คำอธิบาย

การจัดหมวดหมู่:

Bottom layer (standard protocol)

top layer (standard protocol)

Middle layer (standard protocol)

Bottom layer with lock (standard protocol)

Middle layer with lock (standard protocol)

Bottom layer (proprietary protocol)

Top layer (proprietary protocol)

Middle layer (proprietary protocol)

Bottom layer with lock (dedicated protocol)

Middle layer with lock (dedicated protocol)