Verified
Station types:
a) Primary station
b) Secondary station
Configurations:
a) Unbalanced configuration
b) Symmetrical configuration
c) Balanced configuration
Modes of communication:
a) Normal Response Mode (NRM).
b) Asynchronous Response Mode (ARM).
c) Asynchronous Balanced Mode (ABM).
Frames:
a) Flag field
b) Address field Control field
c) FCS field
d) Information field