PN-4407 (to be published as TIA/EIA TSB-110)
The purpose of this document is to promote industry comments on the minimum application, features, and operational parameters of a Residential Gateway (RG). The recommendations included herein are based on the interface and mediation requirements at the customer premises necessary to effectively utilize existing and emerging telecommunication service access and delivery systems. The document describes the basic functions of the RG, and recommends the associated hardware and software interfaces. When sufficient industry comments are received by the formulating committee, implementation specifications for the RG will be develped and published in a subsequent standard.
The Residential Gateway is intended to provide a common intelligent interface between the service access distribution networks and the consumer's in-home networks and devices. The interface and mediation capabilities of the RG should enable independent evolution of the technologies and physical media used in the destribution network and in the home. This attribute of the RG should make evolution and innovation in both the service delivery and consumer arenas feasible. It should enable service providers and application vendors to offer a variety of multimedia services while masking the complexity of the service access from the consumer.
1.3 Mandatory Advisory Terms
In accordance with TIA Engineering Style Manual [TIA_Style] two categories of performance standards are specified: mandatory and advisory. The mandatory performance criteria are designated by the word "shall" while advisory criteria are designated by the words "should," "may," or "desireable" (which are used interchangeably in this docment).
The mandatory criteria generally apply to performance and compatibility issues. They specify the absolute minimum acceptable performance requirements in areas such as transmission, equipment parameters, and durability.
Advisory or desirable criteria represent "above minimum" product goals. In some instances, these criteria are included in an effort to assure universal product compatibility on a national or global basis even with equipment and facilities operational in statistically small quantities. In other cases, advisory critera are presented when their attainment will enhanse the general performance of the service or product in complicated applications.
Where both mandatory and advisory levels are specified for the same criterion, the advisory level represents a goal currently identifiable as having distinct compatibility or performance advantages, or both, toward which future designs should strive.
Although mandatory performance criteria has been designated in this document, these requirements are all subject to change during the follow-on work that should result in the published standard.
1.4 Metric Equivalents of US Customary Units
The majority of the metric dimensions in this Standard are soft conversions of US customary units; e.g. 100 mm is the soft conversion of 4 inches.