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Seven months before the explosions, Hezbollah's secretary-general Hassan Nasrallah instructed the group's members to use pagers instead of cell phones, claiming Israel had infiltrated their cell phone network. [24] [25] Hezbollah then purchased Gold Apollo AR-924 pagers [26] [27] [28] about five months before the explosions. [29]
Bell Laboratories Layer Space-Time (BLAST) is a transceiver architecture for offering spatial multiplexing over multiple-antenna wireless communication systems. Such systems have multiple antennas at both the transmitter and the receiver in an effort to exploit the many different paths between the two in a highly-scattering wireless environment.
The monopoly position of the Bell System in the U.S. was ended on January 8, 1982. AT&T Corporation proposed by in a consent decree to relinquish control of the Bell Operating Companies, which had provided local telephone service in the United States. [1]
Voice broadcast systems manage a database of phone lists as well as digitally recorded phone messages. Using telephony components, these computers can simultaneously broadcast thousands of phone messages. Personalized information can be included in the phone messages through the integration of text-to-speech software.
The Stingray acts as a cellular tower to send out signals to get the specific device to connect to it. Cell phones are programmed to connect with the cellular tower offering the best signal. When the phone and Stingray connect, the computer system determines the strength of the signal and thus the distance to the device.
Many base stations were shielded from EMP blasts, and the system was designed with automatic routing which would automatically avoid towers that were knocked out in an attack or other outage. One famous example of a hardened AT&T Long Lines site is 33 Thomas Street in Manhattan, it was designed to withstand a nuclear blast and has no windows.