This part of IEC 62056 specifies a connection-less and a connection oriented transport layer (TL) for DLMS/COSEM communication profiles used on IP networks.
These TLs provide OSI-style services to the service user DLMS/COSEM AL. The connection- less TL is based on the Internet Standard User Datagram Protocol (UDP). The connection- oriented TL is based on the Internet Standard Transmission Control Protocol (TCP).
The DLMS/COSEM TL consists of the UDP or TCP transport layer TCP and an additional sublayer, called wrapper.
Annex A shows how the OSI-style TL services can be converted to and from UDP and TCP function calls.dition 1.0 2015-05 INTERNATIONAL STANDARD NORME INTERNATIONALE colour inside Electricity metering data exchange – The DLMS/COSEM suite – Part 4-7: DLMS/COSEM transport layer for IP networks échange des données de comptage de l'électricité – La suite DLMS/COSEM – Partie 4-7: Couche transport DLMS/COSEM pour réseaux IP IEC 62056-4-7:2015-05(en-fr) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright ？ 2015