PACS

Picture archiving and communications systems

PBX

Private branch exchange

PHO

Physician hospital organization

PPO

Preferred provider organization

PSN

Packet switched network

PSTN

Public switched telephone network


RAN

Rural area network

RBOC

Regional Bell Operating Company

RIS

Radiology Information System


TCP/IP

Transmission control protocol/Internet protocol

TIE

Telemedicine Information Exchange


WAN

World area network

WATS

World area telephone service

WWW

World Wide Web



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