Data Bus Systems and Protocols Flashcards
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Which protocol architecture is used by MIL-STD-1553?
Answer: Command/response with time division multiplexing
MIL-STD-1553 uses a command/response, time division multiplexing protocol managed by a Bus Controller that polls all Remote Terminals.
What is the fixed data transfer rate of MIL-STD-1553?
Answer: 1 Mbps
MIL-STD-1553 operates at a fixed data rate of exactly 1 Mbps.
How many Remote Terminals (RTs) can be addressed on a single MIL-STD-1553 bus?
Answer: 31
MIL-STD-1553 uses 5-bit RT addressing, which allows 32 addresses; however, address 31 is reserved for broadcast, leaving 31 usable RT addresses.
What is the role of a Bus Monitor (BM) in a MIL-STD-1553 system?
Answer: Passively records all bus traffic without transmitting
A Bus Monitor passively listens to and records all MIL-STD-1553 bus traffic for analysis or logging without participating in transactions.
ARINC 664 Part 7 (AFDX) is derived from which commercial networking standard?
Answer: Switched Ethernet (IEEE 802.3)
AFDX (Avionics Full-Duplex Switched Ethernet) is based on switched Ethernet (IEEE 802.3) with deterministic enhancements for avionics use.
What AFDX mechanism ensures deterministic, guaranteed bandwidth for each avionics data stream?
Answer: Virtual Links with Bandwidth Allocation Gaps (BAGs)
AFDX uses Virtual Links (VLs), each with a defined Bandwidth Allocation Gap (BAG), to guarantee deterministic delivery for every data stream.
Which signal encoding scheme does MIL-STD-1553 use?
Answer: Manchester II Biphase
MIL-STD-1553 uses Manchester II Biphase encoding, which provides a mid-bit transition that allows clock recovery from the data signal.