2. FTTH Basics and Network Design OFS – Boxer, Bush
Agenda
• Drivers for FTTH
• Why Fiber?
• Fiber Feeds Everything
• Nuts and Bolts - The Components
• Installation Techniques
• Network Architectures and Planning
2
3. FTTH Basics and Network Design OFS – Boxer, Bush
Bandwidth – then, now, and next
3
≈ 0.6 kbps
Then
2 Mbps
25 Mbps
1.5 Mbps
9 Mbps
6 Mbps
Now
Next
VR >
500 MBPS
4. FTTH Basics and Network Design OFS – Boxer, Bush
Agenda
• Drivers for FTTH
• Why Fiber?
• Fiber Feeds Everything
• Nuts and Bolts - The Components
• Installation Techniques
• Network Architectures and Planning
4
5. FTTH Basics and Network Design OFS – Boxer, Bush
Why Fiber?
Greater Bandwidth, Longer Distance,
Lowest Cost / Bit
Bandwidth Distance Cost per Bit
Copper
Bandwidth Distance Cost per Bit
Fiber
2,400 Pair Copper
Cable
100 Gbps to 1KM
1 Fiber Cable
> 50 Tbps
> 5,000 KM
5
6. FTTH Basics and Network Design OFS – Boxer, Bush
Why fiber?
Metal cables and wireless have significant
limitations
• Reliable - Fewer truck rolls with fiber
• Lower power consumption versus DSL/HFC
• Not affected by lightning, rain, humidity issues
• No maintenance needed for amplifiers
Feature Benefit
High
bandwidth
High information carrying
capacity
Low
attenuation
Long distances without
repeaters, less expensive
Light weight
Small size
Easier installations
Unobtrusive
No metallic
conductors
No grounding problems
No “crosstalk”
Passive
No power requirements
No circuit protection
needed
Inexpensive
Widely deployable & cost
effective
6
7. FTTH Basics and Network Design OFS – Boxer, Bush
Agenda
• Drivers for FTTH
• Why Fiber?
• Fiber Feeds Everything
• Nuts and Bolts - The Components
• Installation Techniques
• Network Architectures and Planning
7
8. FTTH Basics and Network Design OFS – Boxer, Bush
Fiber Feeds the Cell Network
• Mobile bandwidth demand, driven by smartphones and video,
is growing rapidly
• Fiber is needed to and up the tower for 4G networks and
beyond
• Fiber has many advantages for cell network operators:
• Weight
• Tower loading/bracing
• Grounding
• Installation time
• Power losses
• Space
• Cooling requirements
Bandwidth
8
9. FTTH Basics and Network Design OFS – Boxer, Bush
Fiber in Telephone and
Cable Networks
• Fiber to the Node, Copper/coax to the home
• Bandwidth variable based on distance, metal cable quality, node size
• Asymmetric bandwidth (more downstream than upstream)
Telephone: FTTN - Fiber to the Curb/Node
Cable: HFC - Hybrid Fiber Coax
12 - 24 fibers
Powered Switch
or Node
Central Office
OLT Twisted Pair
or Coax
Typical Distance Range
9
10. FTTH Basics and Network Design OFS – Boxer, Bush
Fiber Feeds the Power
Network
• Fiber is an integral part of the utility communications network
• Substation to substation communications
• Equipment within substations
• FTTH – Primarily municipalities and co-ops
• Smart grid initiatives are changing the nature of power delivery
10
Transmission Distribution
Nuclear
Renewable
Smart Meter
Micro Grid
--:Information
--:Power
11. FTTH Basics and Network Design OFS – Boxer, Bush
Agenda
• Drivers for FTTH
• Why Fiber?
