User's Manual

5
RAM
Random Access memory. Data in RAM can be accessed in random order, and
quickly written and read.
RF
Radio Frequency.
RTC
Real Time Clock.
TDMA
Time division multiple access (TDMA) is digital transmission technology that allows a
number of users to access a single radio-frequency (RF) channel without interference
by allocating unique time slots to each user within each channel. The TDMA digital
transmission scheme multiplexes three signals over a single channel. The current
TDMA standard for cellular divides a single channel into six time slots, with each
signal using two slots, providing a 3 to 1 gain in capacity over advanced mobile-
phone service (AMPS). Each caller is assigned a specific time slot for transmission.
USB
Universal Serial Bus. Type of serial bus that allows peripheral devices (disks,
modems, printers, digitizers, data gloves, etc.) to be easily connected to a computer.
A “plug-and-play” interface, it allows a device to be added without an adapter card
and without rebooting the computer (the latter is known as hot-plugging). The USB
standard, developed by several major computer and telecommunications companies,
supports data-transfer speeds up to 12 megabits per second, multiple data streams,
and up to 127 peripherals.
WWAN
Stands for "Wide Area Network." It is similar to a Local Area Network (LAN), but it is
not limited to a single location and it uses Mobile telecommunication cellular network
technologies such as UMTS, GPRS, CDMA2000, GSM, CDPD, Mobitex, HSDPA or
3G to transfer data. WWAN connectivity allows a user with a laptop and a WWAN
card to surf the web, check email, or connect to a Virtual Private Network (VPN) from
anywhere within the regional boundaries of cellular service.
WPAN
A Wireless Personal Area Network is a personal area network - a network for
interconnecting devices centered around an individual person's workspace - in which
the connections are wireless. Typically, a wireless personal area network uses some