Description: This attribute records the slot numbers of the cards that the bus tap considers available on the busthat is, the cards that have an operational bus tap connected to the bus. The value of this attribute is determined automatically by the bus tap by monitoring signals generated by each bus tap on the bus; it cannot be changed by the operator. Normally, every card in the module signals its availability on both buses; if a card does not signal its availability on a bus this indicates that the card is not present or that its bus tap has failed. By examining this attribute for both of a card's BusTap components, it is possible to determine which cards are present in the module and which buses each can use. Note: If failuresInEffect contains either selfTest or clockSignal the bus tap is unable to monitor the availability of the bus taps on the bus; cardsAvailable will indicate that no bus taps are available on the bus.

Description of bits: n0(0) n1(1) n2(2) n3(3) n4(4) n5(5) n6(6) n7(7) n8(8) n9(9) n10(10) n11(11) n12(12) n13(13) n14(14) n15(15)