HK1134870B - Subsctriber premises optical network unit - Google Patents
Subsctriber premises optical network unit Download PDFInfo
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- HK1134870B HK1134870B HK10102918.3A HK10102918A HK1134870B HK 1134870 B HK1134870 B HK 1134870B HK 10102918 A HK10102918 A HK 10102918A HK 1134870 B HK1134870 B HK 1134870B
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Description
Technical Field
The present invention relates to a subscriber premises-side optical line terminating apparatus installed in a subscriber premises in a PON type optical transmission system.
Background
In an optical network such as FTTH and CATV, as disclosed in patent document 1 below, the following optical transmission system is used: a passive Optical network (pon) type Optical transmission system in which an Optical transmission line connected to a center (center) is branched by a splitter (splitter) and the Optical transmission line is laid in a plurality of subscriber houses. Such a light transmission system is also called pds (passive Double star).
In the PON-type Optical transmission system, as shown in fig. 6, a central Optical Line Termination (OLT) 901 is connected to an integrated end of a splitter 903 via an Optical fiber (fiber)902, and Optical Line Termination (ONU) 905-1 and … 905-n provided in each customer premises are connected to a plurality of drop ends of the splitter 903 via Optical fibers 904-1 and … 904-n.
Fig. 7 shows ONUs 905-1 and … 905-n. Fig. 7 shows, as an example, a configuration of an ONU 905-1, and the ONU 905-1 has an optical transceiver (transceiver) section 906, an ONU function section 907, and an Ethernet (registered trademark) interface 908. The optical fiber 904-1 connected to the splitter 903 is connected to the optical transceiver 906 via an optical terminating unit 909 installed in each subscriber's house.
As the ethernet (registered trademark) interface 908, 10/100/1000BASE-TX or the like can be used, and a LAN cable (cable)910, for example, can be connected thereto. The LAN cable 910 can be directly connected to a terminal 914 such as a computer or a printer, and a switch such as a router 912 or a switching HUB (switching HUB)913 can be connected thereto, and another terminal 914 can be connected thereto.
Patent document 1: japanese unexamined patent publication No. 9-214541
When a communication failure or the like occurs in the PON-type optical transmission system, a unit for reading operation information of all ONUs is not provided in the current situation, and thus it is not easy to know where a problem has occurred inside an ONU. Further, there is a problem that a lot of time is required for an evaluation test of the ONU because there is no means for reading the operation information of the ONU at the time of manufacturing the ONU or at the time of maintenance.
Further, since the size of the ONU is becoming smaller, a space for installing a unit for reading the operation information of the ONU at the time of manufacturing or maintenance is also becoming a problem.
Disclosure of Invention
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a subscriber premises-side optical line terminal device capable of reading and setting operation information using a serial interface.
A first aspect of the present invention is an optical transmission line of a subscriber premises-side optical line terminal apparatus connected to a center-side optical line terminal apparatus and connected to an external node by a signal line to perform terminal processing, comprising: an electric/optical conversion unit connected to the center-side optical line terminal device and performing photoelectric conversion of a main signal and inverse photoelectric conversion; an optical line termination function unit connected to the electric/optical conversion unit and configured to perform termination processing of the main signal; a serial/parallel conversion unit connected to the optical line termination function unit and configured to perform serial-parallel conversion and inverse serial-parallel conversion of the main signal; and an interface module having: a main signal IF (interface) unit connected to the serial/parallel conversion unit and configured to input and output the main signal to and from the external node; a first serial IF section for inputting and outputting a predetermined serial signal; and a power supply IF unit connected to a power supply line and a ground line for supplying power, wherein when a predetermined condition is satisfied, the first serial signal terminal provided in the optical line termination function unit and the first serial IF unit are electrically connected to each other.
Another aspect of the subscriber premises-side optical line terminal apparatus of the present invention is characterized in that: the predetermined condition is satisfied when a predetermined voltage is applied to the ground line, and the first serial signal terminal and the first serial IF section are electrically disconnected when the predetermined condition is not satisfied.
Another aspect of the subscriber premises-side optical line terminal apparatus of the present invention is characterized by further comprising: when the predetermined condition is satisfied, the switching unit electrically connects between the first serial signal terminal and the first serial IF section.
