QoS Considerations

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Elements of QoS:

• Packet loss: Packet drops when congestion occurs

- Fixed: Codec, serialization, processing, WAN propagation

- Variable (Jitter): Queuing, SP WAN, dejitter buffer, traffic shaping

• Bandwidth: Contention induces delay (traffic shaping, queuing)

Elements of QoS:

• Packet loss: Packet drops when congestion occurs

- Fixed: Codec, serialization, processing, WAN propagation

- Variable (Jitter): Queuing, SP WAN, dejitter buffer, traffic shaping

• Bandwidth: Contention induces delay (traffic shaping, queuing)

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There are several areas to be considered when evaluating your QoS.

■ Campus: On campus there is typically a large bandwidth available, thus minimizing QoS issues on campus.

■ WAN edge: Often results in slow access links. If less than 2M, QoS techniques are a must to attain acceptable voice quality.

■ WAN considerations: This area is often forgotten or misunderstood. Speed mismatches; oversubscription; and lack of control over a SP network can have impacts on QoS.

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