1-2 • Introduction 8018653 1.1
The GMH 2000 system supports the following cellular industry
standards:
• Electronic Industry Association (EIA)/Telecommunications Indus-
try Association (TIA) Interim Standard-54 (IS-54). IS-54 Analog is
the analog standard for mobile telecommunications, it provides
one voice circuit per single RF channel.
• EIA/TIA IS-54. IS-54 Digital is the digital standard for
telecommunications; it provides up to three time-division multiple-
access (TDMA) voice circuits per RF channel.
• Extended-TDMA (E-TDMA™). Developed by HNS, E-TDMA
provides 10 to 15 voice circuits per RF channel.
As shown in figure 1-1, the GMH 2000 cellular system architecture
contains the following subsystems:
•Mobile switching center (MSC)
•Operations and maintenance center (OMC)
•Base station controller (BSC)
•Base transceiver station (BTS)
•Mobile station (MS)/fixed stations (MultiSubscriber Units, or
MSUs)
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