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Standard

A Primer of Aircraft Multiplexing

1972-01-01
CURRENT
AIR1207
Today's sophisticated aircraft are required to effectively perform a variety of missions. With the advent of micro-miniaturization in electronics and advanced digital computers, a new generation of avionics equipment and systems can be utilized to increase the capabilities of the aircraft. As the quantity and variety of equipment and functions increases, the problems of inter-connecting these equipments with wires presents a constraint on size, weight, signal conditioning, reliability, maintainability and electromagnetic control. Conventional wiring has resulted in large bundles of wires and many connectors which adds excessive weight and reduces the space available for the pilot and other vital elements. This limitation can be relieved significantly by the application of well proven multiplexing techniques.
Standard

Optical Implementation Relating to the High Speed Ring Bus (HSRB) Standard

2012-05-03
CURRENT
AS4075/1A
This SAE Aerospace Standard (AS) has been prepared by the Ring Implementation Task Group of the SAE AS-2 Committee. It is intended as a companion document to the SAE AS4075 High Speed Ring Bus Standard. While the Standard is intended to provide as complete a description as possible of an HSRB implementation, certain parameters are system-dependent and evolutionary. This document contains those parameters. The text through Table 1 is intended to provide definitions and descriptions applicable to all applications. Table 2 contains specific parameter values for one or more implementations. This table will change as new systems are implemented or new HSRB speed options are defined.
Standard

High Speed Ring Bus (HSRB) Standard

2012-05-03
CURRENT
AS4075A
A fault tolerant, real time high speed data communication standard is defined based on a ring topology and the use of a Token passing access method with distributed control. The requirements for the HSRB standard have been driven predominantly, but not exclusively, by military applications. Particular attention has been given to the need for low message latency, deterministic message priority and comprehensive reconfiguration capabilities. This document contains a definition of the semantics and protocol including delimiters, tokens, message priority, addressing, error detection and recovery schemes; and is written to be independent of bit rate and media. Parameters related to particular media and bit rates are defined in separate documents, the AS4075 slash sheets.
Standard

OPTICAL IMPLEMENTATION RELATING TO THE HIGH SPEED RING BUS (HSRB) STANDARD

1995-01-01
HISTORICAL
AS4075/1
This SAE Aerospace Standard (AS) has been prepared by the Ring Implementation Task Group of the SAE AS-2 Committee. It is intended as a companion document to the SAE AS4075 High Speed Ring Bus Standard. While the Standard is intended to provide as complete a description as possible of an HSRB implementation, certain parameters are system-dependent and evolutionary. This document contains those parameters. The text through Table 1 is intended to provide definitions and descriptions applicable to all applications. Table 2 contains specific parameter values for one or more implementations. This table will change as new systems are implemented or new HSRB speed options are defined.
Standard

HIGH SPEED RING BUS (HSRB) STANDARD

1988-08-29
HISTORICAL
AS4075
A fault tolerant, real time high speed data communication standard is defined based on a ring topology and the use of a Token passing access method with distributed control. The requirements for the HSRB standard have been driven predominantly, but not exclusively, by military applications. Particular attention has been given to the need for low message latency, deterministic message priority and comprehensive reconfiguration capabilities. This document contains a definition of the semantics and protocol including delimiters, tokens, message priority, addressing, error detection and recovery schemes; and is written to be independent of bit rate and media. Parameters related to particular media and bit rates are defined in separate documents, the AS4075 slash sheets.
Standard

Type F-1 Fiber Optic Media Interface Characteristics

2016-10-21
CURRENT
AS4074/1B
This slash sheet specifies the operational parameters and characteristics of a particular implementation of the SAE Linear, Token Passing Bus (LTPB) Interface Unit. This slash sheet defines the following: The physical media interface: This slash sheet specifies the characteristics of the optical interface to the physical bus media. The minimum and maximum timing requirements for operation of this implementation of the LTPB. The data coding used to encode and decode the data for transmission. The default values to be loaded into the timers of the LTPB interface at power-up prior to intervention by the host processor.
Standard

Type F-1 Fiber Optic Media Interface Characteristics

2004-10-14
HISTORICAL
AS4074/1A
This slash sheet specifies the operational parameters and characteristics of a particular implementation of the SAE Linear, Token Passing Bus (LTPB) Interface Unit. This slash sheet defines the following: The physical media interface: This slash sheet specifies the characteristics of the optical interface to the physical bus media. The minimum and maximum timing requirements for operation of this implementation of the LTPB. The data coding used to encode and decode the data for transmission. The default values to be loaded into the timers of the LTPB interface at power-up prior to intervention by the host processor.
Standard

Linear Token Passing Multiplex Data Bus

1993-12-01
HISTORICAL
AS4074
This standard specifies the characteristics of the SAE Linear Token Passing Bus (LTPB) Interface Unit. The LTPB provides a high reliability, high bandwidth, low latency serial interconnection network suitable for utilization in real time military and commercial applications. Multiple redundant data paths can be implemented to enhance reliability and survivability in those applications which require these attributes. The token passing and data exchange protocols are optimized to provide low latency and fast failure detection and correction. Physical configurations with bus lengths up to 1000 m can be accommodated. This specification defines the following: General Description (3.1): An overview of the LTPB protocol. Physical Media Interface (3.2): This portion of the standard defines the physical interface to both optical and electrical bus media.
Standard

