KR20050078057A - Subscriber line distribution uint of broadcasting and communication convergence system - Google Patents

Abstract

According to an aspect of the present invention, there is provided a subscriber line distribution apparatus of a broadcasting communication convergence system, comprising: a working first subscriber line distribution unit (SLU) for communicating broadcast data and Ethernet data connected to an optical line termination (OLT) and a working line; A second SLU for protection, which is connected through a protection line to communicate broadcast data and Ethernet data, and a cross that connects an input / output signal of each of the first and second SLUs to a subscriber by a control signal. And a control unit for outputting the control signal to the switch unit in accordance with a working mode and a protection mode. The crosspoint switch includes an optical transmission unit and an input / output signal of each of the first SLUs according to the control signal according to the working mode. Connecting the input / output signals of the second SLU to the optical transmission unit according to the control signal according to the protection mode. .

Description

Subscriber line distribution device of broadcasting communication convergence system {SUBSCRIBER LINE DISTRIBUTION UINT OF BROADCASTING AND COMMUNICATION CONVERGENCE SYSTEM}

The present invention provides switching of Ethernet packets and MPTS (MPTS Transport), which is a digital broadcast stream, in a transmission system (hereinafter, referred to as a broadcast communication convergence system) that simultaneously provides broadcasting and communication services to subscribers through an optical fiber transmission path. The redundancy structure of the responsible Subscriber Line Distribution Unit (SLU).

The communication transmission system adopts the duplication of equipment and transmission lines in various ways for high level of service and reliability. In general, there are duplication of equipment and duplication of circuits, and accordingly, duplication is implemented through protocols or algorithms suitable for communication networks to cope with failures of specific parts of circuits or networks.

1 and 2, a conventional duplexing scheme employed in a broadcast communication convergence system will be described. In the broadcast communication convergence system, the Optical Line Termination (OLT) 10 transmits broadcast data and communication data to STM-16 and Gigabit Ethernet (G / G) up to 12, 12 'ONU (Optical Network Unit) having a subscriber distribution system. E) Through the interface, the ONU 12 is responsible for switching the broadcast MPTS and Ethernet packets received from the OLT 10 to the subscriber.

First, referring to Figure 1, the broadcast communication convergence system shown in Figure 1 has a structure in which the line between the OLT 10 and the ONU (12, 12 ') is duplicated. Such a structure is the OLT (10) and ONU ( It has two transmission lines between 12 and 12 ', that is, a working line and a protection line, so that a communication line can communicate through the protection line when a problem occurs in the working line. The system can effectively cope with the failure of the working line by duplexing the physical transmission line, and this structure can be solved by using an algorithm suitable for the network, for example, 'Spanning Tree' or 'Rapid Spanning Tree'. By the way, in the case where an abnormality occurs in the ONU 12, the structure remains in a fault state until the ONU 12 is normalized. Example, there is a problem in this part of the case of a particular ONU (12) a fault state, all subscriber 14, which is not receive the service.

The broadcast communication convergence system shown in FIG. 2 has two transmission lines between the OLT 10 and the ONUs 12 and 12 'for a working line and a protection line, and each ONU 12 and 12' is a network switch for working ( 12a, 12a 'and a protection network switch 12b, 12b'. The structure is redundant, so that, for example, in the event of a failure in the transmission line between the OLT 10 and the working network switch 12a, 12a ', Since the OLT 10 communicates through the protection line between the protection network switches 12b and 12b ', the protection network switches 12b and 12b' provide a stable service to the subscribers 14 and 14 'through the protection subscriber line. However, such a structure duplicates the distributed transmission / reception module for the subscriber unit of the ONU 12 and the subscriber line in the case of a fiber to the home (FTTH) system using an optical interface. And, since the subscriber line, and one must introduce an additional equipment for switching the subscriber line, installation cost is increased, and the complex and the structure of the ONU (12) is accompanied by a full-size also increases the problem.

Accordingly, an object of the present invention is to provide a subscriber line distribution apparatus that can have an efficient redundancy structure in a broadcast communication convergence system that should have a high level of service reliability.