Another aspect of the subscriber premises-side optical line terminal apparatus of the present invention is characterized in that: the switching means is a switching circuit that electrically connects the first serial IF section and the first serial signal terminal when the predetermined condition is satisfied, and that electrically disconnects the first serial IF section and the first serial signal terminal when the predetermined condition is not satisfied.
Another aspect of the subscriber premises-side optical line terminal apparatus of the present invention is characterized in that: when the given condition is not satisfied, the switch circuit electrically connects the first serial IF section and a second serial signal terminal provided in the electric/optical conversion section.
Another aspect of the subscriber premises-side optical line terminal apparatus of the present invention is characterized in that: the interface module further has a second serial IF section connected to a second serial signal terminal provided in the electric/optical conversion section.
Another aspect of the subscriber premises-side optical line terminal apparatus of the present invention is characterized in that: the first serial signal terminal and a second serial signal terminal provided in the electric/optical conversion unit are bus-connected to the first serial IF unit, and the switching unit permits access from the first serial IF unit to the optical line termination device function unit through the first serial signal terminal when it is determined that the predetermined condition is satisfied.
Another aspect of the subscriber premises-side optical line terminal apparatus of the present invention is characterized in that: the first serial signal terminal and the first serial IF section are connected by I2C.
Another aspect of the subscriber premises-side optical line terminal apparatus of the present invention is characterized in that: the second serial signal terminal and the first serial IF section are connected by I2C.
According to the present invention, it is possible to provide a subscriber premises-side optical line terminal device capable of reading and setting operation information by enabling switching of the serial interface.
Drawings
Fig. 1 is a block diagram showing a schematic configuration of a subscriber premises-side optical line termination device according to embodiment 1 of the present invention.
Fig. 2 is a configuration diagram showing an example of a PON type optical transmission system using the optical line termination apparatus at the customer premises side according to the present embodiment.
Fig. 3 is a block diagram showing a state in which the subscriber premises-side optical line terminating device of the present embodiment is connected to a test device.
Fig. 4 is a block diagram showing a schematic configuration of a subscriber premises-side optical line termination device according to embodiment 2 of the present invention.
Fig. 5 is a block diagram showing a schematic configuration of a subscriber premises-side optical line termination device according to embodiment 3 of the present invention.
Fig. 6 is a configuration diagram showing a conventional optical transmission system.
Fig. 7 is a block diagram showing a schematic configuration of a subscriber premises-side optical line termination device of a conventional optical transmission system.
In the figure: 1. 2-optical transmission system, 10-PON interface card, 11, 901-OLT, 12-authentication function section, 20, 40, 902, 904-optical fiber, 30, 903-optical coupler (coupler), 50-ONU, 70-external node, 80, 914-terminal equipment, 100, 200, 300, 905-subscriber-premises-side optical line termination device, 110-electrical/optical conversion section, 111-second serial signal end, 120, 907-ONU function section, 121-first serial signal end, 130-serial/parallel conversion section, 140, 240, 340-interface module, 141, 241, 341-main signal IF section, 142, 242, 342-first serial IF section, 143-second serial IF section, 144, 244, 344-supply IF section, 150a, 150 b-first serial transmission line, 151a, 151 b-parallel transmission line, 152a, 152 b-second serial transmission line, 170a, 170b, 270a, 270 b-switching circuit, 180-test device, 181-voltage adding section, 182-serial signal input/output section, 190-processing section.
Detailed Description
(embodiment mode 1)
The configuration of a subscriber premises-side optical line termination device according to a preferred embodiment of the present invention will be described in detail with reference to the drawings. Fig. 1 is a block diagram showing a configuration of a subscriber premises Optical Network Unit (ONU) according to embodiment 1 of the present invention. Fig. 2 shows an example of a PON-type optical transmission system configured by using the ONU100 of the present embodiment shown in fig. 1.
In the PON-type optical transmission system 1 of fig. 2, a PON interface card 10 provided at the center includes an Optical Line Termination (OLT)11 and an authentication function unit 12, and one end of an optical fiber 20 as an optical transmission line is connected to an optical input/output end of the OLT 11. The optical coupler (optical integrating/demultiplexing unit) 30 has one integrated end and 2 or more demultiplexed ends, and the other end of the optical fiber 20 connected to the OLT11 is connected to the integrated end.
