This optional module for the Control Card (90-4452-xx) provides system timing which can be derived from any line interface or BITS input (90-4451-01/03/04). This module has a wider capture range (+/- 50ppm) than the Stratum 3 SSU. Note, however, that this

This optional module for the Control Card (90-4452-xx) provides system timing which can be derived from any line interface or BITS input (90-4451-01/03/04). This module has a wider capture range (+/- 50ppm) than the Stratum 3 SSU. Note, however, that this is not a Stratum 3 clock source. Stratum 3 timing requires part no. 90-6499-01. This part satisfies the Australian regulatory requirement for CPE devices as stated in TS016.