Which of the following statement is incorrect?

• 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

• HDLC is a standard synchronous communication protocol

• RTS/CTS is the way the terminal indicates ringing

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

Terminals are required for?

• real time, time-sharing & distributed message processing

• real-time, time sharing & message switching

• real time, distributed processing & manager inquiry

• real-time, batch processing & time-sharing

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

• simplex

• half-duplex

• band

• full-duplex

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

• 2

• 6

• 1

• 4

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

• narrow band channel

• none of the above

• voice band channel

• wide band channel

Most data communications involving telegraph lines use?

• narrowband channel

• wideband channel

• simplex lines

• dialed service

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?

• receiver section of a synchronous modem contains the scrambler

• terminal section of a synchronous modem contains the scrambler

• control section of a synchronous modem contains the scrambler

• transmission 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

• simplex lines

• telegraph line

• mixed band channel

The transmission signal coding method of T1 carrier is called?

• Binary

• Manchester

• Bipolar

• NRZ