One ends of a plurality of optical fibers 40-1, …, and 40-n (n is a natural number, hereinafter referred to as 40-1 to n) are connected to the wavelength division end of the optical coupler 30, and ONUs 50-1 to n are connected to the other ends of the plurality of optical fibers. With such a configuration, the downstream signal from OLT11 is demultiplexed by optical coupler 30 and transmitted to ONUs 50-1 to n, and the optical signals transmitted from ONUs 50-1 to n are combined by optical coupler 30 and transmitted to OLT 11.
The ONUs 50-1 to n are installed in each customer premises, and external nodes 70 such as personal computers and switches are connected thereto. In fig. 2, the external node 70 is a switch, and a plurality of terminals 80 are connected to a plurality of ports 70a provided in the switch. Among the switches used in the external node 70 are an L2 switch, an L3 switch, a router, and the like. With such a configuration, the ONU100 can connect a plurality of terminal apparatuses 80 to the central OLT 11.
A predetermined device suitable for GPON (a format conforming to ITU standard g.984.x, abbreviated as Gigabit Passive optical network) or GEPON (a format conforming to ieee802.3ah, abbreviated as Gigabit ethernet (registered trademark) PON) is used for OLT11 and ONUs 50-1 to n.
The ONU100 of the present embodiment can be used as the ONUs 50-1 to n shown in fig. 2. Next, as an example, the ONU100 is used for the ONU 50-1. As shown in fig. 1, an ONU100 according to the present embodiment includes: an electric/optical conversion section (TRx) 110; an optical line termination function unit (hereinafter referred to as an ONU function unit) 120; a serial/parallel conversion section (SERDES)130 and an interface module 140.
The electric/optical conversion unit 110 and the ONU-functional unit 120 are connected to each other by first serial transmission lines 150a (downlink signal line) and 150b (uplink signal line) for transmitting serial electric signals as signal lines for transmitting main signals. The ONU functional unit 120 and the serial/parallel converter 130 are connected by parallel transmission lines 151a (downlink signal line) and 151b (uplink signal line) for transmitting parallel electric signals. The parallel signals transmitted through the parallel transmission lines 151a and 151b may be, for example, 10-bit signals. The serial/parallel converter 130 and the interface module 140 are connected by second serial transmission lines 152a (downlink signal line) and 152b (uplink signal line) for transmitting serial electrical signals. The electric/optical converter 110 has an optical input/output terminal for transmitting/receiving an optical signal to/from the OLT11 on the center side through the optical fiber 40, and converts an optical signal (downstream signal) of the main signal transmitted from the OLT11 on the center side into an electrical signal (photoelectric conversion). The electric signal is output to the ONU functional unit 120 via the first serial transmission line 150a as a downlink signal line. The electric-optical conversion unit 110 also converts an electric signal of the main signal input from the ONU functional unit 120 via the upstream signal line, i.e., the first serial transmission line 150b, into an optical signal (inverse photoelectric conversion). The optical signal is sent to the OLT11 via the optical fiber 40.
The ONU functional unit 120 converts the serial signal input from the electrical/optical converter 110 into a parallel signal, performs a predetermined terminal process, and outputs the converted signal to the serial/parallel converter 130 via the parallel transmission line 151a as a downlink signal line. The ONU functional unit 120 performs predetermined termination processing on a signal input from the serial/parallel converter 130 via the parallel transmission line 151b as an uplink signal line, converts the signal into a serial signal, and outputs the serial signal to the electric/optical converter 110.
The serial/parallel conversion unit 130 includes a serial/parallel conversion unit and an inverse serial/parallel conversion unit, not shown, and converts the parallel signal input from the ONU functional unit 120 into a serial signal by the inverse serial/parallel conversion unit, and outputs the serial signal to the interface module 140 through the second serial transmission line 152a as a downlink signal line. The serial/parallel converter 130 converts the serial signal input from the interface module 140 through the second serial transmission line 152b into a parallel signal by the serial/parallel converter, and outputs the parallel signal to the ONU functional unit 120.
Interface module 140 is connected to external node 70 with serial electrical signals. In the ONU100 according to the present embodiment, the interface module 140 is configured to be directly connectable to an MSA (Multi-Source agent) interface slot (not shown) provided in the external node 70 in accordance with the standard of the MSA interface. As the standard of the MSA interface, there are GBIC, SFP, and the like.
