User guide

Introduction to the GX400
Rev 1.0 Jun.11 15
Communication
Many of the GSM Networks have been expanded to HSPA+.
HSPA+
HSPA+ (High-Speed Packet Access +) is an enhanced version of HSPA cellular
technology defined by the 3rd Generation Partnership Project (3GPP) Release 7
UMTS specification for Mobile Terminated Equipment. Using improved
modulation schemes and refined data communications protocols, HSPA+ permits
increased data rates. Theoretical speeds are 5.76 Mbits/s uplink and 21.1 Mbits/s
downlink.
HSPA (High-Speed Packet Access) is a cellular technology which most closely
resembles a broadband synchronous connection. The upload and download
speeds are maximized to provide a faster throughput, reaching speeds up to 2.0
Mbit/s for the uplink and 7.2 Mbit/s for the downlink.
HSPA+ falls back to HSPA, UMTS, EDGE, or GPRS (in order of precedence).
This feature allows you to have seamless connectivity no matter where your
GX400 is.
UMTS
UMTS (Universal Mobile Telecommunications System) supports up to 1920 kbit/s
data transfer rates, although most users can expect performance up to 384 kbit/s.
A UMTS network uses a pair of 5 MHz channels, one in the 1900 MHz range for
uplink and one in the 2100 MHz range for downlink.
EDGE
EDGE (Enhanced Data rates for GSM Evolution) provides end-to-end packet data
services with an enhanced connectivity building on GPRS technology and using
the established GSM networks. EDGE provides higher transmission rates and
better transmission quality for data than GPRS. EDGE can carry data at speeds
typically up to 384 kbit/s in packet mode.
When EDGE is not available, your GX400 will fall-back to GPRS for the
connection to your cellular provider to provide continued connectivity.
GPRS
General Packet Radio Service (GPRS) is packet-switched with many users
sharing the same transmission channel, but only transmitting when they have
data to send. This means that the total available bandwidth can be immediately
dedicated to those users who are actually sending at any given moment,
providing higher utilization where users only send or receive data intermittently.
GPRS provides speeds of 30–70 kbps with bursts up to 170 kbps.