User guide

Developers guidelines | AT commands
343 June 2010
PDA
Personal Digital Assistant
PDP
Packet Data Protocol
PDU
Protocol Description Unit
Phone Book
A memory in your mobile phone or SIM card where phone numbers can be stored and
accessed by name or position.
Protocols
The rules or procedures all modems must follow to communicate.
QoS
Quality of Service
Result code
A message the modem sends to the computer containing information about the state
of the modem.
RLP
Radio Link Protocol, an error correction protocol used during radio link connections.
RLSD
Received Line Signal Detect. See AT&C.
RTS
Request To Send. An EIA232 signal sent from the computer to the modem, usually
indicating that the computer is ready to send data to the modem.
RS-232-C interface
A communication standard established by the Electronics Industry Association
(Recommended Standard number 232, revision C). Originally established to
standardise communication between computer and modem. It was later adapted to
become a popular standard for communication between computer and any other
peripheral equipment, including other computers.
SAP
Service Access Point
SC
Service Centre (for SMS)
SDU
Service Data Unit
Serial port
The port through which digital signals are exchanged between the modem and the
computer.