Multiplexing and Rotary Switches

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Questions and Answers

What is the primary function of the shielding in data bus systems?

To protect against electromagnetic interference (correct)

To reduce physical component size

To improve system aesthetics

To increase data transmission speed

What is the maximum number of bits that can be transmitted in a single digital word within data bus systems?

32 bits

64 bits (correct)

16 bits

128 bits

Which term describes the type of data transmission where information flows in both directions?

Simplex

Multicast

Duplex (correct)

Unidirectional

How are multiple transmissions over a data bus coordinated?

By timers or bus controllers Signup and view all the answers

What role does the twisting of wires play in a data bus system?

To cancel out magnetic fields and reduce interference Signup and view all the answers

What can happen if multiple stations transmit over the same frequency simultaneously in a data bus system?

No messages can be understood Signup and view all the answers

What is the function of a multiplexer bus in a data bus system?

To serve as a general connection without specific targets Signup and view all the answers

What would happen if a data bus operated as a free-for-all communication system?

Data would be a jumble of 1s and 0s Signup and view all the answers

What functionality does the Bus Controller (BC) typically perform in a data bus system?

Manages the transfer and sequencing of data between systems Signup and view all the answers

Which standard defines the electrical and protocol characteristics for a data bus used in military applications?

MIL-STD-1553B Signup and view all the answers

What does Time Division Multiplexing (TDM) allow in a data bus system?

Staggered transmission of signals over a single channel Signup and view all the answers

What was a primary user of the initial MIL-STD-1553 standard released in 1973?

F-16 Fighting Falcon Signup and view all the answers

Which component is primarily responsible for confirming data transfer completion and error detection?

Remote terminal Signup and view all the answers

What is the purpose of using a single transmission medium in a data bus system?

To minimize the number of required wires for communication Signup and view all the answers

What is the significance of the term 'composite pulse train' in the context of TDM?

It signifies the combined output of staggered signal samples over a common medium Signup and view all the answers

Which of the following statements is true regarding data transfer in a MIL-STD-1553 data bus?

Data is transferred in a defined sequence, one at a time. Signup and view all the answers

What primary factor affects the performance of fibre optic systems compared to wire conductors?

Environmental conditions Signup and view all the answers

What organization maintains the ARINC Specification 429?

Airlines Electronic Engineering Committee Signup and view all the answers

Which of the following roles does ARINC serve in the aviation industry?

Providing a single license coordinator for radio communications Signup and view all the answers

Which of the following is NOT a factor that affects fibre optics as described?

Voltage level Signup and view all the answers

How is power managed in junctions within fibre optic systems?

It is evenly divided among branches. Signup and view all the answers

What key aspect does ARINC Specification 429 define?

Communications methods between avionics systems Signup and view all the answers

Who can be a shareholder in Aeronautical Radio Inc.?

Only airlines and aviation-related companies Signup and view all the answers

What was the original purpose of organizing Aeronautical Radio Inc. in 1929?

To provide coordination of radio communications Signup and view all the answers

What is a primary benefit of multiplexing in aviation?

It improves circuit reliability. Signup and view all the answers

How do rotary switches function in multiplexing?

They rotate to synchronize data passage. Signup and view all the answers

What role do logic gates play in multiplexing?

They respond in sequence to clock pulse signals. Signup and view all the answers

What type of equipment is associated with the ID 004?

Inertial Reference System Signup and view all the answers

What is the function of a demultiplexer in a multiplexing system?

To convert digital signals back to analogue format. Signup and view all the answers

Which equipment is identified with the ID 007?

Radio Altimeter Signup and view all the answers

What does the ID 029 correspond to?

ADDCS and EICAS Signup and view all the answers

What must happen to analogue signals before they can be multiplexed in an aircraft?

They must be converted to digital signals. Signup and view all the answers

What is the role of a Bus Controller (BC) in aircraft multiplexing?

To gather inputs and distribute processed data. Signup and view all the answers

Which equipment is paired with the ID 006?

Air Data System Signup and view all the answers

How many separate inputs can be transmitted through to outputs using a multiplexing system?

Eight inputs through eight outputs. Signup and view all the answers

To which equipment type does ID 003 belong?

Thrust Control Computer Signup and view all the answers

Which equipment is associated with ID 00B?

Global Positioning System Signup and view all the answers

Which of the following is not a characteristic of multiplexing in aviation?

Increased complexity of wiring systems. Signup and view all the answers

What type of equipment is represented by ID 005?

Altitude and Heading Reference System Signup and view all the answers

What does ID 02A represent?

Thrust Management Computer Signup and view all the answers

Study Notes

Benefits of Multiplexing

Significant reduction in wire bundle weight enhances overall aircraft efficiency.
Improved circuit reliability through synchronized operation.

Multiplexing Mechanism

Two rotary switches are synchronized, rotating around a series of contacts to connect inputs and outputs sequentially.
Logic gates sample inputs and transmit data over a common transmission line, controlled by clock pulse signals.
Eight separate inputs can be transmitted via multiplexing to eight outputs on a single line.
Analog signals must be converted to digital for multiplexing, then reverted to analog post-demultiplexing.

Data Bus Systems

Utilizes a twisted pair of wires that are shielded and jacketed to ensure accurate data transmission.
Shielding mitigates electromagnetic interference (EMI) and induces errors, promoting data integrity.
Data can travel in simplex (one-way) or duplex (two-way) configurations.
Commonly utilizes 8-, 16-, 32-, or 64-bit digital words for data communication.
Communication is managed by Bus Controllers (BCs) to prevent data collisions on the bus.

Functionality of Data Bus

The multiplexer bus acts like a highway for data, sending digitized information while ensuring error detection.
Data transfer confirmations are received by remote terminals once complete.
Bus Controllers can be integral parts of computers like Flight Management Computers (FMC).

MIL-STD-1553 Data Bus

Defines electrical and protocol standards for data buses, allowing multiple systems to share communication over a common wire.
MIL-STD-1553B specifies Time Division Multiplexing (TDM) for staggered data transmission, facilitating simultaneous communication among avionics units.
Released in August 1973, with initial applications in the F-16 Fighting Falcon.

Aeronautical Radio Incorporated (ARINC)

Established in 1929 by four airlines to coordinate radio communications within the aviation industry.
Only airlines and aviation-related companies can hold shares, ensuring a focus on the aviation sector.
A leader in developing specifications for avionics, notably ARINC Specification 429 managed by the Airlines Electronic Engineering Committee (AEEC).
ARINC 429 specifies communication standards for avionics systems, detailing digital addresses for various equipment types, such as Flight Control Computers and Flight Management Computers.

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Description

This quiz explores the principles of multiplexing and the synchronization of rotary switches in data transmission. Learn about the advantages of multiplexing, including wire bundle reduction and enhanced circuit reliability. Test your knowledge of these essential concepts in aviation technology.