OptiX OSN 7500
Technical Manual - System Description 6 Data Features
Huawei Technologies Proprietary
6-13
Node 1
Bandwidth of single ring is
1.25Gbit/s
Node 2
Node 3
Node 4
Dual-ring
2.5 Gbit/s RPR
Traffic 1
1.25 Gbit/s
Traffic 2
1.25 Gbit/s
Figure 6-10 Spatial reuse
5. Fairness Algorithm
The outer ring and the inner ring of an RPR support independent weighted fairness
algorithm. The fairness algorithm assures access of the low-class B_EIR and C
services. The weight of the fairness algorithm is provisionable to decide the access
rate of a node. A node needs to set weights at the outer and the inner rings, and the
two weights decide the bandwidth of low-class services upon bandwidth contention.
As shown in Figure 6-11, the outer ring weights of nodes 2, 3 and 4 are 1. Suppose the
available bandwidth on the outer ring for low-class services is 1.2 Gbit/s, the fairness
algorithm will allocate 400 Mbit/s for the low-class services from nodes 2, 3 and 4 to
node 1 respectively. Figure 6-12 shows a fairness algorithm with different weights: the
weights of nodes 2, 3 and 4 on the outer ring are 1, 3 and 2 respectively. The fairness
algorithm allocates 200 Mbit/s for node 2, 600 Mbit/s for node 3 and 400 Mbit/s for
node 4.
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