User Guide

NHM-8NX
System Module & UI PAMS Technical Documentation
Page 60 ãNokia Corporation Issue 1 05/02
Mechanical shielding
NHM-8NX has metal shield over RF parts and BB parts to provide immunity for internal
radiation and immunity for external fields. SIM card connector is placed below the bat-
tery to provide maximum immunity, to the SIM card, against RF fields from the antenna.
Security
The phone flash program and IMEI code are software protected, using an external secu-
rity device that is connected between the phone and a PC. The security device uses IMEI
number (IMEI is stored in UEM non-volatile memory cells), the software version number
and a 24bit hardware random serial number that is read from the UPP, and calculates a
flash authority identification number, that is stored into the phone (emulated) EEPROM.
For further information see ].
Test Interfaces
Through MBUS or FBUS connections, the phone HW can be tested by PC software (Phoe-
nix) and production equipment (FLALI/FINUI/LABEL).
Production / After Sales Interface
Test pads are placed on engine PWB, for service and production purposes, same test pat-
tern is used for after sales purposes as well:
Figure 23: Production/Test/After sales interface
GENTEST0
(DAI Clock)
MBUS
FBUSTX
VPP
GND
FBUSRX