JP4301025B2 - Communication terminal and registration processing method for a plurality of optical subscriber line terminating devices - Google Patents

Description

  The present invention relates to a PON (Passive Optical Network), which is a medium-shared communication in which a plurality of home-side devices share a medium and transmit data, and in particular, a plurality of optical subscriber line terminators (hereinafter referred to as ONUs). )) And a registration processing method thereof.

  In recent years, the Internet has become widespread, and users can access various information on sites operated in various parts of the world and obtain the information. Along with this, the demand for broadband access such as ADSL (Asymmetric Digital Subscriber Line) and FTTH (Fiber To The Home) is also increasing rapidly. Related technologies include “IDG Information Communication Series FTTH Textbook” (p158-p159, ISBN4-87280-493-7) and “Standardization Trends in IEEE802.3ah and Challenges in System Construction” (Ken Murakami et al., Electronic Information There are prior arts disclosed in IEICE, IEICE Techniques, IN2003-24, 2003-06).

  In these prior arts, a registration process (Discovery Processing) defined in IEEE 802.3ah is described, and a logical link identifier (LLID) of an ONU by an optical subscriber line terminal device (hereinafter referred to as OLT). Is disclosed.

  FIG. 5 is a diagram for explaining the procedure of the registration process in the conventional G-EPON (Giga-Ethernet® PON) system. The station side apparatus periodically transmits a registration inquiry packet to the ONU in order to register the unregistered ONU (S11). The registration inquiry packet is transmitted to all ONUs. When the ONU is unregistered, the station side device cannot specify the ONU packet transmission timing. Therefore, each ONU generates a random number internally after receiving the registration inquiry packet from the station side device, and transmits a registration request packet to the station side device after a lapse of time corresponding to the random number (S12).

  When the station side apparatus receives the registration request packet from the ONU, the ONU is specified by the transmission source (SA) address of the registration request packet. A MAC (Media Access Control) address is assigned to each ONU in advance, and the station side device specifies the ONU based on the MAC address included in the registration request packet received from the ONU.

  Next, the station side apparatus determines the LLID to be assigned to the ONU, transmits a registration packet to the ONU, and notifies the LLID (S13). The ONU determines whether or not it is addressed to its own ONU from the destination address of the registration packet, and if it is addressed to its own ONU, the LLID is acquired to change from the unregistered state to the registered state.

The ONU that has transitioned to the registration state transmits a registration ACK packet to the station side device, and notifies that the registration process has been completed (S14). Since the registration process is performed in this way, when a plurality of ONUs are connected to the station side device, it is necessary to assign a unique MAC address to each ONU.
IDG Information Communication Series FTTH Textbook (p158-p159, ISBN4-87280-493-7) Standardization trends and system construction issues in IEEE 802.3ah (Ken Murakami et al., IEICE, IEICE, IN2003-24, 2003-06)

  In the registration process described above, the ONU is specified by the destination address (DA) stored in the registration packet, so that a plurality of ONUs cannot use the same MAC address. Therefore, when one communication terminal has a plurality of ONUs, it is necessary to assign a MAC address to each ONU. However, the MAC addresses are limited, and it is preferable to reduce the number of MAC addresses to be used as much as possible.

  The present invention has been made to solve the above problems, and a first object thereof is a communication terminal capable of reducing the number of MAC addresses of a communication terminal in which a plurality of ONUs are mounted, and a registration processing method thereof. Is to provide.

  The second object is to provide a communication terminal capable of reducing the total cost of the system.

According to one aspect of the present invention, there is provided a communication terminal in which a plurality of optical subscriber line terminating devices are mounted, a conversion means for converting an optical signal from the outside into an electric signal, and an electric power converted by the conversion means extracting a registration inquiry packet from a signal, one of a plurality of optical network device viewed contains a control means for controlling to perform a registration process to the registration inquiry packet, a plurality of optical network The private line termination device individually executes the registration process using the same MAC address .

  Preferably, the converting means converts an optical signal from the outside into an electric signal, outputs the electric signal to a plurality of optical subscriber line terminators and a control means, and calculates an electric signal from the plurality of optical subscriber line terminators. , Converted into an optical signal and output to the outside.

  Preferably, the control means extracts the registration inquiry packet from the electrical signal converted by the conversion means, and enables the registration inquiry packet to be transmitted by one of the plurality of optical subscriber line terminating devices in response to the registration inquiry packet. And transmission of registration request packets by other optical subscriber line terminating devices is invalidated.

According to another aspect of the present invention, there is provided a registration processing method for a plurality of optical subscriber line terminating devices, the step of extracting a registration inquiry packet from externally received packets, and the extracted registration inquiry packet On the other hand, the step of controlling one of the plurality of optical subscriber line termination devices to execute the registration process, and the plurality of optical subscriber line termination devices individually execute the registration process using the same MAC address. Including the step of .

