3. TECHNICAL BRIEF 3. TECHNICAL BRIEF 3.1 General Description The U370 supports UMTS-2100, GSM-900, DCS-1800, and PCS-1900 based GSM/GPRS/UMTS. All receivers and the UMTS transmitter use the radioOne Zero-IF architecture to eliminate intermediate frequencies, directly converting signals between RF and baseband. The quad-band GSM transmitters use a baseband-to-IF upconversion followed by an offset phase-locked loop that translates the GMSK- modulated signal to RF.
3. TECHNICAL BRIEF A generic, high-level functional block diagram of U370 is shown in Figure 1-1. One antenna collects base station forward link signals and radiates handset reverse link signals. The antenna connects with receive and transmit paths through a FEM(Front End Module).
DCS and PCS). The antenna switch module allows multiple operating bands and modes to share the same antenna. In U370, a common antenna connects to one of six paths: 1) UMTS-2100 Rx/Tx, 2) GSM-900 Rx, 3) GSM-900 Tx, 4) DCS-1800 Rx, and 5) DCS-1800 Tx, PCS- 1900 Tx(High Band Tx’s share the same path), 6) PCS-1900 Rx.
4. TROUBLE SHOOTING 4.10 USB Troubleshooting USB Initial sequence of U370 is : USB connected to U370 power on → USB_VBUS(Q300) go to 5V → USB_D+ go to 3.3V → USB_DAT is triggered → USB work. Start Power on was OK ?
LGMDP supports Windows 2000/XP where the LG (Ver 4.6 or later) USB modem driver is installed. Additionally, LGMDP allows multi downloading up to 9 handsets at the same time.