Transcript GPON 1

Understanding GPON
By
Adnan Umar
PTCL Academy
Objectives
• At the end of this module participants will
be able to:
– List the benefits of FTTH
– Understand the PON
– Understand the GPON architecture
– Describe the key features of GPON
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Copper Based Access Networks
• Optimized for a single
service
• Can support data rates
20+Mbps
• Future demand for next
generation services is
40+Mbps
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Source:
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Think of a technology --- having
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Unlimited bandwidth
Future proof
Long distance coverage
Can support bandwidth hungry
multimedia services over IP
– i.e. VOIP, HDTV, VOD, access to HSI
etc. involving
• (voice + video + data)
– All services via bundle offering
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FTTH
100 % fiber in AN
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FTTH?
Copper
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Fiber
CO/HE
CO/HE
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Old networks, optimized for voice
24 kbps - 1.5 Mbps
CO/HE
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Optical networks, optimized for voice,
video and data
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19 Mbps - 1 Gbps +
FTTH – 100% Fiber Network
• “An OAN in which the ONU is on or within the customer’s
premise.”
– OAN: Optical Access Network
– ONU: Optical Network Unit (CPE)
– OLT:
Optical Line Termination
OAN
CO/HE
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OLT
Source: www.ftthcouncil.org
ONU
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FTTH Active Network
OLT
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ONU
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Processing
(powered)
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FTTH Passive Optical Network
OLT
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Optical splitter
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1x16 (1x2, 1x8)
1x32 (1x4, 1x8)
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Hybrid Networks
OLT
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Processing
(powered)
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Optical splitter
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FTTH network realizations
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Active networks
– Subscribers have a dedicated fiber optic strand
– May use active (powered) nodes to manage signal
distribution
All passive network
– Shares fiber optic strands for a portion of the
networks distribution
– Uses optical splitters to separate and aggregate the
signal
– Power required only at the ends
Hybrid networks
– Literal combination of an Active and a PON
architecture
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FTTH Standards
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FTTH - STANDARDS
• ITU-T G.983
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APON (ATM Passive Optical Network).
First Passive optical network standard.
Used primarily for business applications
was based on ATM (Asynchronous Transfer Mode)
Initial offering 155.52 Mbps Downstream, 155.52 Mbps
upstream.
– BPON (Broadband PON)
• Standard based on APON architecture.
• It adds support for WDM, dynamic and higher upstream
bandwidth allocation.
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FTTH – STANDARDS -cont
• ITU-T G.984
– GPON (Gigabit PON)
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An evolution of the BPON standard.
Supports higher rates,
Enhanced security,
GPON uses IP-based protocols to transfer data.
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FTTH – STANDARDS-cont
• IEEE 802.3ah
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EPON or GEPON (Ethernet PON) is an IEEE/EFM standard for using
Ethernet for packet data.
There are currently over 15 million installed EPON ports.
EPON uses IP-based protocol to transfer data.
- 1.25 Gbps Symmetrical.
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