scope:

This part of ISO/IEC 14543 specifies the services and protocol in a manner independent of the
physical layer for the data link layer and for the network layer and the transport layer for usage in
Home Electronic Systems.
ISO/IEC 14543-4 is designed to enable the use of power line and wireless protocols as transmission
media. Slow transmission speeds discourage large data transfers and it is desirable to reduce the
mounting load on simple devices. In light of this situation, this part of ISO/IEC 14543-4 specifies the
frame format for the Communications Middleware Block to minimize message size while fulfilling the
requirements of the communications layer structure.
This part of ISO/IEC 14543 specifies the Protocol Difference Absorption Processing Block and a part
of the Communications Processing Block. Figure 1 shows the relationship between the protocol of
ISO/IEC 14543-4 and HES reference model based on ISO/IEC 7498.