PS-SAU-1900E
Mar. 8
th
,1999 (Rev. 0.0)
--- CONFIDENTIAL AND PROPRIETARY ---
10
2.
General Description of the Line Access Unit.
Figure 2.1.-1: Product Basic Block Diagram.
2.2. Main
board.
The LAU’s Main board provides the interface between the indicated modules. It also serves as the
mechanical mounting point and electrical interface for the LAU’s external connectors.
Transceiver
Circuits.
Power Supply
Module
•
Raw DC primary power.
•
Battery charging (13.5V).
•
Ring supply (-65 Vdc).
•
Talk battery (-24 Vdc).
•
Logic supply (5 Vdc).
•
Status indicators.
CDMA Module
Digital circuits
•
MSM controller.
•
BBA interface.
•
Program memory.
•
Data memory.
•
Configuration memory
•
Serial I/O..
Line Interface Module
(part of Main Board)
•
Analog telephone interface.
•
Caller ID function.
•
DTMF detect and decoder.
•
Programming interface.
Battery Management
Module
(Part of Main Board)
•
Supply source control.
•
Power-on RESET.
•
Battery charge control.
Main board
•
Inter-module interface.
•
External interfaces.
•
Control logic.
RF IN
Telephone IN
Telephone IN
Serial Interface
DC Power
Analog Fax Module
•
Modem Chip
•
Protocol interface
•
Fax buffer memory.
•
Configuration memory
•
Serial I/O..
•
Power Save.
