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In Unit 2 differing network topologies were outlined.
With a ring network, it can be seen that there
is a much great scope for sharing on the networking,
as apposed to a bus network on which nodes contend
to get access to the network. The disadvantages
of a traditional token ring, however, often overrule
their advantages. These disadvantages have now
been overcome with networks such as FDDI (Fibre
Distributed Data Interchange). This research sheet
focuses on the techniques that FDDI has used to
overcome the problems in token ring networks.
BEng Comp Net and DSys
BEng Software Eng
BEng Soft Eng (P/T)
BEng Elec & Communication
BEng Elect & Computer Eng.
BEng Electrical & Electronic
BEng Multimedia Systems
BSc Network Computing
BSc Soft Tech
BEng Human Computer Systems
BSc Management & Technology
BSc Management & Tech (P/T)
BSc Computing (Cats)
BEng Computer Systems
James Watt College
1. Outline the disadvantages of a traditional
Token Ring-based network:
2. Which techniques does FDDI use to overcome
the problems of a Token Ring network:
3. How does FDDI use timed-tokens, and how might
these be used to allow priority on the ring. Why
might this type of network be used in a real-time
industrial control network?
4. The EaStMAN network which spans Edinburgh was
initially installed with an FDDI network. Outline
the geographical layout of the network, and the
length of the cables used to connect the institutions
involved. Which is the longest cable run?
5. For the EaStMAN FDDI network, estimate the
amount of time that a light pulse will take to
travel completely around the ring. Assume that
the light pulse travel at one-third the speed
of light (1E8 m/s).
6. A data frame on an FDDI network can be between
22 and 4500 bytes long. For a base rate FDDI network,
determine the amount of time for the minimum and
ther maximum data frame length.
7. What is a Multiple Access Unit (MAU) on an
ring network? What problem does a MAU overcome?
Design a network which uses four MAUs to connect
between four remote networks. There are six nodes
to connect at each site.
There is no need to draw it here, just outline it in text