Comtech EF Data CDD-562AL Installation And Operation Manual page 63

CDD-562AL/564A/L Multi-Channel Demodulator
IP Module Ethernet Interface
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Additional statistics added to the compression statistics menu to give feedback on the
compression efficiency achieved.
4.2.3.1 ALDC vs LZS Compression Comparison
These numbers have been generated using an internally created test program. This program takes the
target benchmark files and splits the files into payload size chunks and compresses each chunk in a
separate invocation of the compression algorithm. This is important to note because most compression
algorithms are applied to the entire file data set as a single invocation of the compression algorithm,
which is easier for other types of compression algorithms (LZS, GZIP in specific). This, of course, does
not apply to streamed packet data across an IP network (e.g., FTP transfer).
Payload
Algorithm
size
ALDC 1472
ALDC 1000
ALDC 500
ALDC 100
ALDC 1472
ALDC 1000
ALDC 500
ALDC 100
File Set Ratio
Calgary 1.76
Calgary 1.76
Calgary 1.77
Calgary 2.09
Canterbury 1.71
Canterbury 1.72
Canterbury 1.74
Canterbury 2.04
4–5
Payload
Algorithm
size
LZS 1472
LZS 1000
LZS 500
LZS 100
LZS 1472
LZS 1000
LZS 500
LZS 100
Revision 0
MN-CDD562AL564AL
File Set Ratio
Calgary 1.66
Calgary 1.66
Calgary 1.68
Calgary 1.97
Canterbury 1.61
Canterbury 1.62
Canterbury 1.63
Canterbury 1.91