2 odn design

8/12/2019 2 ODN Design

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HUAWEI TECHNOLOGIES CO., LTD.

www.huawei.com

Huawei Confidential

Security Level:2014/5/30

ODN Design

Prerequisites: The design area must be provided.

The detailed survey must be complete.


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HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 3

This course is intended for beginners of an ODN design.

After completing this course, you should be able to:

Know about types of ODN solutions

Know about the basic flow of an ODN design

Master basic methods of an ODN design

Understand key points of an ODN design


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ODN Solution

Prerequisites of an ODN Design

Flow of an ODN Design

Method of an ODN Design

Principles of an ODN Design

Key Point of an ODN Design


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ODN Solution: FTTC

Copper line

Optical fiber

GPON

Center office

Curb Home

< 1000m3- 5 km

CPE

Outdoor cabinet

ADSL2+

ADSL2+/VDSL2/

POTS

CPE

POTS

GPON

CPE

ADSL2+/VDSL2/

ADSL2+/VDSL2/

Fiber

Fiber


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ODN Solution: FTTH

Center office

Home

GPON

GPON

ONT

PC

TV

Phone

Feeder

optical cable

Distribution

optical cable

Drop cable

3-5 km < 300 m

Fiber P2P

P2P

PC

TV

Phone

PC

Phone


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ODN Solution







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Contents of Work:

Mainly obtains the necessary information and documents for an OND design.

Survey report

Drawings

Design standards confirmed with customer

Software for design, such as Google Earth, Auto CAD, and Microstation


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Survey report

Information about civil work

Information about buildings

User information

Drawings

General topographical map for the planned area

(government)

Sub-area division layout (government)

Communication pipe layout (customer)

Layout of data center, telecommunications rooms

of backbone node, and center offices

(customer/important)

Layout of backbone optical cables and routing

(customer)

Floor plan of the community (resident owner)

Silo and telecom riser layout (resident owner)

Diagram for integrated cable routing inside the

building (resident owner)

Drawings are hard to obtain, so a thorough

survey should be performed for obtaining more

detailed information.


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ODN Solution







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Input:

Survey

information

Customerrequirement

confirmation

Output:

FFTX solution

Splitting solution

Input:

Customer

requirementSolution

Civil work

routing

Output:

BOQ

Input:

Survey information

Communication with

customersOutput:

User bandwidth

Capacity estimation


Solution

SelectionCustomer Requirement

ConfirmationEquipment

Selection

Input:

Survey

informationSolution

Output:

optical cables

route

Civil work route

Output

ODN topology

ODN design

drawingDocuments:

BOQ and ICMS

Route

Selection


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ODN Solution







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Method of an ODN DesignBandwidth

Requirements of Typical Services

VoIP, videotelephony and

videoconference

Internet Application

Additional TV channels (i.e.

2 HD DTV)

HD Digital TV

SD Digital TV

On-line Gaming

Music on demand,

multimedia contents

10 Mbps

20 Mbps

3 Mbps

1 Mbps

2 Mbps

Video

1 MbpsVoice

2 MbpsData

BandwidthService

In the above table, bandwidth requirements of the current typical services are listed. Bandwidth of each user is

determined by user type and negotiation with customers, and then by considering the survey information of

number of users, the total bandwidth (capacity) and split ratio can be determined.
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Method of an ODN Design-Solution Confirmation

Solution Type Application Areas Advantages

FTTC

1. Communities and commercial buildings that are not

constructed Permission of entry to the

household need not be

obtained, and construction

risks are reduced.

2. Certain new communities

3. Certain communities with multi-story building that

have been constructed

FTTB

1. Commercial buildings and government buildings 1. Permission of entry to the

household need not be

obtained.

2. CAPEX is reduced.2. Apartments with rich copper line resources

FTTH

1. Communities with multi-story buildings (areas where

permission of entry to the household is easy to obtain)

The real FTTH is achieved.2. Commercial buildings and high-rise apartments with

deficient copper line resources.

3. Majority of villas

A proper solution is determined after taking into consideration the construction difficulty (including obtaining the

permission of entry to the household) and investment budget of customers.