• Fiber Feeds Everything
• Nuts and Bolts - The Components
• Installation Techniques
• Designing the OSP Network
11
12. FTTH Basics and Network Design OFS – Boxer, Bush
Optical Fiber
Fastest Comms Pipe Available
• Light travels in core and is constrained by the cladding
• Acrylate coating protects pure silica (glass) cladding
Core
Cladding
Coating
Light ray
12
13. FTTH Basics and Network Design OFS – Boxer, Bush
Fiber Structure
• Core - The center of a fiber
– Typically contains dopants to
change speed of light
• Cladding - Outer layer of glass
to contain light
– Different refractive index
• Coating - Cushions and
protects fibers
v
vs
v
125 microns
200-250 microns
8-62.5
microns
Core
Cladding
Coatings
13
14. FTTH Basics and Network Design OFS – Boxer, Bush
Main Fiber Types
Single-mode & Multimode
• Single-mode fiber
– Carries only one mode of light
– Used for the majority of FTTH deployments
• Multimode fiber
– Carries multiple modes of light
Singlemode
Multimode
50-62.5
µm
core
cladding
Index of Refraction Profiles
8-10 µm
125 µm
125 µm
14
15. FTTH Basics and Network Design OFS – Boxer, Bush
Bend Insensitive Fiber
Enables Fiber in Non-traditional Places
15
Small
radius
Service
Disrupted
Small
radius
Conventional
Singlemode fiber
Small
radius
Bend insensitive
Singlemode fiber
Small
radius
Service
Maintained
16. FTTH Basics and Network Design OFS – Boxer, Bush
FTTH Network Macro View
Aerial
Cable
Underground
Cable
Central Office /
Headend
Drop
Closures or
Terminals
Splitter
Cabinet
Drop
Cable
Splice
Closures
Direct Buried
Cable
16
17. FTTH Basics and Network Design OFS – Boxer, Bush
Outside Plant Fiber Cable
• Most often “loose tube” cable structure
–Fibers loose in buffer tubes
• Handles stress/strain and temperature
fluctuations and climatic extremes
–Also available in ribbons
–Fibers and buffers are color coded
• Underground applications
– Direct Buried – typically armored
– Duct cable
• Aerial applications
– Lashed to a messenger
– All-Dielectric, Self-Supporting (ADSS)
Buffer tube
Fiber
Loose buffer tube
structure
Ribbon fiber and cable structure
17
18. FTTH Basics and Network Design OFS – Boxer, Bush
Inside Plant Fiber Cable
• Indoor cables are different than outdoor cables
• Most often “tight buffer” cable structure
–Provides additional protection for frequent
handling
–Easier connectorization
• Multiple types of cable structures
• Riser, plenum, low smoke/zero halogen products
–Designed to meet flame smoke ratings
• Yellow jacket indicates single-mode fiber
18
19. FTTH Basics and Network Design OFS – Boxer, Bush
Fiber Management Devices
Closures, Terminals
• Fiber management devices are used
in the central office or remote
cabinets
• Closures are used in the field to
connect cables and fibers
• Terminals are often used for the
final drop to the home
• Multiple designs available for each
component
19
20. FTTH Basics and Network Design OFS – Boxer, Bush
Connectors and splitters
Splitters
• Used with Passive Optical Network
(PON) systems
• Used to split one fiber into multiple
fibers
– Decreases power
– Splits bandwidth
• Split ratios are powers of 2
– 1x2, to 1x64 (1x32 most common)
LC Connector
SC Connector
20
Splitter Cabinet
Splitter
MPO Connector
(12 fiber ribbon
connector)
Connectors
• “SC” and “LC” most common
• Color indicates polish (back reflection)
• Blue = “Ultra” polish
• Green = “Angle” polish
Splitter in splice tray
21. FTTH Basics and Network Design OFS – Boxer, Bush
MDU and in-home
Deployments
• MDU and in-home installations are
different than outside plant
• Most inside installations require tight
bends and bend insensitive fibers
• Manufacturers have developed fibers
and products for these applications
Fiber
21
22. FTTH Basics and Network Design OFS – Boxer, Bush
Agenda
• Drivers for FTTH
• Why Fiber?
