220 Blackfriars

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VOXISS

Specialist voice alarm, public address, display, and intercom systems for critical infrastructure — designed, supplied, installed, and maintained by experts.

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Glossary — Updated Monthly

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.

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