ETSI TR 103 775 V1.1.1 (2021-08)

Access, Terminals, Transmission and Multiplexing (ATTM); Optical Distribution Network (ODN) Quick Construction and Digitalization

DTR/ATTM-0252

General Information

• Status: Not Published
• Technical Committee: ATTM AT2 - Infrastructure, Physical Networks & Communication Systems
• Current Stage: 12 - Completion
• Due Date: 10-Aug-2021
• Completion Date: 04-Aug-2021

Standards Content (Sample)

ETSI TR 103 775 V1.1.1 (2021-08)






TECHNICAL REPORT
Access, Terminals, Transmission and Multiplexing (ATTM);
Optical Distribution Network (ODN)
Quick Construction and Digitalization

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2 ETSI TR 103 775 V1.1.1 (2021-08)

Reference
DTR/ATTM-0252
Keywords
access, digitalized, pre-connectorized, quick ODN

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ETSI

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3 ETSI TR 103 775 V1.1.1 (2021-08)
Contents
Intellectual Property Rights . 4
Foreword . 4
Modal verbs terminology . 4
Introduction . 4
1 Scope . 5
2 References . 5
2.1 Normative references . 5
2.2 Informative references . 5
3 Definition of terms, symbols and abbreviations . 6
3.1 Terms . 6
3.2 Symbols . 6
3.3 Abbreviations . 6
4 Overview of Digitalized Quick ODN . 7
5 ODN Quick Construction . 10
5.1 ODN quick construction method overview . 10
5.2 Pre-connectorized based ODN Network Construction . 11
5.2.1 Drop section pre-connection . 11
5.2.2 Distribution section pre-connection . 11
5.2.3 All ODN sections pre-connection . 11
5.3 Pre-connectorized components and requirements . 12
5.3.1 Components and requirements of drop section pre-connection . 12
5.3.2 Components and requirements for pre-connection of distribution sections . 14
5.3.3 Components and requirements of All ODN sections pre-connection . 15
5.3.4 Basic Performance Requirements for Pre-connectorized passive elements . 16
5.4 Pre-connectorized ODN installation procedure and requirement . 17
6 Digitalized ODN System . 18
6.1 Digitalized ODN Reference Model . 18
6.2 Digitalized ODN Functional Entity . 19
6.2.1 Digital label . 19
6.2.2 Intelligent management terminal . 19
6.3 Intelligent ODN management system. 20
6.4 Digital System Management and O&M . 21
6.4.1 Digitalized ODN management overview . 21
6.4.2 New Device construction . 21
6.4.3 Service provision . 23
6.4.4 O&M . 24
7 Summary and Recommendation . 24
History . 25

