All NEs of type FO the user adds to the system are also available to the Networking Package. Since the FOXMAN-UN BP doesn’t know anything about their internal function initially, they are set up as simple network elements to which sections (via external ports) are bound. They need to be provided with termination points (TTPs) for external ports, defining also their internal structure. This is done while creating the NE of type FO.

In the example in figure Passing one NE of type FO above, the user needs to define the external ports of the NE of type FO via TTP configuration for at least one external STM-1 port and at least one external E12 port.

In the example in figure Defining the edges by two NEs of type FO above, the user needs to define the external ports of both NEs of type FO via TTP configuration for at least two external STM-1 ports for the first of the two NEs of type FO, and one STM-1 and one E12 ports for the second one.

The internal structure of the first NE of type FO is assumed to provide a signal structure STM1 PMS / RS / MS / VC-4 / VC-12 / P12. The internal structure of the second NE of type FO is assumed to multiplex/demultiplex the signal structure from E12 to STM-1 and vice versa. It is also assumed that the multiplex/demultiplex structure is the same as used by the FOX61x NEs.

The E12 port can be defined with the termination modes