This attribute associates the Link subcomponent with a specific
interface on a function processor, for example Lp/5 E1/3 Chan/0.
If IMA groups and independent links coexist on a card running
IMA and per-VC queueing is enabled, plan the selection of DS1 or
E1 ports to be used by the IMA group carefully. For a
4pDS3ChAtm function processor there is no per-VC queueing.