Each grouping, or time slot, typically carries a single-direction voice circuit for processing. Our concern is network timing, which is the need to accommodate different time delays when multiple bit streams terminate in a single network element such as a long-distance message switch. However, transmission and network operating impairments could cause intermittent and brief frequency degradation's that exceed this objective. In The distributed PRC approach. This new synchronization network has rich connectivity and unique verification capabilities.
Verification involves directly monitoring the timing performance at each node.
Each PRC simultaneously monitors timing signals from at least two other PRC nodes, as well as from secondary nodes. Monitoring of neighboring PRCs provides tracking and verification of synchronization of data over periods measured in weeks to parts in 10 -13 . Two independent PRCs can monitor secondary nodes for timing instabilities within the timing system or those caused by transmission path anomalies. Because PRCs are located close to secondary nodes, the system has attained a uniformly stable transmission path performance for both transmitting and monitoring. Daily transmission path stability exceeds severaL Parts in 10 -12 .