RedNet Ethernet Switch Requirements

Networked audio with RedNet is simple. For the majority of systems, setup will be extremely straightforward. The following guide details exactly what to do with your switch when setting up the network. Whether you're new to networking or a seasoned IT professional, the information below will be easy to implement.

 

What to look for in a switch

The RedNet Dante network requires the use of at least one Gigabit Ethernet switch. In larger installations multiple switches will be needed. While some networks may function with unmanaged switches, performance varies widely with available switches. It is therefore required that a managed gigabit Ethernet switch is used with any RedNet system in order to guarantee rock-solid audio performance.

Here are the requirements of any switch to be used with a RedNet system:

• Gigabit rated (1000 Mbps)

• Non-blocking

• Quality of Service (QoS) with four queues

• Diffserv (DSCP) QoS with strict priority

• Switches with a built-in power supply are recommended for optimum audio performance

 

Specific switch examples

Unlike other networked audio systems, Dante (and therefore RedNet) works with standard, off-the-shelf Ethernet hardware, which is commonly available and needn't be expensive. There are many switches available with varying features, number of ports and in various sizes. Although not an exhaustive list, below are some switches that Focusrite has found to be ideal for RedNet:

• Cisco SG200-18

• Cisco SG200-26

• Cisco SG300-10

 

How to set up your switch

To set up the managed switch, the following DSCP values should be given the priority shown in the table. Please refer to the user guide of your managed switch for instructions on how to set DSCP packet priority values. This may be under a section called QoS or Quality of Service.       

DSCP Value

Priority

Usage

CS7

High

Time critical PTP events

EF

Medium

Audio, PTP

CS1

Low

(reserved)

BestEffort

None

Other traffic

 

Example Switch Setup: Cisco SG200 Series

  1. Log in to switch via its web page (in this case our switch has IP address 192.168.1.254 which is the default value)

  2. On the left hand side, click Quality of Service



  3. On the following screen, ensure that QoS is enabled and that Trust Mode is set to DSCP



  4. Next, click on DSCP to Queue. Note that this switch uses a scale of 1-4 where 4 is highest priority and 1 is lowest. Here, CS7 (Time critical PTP events) and EF (Audio, PTP) have incorrect priorities



  5. Set the priorities properly by clicking on the drop down menu and selecting the corresponding numbers.



  6. Next, click apply. There is one final step – click save at the top right of the screen and on the following page, ensure that Running Configuration and Startup Configuration are selected. After clicking OK, reboot the switch.

  7. Your switch is now ready to use RedNet