Fiber Optic Wiki

Power sourcing equipment

December 6, 2011

Power sourcing equipment (PSE) is a device such as a switch that provides ("sources") power on the Ethernet cable. The maximum allowed continuous output power per cable in IEEE 802.3af is 15.40 W. A later specification, IEEE 802.3at, offers 25.50 W.

Internet service provider

December 6, 2011

An Internet service provider (ISP) is a company that provides access to the Internet. Access ISPs directly connect customers to the Internet using copper wires, wireless or fiber-optic connections.

Passive Component

December 6, 2011

A passive component is designed to route light energy from an input port to one or several output ports while losing as little energy as possible. The component must be stable and insensitive to environmental stress as well as insensitive to the state of polarization.

Category 2 cable and category 5 cable

December 5, 2011

Category 2 cable, or simply Cat 2, is a misnomer, probably adopted by those who assumed that the Telecommunications Industry Association set up "Categories" for all types of cables originally defined by Anixter, the distributor, under the grades called Levels. TIA-568 only recognized cables of Category 3 ratings or above. Anixter Level 2 was a grade of UTP cable capable of transmitting data at up to 4 Mbit/s.

Cable standard and specification for Category 5 cable

December 5, 2011

The specification for Category 5 cable was defined in ANSI/TIA/EIA-568-A, with clarification in TSB-95.These documents specified performance characteristics and test requirements for frequencies of up to 100 MHz. Cable types, connector types and cabling topologies are defined by TIA/EIA-568-B. The cable is terminated in either the T568A scheme or the T568B scheme.

Read now Copper cable certification

December 5, 2011

In copper twisted pair wire networks, copper cable certification is achieved through a thorough series of tests in accordance with Telecommunications Industry Association (TIA) or International Organization for Standardization (ISO) standards. These tests are done using a certification-testing tool, which provide “Pass” or “Fail” information. While certification can be performed by the owner of the network, certification is primarily done by datacom contractors. It is this certification that allows the contractors to warranty their work.

|< < .... 45 46 47 48 49 50 51 52 53 54 55 .... > >|

Showing 295 to 300 of 1106 (185 Pages)