Building microphone test cables for Axia devices
Most Axia devices that have audio inputs and outputs also have a self-test utility for testing them. Testing the Microphone inputs on the Power Station, QOR, and the classic (original) Axia Mic nodes, requires a special cable connecting the RJ45 outputs to the XLR inputs. This document covers building that cable but does not cover the test procedure.
The self-test procedure for devices where there is an XLR microphone input requires a special cable for testing. This cable connects the RJ45 outputs to the XLR inputs with a resistor network to provide the proper level at the XLR inputs.
You will need two cables for testing Power Station and possibly four for testing a QOR.
To construct this cable, you will need (per cable);
- XLR Male connector
- Qty 4 - 39k Ohm resistors
- Qty 1 - 150 Ohm resistor
- Pre-made (or self-made) Cat 5 cable with an RJ45 connector on one end.
- Soldering and assembly tools
Here is the schematic showing the wiring of the test cable. If you would like to download a PDF of this drawing, click here.
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