The present invention relates to a subscriber transmission device of an ISDN (Integrated Service Digital Network), and more particularly, to a subscriber transmission device for implementing an integrated digital loop care (IDLC) function.

In the conventional PSTN network, the equipment has been developed with the priority of voice level service, and in order to implement this, to satisfy the DS1 / (E1) (1,544Mbps, 2,048Mbps) protocol according to the ITU G.703 and G.704 standards. We have focused on the equipment (KD-4, PCM32-T, FLC-A / B).

In addition, a variety of protocols (TCP / IP, HDLC (high-level data rink control)) were used to communicate with the devices (i.e. exchange <-> exchange, transmission equipment <-> transmission equipment). However, it is only a very small amount of additional features (several kbps to tens of kbps) for maintenance.

The E1 frame for the voice service is a channel allocated signaling (CAS) structure using 4-bit abcd (signaling information), and a total of 16 E1s are inserted into a 16th time slot in one multiframe (CRC-4). ) And sent the signaling information of 30 subscribers.

In addition, subscriber's additional 2B + D (narrowband ISDN), 64 * P (P = 1,2 ... 30) data communication services are also transmitted through byte allocation in the CRC-4 multiframe user data area. It did not break out of the CAS structure.

Subscriber-side services require a variety of channel units, such as for voice services (SLC-T), for narrowband ISDN (2B + D), and for data communications (OCUDP). In addition, for connection with the exchange side, various channel units (DPO, DPT, 2W, 4W, SLC-T) are required depending on the type of exchange (analog exchange, inverting exchange, and all-electronic exchange).

Therefore, the number of channel units in the exchange and subscriber transmission equipment is inevitably increased, and the equipment is enlarged accordingly, which causes problems in price competitiveness and difficulty in maintenance.

That is, the current CAS type protocol cannot solve these problems, and a new protocol (ITU-T G.964, G.965 IDLC) requires a more systematic message swtching.

For this purpose, first, an HDLC controller capable of processing and transmitting a large amount of messaged information is required, and in particular, a problem of processing a D channel of ISDN using LAPD protocol is important. In the case of ISDN 2B + D service, the subscriber network terminal (NT) and the switch line (LT) are transmitted in a 3DSO form without any D channel handling in the optical loop device (FLC). . However, the above is a Korean ISDN transmission method, not a transmission method according to the international standard. Therefore, a systematic message transmission method according to the international standard should be used, and the E1 trunk unit is not connected between the subscriber transmission device and the exchange through a channel unit. Through the transmission and reception through the purpose of miniaturization and maintenance of equipment.

Accordingly, an object of the present invention is to provide a subscriber transmission apparatus for implementing an IDLC function in an integrated information communication network (ISDN).

Another object of the present invention is to provide a subscriber transmission apparatus for a V5.2 interface between an exchange and a subscriber.

It is another object of the present invention to provide an apparatus for converting and transmitting various channel units into E1 trunk units.

A host terminal (HTD), which collects various multimedia services from an ATM network and a telephone service from a public telephone network, is connected to the host terminal through a V.5 interface to achieve the above objects, and from the host terminal. A signaling processing unit of a subscriber station (ONU) which converts various communication services according to a copper transmission method and delivers them to a household terminal device, decomposes an E1 frame received from the host terminal and delivers each channel data to a corresponding subscriber channel unit. The E1 trunk unit transmits the received channel data to the host terminal by formatting the received channel data into the E1 frame, and transmits a pure data channel of the channel data received from the indoor terminal to the E1 trunk unit, and the signaling channel data is switched. Multiple subscriber channel units And the signaling channel data extracted by monitoring the channel data transferred from the E1 trunk unit to the subscriber channel unit and the signaling channel data received from the subscriber channel units to the HDLC control processor, and from the HDLC control processor. The frame to be transmitted to the host terminal among the received frame data is inserted into the corresponding channel among the channels transmitted from the subscriber channel unit to the E1 trunk unit in octet units, and the frame data to be transmitted to the terminal device is transmitted to the corresponding subscriber channel unit. And a HDLC control processor for formatting the signaling channel data received from the switching unit into a frame according to a LAPD protocol and transmitting the signal to the switching unit.

1 is a block diagram of a subscriber transmission apparatus according to the prior art.

Figure 2 is a network diagram of the FLCC-C system according to an embodiment of the present invention.

3 is a blur configuration diagram of a subscriber transmission device for implementing an IDLC function according to the present invention;

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 shows the overall network configuration of the FLC-C system according to an embodiment of the present invention.

The FLC-C device is an FTTC (fiber to the curb) ATM technology for providing subscribers with all services such as video service, landline, payphone, ISDN, and leased line (DS1, DS1E) in dense residential areas. It is an optical subscriber transmitter based on this.

