Section: K.2.1 Capability exchange
Content: DS-TT and NW-TT indicate time synchronization information they support inside the Port management capabilities (see Table K.1-1). TSN AF and TSCTSF may determine the PTP functionalities supported by DS-TT and NW-TT by retrieving the following port management information or user plane node management information, respectively: - Supported PTP instance types; - Supported transport types; - Supported PTP delay mechanisms; - Grandmaster capability; - Supported PTP profiles; - Number of supported PTP instances. NOTE: If NW-TT or DS-TT do not indicate support for any of the PTP profiles and PTP instance types, then TSN AF or TSCTSF assume that the NW-TT or DS-TT only support acting as a PTP Relay instance with the gPTP GM connected on N6. If DS-TT and NW-TT support the PTP Relay instance type as defined by IEEE 802.1AS [104] then DS-TT and NW-TT shall include the IEEE 802.1AS [104] PTP profile in the "Supported PTP profiles" in PMIC and UMIC, respectively. The TSN AF or TSCTSF may retrieve the "Number of supported PTP instances" from NW-TT via UMIC and from DS-TT via PMIC.