CM-42 Technical Description
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SEM/CX-02:0076/DES A
The physical dimensions of a sample SMA connector and mounting hole are shown in the drawing below.
Figure 18: SMA Right Angle Through-Hole Connector
(Dimensions are in mm)
Electrical performance parameters are valid only when the terminating impedance at the output of the antenna
connector exhibits a VSWR of less than 2:1 for all phase angles in the frequency band of operation. High VSWR
loads at the antenna connector adversely affect current consumption, linearity, and power efficiency of the module
and may degrade operation, however, internal protection circuitry has been added to the design to prevent
damage.
2.5 Functional Description
This section describes the functionality capability of the CM-42 module. The module performs a set of telecom
services according to TIA/EIA-IS-2000. The functions of the display and keypad, usually used to make calls, are
implemented by issuing AT Commands over the serial interface. To find out how to send SMS messages, make
data calls, use the burst mode services and handle the Phone Book.
2.5.1 Speech Calls
In this prototype version of the module basic voice calls are supported over CDMA and AMPS.
The module offers the following telecom services:
•
Telephony
according to TIA/EIA/IS-2000.
•
Emergency
according to TIA/EIA/IS-2000.
An incoming call is indicated by a unsolicited response code (RING indicator).
The audio input and output signals in the interface (AFMS and ATMS) will carry analog speech in full duplex
(transmitting and receiving simultaneously). The module supports both Full-Rate speech coding and Enhanced
Full-Rate (EFR), if EFR is available in the network.
