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The bus only supports a single MAC as the master, and can have up to 32 PHY slaves. The MDC can be periodic, with a minimum period of 400 ns, which corresponds to a maximum frequency of 2.5 MHz. Newer chips, however, allow faster accesses. For example, the DP83640 supports a 25 MHz maximum clock rate for MDC.
Standard No. 221 – School Bus Body Joint Strength: April 1, 1977: This established requirements for the strength of the body panel joints in school bus bodies, to reduce deaths and injuries resulting from structural collapse of school bus bodies during crashes. Standard No. 222 – School Bus Passenger Seating and Crash Protection: April 1, 1977
Illustration of the 4+1 Architectural View Model. 4+1 is a view model used for "describing the architecture of software-intensive systems, based on the use of multiple, concurrent views". [1] The views are used to describe the system from the viewpoint of different stakeholders, such as end-users, developers, system engineers, and project managers.
The Blue Bird Corporation (originally known as the Blue Bird Body Company) is an American bus manufacturer headquartered in Fort Valley, Georgia.Best known for its production of school buses, the company has also manufactured a wide variety of other bus types, including transit buses, motorhomes, and specialty vehicles such as mobile libraries and mobile police command centers.
The division offered its conventional school bus chassis with Chevrolet-produced engines, including the 250 inline-6 (replaced by the 292 inline-6), 366 V8, and 427 V8. [1] In both Chevrolet and GMC school buses, the Allison AT475 3-speed automatic transmission became an option in 1971 with single or two-speed rear axles.
IEC 61850 is an international standard defining communication protocols for intelligent electronic devices at electrical substations.It is a part of the International Electrotechnical Commission's (IEC) Technical Committee 57 reference architecture for electric power systems. [1]
It is still difficult for systems designers to build machines that allow finished products to be inspected easily. To do so requires an understanding of the product being manufactured and how inspection tasks can improve the quality control process. [3] Inspection can represent a significant percentage of an existing product's manufacturing cost.
The Simple Bus Architecture [1] (SBA) is a form of computer architecture. It is made up software tools and intellectual property cores interconnected by buses using simple and clear rules, that allow the implementation of an embedded system . Basic templates are provided to accelerate design.
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