AMT-5 Controlling Node
The controlling node in an AMT-5 system performs control and coordination operations. An AMT-5 system will have at least one controlling node, typically 2 in on-board train and metro applications and more than 3 in land based control and monitoring applications.
The controlling node routes audio and data information between AMT IP and CAN networks and interfaces to VoIP systems. It holds recorded messages and performs Digital Voice Announcement functions.
The device is built with interfaces suitable for the specific application and client configuration using standard hardware and software modules within an embedded software environment.
Controlling Node software module holds the audio zone allocation database and the alarm logs. It arbitrates between different competing sources of announcement, such as two different announcers attempting to make microphone announcements, DVA announcements and background music. Announcements have up to 7 priorities, with lower priority announcements being able to be interrupted by higher priority ones.
The AMT5-CN units hold the configuration for the amplified speakers, including the latest firmware that is downloaded automatically to any device connected on the network. Configuration consists of loading standard audio messages, music, PID messages, creating PA zones, identifying and tagging the location of PA units and speakers (if door opening announcements are to be made only on speakers near the doors) within the train.
The Controlling Node (CN) functions:
- Configuration functions for automatic speaker discovery, audio zone creation.
- Test and diagnostic functions.
- Management functions. Speaker and microphone control. Speaker On-line/Off-line selection
- Audio program control
- Pre-recorded announcement selection
- Connecting the HAP to the speakers for announcements
- Connecting HAP to OCC and OCC to HAP
- Connecting OCC to speakers and zone control
- Establishing PIP communications.
- PID display management
The controlling node is configured via the Ethernet port either by using a web interface or the Trantek diagnostic and maintenance software.