Optical Systems Design OSD2251BP Series Operator's Manual page 32

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 30), node 1 will communicate with node 3 via
node 2 and node 4.
When the float backup is in disabled mode, if the broken or disconnected branch is re-established, the
backup branch will again be the furthest link from the smallest MAC addressed unit as shown in Figure
31.
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 32
OSD2251BP OPERATOR MANUAL
OPTICAL SYSTEMS DESIGN
Active
Branch
Back-up
2
Branch
FIGURE 30: FLOAT BACKUP DISABLED 2
Active
Branch
Back-up
2
Branch
FIGURE 31: FLOAT BACKUP DISABLED 3
1
3
4
1
3
4
DOC ID: 10119301