JP4530963B2 - Optical access method switching method - Google Patents

Description

  The present invention relates to an optical access system switching method and an optical transmission system, and more particularly to an optical access system switching method and an optical transmission system suitable for switching an existing media converter system to a PON system.

  Conventionally, as an optical access method using an optical fiber as a transmission medium connecting an optical communication provider station (BOX station) and a subscriber's home, a media converter method using a media converter (optical signal / electrical signal converter) is known. Widely used. As shown in FIG. 6, the media converter method includes a station side media converter 111 installed in an optical communication carrier station and a subscriber side media converter (not shown) installed in a subscriber's house. One or two optical fiber core wires (hereinafter, one optical fiber) through three main-system closures 121 to 123 and one of the first to sixth drop closures 131 to 136. Are connected in a one-to-one manner using an “existing Medicon core wire” (in the figure, the cross indicates the station side media converter 111 and the subscriber side media converter are connected). To show.) Therefore, in such a media converter system, the number of optical fiber cores increases as the number of subscribers increases.

  Therefore, as the number of subscribers increases, in order to make effective use of optical fibers, an optical coupler can be used to branch one optical fiber core into multiple optical fiber cores. Switching to a PON (Passive Optical Network) system in which one-to-many connection is established between a PON master set installed in a subscriber station and a PON slave set installed in a subscriber's home.

Conventionally, switching from the media converter system to the PON system (hereinafter referred to as “optical access system switching”) is performed as follows, for example.
As shown in FIG. 7, the PON base unit 141 and the optical coupler 142 are installed in the optical communication carrier station, and 16 unused unused 16 branching couplers 151 installed in the vicinity of the first drop closure 131 are installed. Medicon core wires are connected (in FIG. 7, only 10 existing medicon core wires are connected), and optical coupler 142 and 16-branch coupler 151 are connected using unused existing medicon core wires indicated by broken lines in FIG. By connecting, a PON system is constructed in advance. Thereafter, the subscriber-side media converter is replaced with a PON slave unit, and as shown by the arrow in FIG. 7, the PON slave unit is not an existing medicon core wire connected to the subscriber-side media converter before replacement. An operation (core wire switching operation) for connecting to one of the 16 unused existing Medicon core wires connected to the 16-branch coupler 151 (see the one-dot chain line in FIG. 7) is performed.

In Patent Document 1 below, a device-side optical fiber optically connected to a transmission device is accommodated in a coupler so that an optical fiber can be efficiently and economically added in response to an increase in the number of users. The optical fiber branches into a plurality of external optical fibers via a station optical coupler housed in the section, and each of the optical fibers is routed to a distribution optical coupler housed in an optical junction box. In an optical transmission system in which a plurality of distribution optical fibers are branched by a distribution optical coupler and each of these distribution optical fibers is routed to a terminal, a plurality of types of station-side optical couplers having different branch numbers are provided in the coupler housing. An optical wiring method in which the number of distribution optical couplers and the number of branches that are optically connected to one transmission device via a station-side optical coupler are different depending on the number of branches of each station-side optical coupler. It is disclosed.
JP 2005-17519 A

However, in the conventional optical access method switching method described above, the replacement work from the subscriber-side media converter to the PON slave unit is performed on the day convenient for the subscriber. There was a problem that it was not possible to carry out all of them at the same time, and it was necessary to carry out the road use procedures and local measures involved in the core switching work many times, and the various expenses required for the core switching work were also increased.
In addition, the existing Medicon core wire that was used before switching the core wire remains disconnected, so that when using the core wire at a later date, there is a risk that it may cause poor opening, such as misrecognizing the cutting status. There was a problem.

  An object of the present invention is to provide an optical access system switching method and an optical transmission system capable of efficiently switching from an existing media converter system to a PON system without causing poor opening.

In the optical access system switching method of the present invention, a station side media converter (11) installed in an optical communication provider station and a plurality of subscriber side media converters include a plurality of drop closures (31 to 36) and at least From the existing media converter system connected one-to-one via a plurality of existing Medicon cores including one unused existing Medicon core, the plurality of subscriber-side media converters are used as PON slave units. The PON master unit (41) newly installed in the communication carrier station and the PON slave unit to be replaced are replaced with the plurality of drop closures and the plurality of existing Medicon cores. An optical access system switching method used for switching to a PON system connected in a one-to-many manner, comprising an optical cap with a connector connected to the PON master unit (42) in the first step of installing the optical communication carrier station, and when replacing one of the plurality of subscriber-side media converters with a PON slave unit, The end of the optical communication carrier station side of the existing Medicon core wire connecting the station side media converter and the one subscriber side media converter on a one-to-one basis is removed from the station side media converter. A second step of connecting to the optical coupler with connector and a second step of repeating the second step until a predetermined number of subscriber-side media converters among the plurality of subscriber-side media converters are replaced with PON slave units. 3 and when the predetermined number of subscriber-side media converters are replaced with PON slave units, an optical coupler (43) is newly added to the optical communication carrier station. A fourth step of newly installing a branch coupler (51) in the vicinity of one drop closure of the plurality of drop closures, and connecting to the PON base unit, and the at least one The optical coupler and the branch coupler are connected using one unused existing medicon core wire of the unused existing medicon core wires, and the end on the optical communication carrier station side is connected to the connector A fifth step of removing all the existing Medicon cores connected to the optical coupler with a connector from the optical coupler with a connector, and the existing Medicon core removed from the optical coupler with a connector at the place where the branch coupler is installed. All are connected to the branch coupler, and the PON master unit and the replaced PON slave unit are connected via the optical coupler and the branch coupler. And a sixth step of connecting.

