Back plane normally refers to electronic bus standards such as VME(vestigal module europa) and PCI(periperal component interconnect) Jayachandran
Active backplanes
Passive
Backplanes have grown in complexity from the simple ISA (used in the original IBM PC) or S-100 style where all the connectors were connected to a common bus. Because of limitations inherent in the PCI specification for driving slots, backplanes are now offered as passive and active.True passive backplanes offer no active bus driving circuitry. Any desired arbitration logic is placed on the daughter cards. Active backplanes include chips which buffer the various signals to the slots.The distinction between the two isn't always very clear, but may become an important issue if a whole system is expected to have no single point of failure. A passive backplane, even if it issingle, is not usually considered a SPOF. Active backplanes are more complicated and thus have a non-zero risk of malfunction.
Active
Passive backplane
Two types. By saying there are two 'types' you are already stating that there are 2 differentthings and so the word 'different' isn't necessary.
two types are parasitic and saprophytic
There two types of cell procaryotic and eucaryotic.
Applications and data are two types of software.
two types of disccharides are sucrose and lactoes
eutrophication is of two types; natural and anthropogenic
Eggs and sperm