In order to achieve the above object, the present invention provides a subscriber line distribution device for a broadcasting line convergence system, wherein a working first subscriber line (SLU) for communicating broadcast data and Ethernet data is connected through an optical line termination (OLT) and a working line. Distribution unit), a second SLU for protection connected to the OLT through a protection line to communicate broadcast data and Ethernet data, and each input / output signal of each of the first and second SLUs by a control signal. And a control unit for outputting the control signal to the switch unit in accordance with a working mode and a protection mode, wherein the crosspoint switch is connected to an optical transmission unit for transmitting to the optical transmission unit. Each input / output signal of one SLU is connected to the optical transmission unit, and is connected to a control signal according to a protection mode. Accordingly, the input and output signals of the second SLU are connected to the optical transmitter.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, specific details such as specific components are shown, which are provided to help a more general understanding of the present invention, and it is understood that these specific details may be changed or changed within the scope of the present invention. It is self-evident to those of ordinary knowledge in Esau.

FIG. 3 is a block diagram of a subscriber line splitter (SLU) in a broadcast communication convergence system. Referring to FIG. 3, a configuration of a subscriber line splitter (SLU) applied to the present invention will be described first. 3 shows an internal block diagram of an SLU that receives 64 MPTS signals and Gigabit Ethernet packets from an OLT. As shown in FIG. 3, the SLU 310 may include a MAC (Media Access Control) controller 311, a signal converter 312, a physical transmitter 313a, 313b, and 313c, an OLT communication unit 314, and Gigabit Ethernet. It is composed of an interface 315, a physical interface 316, an MPTS switching unit 317, a TDM unit 318, and an optical transmission unit 319.

The MPTS switching unit 317 receives 64 MPTS (MPEG Transport Stream) signals and switches them to the TDM (Time Division Multiplexing) unit 318 for output. The TDM unit 318 time-division-multiplexes the MPTS signal output from the MPTS switching unit 317 and the Ethernet signal output from the signal conversion unit 312 and outputs the optical transmission unit 319 composed of small form factor pluggables (SFPs). do. The optical transmitter 319 is an optical transmitter such as an SFP, and is connected to a set top box (STB) on the subscriber side to transmit and receive optical signals. Here, the SFP of the optical transmitter 319 is provided with one transmission port (Tx) and one receiving port (Rx), respectively, and communicate with the subscriber side through these. Accordingly, the optical transmitter 319 transmits the MPTS signal, which is a time division multiplexed broadcast signal, and the fast Ethernet signal, which is a communication signal, to the set-top box of the subscriber side to provide a broadcast service and a communication service together.

The OLT communication unit 314 is connected to the OLT to perform data communication such as the Internet and the OLT through Gigabit Ethernet. Gigabit Ethernet interface 315 provides a Gigabit Ethernet interface between the optical subscriber line splitter 310 and the SLU inside the ONU via differential PECL (Differential PECL). The physical transmitters 313a, 313b, and 313c are connected to the MAC controller 311 and the TBI (Ten bit interface), respectively, and the other side is connected to an optical transmitter such as Gbic (Gigabit Ethernet Converter) of the OLT 314. It is connected to a gigabit Ethernet port for stacking 1 and 2 through an optical transceiver or a gigabit Ethernet interface 315, respectively, and converts an optical signal into an electrical signal and an electrical signal into an optical signal. The physical interface 316 is connected to the MAC controller 311 and transmits a signal transmitted from the SFP of the optical transmitter 319 to the MAC controller 311.

The MAC controller 311 is a controller for controlling the Ethernet medium access control layer. The MAC controller 311 switches input packet data and outputs the packet data to the physical transmitters 313a, 313b, and 313c, the signal converter 312, and the like. The signal conversion unit 312 includes an input serial media identification interface (SMII) and an output parallel media identification interface (PMII), and converts a serially input signal in parallel to the TDM 318.

In FIG. 3, signals A, B, and N are differential PECLs, and MPTS and Ethernet signals are generated by the TDM unit 318 by the TDM method, and signals GS1 and GS2 are output by the physical transmitters 312b and 313c. It is a Gigabit Ethernet signal of differential PECL.

In the present invention, the SLU having the configuration and operation as described above is duplicated to provide a working SLU and a protection SLU. This will be described in more detail with reference to the true drawings. FIG. 4 is a block diagram of an entire subscriber line distribution apparatus in a broadcast communication convergence system according to an embodiment of the present invention, which includes a first SLU 310a for working and a second SLU 310b for protection, and a control signal. Crosspoints for switching the input / output signals (differential PECL signals) of the first and second SLUs 310a and 310b to the optical transmission unit 319 including a plurality of SFPs and the first and second Gigabit Ethernet ports. The control unit 420 includes a cross point switch 410 and a cross point switch 410 through an address and a data bus. The internal configuration of the first and second SLUs 310a and 310b is the same as that of the SLU 310 as shown in FIG. 3, and the first SLU 310a communicates with the OLT through a working line. The second SLU 310b is connected to communicate with the OLT through a protection line.

