System for testing internal connectivity in ATM switching equipment
US6404740B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 14, 1998 |
| Grant date | Jun 11, 2002 |
| Priority date | — |
| Expiry date | Apr 14, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2012/5628
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A test system which can verify the internal connectivity in an ATM switching system by using loopback OAM cells, without establishing any dedicated channels or using special cells newly defined for test purposes. The connectivity test system produces a loopback OAM cell containing a local subsystem identifier in a predetermined field thereof to designate a specific local subsystem in the ATM switching system as the intended loopback point. This loopback OAM cell is transmitted to the ATM switching system by a transmission unit. A response unit, disposed in each local subsystem in the ATM switching system, receives the loopback OAM cell from the transmission unit through a certain physical link, and it checks the predetermined field of the received loopback OAM cell. If the identifier found in the field agrees with the local subsystem's own identifier, the response unit sends back the received loopback OAM cell through the same link so that it will be returned to the originator via the same route.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.