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For example, an operating system may provide protection against data, timeliness and resource interference for all programme units within a computer, thus allowing each programme unit (a physical element) to be thought of as an interference free container. Such containers i.e. elements and associated barricades, are architectural units (architectural components) and represent the basic building blocks for non-interference arguments.
2.11  Another feature of barriers, illustrated in the OS example above, is that the protection afforded to the element (the programme unit) may not be part of the element itself
i.e. the barricade is not physically attached to the element. The OS establishes an interference free environment whose properties are inherited by the elements within the computer. Consequently, although the OS may be considered to provide one or more of the barriers in an elements barricade, the implementation of the barrier is not physically part of that element.
2.12  A barricade cannot completely envelop an element, as, to be useful, the functions within it have to communicate with other functions and ultimately, the outside world. Any communication channel can be thought of as a breach in the barricade, allowing interference contained within it to be transferred to the functions in the element. However, the communications channel itself can be protected from interference e.g. an optical bus is protected from radio frequency EM interference and protocols and checksums may be used to protect any data it carries from most forms of corruption. Consequently the communications channel is also an Architectural Unit, protected from the external environment by its own barricade. This concept is illustrated in Figure 2. Systems of architectural units may therefore be built in this way, allowing non-interference arguments to be created for a complete system.

Figure 2 An Architectural system

 

Part B, Section 4, Generic Requirements and Guidance - General
GEN 01 Windfarms
1  Introduction
1.1  A windfarm will comprise one or more Wind Powered Turbine generators.
1.2  This document provides guidance which an Air Traffic Services (ATS) Provider or Air Navigation Service Provider (ANSP) can apply in order to safeguard against the possibility of adverse effects on ATS operations caused by a Windfarm development in the vicinity of an aeronautical radio station. Sources of guidance to facilitate the process of assessment are also provided.

2  Capture by ATS Provider of development proposal
2.1  An ATS Provider or ANSP should be notified of a proposal to develop a Windfarm by the developer. This notification provides the opportunity to enter into consultation with the developer and provide comment, ahead of a formal planning application, on an intention to develop a Windfarm site.
2.2  In order to ensure comprehensive notification of any intended development, ATS Providers and ANSPs are advised to arrange for the relevant Local Planning Authority (LPA) to inform and consult with them, when they receive Windfarm development proposals within a minimum radius of 20 km from their Aerodrome or Radio Site.
2.3  ATS Providers and ANSPs should also ensure that any area of particularly intense aircraft activity, e.g. an approach to a runway, is also considered by the LPA as requiring safeguarding. This will normally be outside the 'standard' 20 km range and may extend to 34 km for ILS approaches. It should be noted that such ranges could require consultation with more than one LPA.

3  Responsibilities and limitations
3.1  Windfarms need to be considered as a safeguarding activity.
3.2  The ATS Provider or ANSP is responsible for ensuring, as far as is reasonably practicable, that such development does not impact on the safety of the ATS environment.
3.3  The ATS Provider or ANSP is responsible for deciding whether or not it can accept any degradation to the ATS environment.
　
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