The optical access method switching method and the optical transmission system of the present invention have the following effects.
(1) When replacing the subscriber-side media converter with a PON slave unit, connect the end of the existing mediacon cable that connects the station-side media converter to the subscriber-side media converter in a one-to-one manner on the optical communication provider station side. By connecting to an optical coupler with a connector, each subscriber can switch to the PON system at the same time as replacing the media conversion on the subscriber side with a PON slave unit on a convenient day, so the existing media converter system can be switched to the PON system. Can be efficiently switched.
(2) When a predetermined number of existing Medicon cores are connected to the optical coupler with connector, the optical couplers and branch couplers are connected using unused existing Medicon cores, and a predetermined number of existing Medicon cores are connected. By connecting the line to the branch coupler, there is no need to perform a core switching operation when switching to the PON system, so that the problem of poor opening in the conventional optical access system switching method can be solved.

  An optical coupler with a connector connected to the PON base unit is installed in the optical communication carrier station for the purpose of switching from the existing media converter method to the PON method efficiently and without causing poor opening. When the subscriber-side media converter is replaced with a PON slave unit, the end of the existing medicon core that connects the station-side media converter and the subscriber-side media converter in a one-to-one relationship is connected to the optical communication provider station. Realized by connecting to a coupler.

Embodiments of an optical access system switching method and an optical transmission system according to the present invention will be described below with reference to the drawings.
First, with regard to the work procedure in the optical access method switching method according to one embodiment of the present invention, the station side media converter 11 installed in the optical communication carrier station (BOX station) and the first to tenth subscriber side media converters ( (Not shown) through the first to third trunk-system closures 21 to 23 and one of the first to sixth drop closures 31 to 36, the eleventh to twentieth existing medicon core wires An example of switching from an existing media converter method connected by using the PON method will be described with reference to FIGS.

  Note that the first to tenth existing medicon cores are not in use, and as shown by x in FIG. 1, the eleventh and eighteenth medicon cores are the first of the A trunk route. The drop closure 31 branches, the twelfth and fifteenth existing medicon cores branch at the second drop closure 32 of the A trunk route, and the fourteenth and nineteenth medicon cores are the A trunk route. The third drop closure 33 is branched, the thirteenth, seventeenth and twentieth existing medicon cores are branched at the fourth drop closure 34 of the A trunk route, and the sixteenth existing medicon core is It is assumed that the branch is made at the fifth drop closure 35 of the A trunk route.

  When switching from the existing media converter system to the PON system, as shown in FIG. 1, a PON base unit 41 and an optical coupler with connector 42 are newly installed in the optical communication carrier station.

After that, the worker inquires each subscriber about the convenient date for replacement work from the media converter on the subscriber side to the PON slave unit, and performs this replacement work on the convenient date for each subscriber. To do.
For example, on June 10, 2005, when an operator implements a work to replace a subscriber-side media converter connected to the 18th existing Medicon core wire with a PON slave unit in accordance with the convenience of this subscriber, As shown by a broken line in FIG. 2, an end (connector-connected) of the 18th existing Medicon core is removed from the station-side media converter 11 and attached to the optical coupler with connector 42. .

  After that, on June 25, 2005, when the worker carried out the construction to replace the subscriber-side media converter connected to the 14th existing Medicon core with a PON slave unit in accordance with the convenience of this subscriber, As shown by a broken line in FIG. 3, the end (connector connected) of the 14th existing Medicon core is removed from the station side media converter 11 and attached to the optical coupler with connector 42. .

  Thus, the work for replacing the subscriber-side media converter connected to the thirteenth to twentieth existing medicon core wires with the PON slave unit is carried out, and as shown in FIG. 4, the thirteenth to twentieth existing medicons are arranged. When the end (connector connected) of the optical fiber carrier station side of the core wire is detached from the station-side media converter 11 and attached to the optical coupler with connector 42, as shown in FIG. The optical coupler 43 is connected to the PON base unit 41 while being newly installed in the communication carrier station. A 16-branch coupler 51 is installed in the vicinity of the first drop closure 31.

