IEC 60878 5077

Headphones

To identify the socket, terminals or switch for headphones

IEC 60878 5211

Listen

To indicate a "listen" facility

IEC 60878 5210

Speak

To identify the speak mode

IEC 60878 5182

Sound; audio

To identify controls or terminals related to audio signals

IEC 60878 5072

Balance

To identify the balance control

IEC 60878 5013

Bell

To identify switches which operate bells, e.g. a door bell

IEC 60878 5576

Audio Off

To identify the control for Audio Off or to indicate that the Alarm System is in the Audio Off state.

60878 5850

Serial interface

To identify a connector for a serial data connection.

ISO 7000-3650

USB (Universal Serial Bus) Port

Indicates a connector for USB connection

IEC 60878 5576-2

Audio Paused

To identify the control for AUDIO PAUSED or to indicate that an auditory ALARM SYSTEM is in the AUDIO PAUSED state.