CCNP ONT Student Guide Version 1.0 vol.1-2 by Cisco PDF

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Официальный учебник для подготовки к экзамену Cisco 642-845 ONT (Optimizing Converged Cisco Networks) трека CCNP (Cisco qualified community specialist) в двух частях.

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Additional info for CCNP ONT Student Guide Version 1.0 vol.1-2

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C 部 om 资 料 – Mixed mode supports different codecs. – Single mode demands that the same codec to be used by all participants. • Mixed mode has fewer conferences per DSP. © 2006 Cisco Systems, Inc. All rights reserved. 0—2-21 A DSP used for mixed-mode conferences allows the conference participants to use different codecs. In this case, the DSP not only mixes streams with the same codec type but can mix streams of different codecs. It also provides transcoding functions. Because of that additional functionality, mixed-mode conferences are more DSP intensive, and fewer conferences per DSP can be supported than in single mode.

Packet telephony shares bandwidth among multiple logical connections. „ Lower transmission costs: A substantial amount of equipment is needed to combine 64-kbps channels into high-speed links for transport across the network. Packet telephony statistically multiplexes voice traffic alongside data traffic. This consolidation provides substantial savings on capital equipment and operations costs. „ Consolidated network expenses: Instead of operating separate networks for voice and data, voice networks are converted to use the packet-switched architecture to create a single integrated communications network with a common switching and transmission system.

All rights reserved. 0—2-15 Each sample is encoded in the following way: „ One polarity bit: Indicates positive versus negative signals „ Three segment bits: Identify the logarithmically sized segment number (0–7) „ Four step bits: Identify the linear step within a segment Because 8000 samples per second are taken for telephony, the bandwidth that is needed per call is 64 kbps. This is the reason why traditional, circuit-based telephony networks use timedivision-multiplexed lines, combining multiple channels of 64 kbps each (digital signal level 0 [DS-0]) in a single physical interface.

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CCNP ONT Student Guide Version 1.0 vol.1-2 by Cisco

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