An IT network which interconnects local area network over a broad geographical area.

A device that is used to permit an equipment with non-ISDN interface to be connected to the digital network.

It is used to connect computers in the same building or same area.

Type of transmission in which each information is individually synchronized, this is normally done through the use of start and stop elements.

A device that connects two dissimilar networks and performs the protocol conversion.

An equipment in data communications which is referred to as a source of information to be transmitted at one end and the sink which receives the information at the other end.

For a sample rate of 40kHz, determine the maximum analog input frequency.

He showed mathematically that it is possible to reconstruct a bandlimited analog signal from periodic samples as long as the sampling rate is at least twice the frequency of the highest frequency component of the signal.

The process of exchanging pre-determined codes and signals in telecommunications between two data terminals to establish a connection

These are the rules in data communications intended for establishing data links and message interpretation.

A digital carrier facility used to transmit a DS1 formatted signal at 1.544 Mbps.

It is the total useful information processed or communicated over specified amount of time.

All bits in a character are sent and received ______ in a serial port.

Refers to one of the most commonly used internet service domains.

10BaseT network supports ______ as transmission medium.

The conversion of digital signals into analog for purposes of transmitting into telephone line is done through

Which of the following is not referred to as DTE?

Device that comply with the ISDN network interface and can be connected directly to the digital network.

Ethernet is a baseband system using CSMA/CD operating at

Information capacity is proportional to

A telephone line has a bandwidth of 3.2kHz and S/N of 35 dB. A signal is transmitted down a line using 4-level code. What is the maximum theoretical data rate?

Sixteen different levels are used to encode binary data. The channel bandwidth is 36 MHz. The maximum channel capacity is

In _____ the frequency of the carrier signal is varied based on the information in a digital signal.

_____ rate is always less than or equal to the _____ rate,

This ITU-T recommendation generally describes transmission over phone lines

_____ refers to a way a network is laid out, either physically or logically.

What is the controlling node of a star topology system?

In a _____ topology, drop lines and taps are used to connect devices to a backbone.

The most frequently used UTP connector.

The RG number gives us information about

What is an early communication system that uses continuous wave modulation?

The character code that uses a 5 bit word code

The hardware circuit used to generate the state of parity bit is composed of a number of _____ gates.

How many Hamming bits would have to be added to a data block containing 128 bits?

Which standards organization developed the OSI model?

The OSI model consists of _____ layers.

What is the ITU specification for the RS232C?

This is the ordinary telephone twisted pair, one of several media specified in the IEEE802.3 standard for Ethernet LAN's.

This is a device that can be used to connect one Ethernet network to another nearby Ethernet network.

In _____ TDM, the multiplexer allocates exactly the same time slots to each device at all times.

In ISDN, the ____ channel is used for applications requiring a transmission rate greater than 64 kbps.

The BRI data rate

A microwave system uses 256 QAM. If it has a channel with a 40 MHz bandwidth, what is its maximum data rate, ignoring noise?

A modulator transmits symbols, each of which has 64 different possible states, 10000 times per second. Calculate the bit rate.

A 32 QAM modulated signal has a baud rate of 2000, the bit rate is _____ bps.

Which LAN has the highest data rate?

_____ uses a physical star topology.

10Base2 uses _____ cable while 10Base5 uses _____ cable.

Find the minimum bandwidth for an FDM multiplexer with 5 lines, each requiring 4000 Hz and a 200 Hz guard separating each band.

The ________ is the physical path over which a message travels

The information to be communicated in a data system is the ________.

Frequency of failure and network recovery time after a failure are measures of the ________ of a network.

An unauthorized user is a network ________ issue.

Which topology requires a central controller or hub?

Which topology requires a multipoint connection?

Communication between a computer and a keyboard involves ________________ transmission.

In a __________ connection, more than two devices can share a single link.

59. In __________ transmission, the channel capacity is shared by both communicating devices at all times.

A cable break in a ________ topology stops all transmission.

Which organization has authority over interstate and international commerce in the communications field?

The process-to-process delivery of the entire message is the responsibility of the __________ layer.

The __________ layer is the layer closest to the transmission medium.

Mail services are available to network users through the __________ layer.

Unipolar, bipolar and polar encoding are types of ________ encoding

If a symbol is composed of 3 bits, there are __________ data levels.

PCM is an example of ________ conversion.

If the frequency spectrum of a signal has bandwidth of 500 Hz with the highest frequency at 600 Hz, what should be the sampling rate, according to the Nyquist theorem?

ASK, PSK, FSK nad QAM are examples of ________ modulation.

In QAM, both phase and ________ of a carrier frequency are varied.

The sharing of a medium and its link by two more devices is called ________.

Which multiplexing technique transmits digital signals?

Which multiplexing technique shifts each signal to a different carrier frequency?

______ has a higher transmission rate in the downstream direction than in the upstream direction.

______ is suitable for businesses that require comparable upstream and downstream data rates.

The largest portion of the bandwidth for ADSL carries _____

______ is a device at the telephone company site that can packetize data to be sent to the ISP Server.

______ was designed as an alternative to the T-1 line.

SONET is an acronym for ______ Network.

In a SONET system, ______ can remove signals from a path.

The synchronous payload envelope of an STS-1 frame contains ______.

The Nyquist theorem specifies the minimum sampling rate to be ______.

One factor in the accuracy of a reconstructed PCM signal is the __________.

Which encoding type always has nonzero average amplitude

Which of the following encoding methods does not provide for synchronization?

Which encoding method uses alternating positive and negative values for 1s?

If the maximum value of a PCM signal is 31 and the minimum value is -31, how many bits were used for encoding?

RZ encoding involves ________ signal levels.

Which quantization level results in a more faithful reproduction of the signal?

Which encoding technique attempts to solve the loss of synchronization due to long strings of 0s?

Block coding can help in ________ at the receiver.

In __________ transmission, bits are transmitted simultaneously, each across its own wire.

In ________ transmission, bits are transmitted over a single wire, one at a time.

94. In ________ transmission, a start bit and stop bit frame a character byte.

If the bit rate for a QAM signal is 3000 bps and a signal unit is represented by a tribit, what is the baud rate?

If the baud rate for a QAM signal is 3000 and a signal unit is represented by a tribit, what is the bit rate?

If the baud rate for a QAM signal is 1800 and the bit rate is 9000, how many bits are there per signal unit?

In 16-QAM, there are 16 __________.

Which modulation technique involves tribits, eight different phase shifts, and one amplitude?

Given an AM radio signal with a bandwidth of 10 KHz and the highest-frequency component at 705 KHz, what is the frequency of the carrier signal?