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4.12 Failure Reporting: SD, SF, SDG, SFG. 4.13 External commands: Lockout, Freeze, Forced Switch, Manual Switch 4.14 Unidirectional versus Bi-Directional Recovery Switching 4.15 Full versus Partial Span Recovery Switching 4.16 Recovery Schemes Related time(rs) and Duration 4.17 Impairment 4.18 Recovery Ratio 4.19 Hitless Protection Switch 4.20 Network Survivability 4.21 Survivable Network 4.22 Escalation Section 4 Content (2) |