Chapter 6. Cisco Catalyst Switches
Deploying IP telephony requires planning how the IP phones will be powered and how the voice network will be combined with the data network, while ensuring that voice calls maintain high quality.
Cisco Catalyst switches provide three primary features that aid an IP telephony deployment: Power over Ethernet (PoE), voice VLANs, and class of service (CoS). Power over Ethernet (PoE) can save on wiring costs and simplify cable infrastructure management. Multiple VLANs are normally enabled on a single Cisco switch access port, with the phone marking voice VLAN data and the switch port accepting data VLAN information untagged. Dual VLAN access ports simplify configuration when compared to configuring 802.1q trunk links ...
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