User Manual
Table Of Contents
- Document History
- Introduction
- Product Concept
- GSM Application Interface
- GSM/GPRS Operating Modes
- Power Supply
- Power Up / Down Scenarios
- Automatic GPRS Multislot Class Change
- Charging Control of the GSM Part
- Power Saving
- Summary of State Transitions (Except SLEEP Mode)
- RTC Backup for GSM Part of XT55/56
- Serial Interfaces of the XT55/56 GSM Part
- Audio Interfaces
- SIM Interface
- Control Signals
- GPS Application Interface
- GSM and GPS Antenna Interfaces
- Electrical, Reliability and Radio Characteristics
- Mechanics
- Reference Approval
- Example Applications
- List of Parts and Accessories
XT55/56 Hardware Interface Description
Confidential / Preliminary
s
XT55/56_hd_v02.96 Page 23 of 125 18.08.2005
Feature Implementation
FAX Group 3: Class 1, Class 2
SIM interface
Supported SIM card: 3V
External SIM card reader has to be connected via interface connector (note
that card reader is not part of XT55/56)
External antenna
GSM / GPRS:
GPS:
Connected via 50 Ohm antenna connector or antenna pad.
Separate GPS antenna connector. See Figure 49 for details.
Audio interfaces Two analog audio interfaces, one digital audio interface (DAI)
Audio features Speech codec modes:
• Half Rate (ETS 06.20)
• Full Rate (ETS 06.10)
• Enhanced Full Rate (ETS 06.50 / 06.60 / 06.80)
• Adaptive Multi Rate (AMR)
Handsfree operation
• Echo cancellation
• Noise reduction
Two serial GSM
interfaces:
ASC0, ASC1
• 2.65V level, bi-directional bus for AT commands and data
• ASC0 – full-featured 8-wire serial interface. Supports RTS0/CTS0
hardware handshake and software XON/XOFF flow control. Multiplex
ability according to GSM 07.10 Multiplexer Protocol.
• ASC1 - 4-wire serial interface. Supports RTS1/CTS1 hardware
handshake and software XON/XOFF flow control.
• Baud rate: 300bps ... 230kbps on ASC0 and ASC1
• Autobauding (on ASC0 only) detects 1200, 2400, 4800, 9600, 19200,
38400, 57600, 115200, 230400 bps
Two serial GPS
interfaces: SDn1, SDn2
• Baud rate: 4800 … 115200 bps on SD1 and SD2 (default setting on both
interfaces: 9600 bps)
Phonebook
management
Supported phonebook types: SM, FD, LD, MC, RC, ON, ME
SIM Application Toolkit Supports SAT class 3, GSM 11.14 Release 98, support of letter class “c”
Ringing tones Offers a choice of 7 different ringing tones / melodies, easily selectable with
AT command
Real time clock Implemented
Timer function Programmable via AT command
Support of TTY/CTM To benefit from TTY communication via GSM, CTM equipment can be
connected to one of the three audio interfaces.
Physical characteristics Size: 35.0 ± 0.15mm x 53.0 ± 0.15mm x 5.1 ± 0.15mm
Weight: 11g
RoHS, WEEE All hardware components are fully compliant with the EU RoHS and WEEE
Directives
Firmware upgrade XT55/56 firmware upgradable over serial interface
Evaluation kit The DSB45 Support Box is an evaluation kit designed to test and type
approve the GSM part of Siemens cellular engines and provide a sample
configuration for application engineering. See Chapter 10 for details.