March 2004
Intermediate to advanced
360 pages
8h 54m
English
Content preview from POWER UP YOUR SMALL-MEDIUM BUSINESS: A GUIDE TO ENABLING NETWORK TECHNOLOGIES
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Power Up Your Small-Medium Business
(192)
IPT systems must be able to guarantee low latency. This delay is usually
measured in milliseconds. Latency of less than 150 milliseconds (for
one-way traffic) and less than 250 milliseconds (for round-trip or two-
way traffic) is generally considered the absolute ceiling for high-quality
IP voice services. It is the same level of delay that users get with circuit-
switched voice services delivered via satellite.
• Jitter (or delay variation)—This occurs when voice packet arrival
times fluctuate. Jitter requires buffering voice traffic. Packets are held for
a period of time before they are forwarded to control ...
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