olemus
funktsionaalüksus, mis andmesides
tükeldab sõnumeid pakettideks
=
a telecommunications device that breaks a data stream into individual packets and formats the packet headers

ülevaateid
https://en.wikipedia.org/wiki/Packet_assembler/disassembler

http://ps-2.kev009.com/tl/techlib/manuals/adoclib/aixlnk25/x25usrgd/padoverv.htm