Which of the following statement is incorrect?

• 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

• 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 & distributed message processing

• real-time, time sharing & message switching

• real time, distributed processing & manager inquiry

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

• simplex

• band

• half-duplex

• full-duplex

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

• 2

• 1

• 4

• 6

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

• fiber optic channel

• narrow band channel

• voice band channel

• wide band channel

Most data communications involving telegraph lines use?

• simplex lines

• narrowband channel

• wideband channel

• dialed service

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

• they operate with a larger bandwidth

• they transmit the data with stop and start bits

• they produce large volume of data

• they contain clock recovery circuits

Which of the following statement is correct?

• terminal section of a synchronous modem contains the scrambler

• transmission section of a synchronous modem contains the scrambler

• control 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?

• Bipolar

• NRZ

• Manchester

• Binary