  According to an aspect of the present invention, the control means extracts a registration inquiry packet from the electrical signal converted by the conversion means, and one of the plurality of optical subscriber line termination devices responds to the registration inquiry packet. Therefore, it is only necessary to assign one MAC address to a plurality of optical subscriber line termination devices, and the number of MAC addresses assigned to the plurality of optical subscriber line termination devices can be reduced. It became.

  Further, the conversion means converts an optical signal from the outside into an electrical signal and outputs the electrical signal to a plurality of optical subscriber line terminators and a control means, and after calculating the electrical signals from the plurality of optical subscriber line terminators, Since it is converted into an optical signal and output to the outside, it is only necessary to provide one conversion means for a plurality of optical subscriber line terminating devices, and the total cost of the system can be reduced.

  Further, the control means extracts the registration inquiry packet from the electrical signal converted by the conversion means, and validates the transmission of the registration request packet by one of the plurality of optical subscriber line terminating devices for the registration inquiry packet. Since the transmission of registration request packets by other optical subscriber line terminators is invalidated, it becomes possible to easily control the registration processing of a plurality of optical subscriber line terminators.

  FIG. 1 is a diagram showing a connection example of communication terminals in the embodiment of the present invention. This communication system mainly includes a station side device (OLT) 1 installed in a telephone station or the like, an optical coupler 2, a plurality of communication terminals 3, and a plurality of personal computers (PCs) connected to the respective communication terminals 3. 4).

  The station-side device 1 and the optical coupler 2 are connected by a single optical fiber, and the optical coupler 2 and each communication terminal 3 are connected by a single optical fiber. When transmitting a packet from the station side device 1 to the communication terminal 3, the optical coupler 2 distributes the optical signal from the station side device 1 and sends the optical signal to all the communication terminals 3. Further, when transmitting a packet from the communication terminal 3 to the station side device 1, a plurality of communication terminals 3 share one optical fiber between the station side device 1 and the optical coupler 2, and therefore one unit at a certain time. Only the communication terminal 3 can transmit a packet.

  If transmission packets from a plurality of communication terminals 3 collide on the optical fiber between the station side apparatus 1 and the optical coupler 2, the packet becomes invalid data due to the collision, and the station side apparatus 1 receives the packet. become unable. In order to prevent such packet collision, IEEE 802.3ah is examining a communication procedure in which each communication terminal 3 performs time-division transmission based on the transmittable time designated by the station-side device 1.

  FIG. 2 is a block diagram showing a schematic configuration of the communication terminal 3 in the embodiment of the present invention. The communication terminal 3 includes an optical IF (Interface) 31 connected to the optical coupler 2 via an optical fiber, a plurality of ONUs 32, and a registration processing control unit 33 that controls registration processing of the plurality of ONUs 32. Each of the ONUs 32 is connected to the PC 4.

  When the optical IF 31 receives an optical signal from the station-side device 1 via the optical coupler 2, the optical IF 31 converts the optical signal into an electrical signal and outputs the electrical signal to the plurality of ONUs 32 and the registration processing control unit 33. Further, when the optical IF 31 receives a packet to be transmitted from the ONU 32 to the station apparatus 1, the optical IF 31 converts the electrical signal into an optical signal and outputs the optical signal to the optical coupler 2. The optical IF 31 performs an OR operation on the electrical signals received from the plurality of ONUs 32, converts the electrical signals into optical signals, and outputs the optical signals to the station apparatus 1.

  FIG. 3 is a block diagram showing an internal configuration of the ONU 32 shown in FIG. The ONU 32 includes a reception processing unit 34 that receives a reception packet from the optical IF 31, a transmission processing unit 35 that transfers the transmission packet to the optical IF 31, a registration processing unit 36 that performs registration processing under the control of the registration processing control unit 33, and a reception A packet buffer 37 that temporarily stores packets and transmission packets, a PCIF transmission processing unit 38 that performs transmission processing of packets to the PC 4, and a PCIF reception processing unit 39 that performs reception processing of packets from the PC 4 are included.

  The reception processing unit 34 extracts a packet addressed to its own ONU from the received packets received from the optical IF 31. If the packet is a packet related to the registration process (hereinafter referred to as a registration process packet), the registration process packet is transferred to the registration processing unit 36. If the packet is addressed to another PC 4, the packet is transferred to the packet buffer 37.

  The transmission processing unit 35 transfers the packet transferred from the registration processing unit 36 or the packet buffer 37 to the optical IF 31.

  When the registration processing unit 36 receives the registration processing packet from the reception processing unit 34, it is determined whether or not its ONU is in an unregistered state and the registration request packet transmission signal output from the registration processing control unit 33 is valid. Determine.

  If the own ONU is unregistered and the registration request packet transmission signal is valid, the registration processing unit 36 generates a registration request packet for the registration inquiry packet and transfers it to the optical IF 31 via the transmission processing unit 35. . In other cases, the registration processing unit 35 does not perform registration processing.

  The packet buffer 37 stores the packet received from the reception processing unit 34 and the packet received from the PCIF reception processing unit 39. Then, after performing error packet filtering, speed adjustment (adjustment of packet transmission timing), packet transmission priority control, etc., the packet is transferred to the transmission processing unit 35 or the PCIF transmission processing unit 38.

  The PCIF transmission processing unit 38 transmits the packet received from the packet buffer 37 to the PC 4. The PCIF reception processing unit 39 transfers the packet received from the PC 4 to the packet buffer 37.

  FIG. 4 is a flowchart for explaining a processing procedure of registration processing control unit 33 of communication terminal 3 in the embodiment of the present invention. In the flowchart shown in FIG. 4, it is assumed that N ONUs are mounted on the communication terminal 3, and a case where ONUi (i = 0 to N−1) registration processing is performed will be described. The same MAC address is assigned to N ONUs.

  First, the registration processing control unit 33 invalidates all registration request packet transmission signals to the ONU 32 (S1). In this invalid state, the registration processing unit 36 of each ONU cannot transmit a registration request packet.

  Next, the registration processing control unit 33 initializes by substituting 0 for i (S2), and determines whether ONUi is registered (S3). If the ONUi is not registered (S3, No), the ONUi registration request packet transmission signal is validated (S4). If ONUi has already been registered (S3, Yes), the process proceeds to step S5. For example, if i = 0, it is determined whether or not ONU0 is already registered. If it is not registered, the registration request packet transmission signal to ONU0 is validated, and the registration request packet transmission signal to other ONUs is It remains invalid.

  When the registration request packet transmission signal to the ONUi becomes valid, the registration processing unit 36 of the ONUi can transmit the registration request packet, and executes the registration process shown in FIG. 5 to acquire the LLID.

  Next, the registration processing control unit 33 determines whether or not a registration inquiry packet has been received from the station side device 1 (S5). If the registration inquiry packet has not been received (S5, No), the process of step S5 is repeated. If a registration inquiry packet has been received (S5, Yes), the registration processing control unit 33 invalidates the ONUi registration request packet transmission signal (S6).

  Finally, the registration process control unit 33 increments i, and if i is N, substitutes 0 for i to initialize (S7), returns to step S3, and repeats the subsequent processes. As a result, the registration process of the next ONU is executed. When the LLID is assigned to the ONU by the registration process, the destination address of the ONU can be specified by the LLID thereafter. Therefore, even if the same MAC address is assigned to the N ONUs, there is no particular problem.

  As described above, according to the communication terminal in the present embodiment, the registration processing control unit 33 controls the registration request packet transmission signal, so that one ONU among the plurality of ONUs included in the communication terminal 3 is controlled. Since only the registration process is permitted, if one MAC address is assigned to a plurality of ONUs of the communication terminal 3, the registration process can be performed, and the number of MAC addresses assigned to the ONU can be reduced. became.

  Since a plurality of ONUs 32 are mounted on one communication terminal 3, the optical IF 31 can be shared, and the total cost of the system can be reduced.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a figure which shows the example of a connection of the communication terminal 3 in embodiment of this invention. It is a block diagram which shows schematic structure of the communication terminal 3 in embodiment of this invention. It is a block diagram which shows the internal structure of ONU32 shown in FIG. It is a flowchart for demonstrating the process sequence of the registration process control part 33 of the communication terminal in embodiment of this invention. It is a figure for demonstrating the procedure of the registration process in the conventional G-EPON system.

Explanation of symbols

  1 station side device, 2 optical coupler, 3 communication terminal, 4 PC, 31 optical IF, 32 ONU, 33 registration processing control unit, 34 reception processing unit, 35 transmission processing unit, 36 registration processing unit, 37 packet buffer, 38 PCIF Transmission processing unit, 39 PCIF reception processing unit.

Claims (4)

A communication terminal equipped with a plurality of optical subscriber line termination devices,
Conversion means for converting an external optical signal into an electrical signal;
A control for extracting a registration inquiry packet from the electrical signal converted by the conversion means, and controlling the registration inquiry packet so that one of the plurality of optical subscriber line terminating devices executes a registration process. and it means only including,
The plurality of optical subscriber line termination devices are communication terminals that individually execute a registration process using the same MAC address .   The converting means converts an optical signal from the outside into an electric signal, outputs the electric signal to the plurality of optical subscriber line terminators and the control means, and calculates an electric signal from the plurality of optical subscriber line terminators The communication terminal according to claim 1, which is then converted into an optical signal and output to the outside.   The control means extracts a registration inquiry packet from the electrical signal converted by the conversion means, and transmits a registration request packet by one of the plurality of optical subscriber line terminating devices in response to the registration inquiry packet. The communication terminal according to claim 1 or 2, wherein the communication terminal is valid and the transmission of a registration request packet by any other optical subscriber line terminating device is invalidated. A registration processing method for a plurality of optical subscriber line termination devices,
Extracting a registration inquiry packet from externally received packets;
Controlling the extracted registration inquiry packet such that one of the plurality of optical subscriber line terminating devices performs a registration process ;
A plurality of optical subscriber line termination devices individually executing a registration process using the same MAC address .

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