X.3 | Article about X.3 by The Free Dictionary
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The ITU-T standard
, approved by ISO
, which specifies the
basic functions and user-selectable capabilities of a PAD
X.3An ITU standard (1977) for a PAD (packet assembler/disassembler), which divides a data message into packets for transmission over a packet-switched network and reassembles them at the receiving side.