Alcatel-Lucent 7210 SAS-D Configuration Manual page 456

System Commands
Context clear>system
Description
This command allows an operator to individually clear (re-enable) a previously failed reference. As
long as the reference is one of the valid options, this command is always executed. An inherent
behavior enables the revertive mode which causes a re-evaluation of all available references.
Parameters
ref1 — clears the first timing reference
ref2 — clears the second timing reference
Page 456 7210 SAS D, E, K OS Basic System Configuration Guide