D-Link DGS-6600-48TS Configuration Guide - Page 174
Voice VLAN, Overview, An Introduction to Voice VLAN
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Volume 3-Layer 2 Configurations / Chapter 18-Voice VLAN Chapter Overview Chapter 18 Voice VLAN Chapter Overview The following topics are included in this chapter, please go to the topic for more detailed information: • Chapter Overview • An Introduction to Voice VLAN • Voice VLAN Notational information • Voice VLAN Process Voice Packets • Voice VLAN working with LLDP-MED • Voice VLAN Configuration commands • Configuration Examples • Voice VLAN Configuration Example An Introduction to Voice VLAN Compared to data traffic, voice traffic must be given a higher transmission priority, because the sound quality of an IP phone call will be deteriorated if the voice traffic is unevenly sent. The quality of service (QoS) for voice traffic shall be configured to ensure the transmission priority of voice packet is higher than normal traffic. Voice VLAN enables switch ports to carry voice traffic with a defined priority in order to enable the separation of voice and data traffic coming onto the port. A primary benefit of using Voice VLAN is to ensure that the sound quality of an IP phone is safeguarded from deteriorating when the data traffic on the port is high. The following figure illustrates an example of voice VLAN. Voice traffic is forwarded in voice VLAN and data traffic is forwarded in port-based VLAN (if no other kind of VLAN is applied). DGS-6600 Configuration Guide 174
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