OPTICAL SYSTEMS DESIGN
DOC ID: 10115304
OSD2251P OPERATOR 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.
FIGURE 30: FLOAT BACKUP DISABLED 2
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.
FIGURE 31: FLOAT BACKUP DISABLED 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