The interface table for a physical port on a wan connection.
It is a list of items that are pertinent to the interfaces
that are part of this physical port. The number of entries
is dependent on the wanPhysPortType for the interface.
If the wanPhysPortType is none, there will be no entries
in the table for the port. If the wanPhysPortType is t1,
there will be 24 entries in this table for the port.
If the wanPhysPortType is e1, there will be 30 entries
in this table for the port. If the wanPhysPortType is
synchronous, there will be one entry in this table for the
port.