In telecommunications, a distribution frame is a passive device which terminates cables, allowing arbitrary interconnections to be made.
For example, the Main Distribution Frame (MDF) located at a telephone central office terminates the cables leading to subscribers on the one hand, and cables leading to active equipment (such as DSLAMs and telephone switches) on the other. In Telephony, a Main Distribution Frame ( MDF or Main Frame) is a signal Distribution frame for connecting equipment ( Inside plant) In the field of Telecommunications, a telephone exchange or telephone switch is a system of electronic components that connects telephone calls The subscription business model is a Business model where a customer must pay a subscription price to have access to the product/service A Digital Subscriber Line Access Multiplexer ( DSLAM, often pronounced dee-slam) allows Telephone lines to make faster connections to the Internet In the field of Telecommunications, a telephone exchange or telephone switch is a system of electronic components that connects telephone calls Service is provided to a subscriber by manually wiring a twisted pair (called a jumper wire) between the telephone line and the relevant DSL or POTS line circuit. The subscription business model is a Business model where a customer must pay a subscription price to have access to the product/service Twisted pair Cabling is a form of wiring in which two conductors (two halves of a single circuit) are wound together for the purposes of canceling out A telephone line or telephone circuit (or just line or circuit within the Industry) is a single-user circuit on a Telephone
In broadcast engineering, a distribution frame is a location within an apparatus room through which all signals (audio, video, or data) pass, with the ability to arbitrarily route and connect sources and destinations between studios and other internal and external points. Broadcast engineering is the field of Electrical engineering, and now to some extent Computer engineering, which deals with Radio and Television In Telecommunication, signalling (UK spelling or signaling (US spelling has the following meanings The use of signals for controlling communications Sound' is Vibration transmitted through a Solid, Liquid, or Gas; particularly sound means those vibrations composed of Frequencies Video is the technology of electronically capturing, Recording, processing storing transmitting and reconstructing a sequence of Still images Debt AIDS Trade in Africa (or DATA) is a Multinational non-government organization founded in January 2002 in London by U2 's A studio is a Artist 's or worker's workroom or an artist and his or her Employees who work within that studio Connections can either be soldered, or made using terminal blocks. A solder is a fusible metal Alloy with a melting point or melting range of 90 to 450 ° C (200 to 840 ° F) used in a process called A screw terminal is a type of Electrical connector where a Wire is clamped down to Metal by a Screw. Because the frame may carry live broadcast signals, it may be considered part of the airchain. In Broadcast engineering for radio the airchain (sometimes air chain (US or just chain (UK is the path or route an audio or Video
Newer digital mixing consoles can act as control points for a distribution frame or router, which can handle audio from multiple studios (even for multiple co-located radio or tv stations) at the same time. A digital system uses discrete (discontinuous values usually but not always Symbolized Numerically (hence called "digital" to represent information for In professional audio, a mixing console, or audio mixer, also called a sound board or soundboard, is an electronic device for combining A router ('rautər in the USA 'rutər in the UK and Ireland, or either pronunciation in Australia and Canada is a Computer whose software and hardware are usually This article is about radio broadcasting for other uses see Radio (disambiguation. A television station is a type of broadcast station that broadcasts both audio and Video to Television receivers in a particular area Multiple smaller frames, such as one for each studio, can be linked together with fibre-optics (which also helps eliminate ground loops), or with gigabit Ethernet. Gigabit Ethernet (GbE or 1 GigE is a term describing various technologies for transmitting Ethernet frames at a rate of a gigabit per second, as defined by the This has the advantage of not having to route dozens of feeds through walls (and sometimes floors and ceilings) to a single point. A wall is a usually solid structure that defines and sometimes protects an area A floor is the walking surface of a room or vehicle Floors vary from simple dirt in a cave to many-layered surfaces using modern technology A ceiling is an overhead interior surface that bounds the upper limit of a room.
Distribution frames for specific types of signals often have specific acronyms:
- ADF - audio distribution frame
- DDF - digital distribution frame
- VDF - video distribution frame
- ODF - optical fiber distribution frame
Distribution frames may grow to extremely large sizes. Sound' is Vibration transmitted through a Solid, Liquid, or Gas; particularly sound means those vibrations composed of Frequencies A digital system uses discrete (discontinuous values usually but not always Symbolized Numerically (hence called "digital" to represent information for Video is the technology of electronically capturing, Recording, processing storing transmitting and reconstructing a sequence of Still images An optical fiber (or fibre) is a Glass or Plastic fiber that carries Light along its length In major installations, audio distribution frames can have as many as 10,000 incoming and outgoing separate copper wires. (Balanced audio signals require two wires plus earth ground for each signal). Balanced audio is a method of interconnecting audio equipment using impedance-balanced lines. In Electrical engineering, the term ground or earth has several meanings depending on the specific application areas
Telephone signals do not use a separate earth ground wire, but some urban exchanges have about 250,000 wires on their MDF. In the field of Telecommunications, a telephone exchange or telephone switch is a system of electronic components that connects telephone calls In Telephony, a Main Distribution Frame ( MDF or Main Frame) is a signal Distribution frame for connecting equipment ( Inside plant) Installing and rewiring these jumpers is a labour-intensive task, leading to attempts in the industry to devise so-called active distribution frames or Automated Main Distribution Frames. Automated Main Distribution Frame (AMDF, (automated switching matrix automated distribution frame Loop Management System (LMS a technology to provide connectivity between subscriber The principal issues which stand in the way of their widespread adoption are cost and reliability.
For optical fiber distribution frames, see the patent 7,142,765 cited below.
See also
Intermediate distribution frame
Patents
- US 7,142,765 -- High Density Optical Fiber Distribution Frame