Idle
Channel - A channel that is assigned to a base station use but is not
currently in service (being used). All idle channels for each base station
are kept in a 'idle-link-list' which is constantly updated at the MTSO. IEEE802.11 - A
WLAN standard (or set of standard), operating at 2.4 GHz and with data rates
of up to 1 Mbps IF - Intermediate
Frequency. Refers to the resulting signal in a superhet receiver after the
incoming carrier is mixed with the oscillator signal. Image Rejection
- A measure of the ability of the receiver to reject RF signals present on
the image frequency of the receiver. Image rejection is one of the purposes
of front-end filtering in a superhet receiver. IM Rejection -
A measure of the ability of the receiver to reject signals which are capable
of producing IM products. Infrastructure
- All parts of the cellular system, excluding the subscriber. Includes the
MTSO, Base Stations, Cell Sites, and all links between them. In-Band Signaling -
A process in which audio tones between 300 and 3400 Hz provide supervisory
and/or address signaling. Interface - A common
boundary between two or more systems, integrated circuits, or pieces of equipment
that ensures a proper connection between them. Intermodulation
- Also referred to as "IM." The mixing of two or more signals, producing
sums, differences and harmonic multiples. IM generally occurs in the gain
amplifier ahead of the mixer stage within a receiver, but also occurs in any
non-linear device. IS-3 - The original
analog cellular standard, now replaced by ANSI standard EIA/TIA-553 and TIA
interim standard IS-91. IS-41 - The protocol
for 'roaming' within the USA, describing how services should 'hand over' between
operators IS-54 - The TDMA
standard for U.S. digital cellular. A digital cellular system that squeezes
three conversations into one cellular channel. IS-88 - Narrowband
Analog Cellular system developed by Motorola that squeezes three conversations
into one cellular channel using analog frequency division multiplexing. First
standardized in TIA interim standard IS-88, and now incorporated in IS-91.
IS-91 - Analog
Cellular and PCS. The TIA version of the analog cellular standard, incorporating
the functionality of IS-88 (narrowband analog) and IS-94 as well as PCS band
operation. IS-94 - Inbuilding
Cellular. A standard for inbuilding operation of analog cellular systems using
extremely low power. Now incorporated in IS-91. IS-95 - The CDMA
(Qualcomm) standard for U.S. digital cellular. A digital cellular system that
squeezes between 10 and 20 conversations into one cellular channel by combining
30 KHz cellular channels into a single 1.25 MHz channel and using code division
multiplexing to combine and recover the individual conversations. IS-136 - TIA standard
that provides dual mode (analog and digital) cellular services using the TDMA
technology. An enhancement to IS-54 TDMA, that includes a more advanced control
channel (known as the digital control channel (DCCH), to distinguish it from
the 'analog' control channel, which although less sophisticated, is still
digital!). IS-634 - TIA standard
for 800 MHz cellular base-station to switch interface. Supports CDMA. IS-651 - TIA standard
for an open interface between the PCS switching center and the radio base-station
subsystem in a PCS network. Supports both GSM and CDMA. ISM Band - Industry,
Scientific and Medical Band. Unlicensed 902 - 928 MHz, 2.4 - 2.4835 GHz and
5.725 - 5.850 GHz bands, RF power up to 1 watt. Frequency hopping or direct
sequence transmission allowed. Isotropic Radiator
- A completely non-directional antenna (one which radiates equally well in
all directions.) This antenna exists only as a mathematical concept and is
used as a known reference to measure antenna gain. ITS - Intelligent
Transportation Systems. IVHS - Intelligent
Vehicle Highway Systems.
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