User Manual

Glossary
4Motion 913 System Manual
CDMA Code Division Multiple Access is a second generation (2G) cellular technology
defined by Qualcomm in IS-95 and IS-2000. A coding scheme, used as a modulation
technique, in which multiple channels are independently coded for transmission over
a single wideband channel. In some communication systems, CDMA is used as an
access method that permits carriers from different stations to use the same
transmission equipment by using a wider bandwidth than the individual carriers. On
reception, each carrier can be distinguished from the others by means of a specific
modulation code, thereby allowing for the reception of signals that were originally
overlapping in frequency and time. Thus, several transmissions can occur
simultaneously within the same bandwidth, with the mutual interference reduced by
the degree of orthogonality of the unique codes used in each transmission.
CE The CE-marking is a European Union regulatory community sign. It symbolizes the
compliance of the product with all essential requirements relating to safety, public
health, consumer protection.
CINR Carrier-to-Interference plus Noise Ratio (expressed in dB)
CIR Committed Information Rate. The rate (in bits per second) at which a network
guarantees to transfer information under normal conditions, averaged over a
minimum increment of time.
CLI Command Line Interface. A user interface that accepts typed commands to instruct
the managed device on the task to perform.
cPCI Compact Peripheral Component Interface. a standard for computer backplane
architecture and peripheral integration, defined and developed by the peripheral
component interconnect (PCI) industrial computers manufacturers group (PICMG).
Designed to provide rugged, high-density systems.
CPU Central Processing Unit.
CQI Channel Quality Information
CS Convergence Sublayer. Particular protocols that are responsible for gathering and
formatting higher layer information so it can be processed by the lower layers.
CSMA/CD Carrier Sense Multiple Access with Collision Detection. Media-access mechanisms
wherein devices ready to transmit data first check the channel for a carrier. If no
carrier is sensed for a specific period of time, a device can transmit. If two devices
transmit at once, a collision occurs and is detected by all colliding devices. This
collision subsequently delays retransmissions from those devices for some random
length of time. Ethernet and IEEE 802.3 use CSMA/CD access.
CSN Connectivity Service Network. A CSN is defined as a set of network functions that
provide IP connectivity services to WiMAX subscribers and all the IP core network
functions. A CSN is comprised of network elements such as routers, proxy/servers,
user databases, and inter-working gateway devices.
CTC Convolutional Turbo Code is a type of turbo codes with some of the convolutional
schemes used. For its high-performance error correction nature, CTC is the iterative
decoding scheme of choice as evidenced by their wide adoption in standards bodies.
DCD Downlink Channel Descriptor.