CCNA Portable Command Guide (2nd Edition) by Scott Empson

By Scott Empson

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Additional info for CCNA Portable Command Guide (2nd Edition)

Sample text

The bandwidth that VoIP streams consume (in bits per second) is calculated by adding the VoIP sample payload (in bytes) to the 40-byte IP, UDP, and RTP headers (assuming that cRTP is not in use), multiplying this value by 8 (to convert it to bits), and then multiplying again by the packetization rate (default of 50 packets per second). 729) at a default packetization rate of 50 packets per second (pps) and at a custom packetization rate of 33 pps. This does not include Layer 2 overhead and does not take into account any possible compression schemes, such as Compressed RealTime Transport Protocol (cRTP, discussed in detail in Chapter 7, "Link-Specific Tools").

Thus, Cisco recommends designing to the ITU standard of 150 ms. If constraints exist and this delay target cannot be met, the delay boundary can be extended to 200 ms without significant impact on voice quality. Note Certain organizations might view higher delays as acceptable, but the corresponding reduction in VoIP quality must be taken into account when making such design decisions. Jitter Jitter buffers (also known as playout buffers) are used to change asynchronous packet arrivals into a synchronous stream by turning variable network delays into constant delays at the destination end systems.

If I Have AutoQoS, Why Should I Be Reading This Book? It is important to keep in mind not only the evolution of QoS, but also, more specifically, that of AutoQoS. In the late 1990s, critical QoS features for enabling the convergence of voice and data networks, such as low-latency queuing (LLQ), Link Fragmentation and Interleaving (LFI), Catalyst queuing, and trust were developed and released within Cisco IOS and within Catalyst hardware/software. Despite the recognition that these features could enable network convergence, many customers were slow to adopt and deploy these technologies.

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