scope:

This part of ISO/IEC 15045 specifies a gateway architecture that provides an interconnection between one or more Wide Area Networks (WANs) and one or more Home Area Networks (HANs). This standard is not needed for a "simple gateway" linking one WAN to one HAN where there is no intention of future expansion, as illustrated in Figure 1. The scope of this standard applies to a "distributed gateway," as illustrated in Figure 1 and is also referred to in ISO/IEC 15045-1 as the Complex Modular Gateway. Also, this standard specifies how separate gateways in a single house can interoperate to provide co-ordinated functions.