This enabled/disabled setting controls payload scrambling on an STS-3c or STM-1 SONET/SDH line, and it defaults to enabled, which is the standard behavior most equipment expects to avoid long strings of repeated bit patterns in the payload. An admin cares because disabling payload scrambling against the far end's expectation will produce transmission errors or line failures, since scrambling settings must match between both ends of the link. For example, if a far-end device connected over this line comes up with persistent bit errors, confirming both ends have matching payload scrambling settings (both enabled, matching the default) is a standard troubleshooting step.