Glossary of Terms 277
PSK: Phase shift keying
PSN: Packet-switched network
PSNP: Partial Sequence Number PDU
PSPDN: Packet-switched public data network
PSTN: Public switched telephone network
PTT: Post, telephone, and telegraph
PVC: Permanent virtual circuit
QA: Quality assurance
QC: Quality control
QAM: Quadrature Amplitude Modulation
QoS: Quality of service
RADIUS: Remote Authentication Dial-In User Service
RAM: Random access memory
RARP: Reverse Address Resolution Protocol
RBOCs: Regional Bell operating companies
RCP: Remote Copy Protocol
RFC: Request for Comments
RIP: Routing Information Protocol
RISC: Reduced Instruction Set Computer
RJE: Remote job entry
RLP: Remote Location Protocol
RMON: Remote monitoring
ROI: Return on investment
ROM: Read-only memory
RPC: ...