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Simplex, Half-Duplex, and Full-Duplex Traffic



Words and word combinations:

Manner of data transmission – способ передачи данных

the direction of data traffic flow – направление потока движения данных

supported by communications links – поддержанная передающей релейной линией

simplex mode – простой способ

environmental devices – прибор контроля окружающей среды

information about temperature, humidity – информация о температуре и влажности

а half-duplex – наполовину двухсторонний

support two-way traffic – поддерживать двухстороннее движение

a walkie-talkie – переносная рация

the transmit button – передающая кнопка

a central computer system – сервер

in both directions simultaneously – в обоих направлениях одновременно

side-by-side tracks – направляющее устройство бок о бок

high-speed communication – высокоскоростная связь

full-duplex – полностью двухсторонний

 

Besides signals type (analog or digital) and manner of data transmission (synchronous or asynchronous), data communications technology must also consider the direction of data traffic flow supported by communications links such as modems. In the simplex mode, data can travel in only one direction at all times. For example, in some museum settings, environmental devices send information about temperature, humidity, and other conditions to a computer that monitors and adjusts office environmental settings automatically. However, the computer does not send information back to the devices. This simplex mode is also used occasionally in some local area networks.

 

 

Receiving Station

Simplex (one direction)

 

A half-duplex communications link can support two-way traffic, but data can travel in only one direction at one time. This mode of transmission is similar to using a walkie-talkie. When you press the transmit button you can talk, but you cannot receive. After you release the transmit button, you can receive, but you cannot transmit.

 

Sending and

receiving station

Half-duplex

(in both directions-but not at the same time)

 

Transmission of data in this mode over long distances can greatly increase the time it takes to communicate data. This delay is due to three factors: (1) the mode, (2) the time required for a device A to transmit a message to device B requesting confirmation that all is ready for transmission, and (3) the time required for device A to receive the confirmation that device B is ready to receive. The half-duplex transmission mode is most commonly used between a central computer system and the terminals connected to it.

 

 

Sending and

receiving station

Full-duplex

(in both directions simultaneously)

Full-duplex transmission sends data in both directions simultaneously, similar to two trains passing each other in different directions on side-by-side tracks. This transmission mode eliminates the problem of transmission delay, but it is more expensive than the other two modes. However, when high-speed communication between computers and peripherals is necessary, the expense may be worthwhile.

 

Exercises:

1. Give Russian equivalents of the following phrases:

Signals type (analog or digital); manner of data transmission; data communications technology; data can travel in only one direction; the computer does not send information; eliminates the problem of transmission delay.

 

2. Say if the following sentences are true or false.

1. The computer sends information back to the devices. 2. This simplex mode isn’t6 also used occasionally in some local area networks. 3. This mode of transmission is similar to using a walkie-talkie. 4. After you release the transmit button, you can receive, but you cannot transmit. 5. The half-duplex transmission mode isn’t most commonly used between a central computer system and the terminals connected to it.

 

3. Insert missing words, use the text’s vocabulary:

1. In the …, data can travel in only one direction at all times. 2. A … communications link can support two-way traffic, but data can travel in only one direction at one time. 3. When you … the transmit button you can talk, but you cannot receive. 4. Transmission of data in this … over long distances can greatly increase the time it takes to communicate data. 5. However, when … communication between computers and peripherals is necessary, the expense may be worthwhile.

4. Translate these sentences into your native language:

1. Besides signals type (analog or digital) and manner of data transmission (synchronous or asynchronous), data communications technology must also consider the direction of data traffic flow supported by communications links such as modems. 2. This simplex mode is also used occasionally in some local area networks. 3. The half-duplex transmission mode is most commonly used between a central computer system and the terminals connected to it. 4. This transmission mode eliminates the problem of transmission delay, but it is more expensive than the other two modes. 5.Full-duplex transmission sends data in both directions simultaneously, similar to two trains passing each other in different directions on side-by-side tracks.

 

Retell the text.

Text 13







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