The scope of this implementation agreement is to define a set of services, physical transport technologies and signaling capabilities that may be implemented by manufactures and services providers to support users. This document is scoped to allow an early implementation based on current and newly available technologies and capabilities. This implementation agreement is not intended to restrict future additions. UNI is defined as the interface between the service provider network and user equipment (such as IP routers and other end systems), as illustrated in Figure 1-1. Figure 1-1 distinguishes between the transport links and the signaling link at the UNI. Furthermore, the figure illustrates two types of UNI interfaces covered in this specification. The left user domain illustrates UNI signaling between client and network entities that are not co-located with the corresponding network elements – also referred to as third party signaling. The right user domain illustrates a UNI over which direct signaling occurs between client and optical network elements over the transport links – also referred to as channel associated signaling and inband signaling.
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