Issue 2 06/2005 COMPANY CONFIDENTIAL 35Copyright © 2005 Nokia. All Rights Reserved.RH-53/54Nokia Customer CareReceiver Troubleshooting■ Front End Module (FEM) control signalsDepending on the vendor of the Front End Module (FEM), different timing of the control signalsare present. The SW suppoerts both FEMs. R629 tells the SW which FEM control should beactive. Renesas FEM control is used when R629 is 18K and RFMD FEM control is used whenR629 is 82K.If the FEM is exchanged with an other type, the R629 must be changed, too.Renesa FEM logicTable 5: Renesa FEM logicRFMD FEM logicTable 6: RFMD FEM logicMode Vtx BS VC1 VC2VTX_B_P VTX_B_P Vant1 Vant2Low Band RX 0 0 0 0Low Band TX 1 0 1 0High Band RX 0 1 0 0High Band TX 1 1 0 1Vtx BS VC1 VC2Mode VTX_B_P VTX_B_P Vant1 Vant2Idle 0 0 0 0Low Band RX 0 0 1 0Low Band TX 1 0 1 0High Band RX 0 1 1 0High Band TX 1 1 1 0
