IEC 60876-1 :2014 pdf download – Fibre optic interconnecting devices and passive components – Fibre optic spatial switches – Part 1: Generic specification.
3.1.8 blocking inability to establish a connection from a free input port to a free output port due to the existence of some other established connection Note 1 to entry: Blocking and various degrees of non-blocking operation functionalities are of various types: “Strict-sense non-blocking” refers to a switch matrix in which it is always possible to establish a connection between any free input port and any free output port, irrespective of previously established connections. “Wide-sense non-blocking” refers to a matrix in which it is always possible to establish a desired connection provided that some systematic procedure is followed in setting up connections. Some multistage switching architectures fall into this category. “Rearrangeably non-blocking” refers to a switch matrix in which any free input port can be connected to any free output port provided that other established connections are unconnected and then reconnected as part of making the new connection. 3.1.9 normally on condition where a port pair is in a conducting state when there is no actuation energy applied for a non-latching switch 3.1.10 normally off condition where a port pair is in an isolated state when there is no actuation energy applied for a non-latching switch 3.2 Component definitions 3.2.1 optical switch passive component processing one or more ports which selectively transmits, redirects or blocks optical power in an optical fibre transmission line 3.2.2 latching switch switch that maintains its last state and specified performance level when the actuation energy which initiated the change is removed 3.2.3 non-latching switch switch that reverts to a home state or undefined state when the actuation energy which initiated a change is removed 3.2.4 magneto-optic effect switch MO switch optical switch which uses the magneto-optic effect (phenomenon of polarization state change in transmitted light and reflected light due to a magnetic field)
Published reference documents produced by the ITU, consistent with the scope statements of the relevant IEC specification series may be used as extensions. Published documents produced by other regional standardization bodies such as ANSI, CENELEC, JIS, etc., may be referenced in a bibliography attached to the generic specification. Some spatial switch configurations require special qualification provisions which shall not be imposed universally. This accommodates individual component design configurations, specialized field tooling or specific application processes. In this case, requirements are necessary to assure repeatable performance or adequate safety and provide additional guidance for complete product specification and they shall be defined in the relevant specification. These extensions are mandatory whenever they are used to prepare, assemble or install a spatial switch either for field application usage or preparation of qualification test specimens. The relevant specification shall clarify all stipulations. However, design and style- dependent extensions shall not be imposed universally. In the event of conflicting requirements, precedence, in descending order, shall be the generic specification over mandatory extension, over blank detail, over detail specification, over application-specific extension. Examples of requirements for normative extensions are as follows: – Some commercial or residential building applications may require direct reference to specific safety codes and regulations or incorporate other specific material flammability or toxicity requirements for specialized locations. – Specialized field tooling may require an extension to implement specific ocular safety, electrical shock, burn hazard avoidance requirements, or require isolation procedures to prevent potential ignition of combustible gases.
4.2.3 4.2.3.1 General The drawings and dimensions given in detail specifications shall not restrict themselves to details of construction, nor shall they be used as manufacturing drawings. 4.2.3.2 Projection system Either first-angle or third-angle projection shall be used for the drawings in documents covered by this specification. All drawings within a document shall use the same projection system and the drawings shall state which system is used. 4.2.3.3 Dimensional system All dimensions shall be given in accordance with ISO 1 29-1 , ISO 286-1 and ISO 1 1 01 . The metric system shall be used in all specifications. Dimensions shall not contain more than five significant digits. When units are converted, a note shall be added in each detail specification. Test and measurement 4.2.4 4.2.4.1 Test and measurement procedures The test and measurement procedures for optical, mechanical and environmental characteristics of switches to be used shall be defined and selected preferably from the IEC 61 300 series. The size measurement method to be used shall be specified in the detail specification for dimensions which are specified within a total tolerance zone of 0,01 mm or less.