  The optical coupler 43 and the 16-branch coupler 51 are connected using an unused ninth existing medicon core wire (see the one-dot chain line in FIG. 5). Further, the thirteenth to twentieth existing Medicon core wires are connected to the 16-branch coupler 51 (see the broken line in FIG. 5).

  As a result, for subscribers connected to the existing thirteenth to twentieth existing Medicon cores, the subscriber-side media conversion is replaced with a PON slave on a convenient day, and at the same time, the subscriber is switched to the PON system. Therefore, it is possible to efficiently switch from the existing media converter method to the PON method. Further, since it is not necessary to perform a core switching operation when switching to the PON system, it is possible to solve the problem of poor opening in the conventional optical access system switching method.

Next, an embodiment of the optical transmission system of the present invention will be described.
As shown in FIG. 4, an optical transmission system according to an embodiment of the present invention includes a station-side media converter 11 installed in an optical communication provider station (BOX station) and a PON parent installed in an optical communication provider station. Unit 41, optical coupler with connector 42 connected to PON base unit 41, two subscriber-side media converters (not shown) installed in two subscriber homes, and eight subscriber homes, respectively. 8 PON slave units (not shown) installed.

  Here, the two subscriber-side media converters are connected to the station-side media converter 11 on a one-to-one basis using eleventh and twelfth existing mediacon core wires. Further, the eight PON slave units are connected to the connector-equipped optical coupler 42 on a one-to-one basis using the thirteenth to twentieth existing Medicon core wires.

  That is, in the optical transmission system according to the present embodiment, the optical coupler with connector 42 installed in the optical communication carrier station and the PON slave unit installed in each subscriber's house are divided into branch couplers installed in the drop closure. They are connected in a one-to-one relationship using existing Medicon core wires without going through. By doing so, it is possible to efficiently switch the optical access method from the existing media converter method to the PON method and to prevent poor opening.

  As described above, the optical access system switching method and the optical transmission system of the present invention can be used to switch an existing media converter system to a PON system, for example.

It is a figure for demonstrating the procedure in the optical access system switching method by one Example of this invention. Example 1 It is a figure for demonstrating the procedure in the optical access system switching method by one Example of this invention. Example 1 It is a figure for demonstrating the procedure in the optical access system switching method by one Example of this invention. Example 1 It is a figure for demonstrating the procedure in the optical access system switching method by one Example of this invention. Example 1 It is a figure for demonstrating the procedure in the optical access system switching method by one Example of this invention. Example 1 It is a figure for demonstrating the procedure in the conventional optical access system switching method. It is a figure for demonstrating the procedure in the conventional optical access system switching method.

Explanation of symbols

11 Station side media converters 21 to 23 Trunk system closures 31 to 36 Drop closure 41 PON base unit 42 Optical coupler with connector 43 Optical coupler 51 16 branch coupler

Claims (1)

A station-side media converter (11) and a plurality of subscriber-side media converters installed in the optical communication service provider station include a plurality of drop closures (31 to 36) and at least one unused existing mediacon core. From the existing media converter system that is connected one-to-one via a plurality of existing Medicon cores including the above, the plurality of subscriber-side media converters are replaced with PON slave units, and the communication carrier station Switch to a PON system in which a newly installed PON master unit (41) and the PON slave unit to be replaced are connected one-to-many via the plurality of drop closures and the plurality of existing Medicon cores. An optical access method switching method used for
A first step of installing an optical coupler with connector (42) connected to the PON base unit in the optical communication carrier station;
When replacing one subscriber-side media converter of the plurality of subscriber-side media converters with a PON slave unit, the station-side media converter and the one subscriber-side media converter are in a one-to-one relationship. A second step of removing the end of the optical fiber operator station side of the existing Medicon core wire connected from the station side media converter and connecting to the optical coupler with connector;
A third step of repeating the second step until a predetermined number of subscriber-side media converters among the plurality of subscriber-side media converters are replaced with PON slave units;
When the predetermined number of subscriber-side media converters are replaced with PON slave units, an optical coupler (43) is newly installed in the optical communication carrier station and connected to the PON master unit, and a branch coupler (51) A fourth step of newly installing in the vicinity of one of the plurality of drop closures;
The optical coupler and the branch coupler are connected using one unused existing medicon core wire of the at least one unused existing medicon core wire, and an end on the optical communication carrier station side A fifth step of removing from the optical coupler with connector all the existing Medicon core wires connected to the optical coupler with connector;
At the place where the branch coupler is installed, all the existing Medicon core wires removed from the optical coupler with connector are connected to the branch coupler, and the PON master unit and the replaced PON slave unit are connected to the optical coupler and A sixth step of connecting via the branch coupler;
An optical access method switching method comprising:

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