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1. Presentation
On
Sub:
ETHERNET AND TOKEN
RING
CN
4nd Sem Computer
(2016-17)
Prepared By:
Name: Shail M. Nakum
Enr. No: 150410107054
Class: S.Y. : Computer
Div.-I

2. CONTENTS
• ETHERNET
• TOKEN RING

3. ETHERNET

4. •Ethernet is the most widely-installed local area network (
LAN) technology.
•Specified in a standard, IEEE 802.3, Ethernet was
originally developed by Xerox from an earlier specification
called Alohanet and then developed further by Xerox, DEC,
and Intel.
•An Ethernet LAN typically uses coaxial cable or special
grades of twisted pair wires.
•The most commonly installed Ethernet systems are called
10BASE-T and provide transmission speeds up to 10 Mbps

5. •The Fast Ethernet standard (IEEE 802.3u) has been
established for Ethernet networks that need higher
transmission speeds.
•This standard raises the Ethernet speed limit from 10
Mbps to 100 Mbps with only minimal changes to the
existing cable structure.
•Fast Ethernet provides faster throughput for video,
multimedia, graphics, Internet surfing and stronger error
detection and correction.

6. •Gigabit Ethernet was developed to meet the need for faster
communication networks with applications such as
multimedia
•The most important differences between Gigabit Ethernet
and Fast Ethernet include the additional support of full
duplex operation in the MAC layer and the data rates.

7. •10 Gigabit Ethernet is the fastest and most recent of
the Ethernet standards. IEEE 802.3ae defines a
version of Ethernet with a nominal rate of 10Gbits/s
that makes it 10 times faster than Gigabit Ethernet.

8. TOKEN RING

10. A Token Ring network is a local area network (LAN) in which all
computers are connected in a ring or star topology and a bit- or
token-passing scheme is used in order to prevent the collision of
data between two computers that want to send messages at the same
time. The Token Ring protocol is the second most widely-used
protocol on local area networks after Ethernet. The IBM Token Ring
protocol led to a standard version, specified as IEEE 802.5. Both
protocols are used and are very similar. The IEEE 802.5 Token Ring
technology provides for data transfer rates of either 4 or 16
megabits per second.

11. Very briefly, here is how it works:
•Empty information frames are continuously circulated on
the ring.
•When a computer has a message to send, it inserts a token
in an empty frame (this may consist of simply changing a 0
to a 1 in the token bit part of the frame) and inserts a
message and a destination identifier in the frame.

12. •The frame is then examined by each successive
workstation. If the workstation sees that it is the
destination for the message, it copies the message
from the frame and changes the token back to 0.
•When the frame gets back to the originator, it sees
that the token has been changed to 0 and that the
message has been copied and received. It removes the
message from the frame.

13. •The frame continues to circulate as an "empty" frame, ready to
be taken by a workstation when it has a message to send.
•The token scheme can also be used with bus topology LANs.

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