• Fiber Feeds Everything
• Nuts and Bolts - The Components
• Installation Techniques
• Network Architectures and Planning
22
23. FTTH Basics and Network Design OFS – Boxer, Bush
OSP Cable Placement
Options
Aerial
• Fast, minimal restoration time
• Typical choice for overbuilding
existing aerial plant
Below Grade
• Required if no existing aerial
plant
• Aesthetically pleasing!
23
24. FTTH Basics and Network Design OFS – Boxer, Bush
Splicing
Fusion
• Most common type of splice
• Fibers joined together and melted at
approximately 1600 degrees C
Mechanical
• Common overseas
• Less common in US FTTH installations
Splice sleeve to cover
completed splice
Illustration of electrodes used to
form fusion splicing arc
24
25. FTTH Basics and Network Design OFS – Boxer, Bush
Optical Loss Budget
Unmanaged Switch
OLT
Encoder & DVD
Fiber Management
Designers must ensure adequate optical
power going both directions
Component Typical loss values
@ 1550 nm
Fiber 0.2 dB/km
Splices 0.05 dB
Connectors 0.2 dB
Splitters (1x32) 17-18 dB
25
26. FTTH Basics and Network Design OFS – Boxer, Bush
Agenda
• Drivers for FTTH
• Why Fiber?
• Fiber Feeds Everything
• Flavors of FTTx
• Nuts and Bolts - The Components
• Installation Techniques
• Network Architectures and Planning
26
27. FTTH Basics and Network Design OFS – Boxer, Bush
FTTX Network Planning
Establish Ultimate Network Plan
• Ensures incremental additions support
ultimate objectives
Network Plan Objectives
• Reduce installed costs
• Increase speed of network build
• Increase return on investment
o Target network segments based on ROI
• Streamline build cost estimation
process
Example Network Plan
Cable route design for 10k premise network
27
28. FTTH Basics and Network Design OFS – Boxer, Bush
FTTX Architectures
GPON GE-PON
Point to Point
(Active Ethernet)
Current
Gen
Next Gen
Current
Gen
Next Gen
Downstream
Bandwidth
2.4 Gbps
total
10 Gbps
total
1.2 Gbps
total
10 Gbps
total
100 -1000 Mbps
per sub
Upstream Bandwidth
1.2 Gbps
total
10 Gbps
total
1.2 Gbps
total
10 Gbps
total
100 -1000 Mbps
per sub
Typical distance 20 km 20 km 20 km 20 km 20 km
Wavelengths (nm),
Downstream
Upstream
1490
1310
1577
1270
1550
1310
1577
1270
1550
1310
28
29. FTTH Basics and Network Design OFS – Boxer, Bush
FTTX Architectures
• Requires largest cables and most splicing
• Highest cost of electronics per customer
• Maximum bandwidth per customer
Active Ethernet (Active E)
or Point-to-point (P2P)
Central Office
or Powered Cabinet
Electronics
SFU
Business
MDU
Dedicated
Fibers
29
30. FTTH Basics and Network Design OFS – Boxer, Bush
FTTX Architectures
PON - Central Office Splitting
• Requires largest cables and most splicing
• Maximizes OLT port utilization
• Utilized in dense urban deployments
Splitter
F1 Fibers F2 Fibers
Central Office
or Powered Cabinet
OLT
SFU
Business
MDU
Dedicated
Fibers
Shared
Fibers
30
31. FTTH Basics and Network Design OFS – Boxer, Bush
FTTX Architectures
PON - Cabinet Splitting
• Closely resembles copper networks
o Cross connect cabinets
• Limits initial OLT utilization
• Most common method of deployment in U.S.
