User's Manual Chapter 13

Base FCC Regulatory Test Report
7-86
AT&T Wireless Services
FCC Type Acceptance Application
10991 Rev. 1.0 7/6/99
Figure 7.2— PWAN Figure OSI Model
7.1.5 PWAN Telephony Functions
The airlink functions for telephony traffic are carried out utilizing the
protocol profile depicted in Figure 7.3—. Control information, such as
call establishment requests from an RU to the serving Base or call
termination requests from the Base to an RU are carried out through the
airlink protocol stack. Voice traffic, on the other hand, is passed from
the associated telephony interface directly to the physical layer.
Consequently, the physical layer is subdivided into entities allocated to
supporting specific functions, such as control channel management,
traffic channel management, and broadcast data management. Each
entity communicates with the Media Access layer through its Service
Access Point (SAP). The Media Access layer serves as an airlink
management interface between the multiple entities within the physical
layer and the Data Link layer.
Datalink Control
Voice Media Access
PWAN Network
Layer
Physical
Layer
Data Link Layer
Voice Media Access
Lower and Upper
Subnetwork
Control Protocol
Network
Layer
Datalink
Layer
RME
DTch
ACC VTch
NAC:(BRC,CLC,CAC)