User guide

Managing 1+1 Hot Standby links Chapter 7: Operation
7-50
phn-2513_004v000 (Oct 2012)
Making the Primary unit the active unit
If the replacement unit is configured as Primary, you may wish to make this the active
unit, for example, if it is connected to the lower loss arm of an asymmetric coupler. This
can be done by forcing a protection switch, see Managing 1+1 Hot Standby links on page
7-33. Alternatively, the CMU configured as Secondary may be configured with the Primary
Recovery feature enabled, in which case there will be an automatic protection switch
making the Primary CMU active once the Primary unit has been continually free of faults
for a configurable period of time. See Configuring 1+1 Hot Standby links on page 6-54.