3. Introduction
Optical Ethernet is the technology that extends
Ethernet beyond the local-area network (LAN)
and into metropolitan-area networks (MANs) and
wide-area networks (WANs).
While Ethernet LANs are almost exclusively used
within the enterprise, optical Ethernet technology
can be used as a service provider offering.
They combine the flexibility, simplicity and cost
effectiveness of Ethernet with the reliability, speed
and reach of optics to allow users to extend their
LAN environment across the MAN and WAN.
5. Gigabit Ethernet switch with a speed of 10/100/1000 Mbps
Fast Ethernet switch with a speed of 10/100 Mbps
6. SFP modules are made to support singlemode and multimode fiber. It works with
simplex and duplex. Wavelength options range from 850 nm to 1550nm.
Networking ranges are anywhere from around 500 meters to over 100 km.
A fiber media converter is a simple networking device that connects and
translates signals between fiber optic cabling and another type of cabling media
such as UTP (unshielded twisted pair) copper Ethernet cables
7. Technology
In 1983, the IEEE 802 Local-Area
Network/Metropolitan-Area Network Standards
Committee (LMSC) released the 802.3 standard for
Ethernet—a shared medium for LANs using a
distributed media access control (MAC) mechanism.
Ethernet was defined as an open standard in the early
1980s by a consortium comprised of Digital
Equipment Corp., Intel.
8. PREAMBLE – Ethernet frame starts with 7-Bytes Preamble. This is a
pattern of alternative 0’s and 1’s which indicates starting of the frame and
allow sender and receiver to establish bit synchronization. But today’s
high-speed Ethernet don’t need Preamble to protect the frame bits.
Start of frame delimiter (SFD) – This is a 1-Byte field which is always set
to 10101011. SFD indicates that upcoming bits are starting of the frame,
which is the destination address.
Destination Address – This is 6-Byte field which contains the MAC
address of machine for which data is destined.
Source Address – This is a 6-Byte field which contains the MAC address
of source machine.
9. Length – Length is a 2-Byte field, which indicates the length of
entire Ethernet frame.
Data – This is the place where actual data is inserted, also
known as Payload. Both IP header and data will be inserted
here if Internet Protocol is used over Ethernet.
Cyclic Redundancy Check (CRC) – CRC is 4 Byte field. This
field contains a 32-bits hash code of data, which is generated
over the Destination Address, Source Address, Length, and Data
field. If the checksum computed by destination is not the same
as sent checksum value, data received is corrupted.
11. Optical Ethernet Today
Optical Ethernet systems are evolving beyond
mere optical links that interconnect isolated
LANs.
Rather, they are becoming systems in
themselves, providing scale and functionality
that is simply not feasible with copper-based
Ethernet, including those linked by routers.
12. Local Area Network(LAN).
Campus Area Network(CAN).
Metropolitan Area Network(MAN).
Wide Area Network(WAN).
14. Recent Trends
Optical Ethernet Switches
GBIC Modules
10-Gigabit Ethernet Proposed
Standards(802.3ae)
10-Gigabit Ethernet May Be Optical
Only
15. Advantages
Optical Ethernet is beginning to revolutionize
metropolitan-area networks by delivering very high
bandwidths - 100M bit/sec, 1G bit/sec or even
higher - across cities and regions, Optical Ethernet
networks can easily handle the needs of both data
and circuit switched or voice applications..
Ethernet is a simple and widely understood
technology.
Ethernet is the best technology for carrying IP traffic
- Ethernet and IP have grown up together.
Optical Ethernet networks can easily handle the
needs of both data and circuit-switched or voice
applications. Circuit traffic requires only modest
17. Applications
1.OPTICAL ETHERNET FOR SERVICE PROVIDER
As a result of ethernet expansion into MAN and
across the WAN service providers are looking for
ways to provide connectivity services across the
metro bottleneck between their enterprise customers
and the service provider’s backbone.
2.OPTICAL ETHERNET FOR ENTERPRISES
Optical Ethernet an enterprise can break the
bandwidth bottleneck by exploiting the simplicity of
ethernet across the MAN and WAN . Optical ethernet
allows businesses to seamlessly expand their
ethernet LANs across the metro backbone and obtain
cost effective network connectivity to enable a set of
value added services and application.
18. Conclusion
Optical Ethernet represents one of the most
interesting solutions for high-speed and reliable
data communication. Impact of data loss is huge
that is way different types of protection
techniques have been adopted to overcome the
problem of failure.
19. References
1. N. Frigo, K. Reichmann, P. Iannone, "Whatever
Happened to Fiber-to-the-Home?", Proceedings
of OFC 2003 paper TuR 1, pp. 280-281, March,
2003.
2. A. Savvas, "Fiber Networks: coming to a
premises near you", Lightwave Europe, pp. 27-
28, October 2002.
3. C. E. Spurgeon, Ethernet The Definitive Guide,
USA:O'Reilly and Associates, Inc., February
2000.
4. L. B. Quinn, R. G. Russsell, Fast Ethernet, John
Wiley & Sons, 1997.
