SamyGO

Looking further, "Service Menu"->Option->"MRT Option" has a "OTN Support" option, but it's GREYED OUT and defaults to ON.

BTW, there seem to be some interesting settings (e.g. "Provider Setup Support") in that "MRT Option" tree. Does anyone have some details on them?

The J Series does NOT seem to have an explicit "OTN Support: On/Off" in the service menu (INFO+MENU+MUTE+POWER). Instead, "Service-Menu->Control->SubOption->OPTION_SWU" offers the following (default) settings: OTN Server Type: operating OTN Test Server: OFF SWU Reset SWU Duration: OFF SWU Fail Test:...