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.