Voice VLAN

Old Phone:

  • In older technology desks usually had a PC connected to an Ethernet Switch. Video conferencing kit to a MCU & a Non-IP Phone connected to a Voice Switch called PBX (Private Branch Exchange).

  • Both PBX & Ethernet Switch sometimes used to sit in the same closet.

    New Phone:

  • The next generation architecture now provides (voice,video & data) Triple play service over a single infrastructure (wire).

  • Now in this updated technology desks have PC connected to an Ethernet Switch/Wifi & IP Phone like an end user computer is also connected to an Ethernet Switch/Wifi.

  • IP Phones sends & receive voice using IP Packets through their Ethernet ports & the CUCM ( Cisco Unified Communication Manager) software replaced the PBX management but tagged with an 802.1Q header.

  • One port of the IP Phone is connected to the PC & another to the Ethernet Switch placed in the wiring closet.

  • In an IP Phone, PC is in Data VLAN & IP Phone is in Voice VLAN & the Switch port with which it is connected to acts sort of like a Trunk port carrying traffic from 2 different VLANs.

Reference:

  • CCNA 200-301 OCG, Volume 1, Pg. 196-197 - Wendell Odom.

PreviousDTP (Dynamic Trunking Protocol)NextWhy STP?

Last updated