Transcript GPON FTTH MARKETING AND TECHNOLOGY

GPON FTTH MARKETING
AND TECHNOLOGY
Antony Pius KG
S7, ECE
Govt. Engg. College, Wayanad
Introduction
•
Gigabit PON is an attractive FTTH broadband access network technology
because it meets theneeds of carriers world-wide.
• GE-PON (EPON) has successfully demonstrated this approach and is
being deployed in high volume in Asia.
•
while the GPON standard will provide similar capabilities for carriers in North
America.
•
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,
•
a set of features ready to offer those services and an infrastructure of silicon,
and system vendors that are capable of developing and deploying gigabit
PON technology.
COMPARISON OF PON WITH OTHER BROAD BAND
ACCESS TECHOLOGIES (DSL,VDSL, cable/modem)
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)
.
PON A SIMPLE VIEW
• In a PON system, a single fiber connects
multiple customers toa 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.
PON Network Splits Single Fiber Link Into Individual Links to Subscribers
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The FTTH Access Network – OLTs In The Central Office, ONUs in CPEs
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• The main components of a PON network are an
Optical Line Terminal/Termination (OLT) unit,
a passive optical splitter,
and one or more Optical Network Units (ONUs) or Optical
Network Termination (ONT) units.
• The OLT is connected to the ONU or ONT via a Passive
Optical Network (PON) that is made up of fibre cables,
splitters and other passive components
• OPTICAL SPLITTERS
• These devices split incoming light and distribute the light
among multiple fibres, or in the reverse direction
combine multiple light streams onto a single fibre.
• Optical splitters are classified as passive because there
are no active electrical components.
• This means that the device is not sensitive to
temperature or other elements that would be problematic
for electrical componentry.
• The optical splitter can be seen as a optical junction
box. One side of the box is the fibre that connects to the
telco exchange (OLT), and on the other side are up to 64
fibres, each of which connect to a customer premise
• ONT/ONU(optical network termination/optical network unit)
• Optical Network Termination units (ONTs) provide the opto-electrical
conversion - allowing information to transit from an optical fibre
framework to an electrical metallic framework.
• ONTs can be thought of as the demarcation point where the carrier
network ends and the customer network begins. From a physical
perspective the carrier fibre connects to one end of the device, and
a customer cable on other end
• ONUS terminate the optical stream, and convert the signal into
electrical format for transmission to the customer premise
• ONUs would tend to be located in weather reinforced street/pole
cabinets, and ONTs would be located at customer premises
• OLT
• OLTs can be located in a number of
places, but would tend to reside in telco
exchanges
• The PON architecture therefore allows a
single fibre starting at the OLT (telco
exchange) to be passively split (shared) by
up to 64 customers
DATA SPLITTING IN THE PON NETWORK
• One side of the box is the fibre that connects to the telco
exchange (OLT), and on the other side are up to 64 fibres,
each of which connect to a customer premise.
• The sharing takes place on the fibre which connects to
the OLT, whereas the fibres that connect to the customer
premises have dedicated bandwidth.
• The actual bandwidth allocated to each customer would
depend on two technical factors:
1) the capacity of the link from the OLT to the splitter, and
2) the number of customers connected to the splitter (eg.
up to 64). With a 10 Gbps OLT-splitter capacity, and 64
customers, it is conceivable that each customer could
have up to 155 Mbps dedicated capacity. Of course, in
the real world, carrier pricing would also have an impact
• Fibre sharing can be accomplished along frequency, time, space
and code dimensions
•
Most commonly used optically signaling formats are techniques are
WDM/WDMA (Wavelength Division Multiplexing /wavelength
division multiplexing access) and TDM/TDMA.
• With WDM/WDMA, multiple streams are transmitted over
distinct wavelengths at the same time.
• With TDM/TDMA, transmissions proceed in a time sequenced
manner - similar to leased line networks.
Comparison of DSL, Cable and FTTH Technology Bandwidth
HOW PON WORKS
• An eg: of giga pon architecture my a company is
analysed
• The Giga PASS approach encompasses three
technology platforms,
• the PON network interface and processing,
• IP and Ethernet packet processing and an SoC
architecture that supports a 32-bit RISC processor with
Linux and VxWorks operating systems,
• middleware, and application specific firmware.
• This architecture is capable of supporting both GE-PON
and GPON data
• Data rates ranging from 1 to 2.5 Gbps at wire speed and
provides a flexible, programmable and upgradeable
device architecture well suited for future-proofing the
access network.
The GigaPASS™ Architecture Provides Wire Speed Access at
Gbps Speeds
• A critical aspect of the GigaPASS architecture is
that the data path is separate from the
controlpath processor system.
• The media interface, queuing, packet
processing, classification,encryption/decryption
and other data payload processing is done in the
wire-speed channel.
• passing data through to the Ethernet media
interface on the customer side and the PON
network on the central office side.
• PON networking is a full duplex, point to
multipoint networking technology that uses
inexpensive optical splitters to divide a single fiber coming from the
backbone of the enterpriseor metro network into separate strands
feeding individual subscribers in the access network.
FUTURE OF FTTH
• Carriers cannot easily predict what applications will be critical for
consumers and business users in five years but an important part of
the appeal of FTTH accessnetworks is that they will provide ample
bandwidth for 5, 10 and even 20 years or more.
• Instead of a limited hardware solution, the GigaPASS architecture
supports reprogramming of functionality so thatcarriers can fine-tune
the OLT/ONU for specific subscriber services today, and can
redefine performance parameters to support future applications.
• An example of this is support for Dynamic Bandwidth Allocation or
DBA.
• Programmable DBA is defined in the GPON specification and calls
for the ability to 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.