JP4477680B2 - Subscriber premises optical line termination equipment - Google Patents

Description

  The present invention relates to a subscriber premises optical line terminating device installed in a subscriber premises in a PON type optical transmission system.

  In an optical network such as FTTH and CATV, as described in Patent Document 1 below, an optical transmission path connected to a center is branched by a passive splitter, and an optical transmission path is laid to a plurality of subscriber homes. A PON (Passive Optical Network) type optical transmission system is used. Such an optical transmission system is also called PDS (Passive Double Star).

  In the PON type optical transmission system, as shown in FIG. 6, an optical line termination device (OLT: Optical Line Termination) at the center is connected to a multiplexing end of a splitter 903 via an optical fiber 902, and a plurality of splitter 903 Optical line terminators (ONU: Optical Network Units) 905-1,... 905-n installed in each subscriber's house are connected to the demultiplexing ends via optical fibers 904-1,.

  The configuration of the ONU 905-1,... 905-n is shown in FIG. This figure shows the configuration of the ONU 905-1 as an example. The ONU 905-1 includes an optical transceiver unit 906, an ONU function unit 907, and an Ethernet (registered trademark) interface 908. An optical fiber 904-1 connected to the splitter 903 is connected to the optical transceiver unit 906 via an optical termination unit 909 provided at each subscriber's house.

As the Ethernet (registered trademark) interface 908, 10/100/1000 BASE-TX or the like can be used, and for example, a LAN cable 910 is connected thereto. A terminal device 914 such as a computer or a printer can be directly connected to the LAN cable 910, or a switch such as a router 912 or a switching hub 913 can be connected to another terminal device 914.
JP-A-9-214541

  Various settings may be required for LAN devices such as switches connected to ONUs on the subscriber's home side, depending on the LAN configuration, etc., but each subscriber has conventionally made individual settings for LAN devices. ing. The LAN device is provided with an interface for inputting various setting values. A personal computer or the like is connected to the interface so that the setting values can be input.

In the PON type optical transmission system, it may be necessary to change the setting value of a LAN device connected from the center side via the ONU. In this case, since there has conventionally been no means for directly inputting the setting value of the LAN device from the center side, an indirect request is made to notify the subscriber of a change in the setting value of the LAN device and the subscriber changes the setting value of the LAN device. The method was taken. For this reason, not only it takes time to change the setting value of the LAN device but also there is a risk of an input error and the reliability is poor.
Further, in a general ONU, there is a problem that there is no interface that provides means for changing various setting values other than the main signal line because the interface with the LAN device is only an Ethernet (registered trademark) cable. .

  Therefore, the present invention has been made to solve such problems, and can acquire LAN device setting data from a communication signal transmitted to the center and output this to the LAN device. It is an object of the present invention to provide a subscriber premises optical line termination device.

According to a first aspect of the subscriber-side optical line termination device of the present invention, an electrical / optical conversion unit that is connected to the center-side optical line termination device through an optical transmission line and performs photoelectric conversion and reverse photoelectric conversion; / Optical line terminator function unit that is connected to the electrical signal end of the optical conversion unit and performs termination processing, and serial / parallel conversion and inverse serial / parallel conversion connected to the parallel signal end of the optical line terminator function unit A serial / parallel conversion unit for performing, and an interface module having a first serial interface unit connected to a first serial signal terminal of the serial / parallel conversion unit and connected to an external LAN device, Further, the optical line terminator function unit and the interface module have a second serial signal end and a second serial interface unit, respectively, to transmit setting data. Are connected by means, said optical network unit function section has a setting data acquiring means for capturing a LAN device setting data from a predetermined channel of the communication signal being transmitted between the electrical / optical conversion part, The LAN device setting data acquired by the setting data acquisition unit is output from the second serial signal end to the data setting unit of the LAN device via the setting data transmission unit and the second serial interface unit. characterized in that that.

