Network clocking is the means by which a clock signal is generated or derived and distributed through a network and its individual nodes for the purpose of ensuring synchronized network operation. Network clocking is an important design consideration in many ATM networks. A solid network clocking design is essential to the successful deployment of any ATM network that will carry voice or video traffic.Cisco offers this Stratum 3 clock module. Network clock redundancy is ensured in the hardware if the system has route processors (RPs) with the Stratum 3 clock module.