IpsMode

• Base type Enumeration

An Intelligent Protection Switching mode. An SRP ring provides redundancy and protection from a failed node or a link/fiber cut through the use of IPS modes that are automatic or operator/user-configured. Automatic IPS modes take effect when the ring detects an event, a fiber cut, or a node failure and remain in effect until the wait-to-restore value expires. As the protection requests travel around the ring, the protection hierarchy is applied. All modes are signalled on the IPS messaging channel. If an node or fiber facility failure is detected, traffic going toward or coming from the failure direction is wrapped (looped) back to go in opposite direction on the other ring. The wrap around takes place on the nodes adjacent to the failure. This way the traffic is re-routed from the failed span. The ISP modes starting from the highest to the lowest level in the IPS protection hierarchy are: 'forcedSwitch' - an operator-configured mode which causes a high-priority protection switch wrap on each end of a specified span. 'signalFail' - an automatically-detected mode which causes a protection switch wrap on a span when a media signal failure is detected. 'signalDegrade' - an automatically-detected mode which causes protection switch wraps on a span when a media signal degrade is detected due to excessive Bit Error Rate. 'manualSwitch' - an operator-configured mode which causes a low-prioority protection switch wrap on each end of a specified span. 'waitToRestore' - an automatically-invoked mode which results in a waiting period after the working channel meets the restoration criteria after a signal fail or signal degrade condition disappears to prevent protection switch oscilation. 'normal' - a mode which can be configured by an operator, and/or is in effect when no other mode has been automatically detected/invoked.