Type F-1 Fiber Optic Media Interface Characteristics

1993-12-01
HISTORICAL
AS4074/1
This slash sheet specifies the operational parameters and characteristics of a particular implementation of the SAE Linear, Token Passing Bus (LTPB) Interface Unit. This slash sheet defines the following: The physical media interface: This slash sheet specifies the characteristics of the optical interface to the physical bus media. The minimum and maximum timing requirements for operation of this implementation of the LTPB. The data coding used to encode and decode the data for transmission. The default values to be loaded into the timers of the LTPB interface at power-up prior to intervention by the host processor.
Standard

Type E-1 Electrical Media Interface Characteristics

1993-12-01
HISTORICAL
AS4074/3
This slash sheet specifies the operational parameters and characteristics of a particular implementation of the SAE Linear, Token Passing Bus (LTPB) Interface Unit. This slash sheet defines the following: The physical media interface: This slash sheet specifies the characteristics of the electrical interface to the physical bus media. The minimum and maximum timing requirements for operation of this implementation of the LTPB. The data coding used to encode and decode the data for transmission. The default values to be loaded into the timers of the LTPB interface at power-up prior to intervention by the host processor.
Standard

Linear Token Passing Multiplex Data Bus

2017-02-21
CURRENT
AS4074B
This standard specifies the characteristics of the SAE Linear Token Passing Bus (LTPB) Interface Unit. The LTPB provides a high reliability, high bandwidth, low latency serial interconnection network suitable for utilization in real time military and commercial applications. Multiple redundant data paths can be implemented to enhance reliability and survivability in those applications which require these attributes. The token passing and data exchange protocols are optimized to provide low latency and fast failure detection and correction. Physical configurations with bus lengths up to 1000 m can be accommodated. This specification defines the following: General Description (3.1): An overview of the LTPB protocol. Physical Media Interface (3.2): This portion of the standard defines the physical interface to both optical and electrical bus media.
Standard

Linear Token Passing Multiplex Data Bus

2004-10-14
HISTORICAL
AS4074A
This standard specifies the characteristics of the SAE Linear Token Passing Bus (LTPB) Interface Unit. The LTPB provides a high reliability, high bandwidth, low latency serial interconnection network suitable for utilization in real time military and commercial applications. Multiple redundant data paths can be implemented to enhance reliability and survivability in those applications which require these attributes. The token passing and data exchange protocols are optimized to provide low latency and fast failure detection and correction. Physical configurations with bus lengths up to 1000 m can be accommodated. This specification defines the following: General Description (3.1): An overview of the LTPB protocol. Physical Media Interface (3.2): This portion of the standard defines the physical interface to both optical and electrical bus media.
Standard

Type E-1 Electrical Media Interface Characteristics

2016-10-21
CURRENT
AS4074/3B
This slash sheet specifies the operational parameters and characteristics of a particular implementation of the SAE Linear, Token Passing Bus (LTPB) Interface Unit. This slash sheet defines the following: The physical media interface: This slash sheet specifies the characteristics of the electrical interface to the physical bus media. The minimum and maximum timing requirements for operation of this implementation of the LTPB. The data coding used to encode and decode the data for transmission. The default values to be loaded into the timers of the LTPB interface at power-up prior to intervention by the host processor.
Standard

Type F-2 Fiber Optic Media Interface Characteristics

2016-10-21
CURRENT
AS4074/2B
This slash sheet specifies the operational parameters and characteristics of a particular implementation of the SAE Linear, Token Passing Bus (LTPB) Interface Unit. This slash sheet defines the following: The physical media interface: This slash sheet specifies the characteristics of the optical interface to the physical bus media. The minimum and maximum timing requirements for operation of this implementation of the LTPB. The data coding used to encode and decode the data for transmission. The default values to be loaded into the timers of the LTPB interface at power-up prior to intervention by the host processor.
Standard

Type F-2 Fiber Optic Media Interface Characteristics

2004-10-14
HISTORICAL
AS4074/2A
This slash sheet specifies the operational parameters and characteristics of a particular implementation of the SAE Linear, Token Passing Bus (LTPB) Interface Unit. This slash sheet defines the following: The physical media interface: This slash sheet specifies the characteristics of the optical interface to the physical bus media. The minimum and maximum timing requirements for operation of this implementation of the LTPB. The data coding used to encode and decode the data for transmission. The default values to be loaded into the timers of the LTPB interface at power-up prior to intervention by the host processor.
Standard

Type F-2 Fiber Optic Media Interface Characteristics

1993-12-01
HISTORICAL
AS4074/2
This slash sheet specifies the operational parameters and characteristics of a particular implementation of the SAE Linear, Token Passing Bus (LTPB) Interface Unit. This slash sheet defines the following: The physical media interface: This slash sheet specifies the characteristics of the optical interface to the physical bus media. The minimum and maximum timing requirements for operation of this implementation of the LTPB. The data coding used to encode and decode the data for transmission. The default values to be loaded into the timers of the LTPB interface at power-up prior to intervention by the host processor.
Standard

Type E-1 Electrical Media Interface Characteristics

2004-10-14
HISTORICAL
AS4074/3A
This slash sheet specifies the operational parameters and characteristics of a particular implementation of the SAE Linear, Token Passing Bus (LTPB) Interface Unit. This slash sheet defines the following: The physical media interface: This slash sheet specifies the characteristics of the electrical interface to the physical bus media. The minimum and maximum timing requirements for operation of this implementation of the LTPB. The data coding used to encode and decode the data for transmission. The default values to be loaded into the timers of the LTPB interface at power-up prior to intervention by the host processor.
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