EN54
European standard for fire detection and alarm systems, including voice alarm components.
VA / Voice Alarm
An audio system designed to broadcast intelligible emergency announcements to aid evacuation.
PA / Public Address
A system used to distribute audio across a building or site for general announcements and music.
SIP
Session Initiation Protocol — an IP-based standard for real-time voice and video communication.
SIPP
A material specification for rail products governing fire performance properties.
Long Line PA
PA system designed for extended cable runs in tunnels and highway environments.
100V Line
High-impedance audio distribution standard allowing many speakers over long cable runs.
LSZH
Low Smoke Zero Halogen — cable specification producing minimal toxic gases in fire.
CIS
Customer Information System — displays and screens providing real-time passenger information.
IK10
Impact protection rating indicating resistance to vandalism and physical impact.
PoE
Power over Ethernet — delivers electrical power via network cabling to IP devices.
PAVA
Public Address and Voice Alarm — combined systems for both general audio and life-safety use.
