2: Introduction
Configuring a GSM (3G) modem on a GW2040 Series Router
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Issue: 1.5
Page 6 of 34
Figure 2: A primary link using the 3G modem on the GW2040 series router
2.3
Types of data bearers that the GSM (3G) modem supports
Data bearers are frame protocols that transport data streams. The GSM (3G) modem
supports GPRS, HSDPA, and CSD.
2.3.1
GPRS
GPRS (General Packet Radio Service) uses packet-switched technology to transmit small
bursts of data. The maximum data rate available to the 3G modem depends on
provisioning by the network operator.
2.3.2
HSDPA
HSDPA (High-Speed Downlink Packet Access) uses circuit-switched technology to
transmit data at speeds of up to 7.2Mbps.
2.3.3
HSUPA
HSUPA (High-Speed Uplink Packet Access) is a 3G mobile telephony protocol with up link
speeds of 5.76Mbps.
2.3.4
UMTS
UMTS (Universal Mobile Telecommunications System) is a 3rd generation technology
providing higher transfer rates.
2.3.5
Edge
Edge uses the same frequencies as GPRS but offers better speeds. It is used when the
signal strength for 3G is not sufficient.
