O'Reilly logo

Cisco LAN Switching Configuration Handbook, Second Edition by David Hucaby - CCIE No. 4594, David Jansen - CCIE No. 5952, Steve McQuerry - CCIE No. 6108

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Chapter 14Voice

See the following sections to configure and use these features:

14-1: Voice Ports: Covers the commands necessary to configure switched Ethernet ports for IP telephony

14-2: Voice QoS: Presents guidelines and configuration suggestions that provide end-to-end quality of service (QoS) in a campus network

14-1: Voice Ports

• Inline power is provided to a powered device as follows:

• A phantom-powered device can be detected as a switch port becomes active.

• A powered device loops the transmit and receives pairs back so that the switch detects its own 340 kHz test tone.

• Power is applied to the port if the device is present; no power is applied if a normal Ethernet device is connected.

• Inline power is provided over pairs 2 ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required