User's Manual

HC25 Hardware Interface Overview
1 Introduction
12
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HC25_HO_v00.220 Page 6 of 39 2007-03-20
Confidential / Preliminary
1 Introduction
This document describes the hardware of the Siemens HC25 module that connects to the cel-
lular device application and the air interface. It helps you quickly retrieve interface specifica-
tions, electrical and mechanical details and information on the requirements to be considered
for integrating further components.
1.1 Related Documents
[1] HC25 AT Command Set 00.220
[2] HC25 Release Notes 00.220
1.2 Terms and Abbreviations
Abbreviation Description
ANSI American National Standards Institute
AMR Adaptive Multirate
ARP Antenna Reference Point
B2B Board-to-board connector
BB Baseband
BEP Bit Error Probability
BTS Base Transceiver Station
CB or CBM Cell Broadcast Message
CE Conformité Européene (European Conformity)
CS Coding Scheme
CS Circuit Switched
CSD Circuit Switched Data
DAC Digital-to-Analog Converter
dBm0 Digital level, 3.14dBm0 corresponds to full scale, see ITU G.711, A-law
DCS Digital Cellular System
DL Download
DRX Discontinuous Reception
DSB Development Support Board
DSP Digital Signal Processor
DTMF Dual Tone Multi Frequency
DTX Discontinuous Transmission
EDGE Enhanced Data rates for GSM Evolution
EFR Enhanced Full Rate
EGSM Enhanced GSM