0 — Test 397

Correct Answer: B. B. False
Explanation: RWA algorithm deals with the wavelength assignment, physical path and blocking probability. Network topology plays a crucial role in the wavelength assignment. The network state and topology enables the RWA algorithm to function smoothly.

Correct Answer: A. A. True
Explanation: The connections employs in static RWA are semi-permanent but remain active for a relatively longer period of time. The traffic patterns are known in advance and thus the optimization can be done by assigning network resources to each connection.

Correct Answer: C. C. Frequency & phase
Explanation: Being in phase lock means that the receiver’s local oscillator is synchronized in both frequency and phase with the received signal.

Correct Answer: C. C. Three
Explanation: Coherent modulation requires three levels of synchronization – phase symbol and frame.

Correct Answer: C. C. Phase & frequency synchronization
Explanation: Non coherent system requires frequency synchronization.

Correct Answer: C. C. Frame synchronization
Explanation: Frame synchronization is necessary when the information is organized in blocks or messages of some uniform number of symbols. Thus block code needs frame synchronization.

Correct Answer: D. D. All of the mentioned
Explanation: Non coherently detected BPSK is the simplest digital receiver and it requires frequency tracking, bit timing synchronizations and also phase synchronization.

Correct Answer: B. B. Two way communication
Explanation: Transmitter plays a role in synchronization by varying the frequency and timing of its transmissions to correspond to expectation of receiver. This transmitter synchronization implies two way communication.

Correct Answer: B. B. Increases
Explanation: For each level increase in synchronization levels, cost increases.

Correct Answer: C. C. Non coherent modulation techniques & many users accessing
Explanation: For communication system using non coherent modulation techniques and many users accessing the central communication node, synchronization is necessary.