ITU-T G.8271 PDF

This Recommendation defines time and phase synchronization aspects in telecommunication networks. It specifies the suitable methods to distribute the reference timing signals that can be used to recover the phase synchronization and/or time synchronization according to the required quality. It also specifies the relevant time and phase synchronization interfaces and related performance.

The telecommunication networks that are in the scope of this Recommendation are currently limited to the following scenarios:

– Ethernet ([IEEE 802.3] and [IEEE 802.1Q]);

– multiprotocol label switching (MPLS) ([IETF RFC 3031] and [ITU-T G.8110]);

– internet protocll (IP) ([IETF RFC 791] and [RFC 2460]);

– optical transport network (OTN) ([ITU-T G.709]).

The physical layers that are relevant to this Recommendation are the Ethernet media types, as defined in [IEEE 802.3], and, for OTN, the optical OCh layer with optical transport network (OTU) frame as defined in [ITU-T G.709].