telecommunication Telecommunication is the transmission of information by various types of technologies over wire, radio, optical, or other electromagnetic systems. It has its origin in the desire of humans for communication over a distance greater than that fe ...

, the term inside plant has the following meanings: *All the cabling and equipment installed in a

telecommunications facility In telecommunications, a facility is defined by Federal Standard 1037C as: # A fixed, mobile, or transportable structure, including (a) all installed electrical and electronic wiring, cabling, and equipment and (b) all supporting structures, such as ...

, including the

main distribution frame In telephony, a main distribution frame (MDF or main frame) is a signal distribution frame for connecting equipment (inside plant) to cables and pair gain, subscriber carrier equipment (outside plant). Overview The MDF is a termination point wi ...

(MDF) and all the equipment extending inward therefrom, such as

PABX A business telephone system is a multiline telephone system typically used in business environments, encompassing systems ranging in technology from the key telephone system (KTS) to the private branch exchange (PBX). A business telephone syst ...

or central office equipment, MDF

heat coil Heat coils, also known as ''protectors'', ''bugs'' or ''carbons'' serve as a surge protector between the telephone exchange and outside plant. They are commonly the last point of appearance for a telephone circuit before it leaves the office, for ...

protectors, and grounding systems. *In

radio Radio is the technology of signaling and communicating using radio waves. Radio waves are electromagnetic waves of frequency between 30 hertz (Hz) and 300 gigahertz (GHz). They are generated by an electronic device called a transmi ...

and

radar Radar is a detection system that uses radio waves to determine the distance ('' ranging''), angle, and radial velocity of objects relative to the site. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, we ...

systems, all communications-electronics (C-E) equipment that is installed in buildings. Around the turn of the 21st century,

DSLAM A digital subscriber line access multiplexer (DSLAM, often pronounced ''DEE-slam'') is a network device, often located in telephone exchanges, that connects multiple customer digital subscriber line (DSL) interfaces to a high-speed digital ...

s became an important part of

telephone company A telephone company, also known as a telco, telephone service provider, or telecommunications operator, is a kind of communications service provider (CSP), more precisely a telecommunications service provider (TSP), that provides telecommunicat ...

inside plant. Inside plant will also have

distribution frame Distribution may refer to: Mathematics *Distribution (mathematics), generalized functions used to formulate solutions of partial differential equations *Probability distribution, the probability of a particular value or value range of a varia ...

s and other equipment including

passive optical network A passive optical network (PON) is a fiber-optic telecommunications technology for delivering broadband network access to end-customers. Its architecture implements a point-to-multipoint topology in which a single optical fiber serves multiple e ...

(name depends on the Service Provider).

Power

A typical power system for a switching office in an inside plant consists of the elements listed below: *AC power system **AC input switch gear **Standby AC plant (where appropriate) **AC distribution system (essential and non-essential loads) **AC backup systems for uninterruptible loads and protected loads *DC power system **Rectifiers and plant controls **

Storage batteries A rechargeable battery, storage battery, or secondary cell (formally a type of energy accumulator), is a type of electrical battery which can be charged, discharged into a load, and recharged many times, as opposed to a disposable or prima ...

**DC distribution system. For safety and reliability reasons, it is desirable that all telecommunications loads be DC powered with minimal AC-powered devices used. Telcordi
GR-513, Power Requirements in Telecommunications Plant (LSSGR Section 13)
contains detailed industry requirements for using power in an inside plant. Both integrated and isolated bonding networks as per Telcordi
GR-295, Mesh and Isolated Bonding Networks: Definition and Application to Telephone Central Offices
are a technically viable means to ground and bond the equipment in a safe and effective manner. However, the integrated or mesh bonding schemes are preferred over isolated bonding networks because of the added costs and efforts required to manage, control, and maintain the isolation for the equipment, particularly during equipment upgrade and modifications to the plant. This preference is based on a pragmatic desire for lower costs and ease of management, and to simplify operations during plant modifications/upgrades. For a comprehensive analysis of the energy efficiency and environmental soundness of a power system, one should ideally consider a wider range of factors than strict energy conversion AC-to-DC power efficiency. These environmental factors cover a wider vision known as

Industrial Ecology Industrial ecology (IE) is the study of material and energy flows through industrial systems. The global industrial economy can be modelled as a network of industrial processes that extract resources from the Earth and transform those resource ...

within which each manufacturing step of the products need to be considered from a Design for Environment (DfE) factors standpoint.

Sources

* Telecommunications infrastructure {{telecommunications-stub

Power

See also

Sources