This document discusses MIL-STD-1553, a military standard that defines the protocol for an aircraft's internal data bus. It allows different avionics subsystems to communicate by standardizing electrical interfaces and data formatting. Key aspects covered include the 1Mbps data rate, 32-word message lengths, Manchester II encoding, and the bus controller/remote terminal architecture with command-response transmission. The standard has been widely adopted for military and civil aircraft integration and certification.

2. 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

3. 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

4. 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

6. 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

7. 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

8. 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

9. BUS CONTROLLER (BC)
STAND-ALONE REMOTE TERMINAL (SRT)
EMBEDDED REMOTE TERMINAL (ERT)
MONITORING TERMINAL (MT)
TRANSMISSION MEDIA

13. WORD FORMATS
MESSAGE FORMATS
CONTROL FORMATS

14. COMMAND WORD
DATA WORD
STATUS WORD

16. SYNC
19181716151413121110987654321 20
TERMINAL
ADDRESS
T
R
SUBADDRESS
OR MODE
WORD COUNT
MODE CODE
P
Parity

17. 19181716151413121110987654321 20
P
Parity
16 BIT DATA
SYNC

18. 19181716151413121110987654321 20
TERMINAL
ADDRESS
P
SYNC
MessageError
Instrumentation
ServiceRequest
Reserved
BroadcastCMD
Receive
Busy
SubsystemFlag
DynamicBus
Acceptance
TerminalFlag
Parity

19. BUS CONTROLLER TO REMOTE TERMINAL
REMOTE TERMINAL TO BUS CONTROLLER
REMOTE TERMINAL TO REMOTE TERMINAL

21. RECEIVE
COMMAND
DATA
WORD
DATA
WORD
DATA
WORD
STATUS
WORD
* * * *
BC RT

22. TRANSMIT
COMMAND
STATUS
WORD
DATA
WORD
DATA
WORD
DATA
WORD
* * * *
BC RT

23. * * * *
BC RT ( R )
RECEIVE
COMMAND
TRANSMIT
COMMAND
STATUS
WORD
DATA
WORD
DATA
WORD
STATUS
WORD
RT( T )
*

24. 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)
* *
* *
* *

25. 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

27. SINGLE BUS SYSTEM
MULTIPLE BUS SYSTEM

32. Pseudo Time Slot
Polled Sequence Operation

34. RT1 RT2
MIL-STD 1553B DATA BUS
ARINC 629 DATA BUS
ADC EMS
RX
DS
GATEWAY
GATEWAY BETWEEN MIL-STD-1553B & ARINC 629