User's Manual Chapter 13

Base FCC Regulatory Test Report
7-82
AT&T Wireless Services
FCC Type Acceptance Application
10991 Rev. 1.0 7/6/99
7.1 System Overview
7.1.1 PWAN General Description
The AT&T Fixed Wireless Services PWAN is a Remote Digital
Terminal (RDT) system that has been designed to operate over a
wireless interconnect. Traditional RDT systems have always been
based upon a wireline interface between the Local Digital Switch
(LDS) and the subscriber RDT. The PWAN utilizes a wireless radio
interface (the PWAN Airlink) between the network and line-side
interfaces of a Bellcore TR-303 compliant RDT. For that reason, the
PWAN RDT is named the Wireless Remote Digital Terminal (WRDT).
Although it incorporates wireless elements, the PWAN is intended
solely for local loop replacement and will not support typical wireless
mobility features such as intercell handoff or roaming. The PWAN
Airlink utilizes a proprietary radio technology capable of providing a
secure wireless interface to the WRDT.
As in a traditional RDT system, the PWAN includes telephony network
elements and management network elements. The PWAN telephony
network elements (NE) are the Base Station (Base) and Remote Unit
(RU). The management NEs are the Wireless Network Management
System (WNMS), Wireless Element Management System (WEMS),
and the Base. For an illustration of how these network elements
interact, refer to Figure 7.1—.
7.1.2 PWAN Network Element Overview
The Base NE terminates the TR-303 interface to the Local Digital
Switch (LDS) and the Management Operations Channel (MOC) to
WEMS. The Base also supports multiple airlink connections to the RU
population served by it.
The RU NE terminates the subscriber analog line interfaces while at the
same time performing the line interface functions of a traditional RDT.
The RU also supports its connection to the Base via the airlink.
In order to support management functions within the PWAN network,
the WEMS serves as an element manager for Operations,
Administration, Maintenance, and Provisioning (OAM&P) functions
that supplement traditional TR-303 RDT OAM&P. The WNMS
provides network provisioning and monitoring. The WNMS also