User manual

Publication 1783-UM003D-EN-E - December 2009 33
Chapter 2
VLANs in a Stratix 8000 Switch Network
Isolate Different Traffic Types
Isolating data traffic from delay-sensitive traffic, such as voice traffic, ensures
the quality of the voice transmission. In the figure on page 33, VLANs in a
Stratix 8000 Switch Network, switch ports connected to the IP phones belong
to VLAN 3, a VLAN that is configured to provide Voice over IP (VoIP)
services on these connections, meaning priority is given to voice traffic over
regular IP data traffic. Voice traffic from the phone and IP-phone service
requests to an IP PBX server have priority over traffic from the desktop
devices attached to the IP phones.
To further isolate data traffic from voice traffic, the data traffic from the
attached desktop devices can be assigned to a separate VLAN.