CN111641893A

CN111641893A - Optical access network structure and adjusting method thereof

Info

Publication number: CN111641893A
Application number: CN202010627187.3A
Authority: CN
Inventors: 都永昌
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-07-02
Filing date: 2020-07-02
Publication date: 2020-09-08

Abstract

The invention discloses an optical access network structure, which comprises a trunk optical cable, an optical cross-connecting box, an optical fiber splitting box, a distribution optical cable and an optical cable entering a house; the machine room OLT is connected with the optical splitters in the optical cross-connecting box through a trunk optical cable, the optical splitters in the optical cross-connecting box are connected with the optical splitters in the optical fiber splitting box through distribution optical cables, and the optical splitters in the optical fiber splitting box are connected with the ONU through home cables; the optical splitter in the optical splitter box is at most two detachable and mountable optical splitters to form an adjustable networking structure. The invention realizes the purpose of rapid capacity expansion by directly adjusting the optical access network structure, provides the port access capability, can reduce the optical cable capacity expansion pressure from the optical distribution box to the fiber distribution box, and can rapidly realize FTTH port multiplication when the optical cable resources are short; meanwhile, investment and later maintenance cost are greatly reduced.

Description

Optical access network structure and adjusting method thereof

Technical Field

The invention belongs to the field of communication engineering construction, in particular to the technical field of optical access networks, and particularly relates to an optical access network structure and an adjusting method thereof.

Background

The optical access network is a generic name of all lines, devices, and facilities such as optical cables, optical cross-connecting/distributing facilities, and optical splitters from the OLT to the subscriber-side terminal equipment in the PON network. With reference to fig. 1, substantially comprises: trunk optical cables, optical cross-connecting boxes, optical distribution cables, optical fiber distribution boxes, home-entry optical cables and the like.

It is understood that the importance of optical access network construction is greater than 50% of the investment and cost per year for optical access networks and greater than 50% of the investment and cost for access networks for distribution cable construction and maintenance. Therefore, understanding and familiarizing the network evolution scheme of the access network has a very important meaning for the construction and later maintenance of the optical access network.

At present, the optical access network construction scheme mainly has two modes:

first order concentration splitting mode, as shown in fig. 2: during FTTH construction, install l in the optical cable handing-over box: 64 optical splitters. When the broadband is installed, the tail fiber of the optical splitter is connected into the optical fiber box, and then the user fiber is connected to the home of a customer through the flange, so that physical connection is realized.

Two-stage spectroscopic mode, as shown in fig. 3: during FTTH construction, install l in the optical cable handing-over box: 16 optical splitters, wherein a 1:4 optical splitter is arranged in an optical fiber box, 1:4 optical splitters are required to be newly added when the port of the last-stage optical splitter is used up, and optical cable resources occupying a core optical distribution box to the optical fiber box are newly added. When the broadband is installed, the tail fiber of the optical splitter is connected to the optical splitter in the optical fiber box, and the tail fiber of the optical splitter is connected with the user fiber to the home of a customer through the flange, so that physical connection is realized.

When the line resources of the two modes are full, only the optical cable is laid and the fiber distribution box is additionally arranged to provide a resource port. Fig. 4 and 5 illustrate the expansion of the first and second stages of the splitting lines, respectively. The capacity expansion schemes of fig. 4 and 5 have disadvantages: the construction period of the project is long, the similar situations are many, the project investment is large, and meanwhile, the later maintenance amount and the maintenance cost are correspondingly increased.

Disclosure of Invention

The invention provides an optical access network structure and an adjusting method thereof aiming at the problems in the background technology.

The technical scheme is as follows:

the invention discloses an optical access network structure, which comprises a trunk optical cable, an optical cross-connecting box, an optical fiber splitting box, a distribution optical cable and an optical cable entering a house; the machine room OLT is connected with the optical splitters in the optical cross-connecting box through a trunk optical cable, the optical splitters in the optical cross-connecting box are connected with the optical splitters in the optical fiber splitting box through distribution optical cables, and the optical splitters in the optical fiber splitting box are connected with the ONU through home cables; the optical splitters in the fiber splitting box are at most two detachably mountable optical splitters to form an adjustable networking structure.

Preferably, a two-core distribution optical cable + a plurality of in-home optical cables + an optical splitter structure is adopted for networking, and according to the number of end users, a specific networking structure is formed as follows:

the number of users is 2, and the two-core distribution optical cable and the two home-in optical cables are directly connected to the ONU;

the number of users is more than 2 and less than or equal to 5, one core of distribution cable is directly connected to the ONU, and the other core of distribution cable passes through one 1:4, the optical splitter is accessed to the ONU;

the number of users is more than 5 and less than or equal to 8, and the two-core distribution cable respectively passes through two 1:4, the optical splitter is accessed to the ONU;

the number of users is more than 8 and less than or equal to 12, and a core distribution cable passes through a 1:4, the optical splitter is accessed to the ONU; the other core of the distribution cable passes through a 1:8, the optical splitter is accessed to an ONU;

the number of users is more than 12 and less than or equal to 16, and the two-core distribution cable respectively passes through two 1: and 8, the optical splitter is connected with the ONU.

