Base Station Antenna Systems 2008 Product Selection Guide - AVW

Teletilt ® Remote Electrical Downtilt SystemRET System With Smart Bias TeesInstead of a home run control cable up the height of a tower or building, the AISG signals can beinjected (piggy-backed) into the existing RF cable by using smart bias tees. For this to be done, asmart bias tee is installed at the bottom of the antenna line devices and modulates the AISG signalsinto the RF cable.There are two options that can be used for dividing out the AISG signal from the RF cable intocontrol cables leading to the antenna line devices at the top of the site. One option is to use asecond smart bias tee at the top. The AISG port on that smart bias tee can be connected to ajunction box, actuator, or any other RET device. A second option is to use an AISG tower mountedamplifier (TMA), which also has an AISG port for connecting to any RET devices.RET System Using AISG Port on ATC300-1000 with Either Smart Bias Tees oran AISG TMA at the TopSmart Bias TeeOptionTMAOptionAntennaSmart Bias TeeAISGTMAActuatorAISGControlCableAISGUSBCoaxialCable~ ~ ~ ~ ~ATC200-LITE-USBPortable ControllerorATC300-1000ControllerLightningProtection UnitCrossoverEthernetCableorNetworkAISG ConnectorBTS(Computer interface not supplied.)78Andrew Wireless Solutions www.andrew.com