ProSoft Technology RLXIC-EH, Руководство пользователя

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RLXIC-EH ♦ Intelligent Cellular Introduction to the RLXIC-EH
RadioLinx Intelligent Cellular Ethernet Gateway for HSUPA (3G GSM) Networks User Manual
Page 12 of 111
ProSoft Technology, Inc.
May 29, 2009
HSPDA (and HSUPA) falls back to UMTS, EDGE or GPRS (in order of
precedence). This feature allows you to have seamless connectivity no matter
where your RLXIC-EH 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 RLXIC-EH 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.