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CO

Centralized splitting

Method of an ODN Design-Splitting Solution

Confirmation

Optical splitter

Optical splitter

Distributed splitting

CO

This optical cable is alternative in

straight through or splitting once

before.


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Method of an ODN Design-Splitting Solution

Confirmation

Splitting Mode Concept Advantage Disadvantage

Centralized

splitting

Splitters are placed in a centralized

manner. Generally, in centralized

splitting, 1-level splitting is adopted.

Centralized management,

less splices, less link loss,

low maintenance cost

Hard to expand

the capacity

Distributed

splitting

Splitters are widely distributed, and

splitting close to the user end is

installed in closure. Distributed

splitting may not necessarily be 2-

level splitting.

1. Easy for future expansion

2. Relatively small

investment

1. Hard for

management

2. High

maintenance

cost

Huawei recommends centralized splitting; however, for customers with

limited investment, distributed splitting is recommended.


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Method of an ODN Design-Protection Scheme

Type A feeder cable protection

IFpon

IFpon

IFpon

1:N optical splitterOLT

ONU#1

ONU#NBackup opticalcable

Protection area

Type B OLT ports backup

IFpon

IFpon

IFpon


ONU#1

ONU#NIFpon

Protection area

Type A

The equipment is not configured with

the backup function.

If the backbone optical fiber is faulty,switch to the backup optical fiber

manually.

Services are interrupted, and the

interrupt duration is determined by the

cable recovery duration.

If the cable to the user is faulty,

services are interrupted and backup

operation cannot be performed.

Type B

The OLT provides two GPON ports.

Protection is implemented only in the

case that the system automatically

switches to the standby system when

the backbone optical fiber is faulty. This

implements the protection for the

backbone optical fiber.

Only the optical fiber between the OLT

and the ONU, and the OLT board

hardware are protected.


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Method of an ODN Design-Protection Scheme

IFpon

IFpon

IFpon


ONU#

1

ONU#

N

Type C full protection

IFpon

IFpon

IFpon2:N optical

splitter

Full protection

IFpon

IFpon

IFpon

2:N optical

splitterOL

T

ONU

#1

ONU

#N

Type D hybrid

protection

IFpon

IFpon

2:N optical

splitter

1:2 optical

splitter

1:2 optical

splitter

Full protection

Type C

Protection is the type of the optical fiber

switchover on the entire network. Two different

routes exist between the OLT and the ONU. This

ensures line recovery from various faults.

When the ONUs active PON port or the

subscriber line is faulty, the ONU automatically

switches services to the standby PON port. Then,

services are transmitted through the standby line

and the OLTs standby port. In this manner,

services are not interrupted.

Type D

The OLT provides two ports. The ONU can

use either of the PON ports.

Two routes exist between the OLT and the

ONU to protect the entire network, and

services can automatically be switched to the

backup route in case of a fault.

This protection scheme is difficult to

implement and is of high cost.


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Method of an ODN Design-Dual-homing Protection

Mode for the OLT

ONT #1

EMS

ONT #N

OLT A

OLT B

ONT #2

Optical splitter

Working interface

Standby interface

launching

No launching

ONT #1

EMS

ONT #N

OLT A

OLT B

ONT #2

Optical splitter

launching

Alarm to EMS

Open the standby

interface

The EMS configures

the GPON working

interface and standby

interface.

The working interface

works but the standby

interface does not work.

If the working interface is

powered off, an alarm is

generated. Then, the standby

interface works as the

working interface under

the control of the EMS.

Working interface

Standby interface


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Method of an ODN Design-Routing Selection

(Without Use of the Existing Pipes)

FTTX solution

Splitting solution Optical cable

routing

Survey information

Survey information

Civil work routing

Routing design should take the following into account: whether itfacilitates (special topography such as a river or a bridge)

construction; whether it is easy to obtain the construction

permission; whether the existing pipes can be re-used; whether

pipes need to be leased.


