User's Manual

12 Description TB9300 Installation and Operation Manual

1.2 Modules

The base station consists of a subrack with up to two physical transmit/

receive channels.

The single PMU (power management unit) supplies and manages power to

the whole subrack (refer to “Theory of Operation” on page 21). One reciter

and one PA (power amplifier) are needed for each physical transmit/receive

channel. There is also a front panel with user controls and fans. The

modules are interconnected at the front of the subrack. External

connections to the modules are located at the rear.

Modules come in different variants depending, for example, on the RF

band or the supply voltage.

Each module is inserted into the 4U subrack from the front and is secured

at the front with a metal clamp. Both clamp and module are easily removed

for rapid module replacement. The modules are secured laterally with

plastic guides that clip into the top and bottom of the subrack. These guides

can be easily repositioned to change the configuration of a subrack. The

heavier modules are also secured laterally by metal tabs at the rear of the

subrack.

The following provides a brief description of the available modules.

Subrack The 4U subrack is made of passivated steel and is designed to fit into a

standard 19 inch rack or cabinet. The subrack is fitted with an interconnect

board that connects the system control bus and power to the modules and

front panel. The position of a module in the subrack is defined by the socket

on the subrack interconnect board to which the module is connected by the

system control bus.