Figure 6-10 Spatial Reuse - Huawei OptiX OSN 7500 Technical Manual

OptiX OSN 7500
Technical Manual - System Description
Bandwidth of single ring is

Figure 6-10 Spatial reuse

5.
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.
Node 2
1.25Gbit/s
Fairness Algorithm
Huawei Technologies Proprietary
Node 1
Dual-ring
2.5 Gbit/s RPR
Node 3
6-13
6 Data Features
Traffic 1
1.25 Gbit/s
Node 4
Traffic 2
1.25 Gbit/s