Page 786 - Cloud computing: From paradigm to operation
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4                                             Video processing and storage

























                                         Figure 7-2 – Function components of CSAU

            Service control function
            –       initiate, maintain and release the connection with the SCU;

            –       process the service requests from the CSMU, forward them to the SCU and respond to the CSMU.
            Media control function
            –       receive media data from the MDU, the PU, the MSU and/or other data source entities of the VS
                    system;
            –       transmit or forward media data into the CSDU cluster;
            –       receive media data distributed in the CSDU cluster;
            –       transmit or forward media data to the MDU, the CU and/or other related entities of the VS system.

            Configuration management function
            –       manage the overall configuration in the CSAU, including the service control, data transmission and
                    other media storage control.

            7.3     Reference points

            7.3.1   Reference point Pcs: PU-CSAU
            The reference point Pcs is located between the PU and the CSAU. It is used to deliver the media data directly
            from the PU to the CSAU according to the media storage requests.

            7.3.2   Reference point Mdc: MDU-CSAU
            The  reference  point  Mdc  is  located  between  the  MDU  and  the  CSAU.  It  is  used  for  the  media  data
            transmission between the MDU and the CSAU according to the media reading and writing requests.
            7.3.3   Reference point Ss: CSAU-SCU

            The reference point Ss is located between the CSAU and the SCU. It is used to control the CSAU registration,
            access  authentication,  authorization  and  accounting  by  the  SCU  and  is  used  for  the  control  signal
            transmission between the CSAU and the SCU.













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