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What is difference between baseband and broadband transmission?

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Asked By: Anonymous |

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In a baseband transmission, the entire bandwidth of the cable is consumed by a single signal. In broadband transmission, signals are sent on multiple frequencies, allowing multiple signals to be sent simultaneously.

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Baseband Signalling:

1)Uses digital signalling

2)No frequency-division multiplexing

3)Bi-directional transmission

4)Signal travels over short distances

Broadband Signalling:

1)Uses analog signalling

2)Unidirectional transmission

3)Frequency-division multiplexing is possible

4)Signal can travel over long distances before being attenuated

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Monday, April 28, 2008

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networking

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Network Administrator

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188

What is Modulation?

Electronic Communications Engineer

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Asked By: kiwitaryo |

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Modulation is the method by which a high-frequency digital signal is grafted onto a lower-frequency analog wave, so that digital packets are able to ride piggyback on the analog airwave.

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Monday, May 12, 2008

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J2ME

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What is FDMA?

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Asked By: kiwitaryo |

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Frequency-division multiple-access (FDMA) is a mechanism for sharing a radio frequency band among multiple users by dividing it into a number of smaller bands.

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Monday, May 12, 2008

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J2ME

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302

What is the frequency range used for Bluetooth in Japan?

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Asked By: thunderd |

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2472 to 2497 MHz is the frequency range used for Bluetooth in Japan.

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Sunday, May 11, 2008

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Which Bluetooth version uses adaptive frequency hopping? Why?

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Asked By: thunderd |

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In Version 1.2 Adaptive frequency hopping method is used, which improves resistance to radio interference, and provides higher transmission speed.

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Sunday, May 11, 2008

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How does Bluetooth use frequency hopping for security?

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Asked By: thunderd |

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Bluetooth picks a random frequency out of 79 and then hops around the range about 1600 times per second.

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Sunday, May 11, 2008

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List some Technology characteristic of Bluetooth?

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Asked By: thunderd |

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Omni directional, Adaptive output power to minimize interference, Support Synchronous & asynchronous services, Fast Frequency Hopping to avoid interference, Short data packets to maximize capacity during interface.

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Sunday, May 11, 2008

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What is the frequency range used for Bluetooth in Europe and United States?

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Asked By: thunderd |

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2402 MHz to 2480 MHz are the frequency ranges used in USA and Europe.

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Sunday, May 11, 2008

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196

What is Airport?

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Asked By: thunderd |

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Airport is a wireless communications system, like Bluetooth. It is based on the IEEE 802.11 recommendation. It also uses 2.4 GHz frequency band, but its range is about 45 meters and it boasts a transmission speed of 11 Mbit/second. It is developed by Lucent Technologies.

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Sunday, May 11, 2008

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