Understanding Mobile Terms - Part 2

in Mobile Help

CCS7
Common Channel Signaling No. 7

CDMA
Code Division Multiple Access; also known as spread spectrum, CDMA cellular systems utilise a single frequency band for all traffic, differentiating the individual transmissions by assigning them unique codes before transmission. There are a number of variants of CDMA (see W-CDMA, B-CDMA, TD-SCDMA et al)

CDMAone
The first commercial CDMA cellular system; deployed in North America and Korea; also known as IS-95

CDMA2000
A member of the IMT-2000 3G family; backwardly compatible with cdmaOne

CDMA 1X
The first generation of cdma2000; the standardisation process indicated that there would be CDMA 2X and CDMA 3X but this no longer appears likely

CDMA 1X EV-DO
A variant of CDMA 1X which delivers data only

CDPD
Cellular Digital Packet Data; a packet switched data service largely deployed in the USA. The service uses idle analogue channels to carry the packetised information.

CDPSK
Coherent Differential Phase Shift Keying

CDR
Call Detail Records; the record made within the cellular network of all details of both incoming and outgoing calls made by subscribers, The CDR is passed to the billing system for action

Cell
The area covered by a cellular base station. A cell site may sectorise its antennas to service several cells from one location cell site
The facility housing the transmitters/receivers, the antennas and associated equipment

Cell splitting
The process of converting a single cell to multiple cells by sectorising the antennas in the cell site or constructing additional cells within a cell site

CELP
Code Excited Linear Prediction; an analogue to digital voice coding scheme, there are a number of variants used in cellular systems

CEPT
Conference of European Posts and Telecommunications. A organisation of national posts, telegraphs and telephone administrations. Until 1988, when this work was taken over by ETSI, the main European body for telecommunications standardisation. CEPT established the original GSM standardisation group

CF
Call Forwarding

CI
Carrier to Interference ratio

CIBER
Cellular Intercarrier Billing Exchange Roamer Record

CID
Caller Identification

Circuit switching
A method used in telecommunications where a temporary dedicated circuit of constant bandwidth is established between two distant endpoints in a network. Mainly used for voice traffic; the opposite of packet switching

CLID
Calling Line Identification

CLIP
Calling Line Identification Presentation

CLIR
Calling Line Identification Restriction

CM
Connection Management; is used to set up, maintain and take down call connections

CMOS
Complementary Metal Oxide Substrate

Codec
A word formed by combining coder and decoder the codec is a device which encodes and decodes signals. The voice codec in a cellular network converts voice signals into and back from bit strings. In GSM networks, in addition to the standard voice codec, it is possible to implement Half Rate (HR) codecs and Enhanced Full Rate (EFR) codecs

Control signal
A signal sent to a cellular phone from a base station or vice versa which carries information essential to the call but not including the audio portion of a conversation

CPE
Customer Premises Equipment; all the equipment on the end user’s side of the network interface

CPU
Central Processing Unit

CRC
Cyclic Redundancy Check

CRM
Customer Relationship Management

CSS
Customer Support System

CT
Cordless Telephony

CT0
Zero generation cordless telephony; the earliest domestic cordless phones which used analogue technology and which had severe limitations in terms of range and security

CT1
First generation cordless telephony; Improved analogue phones with greater range and security; a number of European nations produced CT1 standards

CT2
Second generation cordless telephony; Using digital technology CT2 phones offered greater range, improved security and a wide range of new functionalities. Used in both domestic and cordless PABX deployments, CT2 was standardised as an interim ETS but was overwhelmed by DECT

CT2-CAI
Second generation cordless telephony-common air interface

CTA
Cordless Terminal Adaptor; a DECT term

CTM
Cordless Terminal Mobility

CTR
Common Technical Regulation; part of the ETSI standardisation process

CUG
Closed User Group
D/A
Digital to Analogue conversion

DAC
Digital to Analogue Convertor

DAMA
Demand Assigned Multiple Access

D-AMPS
Digital AMPS, a US wireless standard also known as IS-136

DAN
DECT Access Node

DCA
Dynamic Channel Assignment

DCCH
Dedicated Control Channels; responsible for roaming, handovers, encryption etc. (See SDCCH, SACCH and FACCH)

DCE
Data Communications Equipment

DCH
Data Clearing House

DCPSK
Differentially Coherent Phase Shift Keying

DCS1800
Digital Cellular System at 1800MHz, now known as GSM1800

DECT
Digitally Enhanced Cordless Telecommunications system, a second generation digital cordless technology standardised by ETSI

DEPSK
Differential Encoded Phase Shift Keying

DES
Digital Encryption Standard

DFSK
Double Frequency Shift Keying

Digital
a method of representing information as numbers with discrete values; usually expressed as a sequence of bits

DPCM
Differential Pulse Code Modulation

DPSK
Digital Phase Shift Keying

DQPSK
Digital Quadrature Phase Shift Keying

DS-CDMA
Direct Sequence CDMA