QoS
From Bandipedia
Quality of Service
The process implemented across a carrier’s backbone whereby specific packets are labeled with a priority tag. The packets of a higher rank will be handled first by a router receiving multiple transmissions. A comparable analogy is an ambulance in rush-hour traffic. Automobiles must line up and compete for forward movement. An ambulance has authority to pass every other car on the road because it is has a priority over them. QoS takes form at the user’s level on CPE as prioritization. A router can prioritize packets giving rank to specific applications it send to the network.
Networks should utilize QoS capabilities at every point on the network. Layer 3-based QoS features, such as TOS or Diff-Serv, should be implemented for prioritizing traffic through multiple subnets. This is particularly important at aggregation points or bottle necks within the network. QoS will ensure that the VoIP traffic gets the highest priority at congestion points and help to maintain low latency and jitter.
The new Cisco and Polycom IP phones enable "one-wire-to-the-cube" installations, supporting two-port mini-switches on the backs of the phones. The Ethernet connection from the LAN attaches to one of these switch ports. The other connects to the PC, putting the phone directly inline between the PC and the LAN. Both data and voice, then, can access the network over the same 100 Mbps pipe. The Cisco and Polycom both have traffic shaping features built into their switch ports. For this reason, phones that utilize Hub port in the back of the phone are less desirable as they cannot implement QoS required to prioritize the voice traffic over the data from the PC.
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