Network synchronization over IP networks
US8238377B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 6, 2009 |
| Grant date | Aug 7, 2012 |
| Priority date | — |
| Expiry date | Jun 5, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L69/28
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Network timing is derived from the PSTN and distributed through the network to gateways capable of deriving timing from the incoming UDP stream. The derived timing has the correct frequency for voice telephony without using external timing sources or extraneous hardware components. For example, a digital signal processor (DSP) can derive the timing from a timed TDM bus and distribute messages, such as IP messages, to other gateways or port networks. The other gateways and port networks use the incoming stream to extract the timing which is then used to time their TDM bus. The port networks and gateways can also distribute other streams to other gateways in a fan-out type of arrangement. This internally generated timing can be used, for example, for Circuit Emulated Services (CES).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.