  In another aspect of the subscriber premises optical line termination device of the present invention, the predetermined channel is a maintenance channel on a PON protocol assigned to the communication signal, and the setting data acquisition means is the maintenance channel. The LAN device setting data is fetched from a channel.

  In another aspect of the subscriber premises optical line terminator of the present invention, the predetermined channel is a main signal channel on a PON protocol assigned to the communication signal, and the setting data acquisition means includes the main signal The LAN device setting data is fetched from a channel.

In another aspect of the customer premises optical line terminator according to the present invention, the second serial signal terminal and the second serial interface unit are I ² C compatible signal terminals, and the setting data transmission means is I ^{It is a 2} C signal line.

  According to another aspect of the optical network unit for a subscriber premises of the present invention, the second serial signal terminal and the second serial interface unit are GPIO compatible signal terminals, and the setting data transmission means is a GPIO signal line. It is characterized by being.

  According to the present invention, it is possible to provide a subscriber premises optical line terminator capable of extracting LAN device setting data from a communication signal transmitted to the center side and outputting the data to the LAN device. . As a result, improvement in convenience and improvement in reliability are realized.

(First embodiment)
With reference to the drawings, a detailed description will be given of the configuration of a subscriber premises optical line terminating device in a preferred embodiment of the present invention. FIG. 1 is a block diagram showing a configuration of a subscriber premises optical line termination unit (ONU) according to the first embodiment of the present invention. FIG. 2 shows an example of a PON type optical transmission system configured using the ONU 100 of this embodiment shown in FIG.

  In the PON type optical transmission system 1 of FIG. 2, the PON interface card 10 provided in the center is provided with an optical line terminator (OLT) 11, and an optical fiber 20 that is an optical transmission line at the optical input / output end of the OLT 11. Are connected at one end. The optical coupler (optical multiplexing / demultiplexing unit) 30 has one multiplexing end and two or more demultiplexing ends. The other end of the optical fiber 20 connected to the OLT 11 is connected to the multiplexing end. It is connected.

  One end of each of a plurality of optical fibers 40-1,..., 40-n (n: natural number, hereinafter referred to as 40-1 to n) is connected to the demultiplexing end of the optical coupler 30, and each other end is connected. Are connected to ONUs 50-1 to n. With such a configuration, the communication signal output from the OLT 11 is demultiplexed by the optical coupler 30 and transmitted to each of the ONUs 50-1 to n, while the upstream signals output from the ONUs 50-1 to n are optical signals. The signals are combined by the coupler 30 and transmitted to the OLT 11.

  Each of the ONUs 50-1 to 50-n is installed at each subscriber's house, and a LAN device 70 such as a personal computer or a switch is connected thereto. In FIG. 2, the LAN device 70 is a switch, and a plurality of terminal devices 80 are connected to a plurality of ports 70a provided in the switch. Examples of the switch used for the LAN device 70 include an L2 switch, an L3 switch, and a router. With such a configuration, a plurality of terminal devices 80 can be connected to the center OLT 11 via the ONU 100.

  The OLT 11 and the ONUs 50-1 to 50-n are GPON (abbreviation for Gigabit Passive Optical Network, a method compliant with ITU standard G.984.x), GEPON (abbreviation for Gigabit Ethernet (registered trademark) PON), and IEEE802. A device that conforms to the 3) standard) is used.

  The ONU 100 of this embodiment can be used for the ONUs 50-1 to 50-n shown in FIG. In the following, it is assumed that the ONU 100 is used for the ONU 50-1. As shown in FIG. 1, the ONU 100 of the present embodiment includes an electrical / optical conversion unit 110, an optical line terminator function unit (hereinafter referred to as ONU function unit) 120, a serial / parallel conversion unit 130, and an interface module (hereinafter referred to as “ONU function unit”). 140 (referred to as an I / F module).

  The electrical / optical conversion unit 110 has an optical input / output terminal 111 for transmitting / receiving an optical signal to / from the OLT 11 on the center side via the optical fiber 40, and an optical signal (from the center OLT 11) Communication signals) are converted into electrical signals (photoelectric conversion). This electric signal is output from the first electric signal terminal 112 to the second electric signal terminal 122 of the ONU function unit 120 via the first serial transmission line 150a which is a communication signal line. Also, an electrical signal input from the second electrical signal end 122 of the ONU function unit 120 via the first serial transmission path 150b that is an upstream signal line is converted into an optical signal (reverse photoelectric conversion), and this optical signal is converted into an optical signal. The data is transmitted from the optical input / output end 111 to the OLT 11 via the optical fiber 40.

  The ONU function unit 120 converts the electrical signal input from the electrical / optical conversion unit 110 into a parallel signal, performs a predetermined termination process on the termination processing unit 121, and then transmits a communication signal from the first parallel signal end 123. The signal is output to the second parallel signal terminal 131 of the serial / parallel converter 130 via the parallel transmission path 151a which is a line. The communication signal output from the OLT 11 includes a maintenance signal used for maintenance of the ONU 100 in addition to the main signal to be sent to the LAN device 70, and at least the main signal is transmitted to the parallel transmission path 151a. To the serial / parallel converter 130.

  The ONU function unit 120 performs a predetermined termination process on the parallel signal input from the second parallel signal end 131 of the serial / parallel conversion unit 130 via the parallel transmission path 151b that is an upstream signal line, and then performs the serial signal processing. And output from the second electrical signal end 122 to the electrical / optical converter 110. The parallel signal transmitted through the parallel transmission paths 151a and 151b can be, for example, a 10-bit signal.

  The serial / parallel conversion unit 130 includes serial / parallel conversion means and reverse serial / parallel conversion means (not shown). The parallel signal input from the ONU function unit 120 is converted into a serial signal by the reverse serial / parallel conversion means. From the first serial signal end 132 to the first serial interface unit 141 (hereinafter referred to as the first serial I / F unit) 141 of the I / F module 140 via the second serial transmission path 152a which is a communication signal line. Output. Also, the serial signal input from the first serial I / F unit 141 via the second serial transmission path 152b is converted into a parallel signal by the serial / parallel conversion means, and the ONU function is started from the second parallel signal terminal 131. Output to the unit 120.

  The I / F module 140 is connected to the LAN device 70 by a serial electrical signal. In the ONU 100 of the present embodiment, the I / F module 140 is compatible with the MSA (Multi-Source Agreement) interface standard, and can be directly connected to an MSA interface slot (not shown) provided in the LAN device 70. It has a possible configuration. Examples of MSA interface standards include GBIC and SFP.

  The I / F module 140 includes a second serial I / F unit 142 in addition to the first serial I / F unit 141 connected to the serial / parallel conversion unit 130. The ONU function unit 120 is also provided with a second serial signal terminal 124 in addition to the first parallel signal terminal 123, and the second serial signal terminal 124, the second serial I / F unit 142, Are connected by signal lines 161a and 161b.

  A communication signal transmitted to the OLT 11 has a plurality of channels for transmitting a main signal used in the LAN device 70 and another plurality of channels for transmitting a maintenance signal based on the PON protocol. is doing. The ONU function unit 120 terminates the communication signals transmitted through the plurality of channels by the termination processing unit 121. Of the communication signals subjected to termination processing, at least the main signal is transmitted to the LAN device 70 via the serial / parallel converter 130 and the first serial I / F unit of the I / F module 140.

  The ONU function unit 120 further includes a setting data acquisition unit 160. The setting data acquisition unit 160 uses the predetermined channel of the communication signal terminated by the termination processing unit 121 to set the LAN device with the center. Perform communication to obtain data. In the present embodiment, in order to acquire LAN device setting data, communication is performed using one or more channels designated in advance among a plurality of channels that transmit maintenance signals. The setting data acquisition unit 160 acquires LAN device setting data using the above-specified channel while confirming specifications with the OLT 11, for example.

