Voice transmission

This chapter summarize the operation of Ethernet as defined for 100/1000 Mbps LANs in the IEEE 802.3 standard. Explain the functions that enable a switch to forward Ethernet frames in a LAN. Configure a switch for operation in a network designed to support voice, video, and data transmissions. Configure basic security on a switch that will operate in a network designed to support voice, video, and data transmissions.

163p youcanletgo_01 04-01-2016 59 5   Download

This chapter summarize the operation of Ethernet as defined for 100/1000 Mbps LANs in the IEEE 802.3 standard; explain the functions that enable a switch to forward Ethernet frames in a LAN; configure a switch for operation in a network designed to support voice, video, and data transmissions.

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Amplitude distortion: Voice channel occupies the band from 300 to 3400 Hz. Some frequencies are attenuated more than others. Phase distortion Velocity of propagation varies with frequency. Filter: increase toward band center and decrease toward band edge.

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Telephone networks use circuit switching. The telephone network had its beginnings in the late 1800s. The entire network, which is referred to as the plain old telephone system (POTS), was originally an analog system using analog signals to transmit voice.

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Frame Relay is a standardized wide area network technology that specifies the physical and logical link layers of digital telecommunications channels using a packet switching methodology. Originally designed for transport across Integrated Services Digital Network (ISDN) infrastructure, it may be used today in the context of many other network interfaces. Network providers commonly implement Frame Relay for voice (VoFR) and data as an encapsulation technique, used between local area networks (LANs) over a wide area network (WAN).

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Summarize the operation of Ethernet as defined for 100/1000 Mbps LANs in the IEEE 802.3 standard. Explain the functions that enable a switch to forward Ethernet frames in a LAN. Configure a switch for operation in a network designed to support voice, video, and data transmissions. Configure basic security on a switch that will operate in a network designed to support voice, video, and data transmissions.

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Objectives: Summarize the operation of Ethernet as defined for 100/1000 Mbps LANs in the IEEE 802.3 standard. Explain the functions that enable a switch to forward Ethernet frames in a LAN. Configure a switch for operation in a network designed to support voice, video, and data transmissions. Configure basic security on a switch that will operate in a network designed to support voice, video, and data transmissions.

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Network Timing Digital trunks between two connecting nodes require clock synchronization in order to ensure proper framing of the voice channels. The sending switch clocks the bits in each frame onto the transmission facility.

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Khái niệm . Tích hợp điện thoại số và dịch vụ truyền dữ liệu . số hóa mạng điện thoại để cho phép truyền voice, data, text, graphics, music, video … qua mạng điện thoại sẵn có . Cung cấp dịch vụ ISDN tốc độ cao: image, file transmission, video conferencing …

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SIGNAL PROCESSING IN THE TELEPHONE SYSTEM Until the introduction of the digital telephone, there was virtually no signal processing on the subscriber loop. Indeed, there was no need for it. The majority of subscriber loops were able to transmit voice signals with no particular difficulty and in cases where the lines were longer than usual, line ‘‘loading’’ was used with success. Signal processing has two major aims: (1) To improve the quality of signal transmission over the telephone communication channels....

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Practical Network Transmission Planning Transmissionmedia exist to convey information across networks. No matter what form the information takes (be voice, video,data, or some other form), the prime requirement that the it is information received atthedestinationshouldas closelyaspossiblematch that originally transmitted. The signal should be free from noise, echo, interference and distortion, and should be of sufficient strength (or volume) asto be clearly distinguishable by the receiver. The reliability of the service is also important. ...

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GSM (Global System for Mobile Communications, originally Groupe Spécial Mobile), is a standard set developed by the European Telecommunications Standards Institute (ETSI) to describe technologies for second generation (2G) digital cellular networks. Developed as a replacement for first generation (1G) analog cellular networks, the GSM standard originally described a digital, circuit switched network optimized for full duplex voice telephony.

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First-generation (1G) wireless networks were established in the late 1970s with the primary aim of providing voice telephony services to mobile subscribers. 1G systems are basically characterized by the use of analog frequency modulation (FM) for voice transmission and frequency division multiple access (FDMA) as its multiple access architecture.

30p thachsaudoi 23-12-2009 96 13   Download