ETSI

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4 ETSI TR 103 775 V1.1.1 (2021-08)
Intellectual Property Rights
Essential patents
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pertaining to these essential IPRs, if any, are publicly available for ETSI members and non-members, and can be
found in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to
ETSI in respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the
ETSI Web server (https://ipr.etsi.org/).
Pursuant to the ETSI Directives including the ETSI IPR Policy, no investigation regarding the essentiality of IPRs,
including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not
referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become,
essential to the present document.
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Foreword
This Technical Report (TR) has been produced by ETSI Technical Committee Access, Terminals, Transmission and
Multiplexing (ATTM).
Modal verbs terminology
In the present document "should", "should not", "may", "need not", "will", "will not", "can" and "cannot" are to be
interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
Introduction
Fibre to Everywhere is the vision of the Fifth Generation Fixed Network (F5G). Easy deployment of fibre
infrastructure, fast and flexible ODN network construction and clear, visible and manageable ODN network are the key
to the construction of the new fibre infrastructure. Traditional ODN networking and construction face the following
challenges:
• low construction efficiency;
• high costs and disordered resource management.
Especially in the low density access scenarios, the high deployment cost and low efficiency of optical fibres are more
obvious. The ODN development in the F5G era should be able to avoid the preceding construction problems and
implement flexible networking, fast deployment, visualized and manageable ODN.
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5 ETSI TR 103 775 V1.1.1 (2021-08)
1 Scope
The present document describes the ODN quick construction and digital management solutions, which enable the
carriers to improve the fibre deployment efficiency, achieve digital resource management, and consequently improve
the operation and management efficiency.
The present document describes the system structure of the digitalized quick ODN and the general requirement of
pre-connectorized ODN product modules, digital labels, intelligent management terminals and intelligent optical
distribution network management systems.
The present document is mainly applicable to the intelligent optical distribution network in access network. It can also
be used as a reference for other networks with optical fibre connections.
The present document is mainly based on intelligent optical distribution networks that can collect the ODN information
through a smart terminal device (such as a smart phone with the ODN management application) and the digital label in
the ODN device. For optical distribution networks that collect electronic label information in other methods, it is
possible to refer to the present document similarly.
2 References
2.1 Normative references
Normative references are not applicable in the present document.
2.2 Informative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] IEC 61300 (all parts): "Fibre optic interconnecting devices and passive components - Basic test
and measurement procedures".
[i.2] IEC 61753-1: "Fibre optic interconnecting devices and passive components - Performance
standard-Part 1: General and guidance".
[i.3] IEC 60068-2-17: "Basic environmental testing procedures - Part 2-17: Tests - Test Q: Sealing".
[i.4] ISO 1998-1:1998: "Petroleum industry-Terminology- Part 1: Raw materials and products".
[i.5] EN 590:2009: "Automotive fuels-Diesel-Requirements and test methods", (produced by CEN).
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6 ETSI TR 103 775 V1.1.1 (2021-08)
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the following terms apply:
digitalized Optical Distribution Network (ODN): methodology that uses electronic labels to uniquely identify ODN
passive elements to enable the implementation of intelligent management functions such as automatic storage of optical
fibre information, automatic identification of optical fibre connection, information on calibration of optical fibre
resources and visualized onsite operation guide
intelligent management terminals: portable devices that provide management GUIs and visualized onsite operation
instructions and provide transmission channels for digitalized ODN facilities to access the digitalized ODN
management system
pre-connection optical distribution network: ODN network deployment methodology that uses cables, block
terminals and other components that are pre-manufactured in factory with connectors and adapters, enabling that the
network connections can be done by plug-and-play operation on site
3.2 Symbols
Void.
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
APC Angled Physical Contact
APP Application
DQ ODN Digitalized & Quick Optical Distribution Network
DQ Digitalized & Quick
EN European Norm
FAT Fibre Access Terminal
FDT Fibre Distribution Terminal
FTTH Fibre To The Home
FTTX Fibre To The X
GIS Geographic Information System
GUI Graphical User Interface
HC Home Connection
IL Insertion Loss
LC Lucent Connector
O&M Operations and Maintenance
ODF Optical Distribution Frame
ODN Optical Distribution Network
OLT Optical Line Terminal
OMS ODN Management System
ONT Optical Network Terminal
ONU Optical Network Unit
OPEX Operating Expenses
OSP Outside Plant
OSS Operation Support System
P2P Point to Point
PON Passive Optical Network
QR code Quick Response code
QR Quick Response
RH Relative Humidity
RL Return Loss
RT Room Temperature
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7 ETSI TR 103 775 V1.1.1 (2021-08)
SC Standard Connector
SN Serial Number
SSC Splitting and Splicing Closure
SUS304 Stainless Steel 304
UPC Ultra Physical Contact
UV Ultraviolet
4 Overview of Digitalized Quick ODN
FTTH has been recognized by the majority of fixed network operators worldwide as a strategic approach for the
deployment of broadband access. Every year tens of millions of fibre access ports are deployed. The most popular
technology for FTTH is Passive Optical Network (PON) which is based on a point-to-multi-point Optical Distribution
Network (ODN). As the infrastructure of FTTH, ODN consumes the biggest part of investments from operators in
constructing its FTTH network; it also takes long time for the construction and significant OPEX costs for operation
and maintainance. Hence, a solution to build and operate an ODN quickly and efficiently with low cost is very
important for every FTTH operator.
A typical ODN contains fibres, cross-connecting and splitting devices such as Optical Distribution Frame (ODF), Fibre
Distribution Terminal (FDT), Splitting and Splicing Closure (SSC) and Fibre Access Terminal (FAT). Its topology and
components are illustrated below in Figure 4-1.

