448 ITU‐T's Technical Reports and Specifications Abbreviations This Technical Report uses the following abbreviations: 3G Third Generation mobile networks 4G Fourth Generation mobile networks AMI Advanced Metering Infrastructure CERT Computer Emergency Response Teams CIO Chief Information Officer CIP Critical Infrastructure Protection CRISALIS CRitical Infrastructure Security AnaLysIS DoS Denial of Service DDoS Distributed Denial of Service DSL Digital Subscriber Line EC European Commission ENISA European Network and Information Security Agency EU European Union FTTx Fiber to the X (B – Building, Business; H – Home; C – Cabinet, Curb) GPS Global Positioning System GRC Governance, Risk and Compliance HDTV High‐Definition Television ICS Industrial Control System ICT Information and Communication Technology IDS Intrusion Detection System IoT Internet of Things IP Internet Protocol IPTV Interactive Personality Television IT Information Technology M2M Machine‐to‐Machine NFC Near Field Communication PII Personally Identifiable Information PKI Public Key Infrastructure RFID Radio Frequency Identification SAW Surface Acoustic Wave SCADA Supervisory Control and Data Acquisition SG Study Group