Plain old telephone service

POTSLocal Telephone Servicetelephonetelephone servicewirelineanalogPhone Serviceanalog telephoneland-line phonesLandline Telephone Service
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.wikipedia
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Integrated Services Digital Network

ISDN ISDNISDN30
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

phonetelephonesLocal Telephone Service
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 line identificationCaller-IDCalling Line Identification
The services include voicemail, Caller ID, call waiting, speed dialing, conference calls (three-way calling), enhanced 911, and Centrex services.
The concept of calling number identification as a service for POTS subscribers originated from automatic number identification (ANI) as a part of toll free number service in the United States.

Local loop

subscriber lineloopsubscriber 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 Internet Protocolvoice-over-IP
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.).
The terms Internet telephony, broadband telephony, and broadband phone service specifically refer to the provisioning of communications services (voice, fax, SMS, voice-messaging) over the public Internet, rather than via the public switched telephone network (PSTN), also known as plain old telephone service (POTS).

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.

Public switched telephone network

PSTNpublic telephone networktelephone 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).

Enhanced 9-1-1

Enhanced 911E911E-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).

25-pair color code

25-pair cable25-pair colour 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

optical network terminalinterfacenetwork interface
Plain old telephone service lines generally cannot be equipped with smartjacks.

Publicly Available Telephone Services

A plain old telephone service has high reliability and is unlikely to be affected by local power outages.

Twisted pair

unshielded twisted pairtwisted-pairshielded twisted pair

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.

Retronym

retroactively namedrenamedretroactive addition
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.

Mobile phone

cell phonemobile phonesmobile
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.).

Telephone network

Network engineeringtelephonefixed and mobile networks
POTS remains the basic form of residential and small business service connection to the telephone network in many parts of the world.

Telephone exchange

exchangescentral officeexchange
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).

Fiber-optic communication

fiber-opticfiber optic communicationsfiber-optic 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).

Tip and ring

pair of wiresR and Ttip
The pair of wires from the central office switch to a subscriber's home is called a subscriber loop.

Volt

VkVvolts
It carries a direct current (DC) voltage at a nominal voltage of -48V when the receiver is on-hook, supplied by a power conversion system in the central office.

Ohm

Ωohmsmegohm
The maximum resistance of the loop is 1,700ohms, which translates into a maximum loop length of 18,000 feet or 5 km using standard 24-gauge wire.

American wire gauge

AWGgaugeAmerican Wire Gauge (AWG)
The maximum resistance of the loop is 1,700ohms, which translates into a maximum loop length of 18,000 feet or 5 km using standard 24-gauge wire.

Vertical service code

calling featureservice featureCustom Local Area Signaling Services
Many calling features became available to telephone subscribers after computerization of telephone exchanges during the 1980s in the United States.

Voicemail

voice mailvoice-mailvoice messaging
The services include voicemail, Caller ID, call waiting, speed dialing, conference calls (three-way calling), enhanced 911, and Centrex services.

Call waiting

call-waiting
The services include voicemail, Caller ID, call waiting, speed dialing, conference calls (three-way calling), enhanced 911, and Centrex services.