Technical Guide | HelixNet IP Network Guidance Page 12
HelixNet
Audio
Bandwidth
Bandwidth required is based around the Audio stream – there is additional data on the
network, but it is not significant. Audio runs at 300kbps per audio stream. Figure 6
(below) shows a typical HelixNet system with four endpoints (HelixNet Devices)
connecting to the Main Station over powerline, and three endpoints (HelixNet Devices)
connecting to a switch, which in turn connects to the same Main Station.
Figure 6
- Each HelixNet device transmits at 300 kbps when a user is talking.
- The HMS-4X only routes audio where appropriate, between an audio source and
a listening destination. Audio mixing is done at each destination.
- An audio source is sent once to the HMS-4X. The HMS-4X then sends the audio
stream point-to-point to each destination that is currently listening to that
source.
- Talk pressed/latched = 300kbps is sent to HMS-4X.
- Each 2W/4W/PGM port when assigned = 300kbps is sent internally to HMS-4X.
- PGM on an HRM if assigned = 300kbps for the mic, 300kbps for PGM/SA
- No Talk or No Assignment = no audio is sent to HMS-4X.
Note: Enabling VOX on 2-wire or 4-wire port will significantly reduce the bandwidth as
otherwise, audio will always be sent from the I/O source to any listener in the system.
The same occurs for the distribution of the Program.
- Audio and Data sent will max out at 1.2Mbps per destination.
- Between linked HMS-4X stations, each audio source is sent once, and only if a
user is listening on the second HMS-4X.
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