In this article you can find the compatibility diagrams of the LR1002/LR1002-1ET/LR1002-1EC devices.
Case 1: we can have an ePoE switch and an ePoE camera, for that we will need a LR1002 on the switch side and another one on the camera side. All communicating by coaxial cable.
Case 2: another option is to have an ePoE switch and a standard PoE camera. For that we will need a LR1002 on the switch side and a LR1002-1ET on the camera side, to transform the power supply part to PoE standard so that the camera can receive it:
Case 3: the other option is to have a standard PoE switch and an ePoE camera, so you need on the switch side an LR1002-1EC and on the ePoE camera side an LR1002 to convert the power part from PoE to ePoE:
Case 4: the last option, if we don't have any ePoE device, what we will do is to use both the LR1002-1EC on the Switch side and an LR1002-1ET on the camera side:
In conclusion: to pass signal and power from ePoE devices through coax we will need the LR1002, while the LR1002-1ET (camera side) and LR1002-1EC (switch side) are used when such conversion is done from standard PoE technology (af or at).