scope:

This Recommendation addresses management aspects of optical transport network elements containing transport functions of one or more layer networks of the optical transport network (OTN) as described in [ITU-T G.709]. The management of optical layer networks is separable from that of its client layer networks; therefore, the same means of management can be used regardless of the client. The management functions for fault management, configuration management, account management, performance management and security management are specified.

This Recommendation describes the management network organizational model for communication between an element management layer (EML) operations system and the optical equipment management function within an OTN network element.

The architecture described in this Recommendation for the management of optical transport networks is based upon the following considerations:

- The management view of network element functional elements should be uniform whether those elements form part of an inter-domain interface or part of an intra-domain interface. Those properties necessary to form such a uniform management view are to be included in this Recommendation.

- Optical layer network entities (OLNEs) refer to trail termination, adaptation, connection functions as described in [ITU-T G.872].

- A network element may only contain optical layer network entities.

- A network element may contain both optical layer network entities (OLNEs) and client layer network entities (CLNEs).

 - Client layer entities are managed as part of their own logical domain (e.g., SDH management network).

- CLNEs and OLNEs may or may not share a common message communications function (MCF) and management application function (MAF) depending on application.

- CLNEs and OLNEs may or may not share same agent.