OPTICAL SYSTEMS DESIGN
DOC ID: 10115303
OSD2251P OPERATOR MANUAL
PAGE 28
In Figure 23, 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 24), node 1 will
communicate with node 3 via node 2 and node 4.
FIGURE 24: FLOAT BACKUP ENABLED 2
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 25.
FIGURE 25: FLOAT BACKUP ENABLED 3
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 OSD2251P are set to
enabled
float backup upon shipment.
1
2
3
4
Active
Branch
Back-up
Branch
1
2
3
4
Active
Branch
Back-up
Branch