Plain old telephone servicewikipedia
Plain old telephone service (POTS), or plain ordinary telephone service, is a retronym for voice-grade telephone service employing analog signal transmission over copper loops.
POTSplain old telephone serviceLocal Telephone Servicetelephonewirelinetelephone serviceanalogPhone Servicetraditional telephoneanalog telephone

Integrated Services Digital Network

ISDNintegrated services digital network ISDN
POTS was the standard service offering from telephone companies from 1876 until 1988 in the United States when the Integrated Services Digital Network (ISDN) Basic Rate Interface (BRI) was introduced, followed by cellular telephone systems, and voice over IP (VoIP).
The key feature of ISDN is that it integrates speech and data on the same lines, adding features that were not available in the classic telephone system.

Telephone

telephonephonetelephones
Plain old telephone service (POTS), or plain ordinary telephone service, is a retronym for voice-grade telephone service employing analog signal transmission over copper loops.
A traditional landline telephone system, also known as plain old telephone service (POTS), commonly carries both control and audio signals on the same twisted pair (C in diagram) of insulated wires, the telephone line.

Caller ID

caller IDcaller line identificationCLI
The services include voicemail, Caller ID, call waiting, speed dialing, conference calls (three-way calling), enhanced 911, and Centrex services.
The idea of CNID as a service for POTS subscribers originated from automatic number identification (ANI) as a part of toll free number service in the United States.

Enhanced 9-1-1

E911enhanced 9-1-1enhanced 911
The services include voicemail, Caller ID, call waiting, speed dialing, conference calls (three-way calling), enhanced 911, and Centrex services.
These circuits are similar to traditional telephone lines, but are formatted to pass the calling party's number (Automatic Number Identification, ANI).

Bandwidth (signal processing)

bandwidthbandwidthssignal bandwidth
Although POTS provides limited features, low bandwidth, and no mobile capabilities, it provides greater reliability than other telephony systems (mobile phone, VoIP, etc.).
For example, a 3 kHz band can carry a telephone conversation whether that band is at baseband (as in a POTS telephone line) or modulated to some higher frequency.

Centrex

centrex
The services include voicemail, Caller ID, call waiting, speed dialing, conference calls (three-way calling), enhanced 911, and Centrex services.
The redesigned equipment was so expensive that usually a separate 5XB switch was used just for Centrex customers, while POTS (Plain Old Telephone Service) customers were wired to an unmodified exchange.

Local loop

local loopsubscriber linesubscriber loop
The pair of wires from the central office switch to a subscriber's home is called a subscriber loop.

Voice over IP

VoIPvoice over IPvoice over Internet Protocol
POTS was the standard service offering from telephone companies from 1876 until 1988 in the United States when the Integrated Services Digital Network (ISDN) Basic Rate Interface (BRI) was introduced, followed by cellular telephone systems, and voice over IP (VoIP). Although POTS provides limited features, low bandwidth, and no mobile capabilities, it provides greater reliability than other telephony systems (mobile phone, VoIP, etc.).
This effectively means that people who have PCs can use them to make a VoIP call to any number, but if the remote side is a normal phone, the gateway that converts the VoIP call to a POTS call is not permitted by law to be inside India.

25-pair color code

25-pair color codeeven-count color codebinder
When used for POTS, the first wire is known as the tip or A-leg (U.K.) conductor and is usually connected to the positive side of a direct current (DC) circuit, while the second wire is known as the ring lead or B-leg (U.K.), and is connected to the negative side of the circuit.

Network interface device

network interface deviceinterfaceoptical network terminal
Plain old telephone service lines generally cannot be equipped with smartjacks.

Public switched telephone network

public switched telephone networkPSTNtelephone network
The term reflects the technology that has been available since the introduction of the public telephone system in the late 19th century, in a form mostly unchanged despite the introduction of Touch-Tone dialing, electronic telephone exchanges and fiber-optic communication into the public switched telephone network (PSTN).

Managed facilities-based voice network

wireline
They are the non-MFVN Internet VoIP, Plain Old Telephone Service MFVN (POTS), MFVN Cable, MFVN DSL, and MFVN Fiber.

Spark New Zealand

TelecomSparkTelecom New Zealand
Spark New Zealand (formerly Telecom New Zealand) is a New Zealand telecommunications company providing fixed line telephone services, a mobile network, an internet service provider, and a major ICT provider to NZ businesses (through its Spark Digital division).

Local access and transport area

LATAlocal access and transport areaLATA code
It represents a geographical area of the United States under the terms of the Modification of Final Judgment (MFJ) entered by the United States District Court for the District of Columbia in Civil Action number 82-0192 or any other geographic area designated as a LATA in the National Exchange Carrier Association, Inc. Tariff FCC No. 4. that precipitated the breakup of the original AT&T into the "Baby Bells" or created since that time for wireline regulation.

Prodigy (online service)

ProdigyProdigy serviceProdigy Communications Corporation
Initially, subscribers using personal computers accessed the Prodigy service by means of copper wire telephone "POTS" service or X.25 dialup.

GT-Power

GT Power is a bulletin board system (BBS) and dial-up telecommunications/terminal application for MS-DOS.

POTS codec

A POTS codec is a type of audio codec that uses digital signal processing to transmit audio digitally over standard telephone lines ("Plain Old Telephone Service") at a higher level of audio quality than the telephone line would normally provide in its analog mode.

Videotelephony

videoconferencingvideo conferencingvideo chat
At the dawn of its commercial deployment from the 1950s through the 1990s, videotelephony also included "image phones" which would exchange still images between units every few seconds over conventional POTS-type telephone lines, essentially the same as slow scan TV systems.

Wireless local loop

WLLwireless local loopWireless Local Loop (WLL)
Wireless local loop (WLL), is the use of a wireless communications link as the "last mile / first mile" connection for delivering plain old telephone service (POTS) or Internet access (marketed under the term "broadband") to telecommunications customers.

Digital subscriber line

DSLdigital subscriber linexDSL
DSL service can be delivered simultaneously with wired telephone service on the same telephone line since DSL uses higher frequency bands for data.

Media gateway

media gatewayMGWMedia Gateways
A media gateway is a translation device or service that converts media streams between disparate telecommunications technologies such as POTS, SS7, Next Generation Networks (2G, 2.5G and 3G radio access networks) or private branch exchange (PBX) systems.

Telecommunications engineering

telecommunications engineeringcommunications engineeringtelecommunications engineer
A telecommunication engineer is responsible for designing and overseeing the installation of telecommunications equipment and facilities, such as complex electronic switching systems, and other plain old telephone service facilities, optical fiber cabling, IP networks, and microwave transmission systems.

Radiotelephone

radiotelephoneradio telephoneradiotelephony
Radiotelephone systems are very rarely interconnected with the public "land line" (POTS/PSTN) telephone network, and in some radio services, including GMRS, such interconnection is prohibited.