Update note at the beginning of the YANG module #74
Description
Problem:
There is a user guide like note at the beginning of the YANG of the YANG module.
It defines the synchronization modelling to have uni-directional LTPs.
Now as we decided to change for bi-directional LTPs, this text needs to be updated.
Proposal to the LF ONMI x-haul call on 9th of July 2025:
The text at the beginning of the YANG module shall be changed from:
This synchronization model augments the ONF Core Information Model to manage wireless transport devices according to ITU-T G.7721-2018. The following section gives guidance with respect of the usage of the ONF Core Information Model when implementing ITU-T G.8264 'Hybrid SDH/synchronous Ethernet SETG Function'. The ONF Core Information Model is flexible enough to cover all possible implementations described by Figure A.2.
Recommendation for implementing 'Hybrid SDH/synchronous Ethernet SETG Function':
- The LogicalTerminationPoints representing a synchronization related termination point are unidirectional.
- The Selectors A, B and C should be represented as ForwardingConstructs with FC-Switches.
- The Selector B and the SETG function should be represented as a single ForwardingConstruct. Note: It is implementation specific, whether the output of the SETG function is represented by 0 or 1 or 2 LogicalTerminationPoints of LayerProtocol 'LAYER_PROTOCOL_NAME_TYPE_SYNCHRONIZATION_LAYER'.
- If Selector A and Selector C are represented as individual ForwardingConstructs, then a LogicalTerminationPoint of LayerProtocol 'LAYER_PROTOCOL_NAME_TYPE_SYNCHRONIZATION_LAYER' must exist representing the output of Selector A and at the same time the input of Selector C.
- Configuration which are not supported by the device, shall result in ErrorMessages (e.g. Function not supported).
- The LTPs of LayerProtocolType == LAYER_PROTOCOL_NAME_TYPE_PTP_LAYER shall be clients to LTPs of LayerProtocolType == LAYER_PROTOCOL_NAME_TYPE_ETHERNET_CONTAINER_LAYER.
to
This synchronization model augments the ONF Core Information Model to manage wireless transport devices according to ITU-T G.7721-2018. The following section gives guidance with respect of the usage of the ONF Core Information Model when implementing ITU-T G.8264 Hybrid SDH/synchronous Ethernet SETG Function. The ONF Core Information Model is flexible enough to cover all possible implementations described by Figure A.2.
Recommendation for implementing Hybrid SDH/synchronous Ethernet SETG Function:
- The LogicalTerminationPoints representing a synchronization related termination point are bidirectional.
- The Selectors A, B and C should be represented as ForwardingConstructs with FC-Switches.
- The Selector B and the SETG function should be represented as a single ForwardingConstruct. Note: It is implementation specific, whether the output of the SETG function is represented by 0 or 1 or 2 LogicalTerminationPoints of LayerProtocol LAYER_PROTOCOL_NAME_TYPE_SYNCHRONIZATION_LAYER.
- If Selector A and Selector C are represented as individual ForwardingConstructs, then a LogicalTerminationPoint of LayerProtocol LAYER_PROTOCOL_NAME_TYPE_SYNCHRONIZATION_LAYER must exist representing the output of Selector A and at the same time the input of Selector C.
- Configuration which are not supported by the device, shall result in ErrorMessages (e.g. Function not supported).
The following section gives guidance with respect of the usage of the ONF Core Information Model when implementing IEEE 1588.
Recommendation for implementing Precision Time Protocol (PTP):
- The LTPs of LayerProtocolType == LAYER_PROTOCOL_NAME_TYPE_PTP_LAYER shall be clients to LTPs of LayerProtocolType == LAYER_PROTOCOL_NAME_TYPE_ETHERNET_CONTAINER_LAYER.