A Stratum 1 clock may control strata 2, 3E, 3, 4E, or 4 clocks. A Stratum 2 clock may drive strata 2, 3E, 3, 4E, or 4

clocks. A Stratum 3E clock may drive strata 3E, 3, 4E or 4 clocks. A Stratum 3 clock may drive strata 3, 4E or 4 clocks.

A Stratum 4E or 4 clock is not recommended as a source of timing for any other clock system.

 

    Because of the narrower capture and adjustment range of the higher strata clock systems (2 is higher than 3, and so

on), driving a Stratum 2 clock from a Stratum 3E or 3 clock is not recommended. In fact, it will not work under some

transmission impaired conditions. Also, extreme care must be taken in network applications where more than one

Stratum 1 source is used to ensure that these sources are accurate and traceable to some other standard. Another

standard commonly used to check on a Stratum 1 clock source’s accuracy is the GPS System. A GPS receiver can also

be used directly as a source of Stratum 1 quality.

 

    Stratum 1 clock administration, operation, and maintenance can be a costly effort. Atomic sources may not have long

maintenance-free operating intervals, and may experience failures without giving an indication that the source is off

frequency. In addition, if a Stratum 1 source of timing is shown to be inaccurate, the network must be able to accept

another network’s timing until the problem is corrected. Thus, GPS is attractive in order to assure accuracy and minimize

cost.

good article.

great presentation

Its required for understanding the clock connectivity.

A GPS receiver can also be used directly as a source of Stratum 1 quality.

So, Stratum-1 is more effective.

useful document, thanks