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Membership Types
Committee members have a leading role in
establishing and deploying time-triggered technology and developing
related specifications. Committee members can
- obtain access to foreground intellectual property,
- monitor the secured access to background intellectual property,
- control the further development of the related specifications,
- vote in TTA-Group's steering committee and technical committee,
- decide the application for new memberships,
- have representatives in working groups,
- have their logo included on the TTA-Group web site, in announcements
and other marketing material.
Associate members have a leading role in
providing products for time-triggered technology and in the development
of related specifications. Typically, associate members are semiconductor
and software manufacturers. Associate members can
- obtain access to foreground intellectual property,
- monitor the secured access to background intellectual property,
- make change proposals for specifications,
- vote in TTA-Group's technical committee,
- have representatives in working groups,
- have their logo included on the TTA-Group web site, in announcements
and other marketing material.
Affiliate members promote time-triggered
technology. They can
- obtain early access to working group results,
- appoint representatives to working groups upon invitation by
the steering committee,
- have their logo included on the TTA-Group web site, in announcements
and other marketing material.
If you are interested in joining TTA-Group, please apply for membership
via the Application Form or
contact us directly at coordinator@ttagroup.org.
Committees and Governing
Bodies
Steering Committee
Up to two representatives and one vote per Committee
Member. This committee decides TTA-Group's strategy and policy.
Technical Committee
Up to two representatives and one vote per Committee
Member and per Associate Member. This
committee drafts and interprets technical specifications.
Technical Working Groups
Open to Committee and Associate Members.
These groups are responsible for developing the technology.
More details can be found at Working Groups.
TTA-Group Coordinator and Secretary
Appointed by the steering committee and responsible for the administration
of the TTA-Group activities.
Working Groups
Several companies from the aerospace, off-highway vehicles, railway,
and industrial control industry, their suppliers, and semiconductor
and software manufacturers cooperate in working groups. Participants
profit from the experience and know-how of the individual members.
Several working groups are established by the TTA-Group steering
committee. Examples are:
Protocol Working Group
The protocol working group's task is to further develop the Time-Triggered
Protocol TTP.
The specification of the protocol describes the services and mechanisms
at an abstract level without implementation-specific details. Additionally,
several mechanisms for specific applications and configurations
are defined.
One of the results of the protocol working group is the release
of the TTP specification versions 1.0 and 1.1. The new functions
are a further improvement of TTP with regards to safety and data
efficiency. The changes have already been validated in several project
studies. The protocol changes are
- higher data throughput with data frames of up to 240 bytes with
24-bit CRC and a typical net data rate of about 80%,
- support of components with arbitrary faults,
- tolerance of spatial proximity faults,
- tolerance of "start-up clique faults", and
- noise tolerance.
The specification is completely independent from specific controller
implementations.
Conformance Test Working Group
This working group develops a series of specifications and tests
to make sure that components and network nodes work correctly with
different physical layers and the communication protocol.
Two types of validation need to be executed:
- Component level:
- Physical layers
- Protocol layer
- Node / integrated system level:
- Test specification at component level
- Test specification for integrated systems
Physical Layer Working Group
As a result of the TTA-Group physical layer working group, the physical
layer specification for TTP has been finalized.
Implementations based on the TTP physical layer specification will
exceed currently available transceivers in
- support for data rates of up to 10 Mbit/s,
- defined bus idle behavior without bus biasing, defined (fail-silent)
common mode behavior,
- compatibility to 42V PowerNet,
- adaptation to communication controller supply voltage (2.5V,
3.3V, 5V), and
- diagnostics and wake-up function.
If you would like to get more information about the TTP physical
layer specification please go to TTP
Physical Layer - Status or contact info@ttagroup.org.
Steer-by-Wire Working Group
This working group focuses on the requirements in the area of safety-critical
applications, e.g. steer-by-wire systems, for special-purpose and
heavy goods vehicles such as off-highway vehicles for agriculture,
construction, material handling, road building, and forestry. It
promotes and advances all measures needed for launching the commercial
production of time-triggered applications, to avoid double effort,
and to ensure that resources are efficiently used for developing
appropriate steering products with a technology for the future including:
- legal requirements for such a launch
- norms and standards to be considered
- required certification processes
- electronic architecture and necessary communication system
- exchange of expertise with safety-critical systems
- common cause for suppliers and manufacturers
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