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Date: 15 Nov 93 15:06 -0600
From: Rob Slade <roberts@decus.arc.ab.ca>
Subject: Book Review: "Communications for Cooperating Systems" by Cypser
BKCMCOOP.RVW 931014
Addison-Wesley Publishing Co.
Kelly Ford, Promotion/Publicity Coordinator
P.O. Box 520 26 Prince Andrew Place
Don Mills, Ontario M3C 2T8
416-447-5101 fax: 416-443-0948
or
Tiffany Moore, Publicity 72203.642@compuserve.com
1 Jacob Way
Reading, MA 01867-9984
800-527-5210 617-944-3700
5851 Guion Road
Indianapolis, IN 46254
800-447-2226
"Communications for Cooperating Systems", Cypser, 1991
The subtitle of this book is "OSI, SNA and TCP/IP," thus giving a
nice, neutral alphabetic ordering to the systems. In reality this is
"SNA with OSI and TCP/IP." The organization, examples and slant to
the material is all unmistakably IBM: not altogether surprising, given
that they sponsored the Systems Programming Series from which it
comes.
Regardless of the generalities given in the preface, the intent seems
to be to prove that SNA can "fit in" with OSI and TCP/IP. That it
does need not be surprising: both systems are quite flexible.
However, please do note the emphasis here. You *can* learn about OSI
and TCP/IP from this book, but it will be, as it were, through
IBM-coloured glasses. The structure of the book itself follows the
SNA/SAA (systems network/application architecture) model, with a
four-layer model which only fits the OSI (open systems
interconnection) seven-layer or TCP/IP (transmission control
protocol/internet protocol) five-layer model after some degree of
work.
Part one comprises an overview and introduction, with three chapters
listing the usual platitudes regarding the needs and desires for open
systems. Part two describes "Application - Services," which is "above
the top" of both the OSI and TCP/IP models, and has no parallel
structures other than application programs. Part three discusses the
"End-to-End Data-Exchange Facilities" which relates to the
applications layer on both OSI and TCP/IP diagrams. Part four talks
of "Transport Inter-Subnetwork Facilities" relevant to the
presentation and session layers of OSI (and subsumed within the
application layer in TCP/IP). Part five deals with
"Link/Subnetwork-Access Facilities" which comprise the bottom four
layers of both models. (Notable here is chapter seventeen which,
somewhat surprisingly, gives an excellent overview of local area
networks and all component parts.)
While the book is fair and accurate as far as it goes, the IBM bias is
deeply entrenched, mostly in terms of what is *not* covered. It is
instructive to note that neither OSI nor TCP/IP are defined in the
glossary (or anywhere else). As only one example, in discussions of
presentation, ASCII and EBCDIC are listed but not Unicode, and there
is no mention of MIME at all.
An attempt has been made to present the book as a possible course
text. "Exercises" are found at the end of each chapter. They are
simple queries taken from the bottom of the questioning taxonomy. To
answer all correctly you need only read the chapter and recognize a
few key words. The "technical references" are of use only if you work
within an SNA/SAA environment. The two bibliographies could have been
compiled by collating "Books in Print" with a periodical index.
There is a very definite need for this book. SNA/SAA, although by no
means an "open" system, has a large installed base, and one that is
still expanding. Those both inside the IBM camp and without have
requirements to "cooperate" with each other. This work serves as a
valuable guide not to the implementation of gateways, but to the IBM
mindset and jargon. Those on both sides will find it a helpful
introduction to "how the other half lives."
copyright Robert M. Slade, 1993 BKCMCOOP.RVW 931014
Permission granted to distribute with unedited copies of the TELECOM
Digest and associated newsgroups/mailing lists.
DECUS Canada Communications, Desktop, Education and Security group newsletters
Editor and/or reviewer ROBERTS@decus.ca, RSlade@sfu.ca, Rob Slade at 1:153/733
DECUS Symposium '94, Vancouver, BC, Mar 1-3, 1994, contact: rulag@decus.ca