Term
Abbreviation
or Acronym
Generic Routing EncapsulationGRE
(refers to Bellcore standards)GRxx
graphical user interfaceGUI
H
hierarchical assured rateHAR
High-Level Data Link Control; High-Speed Data Link ControlHDLC
Hashed Message Authentication CodeHMAC
high-order domain-specific partHO-DSP
hierarchical round-robinHRR
high-speed serial interface (abbreviation pronounced “ hissy” )HSSI
I
input/outputI/O
Internet Assigned Numbers AuthorityIANA
Inter Access Point ProtocolIAPP
internal Border Gateway ProtocolIBGP
Industry Canada Communications SectionIC CS
International Code DesignatorICD
Internet Control Message ProtocolICMP
incoming-call requestICRQ
identification; identifying; identifierID
integrated DHCP access serverI-DAS
initial domain identifierIDI
initial domain partIDP
ISDN digital subscriber lineIDSL
International Electrotechnical CommissionIEC
Institute of Electrical and Electronics EngineersIEEE
Internet Engineering Task ForceIETF
Internet Group Management ProtocolIGMP
■ 559
Appendix A: Abbreviations and Acronyms
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