Which of the following statement is incorrect?

• Multiplexers are designed to accept data from several I/O devices and transmit a unified stream of data on one communication line

• HDLC is a standard synchronous communication protocol

• RTS/CTS is the way the terminal indicates ringing

• RTS/CTS is the way the DTE indicates that it is ready to transmit data and the way the DCE indicates that it is ready to accept data

Terminals are required for?

• real-time, batch processing & time-sharing

• real-time, time sharing & message switching

• real time, time-sharing & distributed message processing

• real time, distributed processing & manager inquiry

Which data communication method is used to transmit the data over a serial communication link?

• full-duplex

• band

• half-duplex

• simplex

What is the minimum number of wires needed to send data over a serial communication link layer?

• 6

• 4

• 1

• 2

Which of the following types of channels moves data relatively slowly?

• narrow band channel

• voice band channel

• none of the above

• wide band channel

Most data communications involving telegraph lines use?

• dialed service

• wideband channel

• simplex lines

• narrowband channel

The synchronous modems are more costly than the asynchronous modems because?

• they contain clock recovery circuits

• they produce large volume of data

• they transmit the data with stop and start bits

• they operate with a larger bandwidth

Which of the following statement is correct?

• control section of a synchronous modem contains the scrambler

• terminal section of a synchronous modem contains the scrambler

• transmission section of a synchronous modem contains the scrambler

• receiver section of a synchronous modem contains the scrambler

A remote batch-processing operation in which data is solely input to a central computer would require?

• all of the above

• mixed band channel

• simplex lines

• telegraph line

The transmission signal coding method of T1 carrier is called?

• NRZ

• Bipolar

• Manchester

• Binary