Specifications

XT55 Hardware Interface Description
Confidential / Preliminary
s
mo b i l e
XT55_hd_v00.02 Page 19 of 116 17.03.2004
2.1 XT55 key features at a glance
Table 1: XT55 key features
Feature Implementation
Power supply Supply voltage 3.3V – 4.8V for the GSM / GPRS module
Separate power supply source: 3.3V ± 5% for the GPS device
Power saving (GSM) Minimizes power consumption in SLEEP mode to 3mA
Power saving (GPS) TricklePower™ mode reduces power to < 60mW
Charging Supports charging control for Li-Ion battery for the GSM/GPRS part of the
module
Frequency bands
· Tri-band: EGSM 900, GSM 1800, GSM 1900
· Compliant to GSM Phase 2/2+
GSM class Small MS
Transmit power
· Class 4 (2W) at EGSM900
· Class 1 (1W) at GSM1800 and GSM 1900
GPRS connectivity
· GPRS multi-slot class 10
· GPRS mobile station class B
GPS features
· GPS receiver with SiRFstar Ile/LP chip set
· Processor type ARM7/TDMI
· Sirf GSW2, version 2.2.0
Temperature range
Temperature control
and auto switch-off
· Normal operation: -20°C to +55°C
· Restricted operation: -25°C to -20°C and +55°C to +70°C
· Constant temperature control prevents damage to XT55 when the
specified temperature is exceeded. When an emergency call is in
progress the automatic temperature shutdown functionality is
deactivated.
DATA GPRS:
CSD:
WAP:
· GPRS data downlink transfer: max. 85.6 kbps (see Table 2)
· GPRS data uplink transfer: max. 42.8 kbps (see Table 2
· Coding scheme: CS-1, CS-2, CS-3 and CS-4
· XT55 supports the two protocols PAP (Password Authentication
Protocol) and CHAP (Challenge Handshake Authentication Protocol)
commonly used for PPP connections.
· Support of Packet Switched Broadcast Control Channel (PBCCH) allows
you to benefit from enhanced GPRS performance when offered by the
network operators.
· CSD transmission rates: 2.4, 4.8, 9.6, 14.4 kbps, non-transparent, V.110
· Unstructured Supplementary Services Data (USSD) support
· WAP compliant
SMS
· MT, MO, CB, Text and PDU mode
· SMS storage: SIM card plus 25 SMS locations in the mobile equipment
· Transmission of SMS alternatively over CSD or GPRS. Preferred mode
can be user-defined.
MMS MMS compliant