Ethernet Bonding
From TBwiki
Ethernet Bonding refers to the capability of Tmedia units to use the two available VoIP Ethernet ports as a bonding pair. When the active port becomes unusable (cable disconnected, limited connectivity), the other port is used to transport Ethernet traffic.
Note: Ethernet bonding can be configured on an SBC and a 7800-ctrl, but only running as Baremetal.