This attribute lists the type of the trunk. There can be up to eight(8)
types of trunks. The terrestrial and satellite trunk types have been
defined, leaving six(6) remaining types that can be defined by the
network administration. The set of allowed trunk types for a path is
indicated in the permittedTrunkType attribute of the PLC. When
selecting a route, PORS only chooses trunks whose PA trunkType
are in the permittedTrunkTypes set of the path.