External Switching Commands - Cisco ONS 15600 Reference Manual

Chapter 3 Card Protection

3.3 External Switching Commands

Figure 3-2 ONS 15600 SDH in an Unprotected Configuration
Working STM-N TSC SSXC SSXC TSC Working STM-N
3.3 External Switching Commands
The external switching commands on the ONS 15600 SDH are Manual, Force, Lockout, and Lock-on.
A Manual switch will switch traffic if the path has no errors or an error rate less than the signal degrade
(SD) threshold. A Force switch will switch traffic even if the path has an SD or signal fail (SF) condition;
however, a Force switch will not override an SF condition 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).
Cisco ONS 15600 SDH Reference Manual, Release 9.0
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