System and method for external timing using a complex rotator
US6327666A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 1998 |
| Grant date | Dec 4, 2001 |
| Priority date | — |
| Expiry date | Jan 27, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/0334
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An improvement to system timing and synchronization in a digital transceiver allows the synchronization of a transceiver located at a central office to a network or system clock without the use of any additional transmitted bits or additional external circuitry. The system allows a transceiver to achieve timing and synchronization lock to a system master clock, such as a T1 or E1 clock, by operating on the two level input clock with a complex rotator to develop an error signal which allows a phase locked loop circuit to drive a frequency synthesizing device, which in turn drives a system clock. The system clock provides an input to a complex generator, which in turn develops a complex rotation function. The complex rotation function allows the transceiver clock to synchronize to the network master clock.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.