The interface module 140 has: a main signal IF section 141; a first serial IF section 142; a second serial IF section 143 and a power supply IF section 144. The second serial transmission lines 152a and 152b connected to the serial/parallel conversion unit 130 and transmitting the main signal input/output to/from the external node 70 are connected to the main signal IF unit 141.
The ONU functional unit 120 and the electric/optical converter 110 each have a first serial signal terminal 121 and a second serial signal terminal 111, and are connected to the first serial IF unit 142 and the second serial IF unit 143, respectively. The signal lines 161a, 161b between the second serial signal terminal 111 and the second serial IF section 143 are constituted by I2C. The I2C (Inter Integrated Circuit) signal line is constituted by 2 signal lines of a signal line 161a for transmitting serial data and a signal line 161b for transmitting a clock.
The power supply IF unit 144 is connected to a power supply line 162a and a ground line 162 b. When the interface module 140 is connected to the external node 70, the ground line 162b is grounded, and power is supplied from the external node 70 to the ONU100 via the power supply line 162 a.
In the ONU100 according to the present embodiment, the first serial signal end 121 of the ONU-functional unit 120 is further connected to the signal lines 160a and 160b, and the other ends of these signal lines are connected to the first serial IF unit 142. Further, switch circuits 170a and 170b are provided in the middle of the signal lines 160a and 160 b. As the switching circuits 170a and 170b, a relay, a switch, and a diode are used. As the signal lines 160a and 160b, an I2C signal line can be used as in the case of the signal lines 161a and 161 b. Alternatively, a GPIO signal line connected to a GPIO terminal (not shown) of the ONU functional unit 120 may be used.
The switching circuits 170a and 170b are connected to the ground line 162b in a branched manner to input a control signal, and control a voltage applied to the ground line 162b as the control signal so that the signal lines 160a and 160b are energized or deenergized. That is, when the ground line 162b is grounded, the switch circuits 170a and 170b are turned off, and the signal lines 160a and 160b are turned off. When a predetermined voltage is applied to the ground line 162b, the switching circuits 170a and 170b are turned on, and the signal lines 160a and 160b are turned on.
In normal use of the ONU100, the ONU100 is connected to the MSA interface slot of the external node 70, and the ground line 162b is grounded via the external node 70. As a result, the switching circuits 170a and 170b are turned off, and the signal lines 160a and 160b are disconnected. Therefore, when the ONU100 is connected to the external node 70, no signal can be transmitted and received between the first serial signal terminal 121 of the ONU functional unit 120 and the first serial IF unit 142.
On the other hand, when the ONU100 is connected to a test device used at the time of manufacturing the ONU100 or at the time of maintenance, etc., the test device can be configured to apply a predetermined voltage to the ground line 162 b. Fig. 3 shows a state in which the ONU100 is connected to the test equipment having the above-described configuration. Here, the signal lines 160a and 160b are I2C signal lines, as well as the signal lines 161a and 161b, the signal line 160a is a signal line for transmitting serial data, and the signal line 160b is a signal line for transmitting a clock.
The signal lines 160a and 160b may be signal lines used only when the test equipment is connected or signal lines used for another purpose in normal use. In the ONU100 shown in fig. 1 and 3(a), the signal lines 160a and 160b are signal lines used only when the test equipment is connected. In the ONU100 ' shown in fig. 3(b), the signal lines 160a ' and 160b ' are electrically connected to the predetermined processing unit 190 during normal use, and are used for another purpose.
For example, in a normal use, a rate control signal or a los (loss of signal) signal may be transmitted from the predetermined processing unit 190 to the first serial IF unit 142, for example, by a GPIO signal. When the ONU100 ' is connected to the test device 180, the signal lines 160a ' and 160b ' are switched to be connected to the ONU functional unit 120 and the first serial IF unit 142 via the switching circuits 170a ' and 170b '.
The function of the processing unit 190 may be realized by the ONU function unit 120 or the serial/parallel converter 130.
The test device 180 shown in fig. 3(a) includes a voltage applying unit 181 and a serial signal input/output unit 182. When the ONU100 is connected to the test device 180, the power supply IF unit 144 is connected to the power supply voltage unit 181 via the ground line 162b, a predetermined voltage is applied, and the signal line 160a is connected to the serial signal input/output unit 182. At this time, switching circuits 170a and 170b detect that a predetermined voltage is applied to ground line 162b, and switch to the conduction state. As a result, the serial signal input/output unit 182 can access the ONU functional unit 120 through the signal line 160a, and input the operation information of the ONU functional unit 120 or output a predetermined set value to set the ONU functional unit 120. The same switching is performed when the ONU 100' shown in fig. 3(b) is connected to the test equipment 180.
