User Guide

RH-21 Company Confidential
System Module Nokia Customer Care
Page 38  2004 Nokia Corporation. Issue 2 07/2004
The MCU software enters automatically to local or test mode at start-up if correspond
ing resistors are connected.
Note! Baseband doesn't wake up automatically when the battery voltage is connected (normal mode).
Power can be switched on by
• Pressing the power key
• Connecting a charger
• RC-alarm function
In the local and test mode, the baseband can be controlled through MBUS or FBUS
(FBUS is recommended) connections by Phoenix service software.
RF Module
Requirements
The RH-21 RF module supports the following system:
TDMA800
Hence, the minimum transceiver performance requirements are described in TIA/EIA-
136-270. The RH-21 RF must follow the requirements in revision A. EMC requirements
are set by FCC 47CFR 15.107 (conducted emissions), 15.109 (radiated emissions, idle
mode), and 22.917 (radiated emissions, call mode) [1].
Temperature Conditions
Temperature range:
ambient temperature: -30...+ 60 °C
PWB temperature: -30...+85 °C
storage temperature range: -40 to + 85 °C
All of the EIA/TIA-136-270A requirements are not exactly specified over temperature
range. For example, RX sensitivity requirement is 3 dB lower over –30..+60 °C range.
Test > 1 k 560_(<1k_) Recommended with baseband testing.
Same as local mode, but it is possible
to make a phone call.
Mode BSI- resistor BTEMP- resistor Remarks