ITU-T Recommendations

Recommendation ITU-T G.7714.1/Y.1705.1 describes the methods, procedures and transport plane mechanisms for discovering layer adjacency for automatically switched optical networks (ASON) according to the requirements of Recommendation ITU-T G.7714/Y.1705 and architecture of Recommendation ITU-T G.8080/Y.1304. Layer adjacency discovery describes the process of discovering the link connection end-point relationships and verifying their connectivity. Two alternative methods are described: one using a test set in the client layer, the other using in-band overhead in the server layer. Additional actions that may be required for obtaining physical media adjacency discovery and transport entity capability exchange, etc., will be addressed in future Recommendations.This 2010 revision includes: Appendix VI (Usage of the different discovery mechanisms) from ITU-T G.7714.1/Y.1705.1 (2003) Amendment 1 (2006); clause 5.1 (CP-CP connectivity relationships determination); clause 9.3 (Interoperable solution when using the ECC-based mechanism) and the inclusion of ODU TCM layer discovery in clause 6.