PN-4407 (to be published as TIA/EIA TSB-110
The Residential Gateway should incorporate means to address POTS service survivability in the event of commercial power outages, RG system failures, or RG unavailability. These means should accommodate fail-safe modes for analog POTS that is delivered through the Residential Gateway (no active elements, no mediation, metallic from power source to sink), and for the higher level communications, entertainment, information, utility, and home automation services that are terminated, mediated, enabled and distributed to home networks via the RG.
Although the residential gateway shall operate in physical environments that have been cabled in a star wired topology as specified in TIA/EIA 570A, the RG shall support operation in other topologies.
As shown in Figure 2, the Residential Gateway shall be comprised of an enclosure, plug-in modules, and an Internal Digital Interface (IDI, bus-matrix fabric) arranged to accommodate the plug-in modules. The plug-in modules shall, at a minimum, comprise:
Access Gateway Modules (AGMs) designed to terminate and mediate the associated external access. The AGMs implement the functions of the network interface units as described in TIA/EIA TSB109, Multimedia Reference Architecture.
Premises Network Modules (PNMs) designed to terminate the in-home networks technologies and services The PNMs implement the functions of the customer premises interface units as described in TIA/EIA TSB109, Multimedia Reference Architecture.
Additional plug-in modules called Service Modules (SMs) may be supported to provide specialized services or to supplement the features and capabilities of the RG.
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Automatic Meter Reading
Figure 2. A Typical Residential Gateway Application
The functionality and inter-operability of the plug-in units and the core processes and integrity of the RG shall be controlled by a single operating system and one or more central processing units.
4.3 Operating System
The Operating System (OS) of the Residential Gateway should enable the smooth inter- operation of devices, services, and networks within the residence so that the complexity, distribution, and technical disparity of the system elements is hidden from users.