Graphical representation of SONET secondary states

The protection switch indicators are always represented by icons that appear near the end of the link on which they are set.

Secondary state names

In Icon-based representations of SONET secondary states, the symbolic name “ Secondary State Definition ” that appears after each “Secondary State Name” corresponds to the static secondary state definition. For example, the “Manual Switch” secondary state is defined by ManualSwitch , which corresponds to the static definition ManualSwitch.

Secondary state icons

It is possible to change the icon associated with a secondary state by using global settings, see Using global settings. The icon property name to be used with IltSettings.SetValue() must only include the secondary state definition. For example:
  • SONET.Protection.ManualSwitch.Icon
    where:
    • ManualSwitch is the secondary state definition of the “Manual Switch” state
For more information on how to use global settings to modify the SONET secondary state icons, see Customizing the SONET state system.
Icon-based representations of SONET secondary states
Secondary State Name
Secondary State Definition
Icon
Comment
Exercisor
Exercisor
ilt_testing.png
Facility is currently undergoing test.
Forced switch
ForcedSwitch
forced.gif
Forced protection switch request has been triggered.
Locked
Locked
locked.gif
No traffic is allowed on the facility. This restriction may be imposed for maintenance reasons.
Manual switch
ManualSwitch
manual.gif
Manual protection switch request has been triggered.
Pending
Pending
pending.gif
Pending protection switch request.
Wait-to-restore
WaitToRestore
wait2rst.gif
Waiting for the facility service to be restored.