scope:

Scope, Purpose, and Application

This standard provides loss plan requirements for networks that are all digital from Digital End Office-to-Digital End Office (DEO-to-DEO). Such digital networks can be Time Division Multiplex (TDM) or packet-based. Access lines connected to the DEO may be digital or analog.

The term DEO includes the concept of a DEO Complex, for those instances when the DEO functional components are geographically distributed. The DEO Complex may include the DEO plus Remote Switching Unit (RSUs), Remote Digital Terminal (RDTs), and Optical Network Units (ONUs). The terms DEO and DEO Complex are used interchangeably throughout this document.

This standard is intended to support services carried on the Public Switched Telecommunications Network (PSTN). These requirements assume that all terminal equipment and networks connecting with the DEO are in compliance with standards pertinent to their transmission performance.

It is intended that these requirements be implemented in an evolutionary manner and not retroactively.

The purpose of this standard is to support the end-to-end transmission performance of voice-grade services by providing loss requirements for DEOs that connect to networks and terminals for which compatible transmission standards have been developed. An additional purpose is to ensure correct and easy interconnection of Incumbent and Competitive Exchange Carrier networks, Exchange Carrier (EC) and Interexchange Carrier (IXC) networks, as well as connections with terminal equipment and interconnecting networks for which compatible standards have been developed.

Figure 1 illustrates the how the DEO Complex connects voice terminals, voice gateways, Enterprise networks, and interconnecting networks. It also details the port/interface acronyms that are used for the loss plan requirements.