SYNCHRONIZATION AND DOWNCONVERSION IN TDM/TDMA SYSTEMS

摘要

In a fiber-to-the-curb telecommunication system a method of network synchronizat ion is presented in which data is transmitted from a broadband network unit (240) to devices in a residence (290) on a downstream c arrier frequency, where the downstream data rate and the downstream carrier frequency are integer multiples of a sub-harmonic of a master clock. In the upstream direction, where data is transmitted from the devices to the broadband network unit (240), upstream data is transmitt ed on an upstream carrier frequency and the upstream data rate and upstream carrier frequency are integer multiples of a sub-harmonic of a master clock. Digital downconversion is performed on the data received at the broadband network unit (240) to produce baseband samples.