User's Guide

DRAFT
Overview 1
Overview
EM400 Communications Summary
Your EM400 keeps you in touch, enabling you to use the best available mobile service wherever you
are. It supports tri-band UMTS and quad-band GSM:
Your EM400 supports SMS text messaging and the following communications services:
Where UMTS service with HSDPA is available, your EM400 can connect at speeds up to 7.2Mb/s.
Your EM400 provides automatic fallback to UMTS where HSPA is not available and to EDGE or
GPRS service where UMTS is not available (network support required). This section describes the
services that the EM400 supports:
• High Speed Packet Access (HSPA)
HSPA is an enhancement to UMTS networks. HSDPA (High Speed Downlink Packet
Access) enables the downlink speed to be dramatically increased; up to 7.2Mbps using the
EM400. File downloads will be faster, whilst applications such as video streaming may
operate at higher quality and greater reliability. The maximum speed available depends on
the configuration of the mobile network and local conditions such as distance to the base sta-
tion. HSUPA (High Speed Uplink Packet Access) enables the EM400 to upload data at
speeds up to 2.0Mbps.
• Universal Mobile Telecommunications System (UMTS)
UMTS is a 3G technology standard for wide-area wireless data communication that is based
on the GSM standard. The UMTS standard uses advanced network operator mobile Internet
services to achieve data transfer rates up to 384kbps, which are ideal for media streaming,
video MMS, instant shopping, and banking.
• Enhanced Data Rates for Global Evolution (EDGE)
EDGE enhances GPRS by increasing data throughput over GPRS by as much as three times,
depending upon the network radio signal strength and quality. GPRS networks that are
enhanced with EDGE are often referred to as Enhanced GPRS (E-GPRS) networks.
EDGE provides the “always on” capability of GPRS but at faster speeds. EDGE technology
is transparent — simply make a GPRS connection as usual and benefit from the increase in
GSM
GPRS
EDGE
850MHz
900MHz
1800MHz
1900MHZ
UMTS
HSDPA
850MHz
1900MHz
2100MHz
Service Maximum Download Speed Maximum Upload Speed
HSPA 7.2Mb/s 2.0Mb/s
UMTS 384kb/s 384kb/s
EDGE 247.4kb/s 123.7kb/s
GPRS 53.6kb/s (CS-2)
85.6kb/s (CS-4)
26.8kb/s (CS-2)
42.8kb/s (CS-4)