NETWORK SYNCHRONIZATION ARCHITECTURE FOR A BROADBAND LOOP CARRIER SYSTEM (BLC)

摘要

This disclosure describes a Network Synchronization Architecture, which allo ws the synchronization hardware component to be co-located with the Optical Network Interface component. This architecture is used to provide network timing for a Network Element (NE) such as a BLC (Broadband Loop Carrier System). A Broadband Loop Carrier system is similar in functionality to a DLC (Digital Loop Carrier), the primary difference being the ability to provide some form of high speed data service such as AD SL (asymmetric digital subscriber loop). To accommodate this network timing architecture, the NE provides redundant timing paths between the combined Optical Network Interface/Synchronization Units o f which there are two for each system. A control function monitors the hardware and signal conditions to maintain functionality in the presence of hardware faults or input signal faults.