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16 Description TB9300 Installation and Operation Manual

1.4 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 27). One reciter

and one PA (power amplifier) are needed for each 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 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 sections provide brief descriptions of the base station

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. A module’s position in the subrack is defined by the associated

interconnect board socket, which connects the module to the system

control bus.

Tait TB9300 User Manual

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