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G.711 (network protocol), 527
G.723 (network protocol), 527
G.723.1 (network protocol), 545
Gatekeeper, 526
Gateway GPRS support node, 511
Gateway, 362, 526
Gaussian frequency shift keying, 590
General packet radio service, 511
Generic communication system, 16
GFSK, 590
GGSN, 511
Global positioning system, 483
Global system for mobile communications, 457, 463–465
Globalstar, 478
GPRS, 511
GPS, 483
Ground segment (of satellite communication), 171
GSM, 457, 463–465
architecture, 464
services, 465
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