On 12/6/03 12:09, "M. Adam Davis" wrote: > For those (like me) who didn't know what a stratum clock source is, > there's a good overview of the different levels here: > Stratum Levels Defined > http://www.laruscorp.com/tchap04.htm And it's not just "time" that's important in the Stratum world...frequency is equally important. Having a highly reliable clock source is required so that the number of frame shifts on your network (for example, SONET) are kept with in tolerance. Even DS0 and DS1 timing is derived from the Stratum system, so that carriers reliably know that their digital subscriber lines will "sync" with other carriers with acceptable tolerance. -marc -------------------------------------------------- Marc Nicholas Geekythings Inc. C/416.543.4896 UNIX, Database, Security and Networking Consulting -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics