VOICE and DATA Characteristic

sattar

Hello guys,

Above are the characteristic of voice and data
What i don't understand from the voice is:

• Smooth
  
• Benign
  
• UDP priority

and from the data is:

• Smooth/Brusty
  
• Benign/Greedy
• TCP Retransmits

Can somebody explain these characteristics to me?

Thanks in advanced

azaghul

For Voice:

• Smooth: if not using VAD (voice activity detection/silence suppression) voice traffic sends at a constant rate for the duration of the call, for each call. For G.711 this is 80Kb/s and for G.729 is 24Kb/s (excluding L2 overhead)
• Benign: depending on the bandwidth of the link, a single voice call does not eat into this much. A typical 100Mb/s LAN gets reduced by 87Kb/s, a 768Kb/s frame relay WAN gets reduced by 27Kb/s.
• UDP: if the packet is lost, no transmit required.

For Data:

• Smooth/Brusty: unpredictable in nature depending on what you are doing. Just look at how much a bittorrent download bandwidth varies over the life of the download, 34Kb/s one minute, 792Kb/s the next minute.
• Benign/Greedy: again, unpredictable in nature depending on what you are doing. Just look at how much a bittorrent download bandwidth varies over the life of the download, 34Kb/s one minute, 792Kb/s the next minute. Compare this to simple web browsing.
• TCP Retransmits: if the packet is lost, lets send it again.

Hope this helps.

sattar

Thank you Azaghul