As described above, the subscriber line distribution apparatus including the SLU having a redundant structure can deal with two kinds of failures. First, in the event of a failure in the working line between the OLT and the ONU, the ONU detects an abnormality in the working line and reports the fault to the OLT to operate the protection line. Accordingly, when the protection line is operated in the OLT, the second SLU 310b for protection as shown in FIG. 4 operates, and the crosspoint switch 410 switches the internal path to the protection path.

Secondly, when a failure occurs in the first SLU 310a for working illustrated in FIG. 4, when the ONU identifies this, the failure is reported to the OLT to operate the protection line. In this case, the OLT operates the protection line, and thus the second SLU 310b for protection operates, and the crosspoint switch 410 switches the internal path to the protection path.

Referring to the drawings, the internal path switching operation of the crosspoint 410 will be described in more detail. FIG. 5 shows the internal path switching state in the working mode of the crosspoint switch 410 and FIG. 6 shows the internal path switching state in the protection mode. As shown in FIG. 5, in the working mode, the crosspoint switch 410 has an input / output signal A, B, N, GS1, GS2 of the first SLU 310a and the respective SFPs under the control of the controller 420. Set up an internal path (ie working path) to connect to G / E ports 1 and 2. When operating in the protection mode in this state, as shown in FIG. 6, the crosspoint switch 410 is under the control of the controller 420, the input / output signals A ′, B ′, N ′ of the second SLU 310b. , GS1 ', GS2') set up an internal path (ie, a protection path) to connect each SFP to G / E ports 1 and 2.

With the above configuration and operation, the present invention provides a protection line and a protection second SLU 310b when an obstacle occurs in the working line between the OLT and the ONU and when an unexpected abnormality occurs in the working first SLU 310a of the ONU. The subscriber distribution network can be used to resume service in a short time.

As described above, the present invention has proposed a duplex method for designing an optical subscriber distribution network in a broadcast communication convergence system which is intended to simultaneously provide broadcasting and communication. This method is the same as the conventional method of duplexing the circuit with the higher end to be duplicated and NE (Network Element) duplication, but in the detailed configuration will have a difference. In other words, the module in charge of the transmission and reception of the subscriber line and the subscriber is a structure configured to operate in the event of a circuit failure and an NE abnormality by duplicating the internal switching block without duplication. In the actual structure, since the first SLU 310a and the second SLU 310b shown in FIG. 4 occupy a relatively small portion in consideration of the cost and the size of the system, the optical subscriber to receive efficient broadcast data and communication data. The distribution network can be designed.

As described above, the configuration and operation of the subscriber line distribution apparatus of the broadcast communication convergence system according to an embodiment of the present invention can be made. Meanwhile, in the above description of the present invention, a specific embodiment has been described. It may be practiced without departing from the scope of the invention. Therefore, the scope of the present invention should not be defined by the described embodiments, but by the claims and equivalents of the claims.

As described above, the subscriber line distribution apparatus of the broadcast communication convergence system according to the present invention may have an efficient redundancy structure in the broadcast communication convergence system that should have a high level of service reliability.

1 is a view showing an embodiment of a redundant structure employed in a conventional broadcast communication convergence system

2 is a view showing another embodiment of a redundant structure employed in a conventional broadcast communication convergence system

3 is a block diagram of a subscriber line splitter in a broadcast communication convergence system

4 is an overall block diagram of a subscriber line distribution apparatus in a broadcast communication convergence system according to an embodiment of the present invention.

5 is a view for explaining an operation in a working mode of the subscriber line distribution apparatus of FIG.

6 is a view for explaining an operation in a protection mode of the subscriber line distribution apparatus of FIG.

Claims (2)

In the subscriber line distribution device of a broadcast communication convergence system, A first subscriber line distribution unit (SLU) for working, which is connected via an optical line termination (OLT) and a working line to communicate broadcast data and Ethernet data; A second SLU for protection connected to the OLT through a protection line to communicate broadcast data and Ethernet data; A switch unit for connecting an input / output signal of each of the first and second SLUs to an optical transmission unit for transmitting to each subscriber by a control signal; And a control unit for outputting the control signal to the switch unit in accordance with a working mode and a protection mode. The control unit of claim 1, wherein the switch unit is a crosspoint switch, and connects each input / output signal of the first SLU with the optical transmission unit according to a control signal according to the working mode, and according to the control signal according to the protection mode. Subscriber line distribution device characterized in that for connecting the input and output signals of the second SLU with the optical transmission unit.