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virtual circuit number
A 12-bit
field in an X.25 packet level protocol (PLP) header that identifies an X.25
virtual circuit. VCN allows data communications equipment (DCE) to determine
how to route a packet through the X.25 network. VCN is sometimes called logical
channel identifier (LCI) or logical channel number (LCN). Sometimes called
LCI (logical channel identifier) or LCN (logical channel
number).
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