If you are referring to clock slips in digital carrier systems,
you cannot "fix it" with external hardware. It is indicative of
a timing problem.
Describe your circumstance in more detail, and someone can explain
what it means. As it is, you've asked too broad a question to be
answered in a single Usenet post.
--
Floyd L. Davidson <http://www.apaflo.com/floyd_davidson>
Ukpeagvik (Barrow, Alaska)
floyd@apaflo.com