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Unleashing the potential of the Internet of Things 5
Figure 6 – Reference points between device, gateway and network application server
The D-SL reference point allows a device application in a device to access the ITU-T M2M service
layer in the same device or in the gateway. The D-SL reference point between device application and
service layer in a gateway is for legacy devices which do not have ITU-T M2M service layer
capabilities.
The G-SL reference point allows a gateway application in a gateway to access the ITU-T M2M
service layer in the same gateway.
The A-SL reference point allows a network application server to access the ITU-T M2M service layer
in the same network application server.
The SL-SL reference point allows the ITU-T M2M service layer in a device, gateway or network
application server to access the ITU-T M2M service layer in a different device, gateway or network
application server.
Rec. ITU-T Y.4413/F.748.5 (11/2015) 781
