Passive Optical Networks

Figure 5.7 The principle of Fair Queuing. 226

Figure 5.8 Operation of limited service IPACT: (a) when only

ONU#3 has upstream traffic; and (b) when all ONUs

have upstream traffic. Here, R1, R2, and R3 represent

request messages from each ONU respectively; data#3

represents user data transmitted from ONU#3, G3

represents grant for ONU#3. In (a), the values of R1 and

R2 are equal to 0 and the value of R3 indicates amount

of upstream user data stored in ONU#3. 230

Figure 5.9 Deficit round-robin (DRR) scheduling. 234

Figure 5.10 Maintaining short round-robin cycle using multiple

queue request. 235

Figure 5.11 An example with two types of requests. 235

Figure 5.12 An IEEE802.3ah REPORT frame with multiple

requests. 236

Figure 5.13 Burst allocation example of ...