Simplex communication

simplexunidirectionalCDS-link receiverone-to-manysimplex protocolunidirectional buses
Simplex communication is a communication channel that sends information in one direction only.wikipedia
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Duplex (telecommunications)

half-duplexfull-duplexduplex
A duplex communication channel requires two simplex channels operating in opposite directions. The old Western Union company used the term simplex when describing the half-duplex and simplex capacity of their new transatlantic telegraph cable completed between Newfoundland and the Azores in 1928.
Systems that do not need the duplex capability may instead use simplex communication, in which one device transmits and the others can only "listen".

Communication channel

channelchannelscommunications channel
Simplex communication is a communication channel that sends information in one direction only.
Simplex communication, duplex communication or half duplex communication channel

International Telecommunication Union

ITUInternational Telecommunication Union´sInternational Telecommunications Union
The International Telecommunication Union definition is a communications channel that operates in one direction at a time, but that may be reversible; this is termed half duplex in other contexts.

Broadcasting

broadcastbroadcasterbroadcasters
For example, in TV and radio broadcasting, information flows only from the transmitter site to multiple receivers.

Walkie-talkie

walkie talkiewalkie-talkiesradio
A pair of walkie-talkie two-way radios provide a simplex circuit in the ITU sense; only one party at a time can talk, while the other listens until it can hear an opportunity to transmit.

Two-way radio

two way radioRadio Operator2-way radio
A pair of walkie-talkie two-way radios provide a simplex circuit in the ITU sense; only one party at a time can talk, while the other listens until it can hear an opportunity to transmit.

Western Union

Western Union Telegraph CompanyWestern Union TelegraphWestern Union Company
The old Western Union company used the term simplex when describing the half-duplex and simplex capacity of their new transatlantic telegraph cable completed between Newfoundland and the Azores in 1928.

Transatlantic telegraph cable

transatlantic cableAtlantic cabletransatlantic cables
The old Western Union company used the term simplex when describing the half-duplex and simplex capacity of their new transatlantic telegraph cable completed between Newfoundland and the Azores in 1928.

Newfoundland (island)

Newfoundlandisland of NewfoundlandNewfoundland Island
The old Western Union company used the term simplex when describing the half-duplex and simplex capacity of their new transatlantic telegraph cable completed between Newfoundland and the Azores in 1928.

Azores

Azoreanthe AzoresAzores Islands
The old Western Union company used the term simplex when describing the half-duplex and simplex capacity of their new transatlantic telegraph cable completed between Newfoundland and the Azores in 1928.

National Fire Protection Association

NFPANational Fire Protection Association (NFPA)National Fire Protection Agency
The same definition for a simplex radio channel was used by the National Fire Protection Association in 2002.

Radio network

networkradioradio networks
There are two types of radio networks currently in use around the world: the one-to-many broadcast network commonly used for public information and mass media entertainment; and the two-way radio type used more commonly for public safety and public services such as police, fire, taxicabs, and delivery services.

SITOR

FECNDBPSITOR collective B-mode
SITOR (SImplex Teletype Over Radio) is a system for transmitting text messages.

MIDI 1.0

first MIDI specificationMIDIMIDI specification
It consists physically of a one-way (simplex) digital current loop electrical connection sending asynchronous serial communication data at 31,250 bits per second.

Anonymous pipe

pipe (anonymous) pipe
In computer science, an anonymous pipe is a simplex FIFO communication channel that may be used for one-way interprocess communication (IPC).

List of interface bit rates

list of device bandwidthsBandwidthList of computer peripheral bus bit rates
The figures below are simplex data rates, which may conflict with the duplex rates vendors sometimes use in promotional materials.

Microarchitecture

architectureµarchcomputer organization
Typically, the diagram connects those elements with arrows, thick lines and thin lines to distinguish between three-state buses (which require a three-state buffer for each device that drives the bus), unidirectional buses (always driven by a single source, such as the way the address bus on simpler computers is always driven by the memory address register), and individual control lines.

Cable modem

cablecable modemscable internet
This architecture takes advantage of the well developed unidirectional CATV components.

Serial Peripheral Interface

SPImicrowireSPI bus
SSI Protocol employs differential signaling and provides only a single simplex communication channel.

Broadcast encryption

The typical setting considered is that of a unidirectional broadcaster and stateless users (i.e., users do not keep bookmarking of previous messages by the broadcaster), which is especially challenging.

Storm spotting

storm spotterstorm spottersspotter
Prior to the 1960s, the vast majority of amateur radio communication relied on AM-modulated signals and the use of simplex.

Synchronous Serial Interface

SSI
It is different from the Serial Peripheral Interface Bus (SPI): A SSI is differential, simplex, non-multiplexed, and relies on a time-out to frame the data.

I²C

I 2 CI2CI 2 C bus
In 2012, Version 4 added 5 Mbit/s Ultra Fast-mode (UFm) for new USDA (data) and USCL (clock) lines using push-pull logic without pull-up resistors, and added an assigned manufacturer ID table. It is only a unidirectional bus.

Network Control Program

NCPInitial Connection Protocol
NCP was a simplex protocol that utilized two port addresses, establishing two connections, for two-way communications.