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compr.txt
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1991-05-01
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TITLE: LINK/64 Compression
DOCUMENT #: TB.S.3-134
DATE: April 5, 1991
PRODUCT: LINK/64
PRODUCT VERSION: all
SUPERSEDES: NA
SYMPTOM: NA
ISSUE/PROBLEM
Under certain circumstances data compression is useful.
SOLUTION
Data compression is available by purchasing Compression Module daughter
boards from:
Newport Systems Solutions
Suite 103
4019 Westerly Place
Newport Beach, CA 92660
Phone: 800-662-4677
FAX: 714-752-8389
You will need one daughter board on the Novell synchronous+ board at each
end of the circuit.
The daughter boards provide on the fly data compression over the entire
range of 9600 to 64K bps.
Testing in Novell's lab has shown the compression to vary from 1:1 to 26:1.
The amount of compression varies with the type of data transmitted. Most
word processing, spreadsheet, and database files will be compressed
somewhere in a range from 4:1 to 6:1. Compression rates above 6:1 and as
high as 26:1 have been achieved but only with data that fits a highly
repetitive profile.
NOTE: previously compressed data files will slow down ANY data compression
system because all compression schemes look at section of the file to see
if it can be compressed,if not, the section is passed through
transparently. However, this takes an additional amount of processing time
(varying with the efficiency of the compression alogirithim).
The Compression Module is designed to work with both Newport's LAN 2 LAN
product and Novell's LINK/64 which is OEMed from Newport. Both products
are optimized for NetWare.