Optical Systems Design OSD2251BP Series Operator's Manual page 30

In Figure 26, node 1 will communicate with node 2, node 3 and node 4 via node 3. Node 2 will
communicate to node 4 only via node 1 and 3.
In the event of a fiber link being broken or disconnected (indicated by a cross) the backup branch will
become the active branch. If the link between node 1 and 3 is broken (see Figure 27), node 1 will
communicate with node 3 via node 2 and node 4.
When the float backup is in enabled mode, if the broken or disconnected branch is re-established, the
backup branch will now be the last broken/disconnected branch as shown in Figure 28.
Note: When configuring the float backup function all units on the ring/bus network must have the same
float backup configuration for correct operation. Differing backup configurations will cause segmented
backup branches and may not function as intended.
All OSD2251BP are set to enabled float backup upon shipment.
PAGE 30
OSD2251BP OPERATOR MANUAL
OPTICAL SYSTEMS DESIGN
Active
Branch
Back-up
2
Branch
FIGURE 27: FLOAT BACKUP ENABLED 2
Active
Branch
2
Back-up
Branch
FIGURE 28: FLOAT BACKUP ENABLED 3
1
3
4
1
3
4
DOC ID: 10119301