As described above, in the ONU100 according to the present embodiment, the signal lines 160a and 160b and the switch circuits 170a and 170b are provided between the first serial signal terminal 121 of the ONU functional unit 120 and the interface module 140, and when the ONU functional unit is connected to the external node 70, the switch circuits 170a and 170b are turned off, and the ONU functional unit 120 is not accessed from the first serial IF unit 142, and when the ONU functional unit is connected to the test device 180, the switch circuits 170a and 170b are turned on, and the ONU functional unit 120 is accessed. This improves the security during normal use, and enables the operation information of the ONU100 to be read and set during the manufacturing of the ONU100 or during maintenance.
The configuration of an ONU according to embodiment 2 of the present invention will be described with reference to fig. 4. Fig. 4 is a block diagram showing the configuration of the ONU200 according to embodiment 2. In ONU200 according to the present embodiment, interface module 240 includes main signal IF section 241, first serial IF section 242, and power supply IF section 244, and does not include the second serial IF section.
Further, the ONU200 has additional switching circuits 270a, 270b instead of the switching circuits 170a, 170 b. The switch circuits 270a and 270b are controlled so that either the first serial signal terminal 121 connected to the ONU functional section 120 or the second serial signal terminal 111 of the electric/optical conversion section 110 is switched from the first serial IF section 242. Each of the switch circuits 270a and 270b has 3 contacts, and each of the signal lines connected to the first serial IF unit 242, the first serial signal terminal 121, and the second serial signal terminal 111 is connected to each of the contacts.
In fig. 4, a signal line 263a from the first serial IF unit 242 is connected to a contact 271a of the switch circuit 270a, a signal line 260a from the first serial signal terminal 121 is connected to a contact 272a, and a signal line 261a from the second serial signal terminal 111 is connected to a contact 273 a. Similarly, the signal line 263b from the first serial IF unit 242 is connected to the contact 271b of the switch circuit 270b, the signal line 260b from the first serial signal terminal 121 is connected to the contact 272b, and the signal line 261b from the second serial signal terminal 111 is connected to the contact 273 b.
In the present embodiment, all of the signal lines 263a, 263b, 260a, 260b, 261a, and 261b connected to the first serial IF unit 242 directly or through the switch circuits 270a and 270b are I2C. The switching circuits 270a and 270b are connected to the ground line 262b in a branched manner for receiving a control signal, and switching control of the switching circuits 270a and 270b is performed using the voltage applied to the ground line 262b as the control signal.
When the ONU200 is normally connected to the MSA interface slot of the external node 70 for use, the ground line 262b is grounded via the external node 70. At this time, the switch circuits 270a, 270b are connected to the contacts 271a and 273a and the contacts 271b and 273b, respectively. That is, when normally connected to the external node 70 for use, the first serial IF section 242 is connected to the second serial signal terminal 111 of the electric/optical conversion section 110.
On the other hand, as shown in fig. 4, when the ONU200 is connected to the test equipment 180 used at the time of manufacturing, maintenance, or the like, a predetermined voltage is applied to the ground line 262b from the voltage applying unit 181 of the test equipment 180. If a given voltage is applied to the ground line 262b, the switching circuits 270a, 270b are switched to connect the contacts 271a and 272a, and the contacts 271b and 272b, respectively. As a result, the first serial signal terminal 121 and the first serial IF unit 242 are connected, and the ONU functional unit 120 can be accessed from the serial signal input/output unit 182 of the test device.
In the ONU200 according to the present embodiment, by adopting a configuration in which the switching circuits 270a and 270b are provided to switch from the first serial IF unit 242 to the first serial signal terminal 121 of the ONU functional unit 120 or to the second serial signal terminal 111 of the electrical/optical converter 110, the ONU functional unit 120 can be accessed by the first serial IF unit 242 only when the ONU is connected to the test equipment 180 used at the time of manufacture, maintenance, or the like. Accordingly, the operation information of the ONU200 can be read and set at the time of manufacturing and maintenance, and the operation such as maintenance can be performed with high efficiency.
