Method and apparatus for auto detection of AAL5 type frames for VCC and VPC switches
US6625120B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1999 |
| Grant date | Sep 23, 2003 |
| Priority date | — |
| Expiry date | Apr 28, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2012/5658
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In Asynchronous Transfer Mode (ATM) communications networks, certain congestion control features, such as Partial Packet Discard (PPD) and Early Packet Discard (EPD), operate on ATM cells that have been segmented from ATM Adaptation Layer #5 (AAL5) frames (packets). AAL5 frames are automatically detected by observing transitions of an indicator in the ATM cell header unique to AAL5 traffic. Automatic detection of AAL5 traffic allows enablement of packet-aware cell discarding techniques such as PPD and EPD on a Virtual Channel Connection (VCC) basis, whether in a switch for a VCC or for a Virtual Path Connection (VPC) to which the VCC belongs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.