Splitter
F1 Fibers F2 Fibers
Central Office
or Powered Cabinet
OLT
SFU
Business
MDU
Dedicated
Fibers
Shared
Fibers
Splitter
Cabinet
31
32. FTTH Basics and Network Design OFS – Boxer, Bush
FTTX Architectures
PON - Distributed Splitting
• Greatly reduces cable sizes and splicing
• Requires more OLT ports than CO or cabinet splitting
o Typical break-even take rate is 20-25%
F1 Fibers
Central Office
or Powered Cabinet
OLT
SFU
Business MDU
Dedicated
Fibers
Shared
Fibers
Splitter
Splice
Closures
Splitter
F1 Fibers
SFU
F1 Fibers
32
33. FTTH Basics and Network Design OFS – Boxer, Bush
FTTX Architectures
PON - Cascaded Splitting
• Minimizes cable sizes and splicing
• Ideal for rural deployments
F1 Fibers
Central Office
or Powered Cabinet
OLT
SFU
Business
MDU
Dedicated
Fibers
“S1”
1st Splitter
Splice
Closure
SFU
F1 Fibers
“S2”
2nd Splitter
“S2”
2nd Splitter
Shared
Fibers
Splice Closure
Or Cabinet
33
34. FTTH Basics and Network Design OFS – Boxer, Bush
FTTX Architectures
Distributed / Cascaded Splitting
versus
CO / Cabinet Splitting
Advantages
1. Significantly reduces cable sizes
2. Significantly reduces splicing requirements
3. Eliminates need for splitter cabinets
• Associated permitting
Disadvantages
1. 100% splitter installation
• Initial as opposed to incremental
2. 100% OLT port installation
• Initial as opposed to incremental
Typical break-even take rate is 20-25%
• Greater than 25% - distributed / cascaded more economical
• Less than 20% - CO / cabinet more economical
34
35. FTTH Basics and Network Design OFS – Boxer, Bush
Summary
• Video, internet, and new applications are driving bandwidth increases that
require fiber
• Fiber is the best method for providing low cost, high bandwidth services
• Lowest cost/bit
• Lowest OPEX
• More reliable than metallic technologies
• Lower attenuation, weight
• Fiber architectures include multiple types of PON and point-to-point
• Multiple ways of deploying FTTH
• OSP design decisions have significant impacts on network build costs
35
36. FTTH Basics and Network Design OFS – Boxer, Bush
Thank you for
attending. Please
remember to
complete the online
evaluation of this
session in the mobile
app by selecting the
bar graph icon.
36
37. FTTH Basics and Network Design OFS – Boxer, Bush
Questions?
Mark Boxer
Applications Engineering Manager, OFS
mboxer@ofsoptics.com
252 495-4131
Jeff Bush
Professional Services Manager, OFS
jbush@ofsoptics.com
770 241-4713
Please Complete the Evaluation
37
38. FTTH Basics and Network Design OFS – Boxer, Bush
Backup
Backup Slides
38
39. FTTH Basics and Network Design OFS – Boxer, Bush
FTTX Architectures
Active Ethernet (Active E)
or Point-to-point (P2P)
Electronics
Splice Panel
Customers
OSP
Cable
Jumpers
Factory Installed
Connector
Central Office
or Powered Cabinet
39
40. FTTH Basics and Network Design OFS – Boxer, Bush
FTTX Architectures
PON - Central Office Splitting
Optical Terminal Shelf Mount Splitter Splice Panel
Customers
Jumpers
F1 Fibers
Factory Installed
Connectors
Jumpers
F2 Fibers
OSP Cables
F2 Fibers
Central Office
or Powered Cabinet
40
41. FTTH Basics and Network Design OFS – Boxer, Bush
FTTX Architectures
PON - Cabinet Splitting
OLT
Splice Panel
Customers
OSP Cables
F2 Fibers
OSP Cables
F1 Fibers
Hand Hole
Splitter Tails
Factory
Connectorized
Splitter Cabinet
Splice Closure
Splitters
Central Office
or Powered Cabinet
Cabinet Tails
OSP Cables
41
42. FTTH Basics and Network Design OFS – Boxer, Bush
FTTX Architectures
PON - Distributed or Cascaded Splitting
Service Drop
Connection Point
Aka “terminal”
OLT
Splice Panel
Customers
Splice
Tray
Splitter
Service
Drops Customers
OSP Cables
F1 Fibers
OSP Cables
F2 Fibers
Central Office
or Powered Cabinet
42