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JANET
Joint Academic Network
JB
Japan Boys
JCL
Job Control Language
JEC
Job Evaluation Classification
JES
Job Entry System
JIM
Job Information Memorandum
JIS
Jurisdictional Interstate Services
JIT
Just In Time
JMX
Jumbogroup Multiplex
JPEG
Joint Photographic Experts Group
JPL
Jet Propulsion Laboratory
JSC
Johnson Space Center
JSN
Junction Switch Number
JSW
Junctor Switch