Power Supply And Power Management Sub-System - Huawei ETS2000 Series Maintenance Manual

Signal
VREG_PHONE
RUIM_RST
RUIM _CLK
RUIM _DAT
RUIM _EN
VDD_ SIM of ETS2000 series FWT is powered by the power management chip on
the TCPC board. R-UIM_EN directly provides power for the UIM card. See Figure
1-14.
Figure1-14

1.3.2 Power Supply and Power Management Sub-System

1. DC/DC power Module
The external power over voltage protection module protects the input power. When
the input voltage exceeds 30V, the protection circuit will function. Then the silicon
controlled thyristor is in the continuity status and the self-healing fuse F301 will be
blown. Thus, the power protection circuit will be cut (The function is only to be
fulfilled on the Indian BSNL FWT). The circuit is shown in Figure 1-16.
figure1-18R_UIM card interface module signals
Source or target module
Inter-board interface
module
Inter-board interface
module
Inter-board interface
module
Inter-board interface
module
Inter-board interface
module
ETS2000 series FWT VDD_SIM power supply
14
Function
UIM card power supply
UIM card resetting signal
UIM card clock signal
UIM bi-directional data signal
UIM enabling signal