Lineman's handset

test set
A lineman's handset is a special type of telephone used by technicians for installing and testing local loop telephone lines.wikipedia
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Telephone

phonetelephonesLocal Telephone Service
A lineman's handset is a special type of telephone used by technicians for installing and testing local loop telephone lines.
A lineman's handset is a telephone designed for testing the telephone network, and may be attached directly to aerial lines and other infrastructure components.

Point of appearance

line appearancetermination
A butt set can be connected wherever there is a line appearance—anywhere the wires are accessible.
Others are physical, like a punch down COSMIC frame where a technician can place a test set, or a heat coil socket.

Beige box (phreaking)

beige boxbeige boxing
* Beige box (phreaking)
In phone phreaking, a beige box is a device that is technically equivalent to a telephone company lineman's handset — a telephone fitted with alligator clips to attach it to a line.

Lineworker

linemanlinemenlinesman
A lineman's handset is a special type of telephone used by technicians for installing and testing local loop telephone lines.

Local loop

subscriber lineloopsubscriber loop
A lineman's handset is a special type of telephone used by technicians for installing and testing local loop telephone lines.

Telephone line

phone linelinetelephone lines
A lineman's handset is a special type of telephone used by technicians for installing and testing local loop telephone lines.

Rotary dial

dialrotary telephonerotary phone
A typical lineman's handset integrates an earpiece, a mouthpiece, a dialing interface, and a set of test leads for connecting to the telephone circuit. Originally, lineman's handsets featured a rotary dial, but modern sets use some variant of the standard 12-button DTMF keypad and also employ an amplifier for speaker use.

Telephone keypad

keypad12-key telephone keypaddial pad
Originally, lineman's handsets featured a rotary dial, but modern sets use some variant of the standard 12-button DTMF keypad and also employ an amplifier for speaker use.

Plain old telephone service

POTSLocal Telephone Servicetelephone
Most handsets are designed to be used with analog "POTS" lines, and have limited or no function with digital circuits.

Digital electronics

digital circuitdigitaldigital technology
Most handsets are designed to be used with analog "POTS" lines, and have limited or no function with digital circuits.

Switch

switchestoggle switchelectrical switch
A talk/monitor toggle switch

Hook flash

flashesRecallswitchhook flash
Hook flash button

Dual-tone multi-frequency signaling

DTMFtouch-tonetouch tone
Originally, lineman's handsets featured a rotary dial, but modern sets use some variant of the standard 12-button DTMF keypad and also employ an amplifier for speaker use. Tone/pulse dialing selection switch

Pulse dialing

dial pulsepulse diallingpulse dial
Tone/pulse dialing selection switch

Low-pass filter

low-passlow pass filterlow pass
Low-pass filtering to prevent disruption of data communications (such as DSL)

Digital subscriber line

DSLxDSLDigital Subscriber Line (DSL)
Low-pass filtering to prevent disruption of data communications (such as DSL)

Belt (clothing)

beltbeltsleather belt
A mechanical hook for hanging the set from a tool belt. On some sets, it may be moved to the receiver side, mouthpiece side, or removed altogether.

Modular connector

8P8C8P8C modular connector4P4C
A lineman's handset typically connects via a pair of test leads, not the modular connector found on most consumer telephone equipment.

Crocodile clip

alligator clipalligator clipsalligator" clip electrodes
The test leads will feature some combination of alligator clips (to connect to bare wires), a piercing spike or "bed-of-nails" (for insulated wires), and something designed to fit a punch block.

Punch-down block

punch blockpunch down blockpunch down
The test leads will feature some combination of alligator clips (to connect to bare wires), a piercing spike or "bed-of-nails" (for insulated wires), and something designed to fit a punch block.

Adapter

adaptoradapterstravel adapter
Adapters designed to fit other punch block types, heat coil sockets, or modular jacks may also be used.

Heat coil

Adapters designed to fit other punch block types, heat coil sockets, or modular jacks may also be used.

Telephone exchange

exchangescentral officeexchange
Inside the central office, this would be at a main or intermediate distribution frame.

Main distribution frame

MDFmainMDFs
Inside the central office, this would be at a main or intermediate distribution frame.