| 单词 | GSM (Global System for Mobile Communications née Groupe Spéciale Mobile) |
| 释义 | GSM (Global System for Mobile Communications née Groupe Spéciale Mobile) GSM offers additional security in the form of a subscriber identification module (SIM) that plugs into a card slot in the handset. The SIM contains user-profile data, a description of access privileges and features, and identification of the cellular carrier that hosts the home registry.The SIM can be used with any GSM set, thereby providing complete mobility across nations and carriers supporting GSM, assuming that cross-billing relationships are in place. GSM is predominant in Europe, Africa, and much of Asia. GSM is the basis for DCS 1800, also known as Personal Communications Network (PCN), in Europe. DCS 1800, in large part, is an upbanded version of GSM, operating in the 1800 MHz (1.8 GHz) range. Also with minor modifications, it is the basis for PCS 1900 in the United States, where it also is known as GSM. PCS 1900 is the ANSI standard (J-STD-007, 1995) for PCS at 1900 MHz (1.9 GHz). See also band, carrier, CDMA, cellular radio, CEPT, channel, digital, downlink, encode, encryption, FDD, FEC, frequency, frequency hopping spread spectrum, GMSK, ISDN, PCS, RPELPC, signaling rate, SIM, TDMA, time slot, throughput, transmission rate, uplink, and VSELP. |
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