User manual

Features
36
Mobile/Cellular protocols
Protocols supported in the Digi Cellular Family include, unless otherwise noted:
 Global System for Mobile communication (GSM)
 Code-Division Multiple Access (CDMA)
 General Packet Radio Service (GPRS)
 Enhanced Data Rates for GSM Evolution (EDGE)
 Universal Mobile Telecommunications Service (UMTS) (ConnectPort WAN
VPN only)
 Evolution-Data Optimized (EV-DO, EVDO, or 1xEV-DO) (ConnectPort WAN
VPN only)
Global System for Mobile communication (GSM)
The GSM protocol is a digital mobile telephone system used in Europe and other parts of
the world. There are three major types of digital mobile systems and GSM is the most
widely used. GSM compresses and digitizes data and sends it down a channel along with
two other streams of user data - each in its own time slot.
Code-Division Multiple Access (CDMA)
CDMA is a form of multiplexing, which allows numerous signals to occupy a single
transmission channel, optimizing the use of available bandwidth. The technology is used
in ultra-high-frequency (UHF) cellular telephone systems in the 800-MHz and 1.9-GHZ
bands and through an analog-to digital conversion enhances privacy and makes cloning
difficult.