Specifications

Chapter 21 – CDMA Terminology and Acronyms
124 Multi-Tech Systems, Inc. CDMA C1 AT Commands Reference Guide
PDU Protocol Data Unit. It is a GSM SMS standard whereby any type of binary data can be
transported via an SMS message. In the CDMA system, the PDU mode will not be supported;
instead, the Unicode format message is supported.
PN Offset Pseudorandom Noise Offset. In a CDMA network the PN offset is a variable time delay
offset of a repeating random noise generator that is used to distinguish individual sectors of
a base station.
P-REV The CDMA revision of the mobile or base station.
PRI Provisioning Information. Provisioning Information is your cellular network carrier’s profile
of information that must be programmed into your cellular modem in order for it to operate
on the carrier’s cellular network.
PRL Preferred Roaming List. The Roaming List is provided by the cellular network carrier during
the process of provisioning your SocketModem. The PRL is a list of cellular service provider’s
preferred roaming partners.
PSTN Public Switching Telephone Network. It is the traditional telephone network.
RF Radio Frequency.
RSSI Receive Signal Strength Indicator. This parameter represents the total RF received signal
power from the base station(s) the mobile sees.
R-UIM Removable User Identity SocketModem. The R-UIM is similar to a SIM (Subscriber Identity
SocketModem), but it is designed for networks other than GSM (Global System for Mobile
Telecommunications); i.e., networks such as CDMA.
The R-UIM card contains user information and data features on a removable smart card
about the size of a postage stamp. It is a dual-mode solution that can store both GSM
provisioning and CDMA provisioning on a single card. When used with a GSM handset, the
R-UIM operates like a GSM SIM.
SID System ID. The SID is an identification number that represents geographic locations of a
common coverage area, usually a large city. Also see NID.
SIM Subscriber Identity SocketModem. A SIM card is a portable memory chip. The SIM holds
personal identity information, cell phone number, phone book, text messages and other
data.
SMS Short Messaging Service. A supplementary service capable of sending and receiving short
length text messages to/from the mobile.
SREJ Selective Reject. An optional feature of V.42 which enhances data throughput on noisy
connections. As data blocks are sent out, the remote side acknowledges only after an
agreed upon number of blocks are received (window size). If any block is received bad, the
sender is notified of the rejected bad block so it can be retransmitted.
TA/TE Terminal Application/Terminal Equipment. This is the end “device” (combination of
hardware and software) that communicates with a modem via a serial link. In this context, it
is the device (PDA/Computer) connected to the modem. Also see DTE.
TON/NPI Type of Number/Numbering Plan Identification.
V24-V25 A data compression algorithm.
V42 A data compression algorithm.