User's Manual

Chapter 4 – SocketModem Interfaces
Multi-Tech Systems, Inc. SocketModem CDMA Developer’s Guide 10
Chapter 4 – SocketModem Interfaces
This chapter describes the SocketModem interfaces.
· Flashing LED Interface
· RF Interface
Flashing LED
The flashing LED signal is used to indicate the working mode of the SocketModem.
LED and SocketModem Status
Signal SocketModem Status
OFF Download mode or switched OFF>
Continuously lit Switched ON (not registered on the network)ON
Flashing Switched ON (registered on the network)
RF Interface
The impedance is 50 Ohms nominal.
RF Connector
The RF connector is MMCX standard type. An antenna can be directly connected through the mating
connector or using a small adapter.
Transmitter Specifications
Transmitter performance test specification is CDMA2000 mobile station minimum requirement
standard, 3GPP2 TSG C0011-A
Operating Frequency
824MHz ~ 849MHz (Cellular Band)
1850MHz ~ 1910MHz (PCS Band)
Modulation
QPSK
Conversion Method
Heterodyne
Oscillation Method
VCTCXO & PLL Synthesizer
RF Output Power
Maximum
Minimum
0.2W
10nW (-50dBm)
Frequency Stability
+/- 300Hz
Open Loop Power Control Output
Power
RX= -25dBm
RX= -65dBm
RX= -104dBm
TX= -57.5 ~ -38.5dBm
TX= -17.5 ~ +1.5dBm
TX= +18 ~ +30dBm
Spurious Emission
RX Band
TX Band
Other Frequency
-80dBm at 1MHz RBW
-61dBm at 1MHz RBW
-47dBm at 30KHz RBW