AET Data Bus Systems and Protocols 2

Question 1

Which protocol architecture is used by MIL-STD-1553?

Accepted Answer

Command/response with time division multiplexing

Answer

MIL-STD-1553 uses a command/response, time division multiplexing protocol managed by a Bus Controller that polls all Remote Terminals.

Question 2

What is the fixed data transfer rate of MIL-STD-1553?

Accepted Answer

1 Mbps

Answer

MIL-STD-1553 operates at a fixed data rate of exactly 1 Mbps.

Question 3

How many Remote Terminals (RTs) can be addressed on a single MIL-STD-1553 bus?

Accepted Answer

31

Answer

MIL-STD-1553 uses 5-bit RT addressing, which allows 32 addresses; however, address 31 is reserved for broadcast, leaving 31 usable RT addresses.

Question 4

What is the role of a Bus Monitor (BM) in a MIL-STD-1553 system?

Accepted Answer

Passively records all bus traffic without transmitting

Answer

A Bus Monitor passively listens to and records all MIL-STD-1553 bus traffic for analysis or logging without participating in transactions.

Question 5

ARINC 664 Part 7 (AFDX) is derived from which commercial networking standard?

Accepted Answer

Switched Ethernet (IEEE 802.3)

Answer

AFDX (Avionics Full-Duplex Switched Ethernet) is based on switched Ethernet (IEEE 802.3) with deterministic enhancements for avionics use.

AET - Avionics Electronic Technicians Practice Test