It provides a medium for the exchange of data and information between various Avionics subsystems

Integration of Avionics subsystems in military or civil aircraft

set of formal rules and conventions governing the control of interaction among the systems

Low level protocols define the electrical and physical standards

High level protocols deal with the data formatting, including the syntax of messages and its format

Once the equipments are standardized,

equipments are easily Available, Maintainable,

reinstalled and reconfigured (Interchangeability)

Standardization of equipments are based on the document Military Standard (MIL-STD) and Aeronautical Radio Inc. (ARINC) specifications and Reports

Civil Aircraft are certified by:

• FAA, EuroCAE, CAA, JAA, DGAC, DGCA in India

• Standards- ARINC, RTCA, SAE, AIAA, IEEE

Military Aircraft Certified by:

• DOD, CEMILAC in India

Safety Requirements in Civil Aviation more

stringent

CERTIFIABILITY

Developed at Wright Patterson Air Force Base

since 1970s

Published First Version 1553A in 1975

Introduced in service on F-15 Programme

Published Second version 1553B in 1978

MIL-STD-1553, Aircraft Internal Time Division Command /

Response Multiplex Data Bus, is a Military standard

(presently in revision B), which has become one of the

basic tools being used today for integration of Avionics

subsystems

The standard describes the method of communication

and the electrical interface requirements for the subsystems

connected in the data bus

Data Rate

Message Length

Data Bits per Word

Transmission Technique

Encoding

Protocol

1 Mbps

32 Word Strings(maximum)

16 Bits

Half - Duplex

Manchester II Bi-phase

Transmission Mode

Word Length 20 Bits

Voltage Mode

Command Response

Operation Asynchronous

BUS CONTROLLER (BC)

STAND-ALONE REMOTE TERMINAL (SRT)

EMBEDDED REMOTE TERMINAL (ERT)

MONITORING TERMINAL (MT)

TRANSMISSION MEDIA

WORD FORMATS

MESSAGE FORMATS

CONTROL FORMATS

COMMAND WORD

DATA WORD

STATUS WORD

SYNC

19181716151413121110987654321 20

TERMINAL

ADDRESS

T

R

SUBADDRESS

OR MODE

WORD COUNT

MODE CODE

P

Parity

19181716151413121110987654321 20

P

Parity

16 BIT DATA

SYNC

19181716151413121110987654321 20

TERMINAL

ADDRESS

P

SYNC

Message E

rror

Instru

men

tation

Service R

equ

est

Res erv ed

Broad

cast CM

D

Recei ve

Bu

sy

Su

bsystem

Flag

Dyn

amic B

us

Accep

tance

Ter m

inal F

la g

Parity

BUS CONTROLLER TO REMOTE TERMINAL

REMOTE TERMINAL TO BUS CONTROLLER

REMOTE TERMINAL TO REMOTE TERMINAL

RECEIVE

COMMAND

DATA

WORD

DATA

WORD

DATA

WORD

STATUS

WORD* * * *

BC RT

TRANSMIT

COMMAND

STATUS

WORD

DATA

WORD

DATA

WORD

DATA

WORD* * * *

BC RT

* * * *

BC RT ( R )

RECEIVE

COMMAND

TRANSMIT

COMMAND

STATUS

WORD

DATA

WORD

DATA

WORD

STATUS

WORD

RT( T )

*

Mode

Command

Mode

Command

Mode

Command

Status Word

Status Word

Status Word

Data Word

Data Word

Mode Command Without Data Word

Mode Command With Data Word (Transmit)

Mode Command With Data Word (Receive)

* *

* *

* *

Receive Command

Data Word

Data Word

Receive Command

Mode Command

Mode Command

Transmit Command

Status Word

Data Word

Data Word

Data Word

* *

* *

Data Word

Bus Controller To RTs Transfer

RT To RTs Transfer

Mode Command Without Data Word

Mode Command With Data Word

SINGLE BUS SYSTEM

MULTIPLE BUS SYSTEM

Pseudo Time Slot

Polled Sequence Operation

RT1 RT2

MIL-STD 1553B DATA BUS

ARINC 629 DATA BUS

ADC EMS

RXDS

GATEWAY

GATEWAY BETWEEN MIL-STD-1553B & ARINC 629