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f O S


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Method of an ODN Design-Equipment Selection

FATseries

Cable/Closure

series

Connector

series

FDT

ATB

FDT

series

Optical

spl i t ter

series

Indoor Wall-mounted Outdoor Splitter

Indoor FAT

Indoor Rack-mounted

Outdoor FAT

TB/ATB

seriesTB

Optical cable

Splice Unit

Closure

Pigtail Adapter Patch cord Mechanical splicer FA connector

Flexible optical

cable

ODFODF

series

Integrated Splice &

Termination UnitODF

FDT FDT

Modular Splitter

Integrated splicing

and termination

unit

Cabling unitcable entry unit Base

Principles of selecting a device: reserve certain margin for future capacity expansion

Huawei's

ODN

products


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Method of an ODN Design-Equipment SelectionTo select a device, consider the following:

Equipment functions Equipment features (such as humidity and temperature)

Customers may not purchase Huawei's equipment. In this case, equipment is selected

according to ODN design.

For example, customers require a device (similar to Huawei's FDT) that has the following

functions :

Fusion splicing and distribution cables functions.

More than 500 lines.

Adaptation to the environment higher than 40C.

The cabinet can be opened and closed 1000 times.

According to above requirements, request customers to specify an equipment vendor to

check whether there is a device meeting these requirements.If there is no such a device,

check whether there are similar devices. If the similar devices do not exist, check whether

such a device can be customized (involving price) or modify the ODN design.

Generally, the equipment vendor can

provide the required devices and the

ODN design need not be modified.


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ODN Solution







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The ODN design is mainly used to instruct construction. Therefore, the obtainment

of permission of road rights and entry to the household is very important, which

affects construction process and cost.

A major principle of an ODN design is to easily obtain construction permission or to

try not to involve the construction permission in designing a route.

Easy to obtain construction permission

How much is the investment? ---According to customers' budget, design different

ODN solutions.

How long does the construction last? ---Customers require the construction is

complete as quick as possible and then services can be provisioned for profits.

Therefore, construction difficulties should be considered in designing an ODN

solution.

Meets customers' requirements


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ODN Solution







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Key Points of an ODN Design- Link Loss

ITU-T G984.2 defines the range of class B+ link loss from the OLT to the ONU as 13 dB to 28 dB.

The actual power budget is 24.05 dB to 32.5dB.

In the link budget, 4 dB to 5 dB are reserved for future maintenance.

Sometimes

0.3 or 0.4Name Average Loss (dB)

Connection Point Adapter 0.2

Mechanical splicer 0.2

Fusion splicing point 0.1

Optical splitter 1:64 19.7

1:32 16.5

1:16 13.5

1:8 10.5

1:4 7.2

1:2 3.2

Optical cable (G.652) 1310 nm 0.35/km

1490 nm 0.25/km

1550 nm 0.21/km


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Key Points of an ODN Design-Link Loss

Splitter

Splitter unit

Patch

cord CableCable

FDT frame

Integrated splicing &

termination unitIntegrated splicing &

termination unit

Pigtail

PigtailPatchcord

Splitter

Splitter unit

PigtailCable

Integrated splicing & termination unitOLT

Patch cordPatch Cord

Cabling unitCable entry unit

Adapter

Splicing JointAdapter Patch cord Pigtail cord

The left figure shows

the connection from

the OLT to the ODF.

Here, the ODF

contains an optical

splitter.

The left figure shows

the connection from

the optical cable to

the FDT. Here, the

FDT contains anoptical splitter.


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Connection from the optical

cable to the FAT

Cable

SpliceCable

FAT

Cable

TB

Connection from the

optical cable to the TB

Cable

ATBONU

Splicing JointAdapter Patch cord Pigtail cord

Connection from the optical cable

to the ATB and to the ONU


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Loss Type Quantity Average Loss

(dB)

Total Average Loss (dB)

1:64 1:32 1:16 1:8 1:4 1:2

Optical cable (G.652)(km) 20 0.35 7 7 7 7 7 7

Adapter 9 0.2 1.8 1.8 1.8 1.8 1.8 1.8

Mechanical splicer 0 0.2 0 0 0 0 0 0

Fusion splicer 6 0.1 0.6 0.6 0.6 0.6 0.6 0.6

Opticalsplitter

1:64 1 19.7 19.7

1:32 1 16.5 16.5

1:16 1 13.5 13.5

1:8 1 10.5 10.5

1:4 1 7.2 7.2

1:2 1 3.2 3.2

Total average loss of different branch (dB) 29.1 25.9 22.9 19.9 16.6 12.6

This table presents the calculation of link loss with 1-level optical splitting (splitting at FDT). In

the link, no mechanical splicing is used for cable connection.

