QUESTION 13 The bit error rate (BER) of a communications link is influenced by:

Question

QUESTION 13 The bit error rate (BER) of a communications link is influenced by: a. transmission power b. modulation method c. noise d. all of the aove

QUESTION 14 CRC (cyclic redundancy check) is a stronger error detection method than simple parity checking. True False 10 points

QUESTION 15 ARQ (automatic repeat request) is considered a forward error correction (FEC) technique. True False

QUESTION 18 Time division multiplexing (TDM) and frequency division multiplexing (FDM) can be used in tandem together. True False

Explanation / Answer

QUESTION 13

The bit error rate (BER) of a communications link is influenced by noise.

The bit error rate (BER) is the number of bit errors per unit time.

QUESTION 14

CRC (cyclic redundancy check) is a stronger error detection method than simple parity checking. True

Simple Parity check
Blocks of data from the source are subjected to a check bit or parity bit generator form, where a parity of :

Cyclic redundancy check

QUESTION 15

ARQ (automatic repeat request) is considered a forward error correction (FEC) technique.: False

Forward error correction (FEC) is a technique used for controlling errors in data transmission over unreliable or noisy communication channels. The central idea is the sender encodes the message in a redundant way by using an error-correcting code (ECC).

Automatic Repeat reQuest (ARQ) is an error control method for data transmission that makes use of error-detection codes, acknowledgment and/or negative acknowledgment messages, and timeouts to achieve reliable data transmission.

QUESTION 18

Time division multiplexing (TDM) and frequency division multiplexing (FDM) can be used in tandem together.True

FDM divides the channel into two or more frequency ranges that do not overlap, while TDM divides and allocates certain time periods to each channel in an alternating manner.

FDM and TDM are often used in tandem, to create even more channels in a given frequency range. The common practice is to divide the channel with FDM, so that you have a dedicated channel with a smaller frequency range. Each of the FDM channels is then occupied by multiple channels that are multiplexed using TDM.

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.