User's Manual Chapter 13

Base FCC Regulatory Test Report
7-88
AT&T Wireless Services
FCC Type Acceptance Application
10991 Rev. 1.0 7/6/99
Figure 7.4— PWAN Telephony Processing
Airlink
sub-NE
Airlink
sub-NE
VTch
TDM
(PCM)
(16 Kbps)
TDM
(PCM)
DS1/ESF
(PCM)
BASE
RU
TDM
(PCM)
Telephony
sub-NE
2-wire line
(analog)
Line
Interface
LD-CELP
Airlink Encoding
LDS/
IDT
D/A Conversion
GPS-based synchronization
PSTN-based
synchronization
NIF
Network
sub-NE
Guide to Abbreviations
PCM Pulse Code Modulation
DS1 Digital Signal Level 1 transmission facility (1.544 Mbps)
ESF Extended Superframe signal format
PSTN Public Switched Telephone Network
LDS/IDT Local Digital Switch / TR303 Integrated Digital Terminal
NIF Network Interface Function
TDM internal Time Division Multiplex signal
TSI Time-Slot Interchange
VTch Airlink Voice Traffic Channel (16 Kbps)
D/A Digital to Analog / Analog to Digital
GPS Global Positioning System
LD-CELPLow Delay-Codebook Excited Linear Prediction
NIC Network Interface Card
DNIF Digital Network Interface Function
GPS
DNIF
TSI
Airlink Encoding/
Decode
LD-CELP
PC with
NIC
DSN