K P i t f ODN D i D t i i


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Key Points of an ODN Design-Determining

Optical Fiber Cores (OFCs)The number of OFCs is mainly determined by the subscriber quantity.

The OFC of the drop cable is determined by the subscriber quantity of each

apartment (house).

The OFC of the distribution cable is determined by the subscriber quantity in an

area or building.

The OFC of the feeder cable is determined by the total subscriber cables in the

planned area.

OFC Selection Guide:


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FDT can be located

here.

The mainstream FDT of Huawei supports 512 subscribers. In the planning, one FDT is

planned to cover 350 to 450 subscribers, with certain margin left for future capacity

expansion.

The FDT is located outdoors; therefore, the position of FDT installation is to choose that

there is no need or it is easy to gain permission for FDT installation, and also FDT

installation does not affect ambient traffic.

The FDT is preferred to be installed beside the

original copper distribution terminal.

Key Points of an ODN Design-Determining FDT

Location


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Example-ODN Design for Customer A

Context

1. Customer A provides an area of 2.4 km2(marked in red).

2. Customer A provides the POP point (CO).

3. No pipe resources are available.

In this context, Huawei needs to provide an ODN design.

Design Input Survey Information (Subscriber Model)


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Design Input-Survey Information (Subscriber Model)

No. Subscriber TypeBuilding

Quantity

Subscriber

Quantity per

Building

Terminal

Quantity per

Building

Terminal

QuantityChosen ONT

1 Hotel 6 - 1 6 SRG

2 Bank 2 - 1 2 SRG

3 Hospital 1 - 1 1 SRG

4 School building 12 - 1 12 MA5620G

5 MALL 9 90 2 18 OT928

6 Apartment (FTTH) 15 30 30 450 HG810/HG850

7 Business building (FTTH) 17 8 8 136 OT928/OT925

8Mixed business building

(FTTH)17 90+30 32 544

HG850a/HG866 for

residential;

MA5620G for business

9 Apartment (FTTB) 16 30 1 16 MA5651

10Mixed business building

(FTTB for the residential)63 90+30 3 189

MA5651for residential;

MA5620G for business

Total 158 - - 1,374 -


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Subscriber/Service Type

Service type

Voice

Data

IPTV

Subscriber type

Residential subscribers

Business subscribers

VIP subscribersFor details, see page 14. Assuming thatsubscriber services are provisioned at the

same time, the 26 Mbit/s bandwidth is

required. Therefore, 1:64 split ratio meets

the service requirements.


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Sub-FDT Division

Part 1 Part 2 Part 3 Part 4

Subscriber

Quantity261 489 434 190

FDT No. FDT-1 FDT-2 FDT-3 FDT-4

According to the survey information about future service expectation, four

sub-FDT areas are divided.


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Compared with solution 1 (adopting one optical cable), solution 2

(adopting two feeder optical cables) requires higher cost (doubled

feeder cables and pipes) but has no obvious advantage.

Dual-homing Protection (Solution 2)

Closure

FDT

48-core feeder cable

24-core optical cable

ODF

(S )


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In this solution, the cost is higher, as the optical cables, pipes,

and trenches are doubled.

Protect the feeder cable and PON ports

Dual-homing Protection (Solution 3)

Closure

FDT

48-core feeder cable

24-core optical cable

ODF


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Example-ODN Topology

This figure shows the

ODN topology

designed in the initial

planning, without

considering the dual-

homing protection.


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Example-drawing of ODN Design

Note: This drawing shows the routing of pipes, feeder cables, and distribution

cables of FDT1, and does not show the routing of the other three FDTs.


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Example-drawing of ODN Design


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Example-BOQ

The bill of quantity

(BOQ) template can be

slightly changed

according to different

customer' requirements.


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Example-ICMS

The integrated customer management system (ICMS)

is an ODN routing table from the CO to the ONU.


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Thanks!

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