'
Title 47 CFR Part 68
'' is a section of the

Code of Federal Regulations In the law of the United States, the ''Code of Federal Regulations'' (''CFR'') is the codification of the general and permanent regulations promulgated by the executive departments and agencies of the federal government of the United States. ...

of the United States that regulate the direct electrical connection of telecommunications equipment and

customer premises wiring On-premises wiring (customer premises wiring) is customer-owned telecommunication transmission (telecommunications), transmission or distribution lines. The transmission lines may be metallic (copper) or optical fiber, and may be installed withi ...

with the

public switched telephone network The public switched telephone network (PSTN) provides infrastructure and services for public telecommunication. The PSTN is the aggregate of the world's circuit-switched telephone networks that are operated by national, regional, or local telep ...

, certain

private line In telecommunication, a private line is typically a telephone company service that uses a dedicated, usually unswitched point-to-point circuit, but it may involve private switching arrangements, or predefined transmission physical or virtual path ...

services, and connection of private branch exchange (PBX) equipment to certain

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 ...

interfaces.

Scope

*The direct connection of telecommunications equipment and

with the

and certain

services, such as **foreign exchange lines at the customer premises end **the station end of off-premises stations associated with PBX and

Centrex Centrex is a portmanteau of central exchange, a kind of telephone exchange. It provides functions similar to a PBX, but is provisioned with equipment owned by, and located at, the telephone company premises. Centrex service was first installed ...

services **

trunk Trunk may refer to: Biology * Trunk (anatomy), synonym for torso * Trunk (botany), a tree's central superstructure * Trunk of corpus callosum, in neuroanatomy * Elephant trunk, the proboscis of an elephant Computing * Trunk (software), in rev ...

-to-station tie lines at the trunk end only **switched service network station lines, ''i.e.'',

common control In telecommunications, common control is a principle of switching telephone calls in an automatic telephone exchange that employs shared control equipment which is attached to the circuit of a call only for the duration of establishing or otherwise ...

switching arrangements *The direct connection of **all PBX and similar systems to private line services for

tie trunk A tie line, also known as a tie trunk, is a telecommunication circuit between two telephone exchanges or two extensions of a private telephone system. See also *Private branch exchange * Circuit ID *Leased line *Private line In telecommunication ...

type interfaces, **off-premises station lines, and (3) automatic identified outward dialing (

AIOD In land-line telephony, AIOD leads are Terminal equipment leads used solely to transmit automatic identified outward dialing (AIOD) data from a PBX to the public switched telephone network or to switched service networks (''e.g.,'' EPSCS), so t ...

) and

message A message is a discrete unit of communication intended by the source for consumption by some recipient or group of recipients. A message may be delivered by various means, including courier, telegraphy, carrier pigeon and electronic bus. A ...

registration Register or registration may refer to: Arts entertainment, and media Music * Register (music), the relative "height" or range of a note, melody, part, instrument, etc. * ''Register'', a 2017 album by Travis Miller * Registration (organ), th ...

. Part 68 rules provide the technical and procedural standards under which direct electrical connection of customer-provided

telephone A telephone is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be easily heard directly. A telephone converts sound, typically and most efficiently the human voice, into e ...

equipment, systems, and protective apparatus may be made to the nationwide

network Network, networking and networked may refer to: Science and technology * Network theory, the study of graphs as a representation of relations between discrete objects * Network science, an academic field that studies complex networks Mathematic ...

without causing harm and without a requirement for protective circuit arrangements in the service-provider networks. The equivalent European regulation is called

TBR21 TBR21 is a European telecommunications standard published by ETSI, and is the standard to which all telephone equipment must adhere to, to be allowed connection to Europe's public switched telephone network. It is somewhat equivalent to the US ...

References

FCC 47 CFR Part 68
section 68.502 superseded by T1.TR5-1999

External links

ACTA documentsT1.TR5-1999
Local loop United States communications regulation Code of Federal Regulations {{telephony-stub