Page 1543 of 1814International ISDN PRI Feature description and administration1546Reference Clock SwitchingContentsThe following are the topics in this section:Regional material statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1543Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1543Operating parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1544Feature interactions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1544Feature packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1544Feature implementation . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1544Task summary list . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1544Feature operation . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1545Regional material statementThe information presented in this section does not pertain to all marketregions. Contact your system supplier or your Nortel Networks representativeto verify support of this product in your area.DescriptionReference Clock Switching allows a Clock Controller reference toautomatically switch to another tracking reference if the reference goes into anon-acceptable state (the Clock Controller can track on its primary reference,secondary reference, or be in free run). A non-acceptable state is consideredas one of the following:• The reference loop is disabled;