  An example in which the ONU 100 of the present embodiment is connected to the LAN device 70 is shown in FIG. The setting data acquisition unit 160 outputs the LAN device setting data acquired using a predetermined channel of the communication signal to the second serial signal terminal 124 provided in the ONU function unit 120, and the second serial signal terminal 124. To the second serial I / F unit 142 via the signal lines 161a and 161b. The LAN device setting data is further output from the second serial I / F unit 142 to the data setting unit 71 of the LAN device 70. The signal lines 161 a and 161 b output LAN device setting data from the ONU function unit 120 to the LAN device 70.

An I ² C signal line can be used for the signal lines 161a and 161b serving as setting data transmission means. The I ² C signal line is composed of ^two signal lines, a serial data transmission signal line and a lock transmission signal line, which can be signal lines 161a and 161b, respectively. In this case, both the second serial signal terminal 124 and the second serial I / F unit 142 are configured by I ² C compatible signal terminals.

The ONU 100 according to the present embodiment includes setting data acquisition means 160 for acquiring LAN device setting data in the ONU function unit 120, and includes setting data transmission means for transmitting LAN device setting data to the LAN device 70. 2 serial signal ends 124, a second serial I / F unit 142, and signal lines 161 a and 161 b connecting between them. The setting data transmission means of this embodiment is composed of I ² C. Accordingly, setting data can be transmitted from the center OLT 11 to the LAN device 70 via the ONU 100 for setting.
As another embodiment of the subscriber premises optical line termination device of the present invention, a signal line as setting data transmission means may be a GPIO compatible signal line.

In the block diagram shown in FIG. 4, in the ONU 200 of this embodiment, the ONU function unit 220 includes a GPIO signal terminal 225 in addition to the I ² C signal terminal 224 as a serial signal terminal, and the GPIO signal terminal 225 is set as a LAN device. This is used for the second serial signal terminal for outputting data. At the same time, the second serial I / F unit 242 is also a GPIO compatible signal end. The second serial signal terminal 225 and the second serial I / F unit 242 are connected by GPIO compatible signal lines 261a and 261b.

  In the ONU 200 of the present embodiment, setting data transmission means for transmitting LAN device setting data to the LAN device 70 is a second serial signal terminal 225, a second serial I / F unit 242, and a signal that connects between them. It is comprised by the track | line 261a, 261b. The second serial signal terminal 225, the second serial I / F unit 242, and the signal lines 261a and 261b all correspond to GPIO. Accordingly, setting data can be transmitted from the center OLT 11 to the LAN device 70 via the ONU 100 for setting.

  FIG. 5 is a block diagram showing a configuration of a subscriber premises optical line termination device according to still another embodiment of the present invention. In the ONU 100 of the first embodiment and the ONU 200 of the second embodiment, LAN device setting data is transmitted using a channel for transmitting a maintenance signal. However, the ONU 300 of this embodiment transmits a main signal. The transmission is performed using any one of a plurality of channels.

Correspondingly, the setting data acquisition unit 360 of the present embodiment uses the one or more channels specified in advance among the plurality of channels of the main signal terminated by the termination processing unit 121 to perform LAN device setting data. Process to get. The LAN device setting data acquired by the setting data acquiring unit 360 through communication with the center is transmitted from the second serial signal terminal 324 provided in the ONU function unit 320 via the signal lines 361a and 361b to the second serial I / O. The data is transmitted to the F unit 342 and further output to the LAN device 70. The signal lines 361a and 361b serving as setting data transmission means can be either I ² C compatible signal lines or GPIO compatible signal lines.

  The ONU 300 of this embodiment also includes setting data acquisition means 360 for acquiring LAN device setting data in the ONU function unit 320, and the setting data acquisition means 360 uses predetermined channels of a plurality of channels that transmit main signals. It is possible to communicate with the center and transmit the LAN device setting data obtained as a result to the LAN device 70 via the signal lines 361a and 361b of the setting data transmission means.

