EB+ CAN Hub is used as a repeater when the length of a cable allocated to the towed vehicle exceeds 18 meters. With EB+ CAN Hub connected there is down-stream support for up to 40 meters of ISO 11992 cable.
EB+ CAN Hub automatically switches to repeater mode if only one EBS unit has been connected. CAN messages are passed through irrespective of the CAN ID.
Wiring diagram example can be found in Installation guide.