When the external node 70 is connected, the switch circuits 270a and 270b are switched to connect the first serial IF unit 242 to the second serial signal terminal 111 of the electrical/optical conversion unit 110, so that the ONU functional unit 120 cannot be accessed, thereby improving security.
The configuration of an ONU according to embodiment 3 of the present invention will be described with reference to fig. 5. Fig. 5 is a block diagram showing the configuration of ONU300 according to embodiment 3. In the ONU300 according to the present embodiment, the interface module 340 also includes a main signal IF unit 341, a first serial IF unit 342, and a power supply IF unit 344. In the present embodiment, the switch circuit is not used.
In fig. 5, the ONU functional unit 120 and the electric-optical converter 110 are connected in parallel to the I2C buses 363a and 363b, and are always connected from the first serial IF unit 342 to the first serial signal terminal 121 of the ONU functional unit 120 and the second serial signal terminal 111 of the electric-optical converter 110 via the I2C buses 363a and 363 b.
The ONU functional unit 120 is connected to the first serial IF unit 342 from the first serial signal terminal 121 via I2C buses 363a and 363b, and receives a control signal by branching from the ground line 362 b. Here, the ONU-functional unit 120 includes a connection line switching means, and determines whether or not to permit access from the first serial IF unit 342, based on whether or not a predetermined voltage is applied to the ground line 362b, using the voltage applied to the ground line 362b as a control signal.
When the ONU300 is normally connected to the MSA interface slot of the external node 70 for use, the ground line 262b is grounded via the external node 70. At this time, since a given voltage is not applied to the ground line 362b, the ONU functional section 120 does not allow access from the first serial IF section 342. When the ONU300 is connected to a test device used at the time of manufacture, maintenance, or the like, a predetermined voltage is applied from the test device to the ground line 362 b. The ONU functional section 120 allows access from the first serial IF section 342 IF it detects that a given voltage is applied to the ground line 362 b.
In this way, when the ONU300 is connected only to a test device used at the time of manufacturing, maintenance, or the like of the ONU, the ONU300 can read and set the operation information at the time of manufacturing or maintenance as a configuration in which the ONU function section 120 can be accessed by the first serial IF section 342, and the operation such as maintenance can be performed with great efficiency.
Further, when the ONU300 is connected to the external node 70, since the ground line 362b is grounded and a predetermined voltage is not applied, the ONU functional section 120 can detect it, and the ONU functional section 120 cannot be allowed to access from the first serial IF section 342. Accordingly, unauthorized access to the ONU function unit can be prevented, and security can be improved.
The electric/optical conversion unit 110 connected to the I2C buses 363a, 363b can always transmit signals between the second serial signal terminal 111 and the first serial IF unit 342.
The description of the present embodiment shows an example of the subscriber premises-side optical line termination device of the present invention, but is not limited to this. The detailed configuration, the detailed operation, and the like of the subscriber premises-side optical line termination device according to the present embodiment can be modified as appropriate without departing from the spirit and scope of the present invention.
Claims (5)
1. A subscriber premises optical line terminal device connected to a center side optical line terminal device via an optical transmission line and connected to an external node via a signal line for terminal processing,
the method comprises the following steps: an electric/optical conversion unit connected to the center-side optical line terminal device and performing photoelectric conversion and inverse photoelectric conversion of a main signal;
an optical line termination function unit connected to the electrical/optical conversion unit, for performing termination processing of the main signal;
a serial/parallel conversion unit connected to the optical line termination function unit and configured to perform serial-parallel conversion and inverse serial-parallel conversion of the main signal; and
an interface module having: a main signal IF (interface) unit connected to the serial/parallel conversion unit and configured to input and output the main signal to and from the external node; a first serial IF section for inputting and outputting a predetermined serial signal; and a power supply IF part connected to a power supply line and a ground line for supplying power,
electrically connecting a first serial signal terminal provided in the optical line termination function section and the first serial IF section when a predetermined condition is satisfied,
the given condition is established when a given voltage is applied to the ground line,
electrically disconnecting the first serial signal terminal and the first serial IF section when the given condition is not satisfied,
the subscriber premises-side optical line terminal apparatus further includes a switching unit:
when the predetermined condition is satisfied, the switching unit electrically connects between the first serial signal terminal and the first serial IF section,
the switching means is a switching circuit that electrically connects the first serial IF section and the first serial signal terminal when the predetermined condition is satisfied, and that electrically disconnects the first serial IF section and the first serial signal terminal when the predetermined condition is not satisfied,
when the given condition is not satisfied, the switch circuit electrically connects the first serial IF section and a second serial signal terminal provided in the electric/optical conversion section.