  Note that the description in the present embodiment shows an example of the subscriber premises optical line termination device according to the present invention, and the present invention is not limited to this. The detailed configuration and detailed operation of the subscriber premises optical line terminating device in the present embodiment can be changed as appropriate without departing from the spirit of the present invention.

It is a block diagram which shows schematic structure of the subscriber premises optical line termination | terminus apparatus which concerns on the 1st Embodiment of this invention. It is a block diagram which shows an example of the PON type | mold optical transmission system in which the subscriber premises optical line termination | terminus apparatus of this embodiment was used. It is a block diagram which shows the state which connected the subscriber optical fiber terminal device of this embodiment to LAN apparatus. It is a block diagram which shows schematic structure of the subscriber premises optical line termination | terminus apparatus which concerns on another embodiment of this invention. It is a block diagram which shows schematic structure of the subscriber premises optical line termination | terminus apparatus which concerns on another embodiment of this invention. It is a block diagram which shows schematic structure of the subscriber premises optical line termination | terminus apparatus of the conventional optical transmission system. It is a block diagram which shows the conventional optical transmission system.

Explanation of symbols

1 Optical Transmission System 10 PON Interface Card 11, 901 OLT 20, 40, 902, 904 Optical Fiber 30, 903 Optical Coupler 50 ONU
70 LAN equipment 80, 914 Terminal equipment 100, 200, 300, 905 Subscriber premises optical line termination device 110 Electrical / optical converter 111 Optical input / output terminal 112 First electrical signal terminal 120, 220, 320, 907 ONU function Unit 121 termination processing means 122 second electric signal end 123 first parallel signal end 124, 324 second serial signal end 130 serial / parallel converter 131 second parallel signal end 132 first serial signal end 140, 240 Interface module 141 First serial I / F unit 142, 242, 342 Second serial I / F unit 150a, 150b First serial transmission path 151a, 151b Parallel transmission path 152a, 152b Second serial transmission path 160 360 Setting data acquisition means 161a, 161b, 261a, 2 1b, 361a, 361b signal path 224 ^{I 2} C signal terminal 225 GPIO signal terminal

Claims (5)

An electrical / optical converter connected to the center-side optical line terminator by an optical transmission line to perform photoelectric conversion and reverse photoelectric conversion;
An optical line terminator function unit that is connected to an electrical signal end of the electrical / optical conversion unit and performs termination processing;
A serial / parallel converter connected to a parallel signal terminal of the optical line terminator function unit to perform serial / parallel conversion and inverse serial / parallel conversion;
An interface module having a first serial interface unit connected to a first serial signal terminal of the serial / parallel conversion unit and connected to an external LAN device;
Further, the optical line terminator function unit and the interface module are respectively connected by a setting data transmission means having a second serial signal end and a second serial interface unit,
The optical network unit function section has a setting data acquisition means for acquiring a LAN device setting data by using the predetermined channel signal transmitted between the electrical / optical conversion part,
The LAN device setting data acquired by the setting data acquisition unit is output from the second serial signal end to the data setting unit of the LAN device via the setting data transmission unit and the second serial interface unit. that <br/> customer premises ONU, characterized in that.   The predetermined channel is a maintenance channel on a PON protocol assigned to a signal transmitted to the electrical / optical converter, and the setting data acquisition unit is configured to set the LAN device from the maintenance channel. 2. The subscriber premises optical line terminator according to claim 1, wherein data is captured. The predetermined channel is a main signal channel on a PON protocol assigned to a signal transmitted to / from the electrical / optical conversion unit,
2. The subscriber premises optical line termination device according to claim 1, wherein the setting data acquisition means takes in the LAN device setting data from the main signal channel. 4. The second serial signal end and the second serial interface unit are I ² C compatible signal ends, and the setting data transmission means is an I ² C signal line. The subscriber premises optical line termination device according to any one of the above. 4. The method according to claim 1, wherein the second serial signal end and the second serial interface unit are GPIO compatible signal ends, and the setting data transmission means is a GPIO signal line. A subscriber-side optical line termination device as described in 1.

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