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Glosario de abreviaturas (orden alfabético) - 8/8
VHF Very High Frequency (30 - 300 Mhz)
VLF Very Low Frequency
WMO World Meteorological Organization
X.25 Communication protocol used on the PSDN networks to
exchange digital data between terminals.
X.400 Message handling protocol used on the X.25 (PSDN)
networks by e-mail services around the world to exchange
messages and electronic files between subscribers.
