Maximum period, in milliseconds, between IIH PDUs
on multiaccess networks at this level for LANs.
The value at L1 is used as the period between
Hellos on L1L2 point to point circuits. Setting
this value at level 2 on an L1L2 point to point
circuit will result in an error of InconsistentValue.
This object follows the resettingTimer behavior.