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Last update: July 20, 2021

General Network Guidance

Practical Considerations

Power over Ethernet and Crossover Cables

All units work on IEEE 802.3af Standard active Power over Ethernet (abbreviated to PoE).

PoE comes in two ways: either power on the data lines or on the spare lines: Green-GO Digital Intercom products support both. There is also no need to worry about using crossover cables as all devices support MDIX (automatic detection).

Some units can also work with an external power supply (multichannel stations and rack mount interface units). PoE uses a sensing method to check if a connected device needs power and how much. It will only apply power when needed.

Bandwidth and Latency

By default, the system audio runs at a 16-bit sample rate providing 15 kHz of dynamic range. The number of active sources determines the network bandwidth used.

An active source is, for example, a user with talk enabled and actually speaking (this is the gate functionality). Each active source uses about 400Kbps, less than 0.4% on a 100Mbps network.

The audio latency for wired devices is fixed at ten milliseconds (headset-to-headset), comparable to standing 3.5 meters away from the person talking (no lip-sync problems).

Quality of Service (QoS) / Class of Service / IEEE 802.1p

The Green-GO digital intercom system is designed to work on a shared network. However, as the latency of the Green-GO digital intercom is very low (10 milliseconds), there is a small requirement on the network switches used. The switches need to support Quality of Service (QoS) or IEEE 801.2p. Almost every professional switch supports this, but check the specifications.

VLAN and 1 Gbps backbones

The Green-GO digital intercom can work with or without a VLAN.

When deploying a large-scale network with a 1GB backbone that uses a lot of multicast/broadcast (more than 100Mbit), it is good practice to create a separate VLAN for Green-GO based on 100Mbit Layer2 multicast technology.

Boot up time and Network indication

The boot-up time of the devices is less than 3 seconds, but care should be taken as some switches can take up to 30 seconds to bring up the network link (this can be due to a spanning tree functionality of the switches).

Each Green-GO device will indicate if the network connection is ok and other Green-GO devices are visible with the same configuration. The belt packs will have a blue backlight if there is a problem or no other devices are found, the MCX rack and MCXD desktop station will blink, the Setup button will flash red, and the interface units will flash the backlight.

IP addressing

Usually, configuring the IP address is NOT needed for the regular operation of the system. The handling of IP addresses is only needed if the Green-GO devices need to communicate with a computer (only for loading new configuration or monitoring and firmware updates). By default the units get a dynamic IP address via DHCP or LLC, a fixed IP address can be set with the Firmware Update program.

Old documents for further reference (for creating this)

Reference document for Green-GO 4:

Maybe also add guidance on client network setup (Win / macOS)

Written by: Timo Toups
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