3‑E “Optical Fiber Cabling and Components Standard” was developed by the TIA TR‑42. The first ITU-T Handbook related to optical fibres, Optical Fibres for Telecommunications, was published in 1984, and several others have been produced over the years. It is an honour to present you with the latest version, which is another example of how ITU-T is bridging the standardization gap. Parallel optic interfaces (POIs) are a fiber optic technology primarily targeted for short reach multimode fiber systems (typically less than 300 meters), and high data rates, 10 Gigabits per second (10G). Scope: This Standard specifies performance, transmission, and test and measurement requirements for premises optical fiber cable. Abstract: The design, installation, and protection of wire and cable systems in substations are covered in this guide, with the objective of minimizing cable failures and their consequences. Copyright © 2008 by the Institute of Electrical and Electronics Engineers, Inc. This document introduces the cable requirements for 40-Gbps infrastructure and fundamental cabling principles supporting Cisco Nexus® 9000 Series Switches. Althou gh alternative cabling options are mentioned (Twinax and active optical assemblies), the main focus of the document is cabling for. DACs (Direct Attach Copper) is the lowest cost, but after 2-5 meters (rate dependent) the attenuation of the signal is significant and becomes unrecognizable at the receiver.