User's Manual

2.2.1 Connecting with Ethernet

Ethernet is the most powerful interface of the base station, especially for remote

monitoring and controlling via Internet. Each base station has a unique IP address, to

connect, the host PC must be in the same sub net with the base station.

2.2.2 Connecting with USB

The front-panel USB connector can be also used for connecting to host PC, the

operation system need a proper driver to recognize the base station. Make sure the

diver is installed in host PC so that Service Kit can communicate properly with the base

station via the USB interface.

2.2.3 Connecting with RS232 (optional)

The RS232 share the same internal serial port with the USB interface, only one (either

RS232 or USB, if both interface are connected, USB has the priority) of them can be

used at the same time.

Only three wires (TXD, RXD and GND) are used in this RS232 interface. The

transceiver supports up to 115.2kbps data rate, make sure the host PC serial port

setting is 8 data bits, 1 stop bit, none parity and no flow control.

2.3 CIRCUIT DESCRIPTION

The following descriptions should be read as an aid to understanding the block and

schematic diagrams given in the appendix of this manual.

The transceiver consists three major subparts: Processor (Master) board, Interface

(Main) board, and RF modules.

2.3.1 Processor (Master) board

The Processor (Master) board is a six-layer, double side component mounted PCB

assembly. The most important parts of the base station, such as CPU, DSP and digital

IF receiver, are embedded in this master board, two 40-pin connectors on this board

allows user inserting/removing it from the interface (main) board.

The CPU (U1) is a single chip 32-bit RISC processor, it controls all the operating

functions of the base station. The support chips include a 16Mbyte Flash (U9) and

64Mbyte SDRAM (U7, U8). The base station software and configuration databases are

stored in the Flash memory. The system serial bus and GPIO of the RISC processor are

connected to the system interface board via two 40-pin connectors.