The ITU-T recommendation G.987 defines the standard for a 10 Gigabit-capable passive optical network ofNext-Generation GPON
(NG-GPON). The entire standard consists of the following recommendations in addition to the base G.987 standardG.987.1: General Requirements for 10G PON Systems. Includes examples of services, subscriber network interfaces
(UNI), and service node interfaces (SNI), as well as the major deployment configurations requested bynetwork operators
G.987.2: Physical Media Dependent (PMD) Layer
Specification (approved 01/13/2010, updated 10/07/2010). Describes a flexible fiber access network that is an evolutionary development from G.984.2, asymmetric only in the current versionG.987.3: Transmission Convergence (TC) Specifications.