User's Manual Chapter 13

Base FCC Regulatory Test Report
7-92
AT&T Wireless Services
FCC Type Acceptance Application
10991 Rev. 1.0 7/6/99
Figure 7.7— PWAN OSI Model
The physical layer is divided into six separate entities as follows:
• Voice Traffic channel entity (VTch)
• Associated Control Channel entity (ACC)
• Data Traffic channel entity (DTch)
• Common Access Channel entity (CAC)
• Common Link Channel entity (CLC)
• Broadcast Channel entity (BC)
The Voice Traffic, ACC and Data Traffic entities are the only entities
that communicate on both the uplink and downlink. The remaining
entities communicate on the link direction appropriate to their function.
SLICTime Slot
Interchanger
PWAN Base PWAN RU
Physical
Layer
Broadcast Channel (BC)
Common Link Channel (CLC)
Voice Traffic Channel (VTch)/Associated Control Channel (ACC)
Data Traffic Channel (DTch)
V-MACD-MAC
DLCLAP-W
NetworkSubnet
DTch
V-MAC D-MAC
DLC LAP-W
Network Subnet
DTch
ACC VTch
LD-CELP
&
Fax/
Modem
demod/
remod
Encryption
ACC VTch
Common Access Channel (UCAC and SCAC)
NAC:(BC,CLC,UCAC,SCAC
)
NAC:(BC,CLC,UCAC,SCAC)
LD-CELP
&
Fax/
Modem
demod/
remod
Encryption
Radio Propagation Environment