Preferably, the optical splitters in the fiber splitting box are changed according to the number of users, so that the capacity expansion requirements of more users are met.

The invention also discloses an adjusting method of the optical access network structure, when the number of users at the end of the network increases, the light splitting ratio in the fiber splitting box is selected to be 1: b, replacing it with a 1: the optical splitter of a, wherein a satisfies: a is more than or equal to b + n.

Preferably, the replacing step is:

s1, configuring a first-level 1: (64/a) a spectroscope: equipment maintenance personnel manufacture PON port data of the OLT on a network manager; configuring a trunk optical fiber light path by a resource maintainer; line maintainer is according to the data, accomplish at computer lab MODF frame, light distributing box respectively and jump fine to install one at the light distributing box 1: (64/a) opening the light path of the first-stage optical splitter to finish the adjustment and the measurement, wherein the first-stage optical splitter is in a usable state;

s2, user data touch: one of the fiber distribution boxes is checked to be 1: b, the splitter user data is backed up;

s3, configuring a secondary beam splitter: and at the optical cross connecting box, jumping the uplink optical path to 1: (64/a) splitter, removing 1: b, and newly installing a 1: the optical splitter of a completes optical path connection; the resource maintenance personnel configure the wiring light path resources and modify the splitting ratio attribute of the optical splitter equipment; so far, the secondary beam splitter is in a usable state;

s4, user service migration and change: the maintenance personnel adopt the operation of the co-location mobile phone according to the user data which is explored previously to change the user optical fiber to the new optical splitter, thereby realizing various services of the user.

Preferably, it further includes step S5, resource tag specification: and maintenance personnel in each link paste resource information labels in time and ensure that the resource information is accurate.

The invention has the advantages of

The invention realizes the purpose of rapid capacity expansion by directly adjusting the optical access network structure, provides the port access capability, can reduce the optical cable capacity expansion pressure from the optical distribution box to the fiber distribution box, and can rapidly realize FTTH port multiplication when the optical cable resources are short; meanwhile, investment and later maintenance cost are greatly reduced.

Drawings

FIG. 1 is a schematic diagram of an optical access network in the background art

FIG. 2 is a schematic diagram of a primary concentrated beam splitting mode in the background art

FIG. 3 is a schematic diagram of a two-stage light splitting mode in the background art

FIG. 4 is a schematic view of the capacity expansion structure of the light splitting circuit of FIG. 2

FIG. 5 is a schematic view of the capacity expansion structure of the light splitting circuit of FIG. 3

FIG. 6 is a schematic diagram of an optical access network structure in 2-user service according to an embodiment of the present invention

FIG. 7 is a schematic diagram of an optical access network structure when the number of users is greater than 2 users and less than or equal to 5 users according to an embodiment of the present invention

FIG. 8 is a schematic diagram of an optical access network structure with 5 users < the number of users < 8 users in the embodiment of the present invention

FIG. 9 is a schematic diagram of an optical access network structure with 8 users < the number of users ≤ 12 according to the embodiment of the present invention

FIG. 10 is a schematic diagram of an optical access network structure with 12 users < the number of users < 16 users in the embodiment of the present invention

Detailed Description

The invention is further illustrated by the following examples, without limiting the scope of the invention:

in the prior art, after an optical access network is built and accepted, the maximum number of access clients is determined, and when the access capability is lack, the problem is solved only by reconstruction. This solution is extremely uneconomical.

The problem that this scheme was solved is: the optical splitters in the fiber splitting box are designed into at most two detachably mountable optical splitters to form an adjustable networking structure. When the access capability is short, the access capability is quickly realized by adjusting the network structure, and the service requirement of a client is met.

The following describes the scheme of the present invention with reference to a specific embodiment by taking a line constructed in a two-stage splitting mode as an example (note: broadband user installation rate is the number of broadband users/the number of residents covered by each splitting box, and the number of residents covered by each splitting box is about 12 in an urban area and about 24 in a rural area).

In embodiment 1, with reference to fig. 6, when the installation rate of the broadband user is lower than 10% (2 users), the access may be performed by using a bare fiber + primary networking mode.

Embodiment 2, with reference to fig. 7, when the installation rate of the broadband user is lower than 15% (4 users), a secondary networking mode of one secondary splitting 1:4 optical splitter + one primary splitting 1:16 may be used for access.

Example 3, in conjunction with fig. 8, when the broadband user installation rate is lower than 33% (8 users), a two-level networking mode access of two-level splitting 1:4 splitters + one-level splitting 1:16 may be adopted (at this stage, the construction is one-step, each fiber distribution box in the city and the countryside can only provide 8 port capabilities, and the users covered by each fiber distribution box are 12 users and 24 users, and the solution of more than 8 users is not considered).

Embodiment 4, with reference to fig. 9, when the installation rate of broadband users is lower than 50% (12 users), a two-level networking mode access of a two-level splitter 1:4 + a first-level splitter 1:16, and a 1:8 + a first-level splitter 1:8 may be adopted.