Figure 4-1: ODN Network Structure in FTTx Scenario
The ODN provides a physical optical transmission channel between the Optical Line Terminal (OLT) and the Optical
Network Terminals (ONTs). It usually consists of optical fibre cables/optical connectors/optical splitters and box
equipments for mounting and connecting these devices. During the construction, it generally can be divided into three
parts as shown in Figure 4-1. The first part is the feeder segment, usually from the Optical Distribution Frame (ODF) in
the Central Office up to the Fibre Distribution Terminal (FDT), and serves as the trunk optical cable to realize
long-distance coverage. The second part is the distribution segment from the FDT to the user access point at the Fibre
Access Terminal (FAT) . It allocates optical fibres near the user area along with the feeder optical cable and completes
the optical splitting function. The third part is the drop cable segment, from the FAT to the user premise, and connects
the end users to the ODN network.
The current network construction process can be classified into high-density scenario and low-density scenarios based
on user density scenario.
High-density user scenario: Users live in a densely populated area, where optical splitting is performed at FDTs to
form an even-distributed ODN network architecture. The centralized splitting usually includes one-stage splitting or
two-stage splitting. For one stage-splitting, there is only a high splitting ratio (such as 1:32 or 1:64) splitter in the whole
ODN network. The advantages of one-stage optical splitting are simple network topology, low line attenuation, easy
management and maintenance. Therefore it is usually used in the scenarios where the user's density is very high, such as
the business and residential campuses.
The advantages of two-stages optical splitting are the flexibility of the networking structure and the saving in
distribution cables. Therefore, it is recommended to use two-stages optical splitting for the access of a small group of
users. In the two-stage optical splitting scenarios, the first-stage optical splitter is usually deployed in the central office,
equipment room or optical cable distribution box, and the second-stage optical splitter is implemented near the users.
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Figure 4-2: Centralized optical splitter ODN construction
Low-density user scenario: For users living in sparsely populated areas, the uneven chain networking solution can be
used to deploy the ODN network, to save optical fibre resources. And such solution is also very suitable for the smart
city scenarios, where the network is mainly constructed along the road, for example the ONTs are likely installed on the
street light poles.

Figure 4-3: Uneven chain networking solution
In low-density scenarios, the uneven ratio chain ODN network scheme can make better use of fibre network resources.
In this scheme, compared with the traditional mode that all splitters are equal splitting, uneven splitter is used in the
main chain, and different stages splitter are cascaded by the uneven splitters. Generally speaking, the feeder branch can
be used to connect next stage splitters, and the drop branch can be used to connect the nearest subscribers. All boxes are
connected in series instead of in parallel and this enables the box installation be decoupled from the distribution cable
deployment. Comparing to traditional scenario where boxes are connected with 24/36-core optical fibres, in such
uneven splitting chain all boxes are connected with a single-core distribution cable, which greatly saves the number of
distribution fibres and improve deployment efficiency.
Besides scenario-oriented network deploy mode, network construction efficiency and ODN resource management are
also very important to operators. In the traditional ODN network construction, there are a lot of connections points
which are mainly realized by fusion or mechanical splicing on site. This procedure is very time consuming and also
needs well-trained technicians, which impact the ODN construction efficiency and costs dramatically. On the other
hand, ODN is a pure passive network which does not contain any active parts and therefore the connection relationship
is normally illustrated by paper or plastic labels. After the connection is made, the relationship will be recorded
manually, hence it is prone to mistakes, and label is prone to fall and be damaged as well. Moreover, for ODN
troubleshooting, a technician needs to access the database to retrieve the connection data and to look for the
corresponding labelled fibre. This makes the management and operation of ODN dependent on non-reliable network
data.
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Ways to solve the abovementioned issues are:
1) To reduce or avoid onsite splicing by using plug-and-play devices and fibre cable assemblies, which reduces
time and needs of trained technician and special equipment.
In this method, all ODN passive elements are pre-connectorized. Distribution cables and drop cables with quick
connectors are pre-manufactured in factory and delivered with the system. Outdoor Fibre Access Terminals (FATs) are
equipped with quick connectors and support plug-and-play operation. During the on-site construction, the technician
can quickly complete the network connection by manually inserting and locking the cables, based on the network plan,
which greatly simplifies deployment and improves deployment efficiency.