2. A subscriber premises optical line terminal device connected to a center side optical line terminal device via an optical transmission line and connected to an external node via a signal line for terminal processing,
the method comprises the following steps: an electric/optical conversion unit connected to the center-side optical line terminal device and performing photoelectric conversion and inverse photoelectric conversion of a main signal;
an optical line termination function unit connected to the electrical/optical conversion unit, for performing termination processing of the main signal;
a serial/parallel conversion unit connected to the optical line termination function unit and configured to perform serial-parallel conversion and inverse serial-parallel conversion of the main signal; and
an interface module having: a main signal IF (interface) unit connected to the serial/parallel conversion unit and configured to input and output the main signal to and from the external node; a first serial IF section for inputting and outputting a predetermined serial signal; and a power supply IF part connected to a power supply line and a ground line for supplying power,
electrically connecting a first serial signal terminal provided in the optical line termination function section and the first serial IF section when a predetermined condition is satisfied,
the given condition is established when a given voltage is applied to the ground line,
electrically disconnecting the first serial signal terminal and the first serial IF section when the given condition is not satisfied,
the subscriber premises-side optical line terminal apparatus further includes a switching unit:
when the predetermined condition is satisfied, the switching unit electrically connects between the first serial signal terminal and the first serial IF section,
the switching means is a switching circuit that electrically connects the first serial IF section and the first serial signal terminal when the predetermined condition is satisfied, and that electrically disconnects the first serial IF section and the first serial signal terminal when the predetermined condition is not satisfied,
the interface module also has a second serial IF section,
the second serial IF section is connected to a second serial signal terminal provided in the electric/optical conversion section.
3. A subscriber premises optical line terminal device connected to a center side optical line terminal device via an optical transmission line and connected to an external node via a signal line for terminal processing,
the method comprises the following steps: an electric/optical conversion unit connected to the center-side optical line terminal device and performing photoelectric conversion and inverse photoelectric conversion of a main signal;
an optical line termination function unit connected to the electrical/optical conversion unit, for performing termination processing of the main signal;
a serial/parallel conversion unit connected to the optical line termination function unit and configured to perform serial-parallel conversion and inverse serial-parallel conversion of the main signal; and
an interface module having: a main signal IF (interface) unit connected to the serial/parallel conversion unit and configured to input and output the main signal to and from the external node; a first serial IF section for inputting and outputting a predetermined serial signal; and a power supply IF part connected to a power supply line and a ground line for supplying power,
electrically connecting a first serial signal terminal provided in the optical line termination function section and the first serial IF section when a predetermined condition is satisfied,
the given condition is established when a given voltage is applied to the ground line,
electrically disconnecting the first serial signal terminal and the first serial IF section when the given condition is not satisfied,
the subscriber premises-side optical line terminal apparatus further includes a switching unit:
when the predetermined condition is satisfied, the switching unit electrically connects between the first serial signal terminal and the first serial IF section,
the first serial signal terminal and a second serial signal terminal provided in the electric/optical conversion section are bus-connected to the first serial IF section,
the switching unit allows access from the first serial IF unit to the optical line termination function unit via the first serial signal terminal when it is determined that the predetermined condition is satisfied.
4. The customer premises-side optical line termination device according to any one of claims 1 to 3, wherein:
the first serial signal terminal and the first serial IF section are connected by I2C.
5. The subscriber premises-side optical line termination device of claim 1 or 3, wherein:
the second serial signal terminal and the first serial IF section are connected by I2C.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007333597A JP4369972B2 (en) | 2007-12-26 | 2007-12-26 | Subscriber premises optical line termination equipment |
| JP2007-333597 | 2007-12-26 | ||
| PCT/JP2008/054346 WO2009081597A1 (en) | 2007-12-26 | 2008-03-11 | Subscriber premises optical network unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| HK1134870A1 HK1134870A1 (en) | 2010-05-14 |
| HK1134870B true HK1134870B (en) | 2013-08-30 |
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