Specifications

Chapter 21 – CDMA Terminology and Acronyms
Multi-Tech Systems, Inc. CDMA C1 AT Commands Reference Guide 123
IS-95 IS-95 is the first CDMA standard published by Qualcomm in 1993. It is a TIA standard for
North American cellular systems based on CDMA. It is widely deployed in North America and
Asia.
IS-95A IS-95A is a CDMA standard with improved voice quality. IS-95A defines what generally is
known as cdmaOne, which supports voice and 14.4 Kbps data rates. This standard is widely
used throughout the world.
IS-95B CDMA standard contains Medium Data Rate capabilities and bug fixes for system access
failures. It is considered a 2.5G system. It supports data rates up to 115 Kbps.
IS-2000 The first 3G CDMA standard based on IS-95B. It contains a significant increase in voice
capacity and high-speed data rates. It is backward compatible with IS-95B and IS-95A.
IS-707 TIA/EIA/IS-707 describes data services available on wideband spread spectrum systems. It is
organized into a series of related recommendations, some of which address functions
common to all CDMA data services and others that describe a specific data service.
IWF Interworking Function. A process that acts as a gateway or interface between two or more
communication components. For example, an IWF is used to interface wireless CDMA
networks and wire line PSTN or packet-data networks.
LAPM Link Access Procedure for Modems. An error control protocol defined in the ITU-T
recommendations V.42. Like the MNP protocols, LAPM uses cyclic redundancy checking
(CRC) and retransmission of corrupted data (ARQ) to ensure data reliability.
MCC Mobile Country Code is a pre-defined 3-digit number that represents a country in the IMSI.
MDN MDN stands for the 10 digit Mobile Data Number or the mobile phone number.
MIN MIN stands for the 10 digit Mobile Identification Number or mobile user account number.
The first three digits also known as MIN2. Last seven digits also known as MIN1
MNC MNC stands for Mobile Network Code, a pre-defined 2-digital number that represents a sub-
network in the IMSI (usually set to “00”).
MO Mobile Originated, an action (usually a call) that is first started from the phone. An outgoing
call or SMS.
MS Mobile Station. The term MS is commonly used to represent the phone or mobile.
MT MT stands for Mobile Terminated. MT is an action, usually a call that is first started from a
land based network. An incoming call or SMS.
MSM MSM stands for Mobile Station Modem.
NAM NAM stands for Number Assignment Modem. The NAM is collection of internal parameters
that define a working phone for a given network (phone number, access parameters, etc.).
NID NID stands for Network ID. The NID is an identification number that represents geographic
location of a common coverage area; but is a subset of the SID, usually a neighborhood in a
large city. Also see SID.
NVRAM NVRAM stands for Non-Volatile Random Access Memory. NVRAM is a data storage device
that does not lose its data when power is turned off.
OTAPA Over The Air Parameter Administration. It is an automatic update in internal software
parameters (PRL for example) by means of a specially defined CDMA data call that is mobile
terminated (MT).
OTASP Over The Air Service Programming. It is an automatic update in internal software
parameters PRL; for example, PRL by means of a specially defined CDMA data call that is
mobile terminated (MT).
OTKSL One-Time Keypad Subsidy Lock.
PD Position Determination. Process by which the mobile GPS position is obtained.