3. Startup Process
3.1 Base station overview
As the core element in the SkyWay-Mobile system, the BTS is the bridge between
wireless transmission and wired backbone network. After the packet data signal is
received at the base station from backbone network, the message is mapped with EID of
the terminal and then forwarded to MDM board. After digital modulation at the DMD
board, the modulated signal undergoes channel packing and processing at the CHP
board and is converted into base-band signal, which is received by IF board from CHP
board. Then the signal transformed to intermediate frequency and transmitted to RFC
board. The signal, after transformation, is converted by RFC board to radio frequency,
forwarded to TTA and transmitted after amplification.
In the same way, the uplink signal is transmitted to cable backbone network via base
station in a reverse order. The routine operation of base station mainly focuses on the
power and system capacity of the base station system.
3.2 EMS configuration
Before power-on the base station, some basic parameters have to be input to
substations through serial port on the main board. These configuration parameters are
often used as “boot parameters", with which the base station can establish
communication with EMS server so that all configuration parameters can be downloaded
to base station from EMS.
To maintain normal communication links, EMS server is usually connected to the main
board of the base station through hub or switch (10/100 Base-T), while the debugging
computer is connected to the serial port on the main board through RS-232 serial cable.
The serial ports on the main board and debugging computer should be available at this
time. After this, the base station is initialized and configured through some general
communication software, such as HyperTerminal, the standard terminal emulation
software.
3.2.1 Basic procedures
Make sure that all RF cables at the base station are correctly connected. There are 8
data RF cables and 1 calibration RF cable, as indicated on the front panel of the BTS
unit.
Connect the Ethernet interface on the main board of the base station to a network switch
using a standard Ethernet cable and then connect the switch to the PC with EMS server
installed using another Ethernet cable.
Connect the serial port on the main board of BTS to the serial port of debugging
computer through RS-232 cable (DB-9 male-female). Power-on EMS server and start
debugging computer. Configure FTP server tool. It can be installed on any computer that
can communicate with BTS or EMS.
