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1995-01-05
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Date: Tue, 26 Jul 1994 13:35:33 MDT
From: Rob Slade <roberts@decus.ca>
Subject: Book Review: "Ethernet Pocket Guide" by Spinney
BKETHPKT.RVW 940506
CBM Books
101 Witmer Road PO Box 446
Horsham, PA 19044
215-957-4265 215-957-4287
Fax: 215-957-1050
76702.1565@compuserve.com
books@propress.com
"Ethernet Pocket Guide", Spinney, 1994, 1-878956-43-4, U$15
As the subtitle says, this is "A practical guide to designing,
installing and troubleshooting ethernet networks." The book (at 60
pages, plus glossary and index, almost a booklet) is quite practical,
although some decisions regarding what to include and what to leave
out are a bit odd.
Chapter 1 is an introduction to Ethernet, and the standards around it.
The description covers the various aspects of Ethernet operation and
definition. The picture painted of "Carrier Sense Multiple
Access/Collision Detection" (CSMA/CD) will be clear to any intelligent
reader. On the other hand, the detail given of the ISO OSI model is
difficult to understand, since it is never referred to again. An
addition to this edition is a very clear and detailed overview of the
framing of Ethernet packets.
Chapter 2, dealing with cabling media, is the beginning of the heart
of the book. Cabling is really the strong point of this work.
Chapter 3 (Hardware) provides useful background information in terms
of the various other parts to the net. Another improvement to this
edition, however, is the inclusion of a number of new diagrams which
add greatly to the ease of understanding these topics. Chapter four,
on Design, gives good basic rules of thumb for doing your own design,
but you will still need some technical smarts to actually come up with
a design, let alone generate several and assess the best.
Chapter 5, Installation, again deals primarily with cabling and cable
runs. Chapter 6, Maintenance, while giving brief nods to management
aspects, is again primarily concerned with finding breaks in the
cable.
Given that the book deals exclusively and particularly with Ethernet,
the cabling emphasis is understandable. However, even within this
limited scope there could be some improvement. Although the 2.5 meter
markings on "thick coax" are mentioned often, there is no explanation
of "half-wave lengths", the reason for them. Table 2-2 offers, as an
advantage of glass fiber-optic cable, that it yields "extended
length". This is, in fact, the opposite of the reality: coax runs can
be longer overall since the "index of refraction" of coax is less than
that of fiber-optic cable.
However, with the proviso that this work is not "gospel", the book
would provide handy background information for those who don't have
the time for a full study of the field. For the novice who must face
putting a network together for the first time it may provide a false
sense of security, although it definitely *will* provide some helpful
advice. It may be best for the IS manager who needs to know just
enough to keep network contractors honest.