TB9300 Installation and Operation Manual Description 13© Tait Limited March 20161.2 ModulesThe base station consists of a subrack with up to two physical transmit/receive channels.The single PMU (power management unit) supplies and manages power tothe whole subrack (refer to “Theory of Operation” on page 22). One reciterand one PA (power amplifier) are needed for each physical transmit/receivechannel. There is also a front panel with user controls and fans. Themodules are interconnected at the front of the subrack. Externalconnections to the modules are located at the rear.Modules come in different variants depending, for example, on the RFband or the supply voltage.Each module is inserted into the 4U subrack from the front and is securedat the front with a metal clamp. Both clamp and module are easily removedfor rapid module replacement. The modules are secured laterally withplastic guides that clip into the top and bottom of the subrack. These guidescan be easily repositioned to change the configuration of a subrack. Theheavier modules are also secured laterally by metal tabs at the rear of thesubrack.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 astandard 19 inch rack or cabinet. The subrack is fitted with an interconnectboard that connects the system control bus and power to the modules andfront panel. The position of a module in the subrack is defined by the socketon the subrack interconnect board to which the module is connected by thesystem control bus.
