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SEMC
Sony Ericsson Mobile Communications
SID
System Identifier
SLC
Subsidy Lock Code
SMS
Short Message Service
SO
Service Option
SPC
Service Programming Code
SPI
Security Parameter Index
TCP
Transmission Control Protocol
QNC
Quick Network Connection
2
Overview of the CM52 Module
The CM52 is a dual band CDMA/AMPS 800 MHz and CDMA 1900 MHz transceiver module. It is designed for
consumer and OEM industrial voice and data applications. At this time, the SEMC customer base requires
data only applications; therefore voice capabilities have not been addressed.
The CM52 module is intended for mounting into an application developer's chassis to provide wireless
communication capability for the product. The target chassis may take a wide variety of forms, such as a
residential electric meter, a point of sale terminal, an alarm panel, or an automobile console. All initial
configuration, mode control, and operational commands are issued to the CM52 module over an RS-232 serial
port using a flexible AT command format.
This manual provides a description of the software features available and all of the AT commands that are
supported in the CM52 and how to use them. For more information about the CM52 module refer to the
Integrator's Manual.
3
Functional Description
This chapter describes the functional capability of the CM52 module. The module performs a set of telecom
services according to TIA/EIA/IS-2000. AT commands are used for communication with CM52.
3.1
Voice Calls
Basic voice calls are supported over CDMA and AMPS according to the following specifications:
Telephony according to TIA/EIA/IS-2000.
Emergency according to TIA/EIA/IS-2000.
An incoming call is indicated by an unsolicited response code (RING indicator). The module must be
registered with the network before the network will send an incoming call to the module. Due to power saving
algorithms, the CM52 will time out of the wait-for-answer state after approximately 22 RING attempts. After
the timeout occurs, the module will tear down the call. In addition, the carrier implementation usually limits the
time duration for ringing. Thus the actual number of RING indications could be limited by the network. When
this limit is reached, the network will initiate tearing down the call.
An outgoing call can be made before the module has registered with the network. An outgoing call is
considered an implicit registration: the network has been made aware of the module through the call request.
The audio input and output signals in the interface (AFMS and ATMS) will carry analog speech in full duplex
(transmitting and receiving simultaneously).
3.2
Subscriber Call features
The CM52 module supports the following Subscriber Call features:
Caller ID. Enables/disables the caller's ID from being sent to the called party.
Confidential
USERS MANUAL
Document number
1/198 17-4/FCP 101 3045 Uen
17(158)
Revision
D
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