Calculating Delay Budget
The G.114 recommendation is for one-way delay only and does not account for roundtrip
delay. Network design engineers must consider both variable and fixed delays.
Variable delays include queuing and network delays, and fixed delays include coding,
packetization, serialization, and dejitter buffer delays. Table 2-2 offers a sample delay
budget calculation.
Table 2-2 Delay Budget Calculations
Delay Type Fixed (ms) Variable (ms)
Coder delay 18
Packetization delay 30
Queuing and buffering 8
Serialization (64 kbps) 5
continues
Table 2-2 Delay Budget Calculations (continued)
Delay Type Fixed (ms) Variable (ms)
Network delay (public frame) 40 25
Dejitter buffer 45
Totals 138 33