Transcript ONT - BSNL Durg SSA(Connecting India)

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FTTX
Future of FTTH
PON a Simple view
Types of PON
GPON Overview
Fundamentals of GPON
PON advantage
Comparison Of PON With Other Broadband Access
Technologies
•FTTX is of 4 types:
•FTTH: Fiber To The Home
•FTTB: Fiber To The Building
•FTTC: Fiber To The Curb
FTTH
•FTTN: Fiber To The Node
•WHY CHOOSE FIBER?
FTTC
Superior Performance
2. Ease of Installation
3. Easy to Upgrade
4. Smaller size and lighter weight
1.
FTTx
FTTN
FTTB
 FTTH access networks will provide ample bandwidth for 5, 10
and even 20 years or more.
FTTH can redefine performance parameters to support future
applications.
An example of this is support for Dynamic Bandwidth
Allocation or DBA.
FTTH provide different bandwidth priorities to subscribers so
that different application service requirements can be supported.
For example, it may be critical for high-definition IP TV to
have priority download of a time-sequenced video frame and not
so critical for a user accessing email. All GPON suppliers must
have programmable DBA.
•In a PON system, a single fiber connects
multiple customers to a single transceiver at
the central office (CO).
•The single fiber is split, using a passive
optical splitter, to serve up to 32customers.
• Not only does PON reduce the amount of
fiber required, but a single transceiver serves
multiple customers instead of requiring one
per customer.
Passive Optical Network.
 Facilitates another (higher bandwidth) broadband access technology
Competes with and complements xDSL, cable modem and fixed
wireless
With a PON, optical fiber is deployed either all the way or almost all
the way to the end user (VDSL)
 Passive because
–- network only consists of passive light transmission components
(fiber
links, splitters and couplers)
–- This creates great cost savings for the provider (more reliable and
less
costly to operate/troubleshoot)
PONs use a Point-to-Multi-Point (P2MP) topology
ODN – Optical Distribution Network
– An ODN realizes the optical transmission from the OLT towards
the users and vice versa. It utilizes passive optical components.
OLT – Optical Line Termination
– An OLT is the service provider endpoint of a PON and is placed in
a CO or head end
 ONT – Optical Network Termination
– An ONT is a device that terminates the PON and presents native
service interfaces to the user. An ONT is typically located on the
customer’s premises.
 ONU – Optical Network Unit
– An ONU is the PON-side half of the ONT, terminating the PON,
and may present one or more converged interfaces, such as xDSL
or Ethernet, toward the user. An ONU typically requires a separate
subscriber unit to provide native user services such as telephony
telephony,
Ethernet data, or video.
There are various types of PONs. The general
technology is the same. The differences are in the
specifications and upper layer protocols.
– APON – ATM based PON uses ATM encapsulation of the
transported data.
– BPON – Broadband PON succeeded APON and also uses
ATM encapsulation. Supports superior features, higher
speeds and was standardized by the ITU-T.
– EPON or GE-PON – Ethernet PON uses Ethernet for
data
encapsulation. Standardized by the IEEE in mid-2004.
-GPON or Giga PON – Gigabit PON uses a new Generic
Encapsulation Method (GEM) transport layer that supports
ATM, Ethernet and TDM data transport.
GPON 2,5GB
EPON
1,25GB
1000
SPEED [MB/s]
BPON 622MB
APON 155MB
100
PON
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54MB
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YEARS
2002
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2008
Gigabit PON is an attractive FTTH broadband access network
technology because it meets the needs of carriers world-wide.
GE-PON (EPON) has successfully demonstrated this approach and is
being deployed in high volume in Asia.
It is an access method transported by optical fiber, FTTx.
Is a point to multipoint access, one central point can
reach from 32 to 128 premises. There are only two types
of equipments the OLT (central) and the ONT’s (in
customer premises)
It includes all of the ingredients for market success –a consumer
base that is eager to adopt a much faster and more
comprehensive set of high-speed
services,
Optical Line
Terminal(OLT)
Optical
Splitter
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The Optical Line Terminal (OLT)
• Acts as the central aggregation element.
• Located in the Core Data Center.
• Replaces multiple L2 switches.
• Can aggregate thousands of end users.
Optical Line
Terminal(OLT)
Optical
Splitter
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Passive Optical Network (PON)
• Completely passive infrastructure
• Single fiber (32:1)
carries multiple wavelengths
• 2.48 Gbps downstream
• 1.24 Gbps upstream
Serve Remote Bldgs Up to 20Km
Optical Line
Terminal(OLT)
Optical
Splitter
ONT
(32:1)
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Passive Optical Splitter Feeding FDH
•Rack Mount or Cassette versions
• Splits single fiber up to 32 ways
• Can be located in the IDF/TR, under a raise floor, in a ceiling zone box,
or in a manhole.
• The further the splitter is extended to the desk,
the greater the savings in fiber infrastructure .
Optical Line
Terminal(OLT)
Optical
Splitter
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Optical Network Terminals (ONT)
• Terminates the fiber at the end user
• Provides Data, VoIP, IP Video services
• Some models also provide native POTS
• Desktop and MultiDesk Unit models
shared infrastructure translates to lower cost per customer
• minimal number of optical transceivers
• feeder fiber and transceiver costs divided by N customers
• Greenfield per-customer cost similar to UTP
passive splitters translate to lower cost
• can be installed anywhere
• no power needed
• essentially unlimited MTBF
fiber data-rates can be upgraded as technology improves
• initially 155 Mbps
• then 622 Mbps
• now 1.25 Gbps
• soon 2.5 Gbps and higher
Edge Switches vs. Passive Fiber
Splitter
ADVANTAGES
These include a long-term life expectancy of the fiber
infrastructure,
lower operating costs through the reduction of “active
components, support for greater distances between
equipment nodes
most importantly, much greater bandwidth.
DSL-certain megabits per sec, FTTH pon 1 to 2.5Gbps
Since Pon uses only passive components
• it has low power requirements
• less no of technicians
• cost savings up 40 t0 60%
• Savings mainly result from lower customer
contacts associated with service orders and
trouble reporting, outside plant operations,
central office operations, and network operations.
It provides high bandwidth for high-speed Internet
access, video on demand,IPTV and voice over IP (VoIP)
.