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Figure 5 – Reference points of the ITU-T M2M service layer

As described in clause 6.1, three types of applications are identified on top of the ITU-T M2M service
layer (application layer): DA, GA and NA servers. DA, GA and NA reside, respectively, in a device,
gateway and network application server. All these applications can use capabilities provided by the
ITU-T M2M service layer.

Four different reference points are identified for the ITU-T M2M service layer: D-SL, G-SL, A-SL
and SL-SL. D-SL is the reference point between the DA and the ITU-T M2M service layer, G-SL is
the reference point between the GA and the ITU-T M2M service layer, A-SL is the reference point
between NA and the ITU-T M2M service layer, and SL-SL is the reference point between the
ITU-T M2M service layers residing, respectively, in device, gateway and network application
servers.

9.2 Details on the reference points

Figure 6 provides a detailed illustration of the reference points described in Figure 5.

780 Rec. ITU-T Y.4413/F.748.5 (11/2015)