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Cisco ONS 15454 Installation and Operations Guide
November 2001
Chapter 5 SONET Topologies
Unidirectional Path Switched Rings
Figure 5-26 Using the span shortcut menu to display circuits
Step 3 On the Circuits on Span dialog box (Figure 5-27), select the protection from the Switch all UPSR
circuits away menu:
• CLEAR removes a previously-set switch command.
• MANUAL switches the span if the new span is error free.
• FORCE forces the span to switch, regardless of whether the new span is error free.
• LOCKOUT locks out or prevents switching to a highlighted span. (LOCKOUT is only available
when Revertive traffic is enabled.)
Caution FORCE and LOCKOUT commands override normal protective switching mechanisms. Applying
these commands incorrectly can cause traffic outages.