The EX23-R is set up to be used straight out of the box. Making changes to settings is not recommended. However, if you need to change any settings, please follow these instructions:
NOTE
To reset to factory defaults, jumper port 1 to port 2 using a 1-KAB2107 cable and power cycle the unit. Reset to factory defaults will cause ports to auto negotiate. However, Ports 5 and 6 must be manually configured to 100Mb full duplex (status LED will be orange) for reliable PTP function. Contact HBM Customer Service for assistance with manual configuration.
Reference