Figure 4-4: Quick ODN construction based on pre-connectorized passive elements
2) Using more robust digital labels which support being recorded/inquired with digital equipment to avoid
possible human mistakes, and enable that all the ODN parts and network can be managed by the ODN
Management System (OMS).
In this case all ODN passive elements have digital labels for an easy identification, recording and management by the
ODN digital management system. The OMS is able to identify and display automatically the distribution topology
based on the uploaded position information, and manage the ODN resources, provide needed service accordingly. The
labels should be robust and be input/inquired based on digital method.

Figure 4-5: Digitalized ODN devices supported digital label and information automatic collection
The OMS uses the ODN passive element information contained in the digital label, and displays the information of
connection relationship of each device port and the overall link connection topology, and quickly compares the
information with the planning and design solution. In addition, port identification ensures efficient and quick port
utilization and solves the problem of low efficiency and error-prone handling caused by paper labels. The details are
shown in Figure 4-6.
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Figure 4-6: Digitalized ODN Management System
In summary, the Digitalized ODN can help to solve the challenges in traditional ODN construction and maintenance.
The pre-connection ensures that all nodes are pre-manufactured cable assemblies, connectors and splitters. The
pre-connectorized cables are assembled in the factory before delivery and quality control is performed to guarantee the
connection quality and prevent uncontrollable quality problems caused by manual splicing on site. It supports
plug-and-play and allows in parallel construction, thereby increases the construction speed and supports fast and
efficient FTTH deployment. The digital management system implements end-to-end ODN management based on image
recognition and ODN digitalization, achieving accurate resource management, quick service provisioning, and
improving network O&M efficiency.
5 ODN Quick Construction
5.1 ODN quick construction method overview
Pre-connectorized ODN passive elements are a solution for FTTH infrastructure network architecture that enables a
high efficiency network construction, high reliability and low deployment costs. Pre-connection ensures that the
network passive elements are pre-manufactured with INGRESS PROTECTION (e.g. IP65, IP68) connectors and
adapters. Before shipped from the factory, all network passive elements have been terminated with connectors and
adapters, with an assured quality level and suitable for a variety of ODN network environment. Compared to the
traditional ODN network, pre-connectorized ODN construction eliminates needs of fibre splicing on site, thus avoids
issue of lacking of control and potential inefficiency of fibre fusion splices. At the same time, using this quick
installation process and depending on the network structure, the construction mode can be changed from the typical
serial construction into a parallel construction mode using several crews, supporting the quick and efficient deployment
of ODN.
In simple words, a pre-connectorized based ODN solution is very efficient for ODN construction. Based on the ODN
network planning, designing and coverage range, pre-connection can be applied into drop section pre-connection,
distribution section pre-connection, and all ODN sections pre-connection. In all these options, the key is to have
pre-connectorized passive elements and transfer the manual fibre splicing work onsite to the factory for batch
processing and higher reliability.
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11 ETSI TR 103 775 V1.1.1 (2021-08)
5.2 Pre-connectorized based ODN Network Construction
5.2.1 Drop section pre-connection
The drop section is the path from the last distributing point, usually the point of stage-2 optical splitting, to the user
premises. In this clause, the traditional ODN fibre access terminal splicing operation on the stage-2 optical splitting
FAT node is replaced with pre-connectorized cable assemblies, prefabricated in the factory, effectively improving the
construction efficiency of the Home Connection section and implementing plug-and-play deployment.

Figure 5-1: Drop section pre-connection network architecture
5.2.2 Distribution section pre-connection
Cascaded unevenly distributed splitters can be used in the distribution section. Small-diameter single-core or dual-core
distribution cables are used to implement cascading between Hub boxes and Sub boxes. This solves problems such as
large diameters, difficult deployment, high costs, and time-consuming deployment of common 12-core or 24-core
distribution cables. The pre-connection architecture that introduces the concept of pre-connection from the distribution
section can be summarized as pre-connection of distribution sections.

Figure 5-2: Distribution section pre-connection network architecture
5.2.3 All ODN sections pre-connection
The feeder, distribution, and drop cable assemblies from the OLT are prefabricated without need of splicing on field
and are plug-and-play on the entire network. This type of architecture that introduces the concept of pre-connection
from the feeder section can be summarized as full-process pre-connection.
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Figure 5-3: All ODN se
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