Embodiment 5, with reference to fig. 10, when the broadband user installation rate is lower than 66% (16 users), a two-level networking mode of two 1:8 optical splitters + one-level optical splitter 1:8 may be used for access.

Therefore, the broadband port access capability is quickly provided only through network structure adjustment without construction on the basis of the existing line resources, and the market demand is met; meanwhile, a large amount of investment can be saved, the number of emergency projects is reduced, the working pressure is reduced, and the later-stage maintenance amount and the later-stage maintenance cost are reduced. At present, the user popularity rate in vast rural areas is generally more than 33%, and the above embodiment 4 or embodiment 5 can be adopted to realize the rapid provision of the port capability. In extreme cases, one or two 1:16 optical splitters and a two-level networking mode of a first-level optical splitter 1:4 can be adopted for access, so that the full coverage of the port capability is realized.

Before planning and designing an optical access network, determining a target network of the optical access network, and gradually constructing; after the optical access network is built, the network structure is adjusted according to the scheme, the capability of the FTTH port is provided, the market demand is met, and therefore a large amount of investment and cost are saved. In the initial stage of business development, the wide coverage of the capacity can be realized by a network structure with the total light splitting ratio larger than 64, and in the middle and later stages of business development, the capacity can be timely split for a pon port user, so that various business requirements are met.

The invention also provides an adjusting method of the optical access network structure, when the number of users at the end of the network increases, the light splitting ratio in the fiber splitting box is selected to be 1: b, replacing it with a 1: the optical splitter of a, wherein a satisfies: a is more than or equal to b + n.

When a single-core distribution cable is directly connected to an ONU, b is regarded as 1.

Preferably, the ratio of primary light splitting is 1: 4(b is 4), and the new number of users n is 4, as an example, the replacement procedure is described (i.e., example 3 replaces example 4 with the procedure of example 4, it can be seen that a is not less than 8, and in this example, a is 8):

s1, configuring a primary 1:8(64/8) optical splitter: equipment maintenance personnel manufacture PON port data of the OLT on a network manager; resource maintainers configure optical paths (trunk optical fibers); and line maintenance personnel finish fiber jumping on a MODF frame and an optical cross connecting cabinet of the machine room respectively according to the information, a 1:8 primary optical splitter is installed on the optical cross connecting cabinet, the optical path of the primary optical splitter is opened, the adjustment and the measurement are finished, and the primary optical splitter is in an available state.

S2, user data touch: checking user data of one optical splitter (1:4) in the fiber splitting box, and backing up the user data;

s3, configuring a secondary beam splitter: and jumping the uplink light path to a 1:8 optical splitter (a primary optical splitter) at the optical cross-connecting box, dismantling the 1:4 optical splitter at the optical fiber splitting box, and newly installing a 1:8 optical splitter (a secondary optical splitter) to complete light path connection. The resource maintainer configures the distribution optical path resource and modifies the splitter device attributes (modifies the splitting ratio). To this point, the secondary beamsplitter is in a usable state.

S4, user service migration and change: the maintainer adopts the operation of the co-location mobile phone according to the user data which is explored previously to change the user optical fiber to the new splitter, thereby realizing the use of various services (broadband, telephone, IPTV) of the user.

The content of the invention not described is not described in detail in the prior art.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims

1. An optical access network structure comprises a trunk optical cable, an optical cross-connecting box, an optical fiber splitting box, a distribution optical cable and an optical cable for entering a house; the machine room OLT is connected with the optical splitters in the optical cross-connecting box through a trunk optical cable, the optical splitters in the optical cross-connecting box are connected with the optical splitters in the optical fiber splitting box through distribution optical cables, and the optical splitters in the optical fiber splitting box are connected with the ONU through home cables; the optical splitter in the optical splitter box is at most two detachable and mountable optical splitters to form an adjustable networking structure.

2. The optical access network structure of claim 1, wherein a two-core distribution cable + a plurality of home-entry cables + an optical splitter structure is adopted for networking, and according to the number of end users, a specific networking structure is formed as follows:

the number of users is 2, and the two-core distribution optical cable and the two-core home-in optical cable are directly connected to the ONU;

3. The optical access network structure of claim 2, wherein the optical splitters in the fiber splitting box replace optical splitters with different splitting ratios according to the number of users, so as to meet the capacity expansion requirements of more users.

4. The utility model provides an adjusting method of optical access network structure which characterized in that when the number of users at the end of network deployment increases, according to the number of newly-increased users n, selects the beam split proportion in the beam splitting case to be 1: b, replacing it with a 1: the optical splitter of a, wherein a satisfies: a is more than or equal to b + n.

5. The method for adjusting an optical access network structure according to claim 4, wherein the replacing step comprises:

6. The method for adjusting an optical access network structure according to claim 5, further comprising step S5, resource label specification: and maintenance personnel in each link paste resource information labels in time and ensure that the resource information is accurate.