N-GEN Communications Web-based Seminars ©NGCS

Seminar - An Overview of Communications Technologies

Module 9 - Wireless Systems and Technologies                                                                                 Slide 23 of 80                                                                                                    ________________

Second -Generation (2G) Wireless Communications Systems

                                    Digital Advanced Mobile Phone System (D-AMPS) 

                                    U.S. digital Cellular

                                    Global System for Mobile (GSM)

                                    Personal Communications System (PCS)

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2G wireless mobile systems were introduced in the late 1980s. These systems were intended primarily for voice transmission. 2G systems use digital encoding and support high bit rate voice and limited data communications. 2G systems also offer data, fax and short message service.

Digital Advanced Mobile Phone System (D-AMPS) - is an extension of AMPS using both digital and analogue speech transmission (standard IS-54) or purely digital transmission (standard IS-136).

U.S. Digital Cellular (USDC) System - Introduced in North America in 1991.

U.S. Narrowband Spread Spectrum - Introduced in North America in 1993.

GSM - Most widely used digital phone system in Europe. First introduced in 1990. GSM supports voice, data, text messaging and cross-border roaming.

PCS - PCS is a North American mobile phone service emphasizing personal communication.