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Cisco ONS 15600 Reference Manual, R7.2
Chapter 3 Card Protection
3.3 External Switching Commands
A Manual switch will switch traffic if the path has an error rate less than the signal degrade. A Force
switch will switch traffic even if the path has signal degrade (SD) or signal fail (SF) conditions;
however, a Force switch will not override an SF on a 1+1 protection scheme. A Force switch has a higher
priority than a Manual switch.
Lockouts prevent traffic from switching to the protect port under any circumstance, thus they can only
be applied to protect cards. Lockouts have the highest priority. Another way to inhibit protection
switching in a 1+1 configuration is to apply a lock- on to the working port. A working port with a lock-on
applied cannot switch traffic to the protect port in the protection group (pair).