As shown in FIG. 2, various services (home shopping, movies, games, karaoke, education, etc.) provided from the ATM network 111 and general telephone services provided from a public switched telephone network (PSTN) 213 are provided through the HDT (exchange 215 of the telephone station 212). Host Digital Terminal (116).

The various services are transmitted to the optical network unit (subscriber transmitter) 218 to which the present invention is applied via the optical fiber (V5.2 interface) 217. In addition, the ONU218 is connected to the STB (settop box) 220 and various terminals in the home through the existing twisted pair 219, and thus the various services are provided to the various terminals.

That is, as described above, the HDT216 and the ONU218 are optically connected, and the transmission is performed by the V5.2 (V5.2) interface. Therefore, the ONU218 must process ISND information coming into the subscriber end according to the V5.2 protocol and transmit it through the optical fiber.

Next, an apparatus for providing the V5.2 interface, that is, implementing an IDLC function will be described in detail with reference to FIG. 3.

The device is a device applied to the ONU218 of FIG. 2, and includes a switching unit 313 for an input / output interface of an ISDN D channel, and an HDLC control processor for processing signaling information channels (D channel information) flowing from the switching unit 313. It consists of 314. The HDLC control processor 315 is implemented using an existing chip, and the signaling information is processed and transmitted using a LAPD protocol.

First, referring to a process of transmitting data flowing from a subscriber end through an E1 trunk, the pure data of the N subscriber channel units 111a through 111n input from the subscriber end is directly transmitted through the transmission line 317. 112, the signaling channel is transmitted to the switching unit 313 through the transmission line 318. The D channel (signaling channel) information input to the switching unit 313 is subjected to data processing through the HDLC control processing unit 314, and is then framed and input to the switching unit 313. Under the operation of the switching unit 313, the frame data is inserted into the corresponding channel (the corresponding E1 timeslot) in octet units and transmitted to the E1 trunk unit.

On the other hand, referring to the process of transferring the ISDN information transmitted from the exchange (exactly, HDT216 as an example) to the E1 trunk unit 112 to the subscriber channel unit 111, the pure data channel information of the E1 trunk unit 112 is received as it is. The channel information is transmitted to the subscriber channel unit 111 through the signaling channel (D channel) information extracted by the monitoring unit 219 of the switching unit 131 and input to the switching unit 313. The extracted signaling information is subjected to data processing through the HDLC control processor 314, and is again framed and input to the switching unit 313. The frame data is transmitted to the subscriber channel unit 111 through the receiving line 316 under the operation of the switching unit 313.

That is, the HDLC control processor requires a switching block for an input / output interface, a 32-bit u-processor for high-speed processing, and a large amount of memory.

In the case of transmission, the signaling information line coming from the channel unit is monitored and the D channel of the ISDN flowing in at a constant timing is received through a switching chip, reconfigured, and inserted into a desired E1 time slot.

The reception proceeds in the opposite way. First, the HDLC control processor monitors the E1 line and, if a message is detected, processes it in a form acceptable to the channel unit and retransmits it at the appropriate timing.

As described above, the present invention can implement structured message informatization by implementing IDLC function in subscriber transmission device, and by minimizing equipment and reducing cost by connecting subscriber transmission equipment and exchange period using existing E1 trunk unit. It can increase price competitiveness and ease maintenance.

Claims (1)

A host terminal (HTD), which collects various multimedia services from an ATM network, a telephone service from a public telephone network, is connected to the host terminal through a V.5 interface, and transmits various communication services from the host terminal. In the signaling processing device of the subscriber station (ONU) for converting according to the method and delivered to the household terminal device, An E1 trunk unit for decomposing an E1 frame received from the host terminal to deliver each channel data to a corresponding subscriber channel unit, formatting the received channel data into an E1 frame, and transmitting the received channel data to the host terminal; A plurality of subscriber channel units for transmitting a pure data channel of the channel data received from the indoor terminal device to the E1 trunk unit and a signaling channel data to a switching unit; The signaling channel data received by monitoring the channel data transferred from the E1 trunk unit to the subscriber channel unit and the signaling channel data received from the subscriber channel units are transferred to the HDLC control processor, and the frame is transmitted from the HDLC control processor. The switching unit for inserting the frame to be transmitted to the host terminal of the data in the octet unit of the channel transmitted from the subscriber channel unit to the E1 trunk unit, and the frame data to be transmitted to the terminal device to the subscriber channel unit Wow, And the HDLC control processor for formatting the signaling channel data received from the switching unit into a frame according to a LAPD protocol and transmitting the signaling channel data to the switching unit.

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