LAN Switching and Wireless

491. n _________ signal is the optical modulation of an STS-n (or STM-n) signal.

1. OC-n
2. TDM-n
3. FDM-n
4. none of the above

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492. ONET has defined a hierarchy of signals called _________.

1. STSs
2. STMs
3. either (a) or (b)
4. neither (a) nor (b)

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493. ONET is a _________ TDM system.

1. asynchronous
2. synchronous
3. statistical
4. none of the above

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494. ONET sends _________ frames per second

1. 1000
2. 2000
3. 4000
4. 8000

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495. Packet-switched networks can also be divided into _________ subcategories: virtual-circuit networks and datagram networks

1. four
2. three
3. two
4. five

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496. PCM is an example of _________ conversion.

1. digital-to-digital
2. digital-to-analog
3. analog-to-analog
4. analog-to-digital

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497. Quadrature amplitude modulation (QAM) is a combination of _________.

1. ASK and FSK
2. ASK and PSK
3. PSK and FSK
4. none of the above

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498. Radio waves are _________.

1. omnidirectional
2. unidirectional
3. bidirectional
4. none of the above

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499. Signals can be _________.

1. analog
2. digital
3. either (a) or (b)
4. neither (a) nor (b)

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500. Signals with a frequency above 30 MHz use _________propagation.

1. ground
2. sky
3. line-of-sight
4. none of the above

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