Individual ADSL ports have been disabled without the configuration being changed accordingly.
If an ADSL router is connected to another port from one xDSL port, that port will be automatically disabled. The same behavior occurs when a computer behind an ADSL modem or bridged ADSL router is operating on a different port.
The MAC address of the terminal appears on several xDSL ports. For security reasons, every additional port on which this MAC address appears is automatically deactivated.
This behavior can be adjusted in the configuration of the IES-1248.
Deactivate it in the menu "Basic > Switch" under the option "MAC Anti-Spoofing".