Chapter 1 – Product Description and Specifications
Multi-Tech Systems, Inc. MultiModem CDMA USB Wireless Modem User Guide
8
Antenna/RF Specifications
CDMA 800
CDMA 1900
Frequency
824 to 894 MHz
1850 to 1900 MHz
Impedance
50 ohms
VSWR
<2
Typical Radiated Gain
0 dBi on azimuth plane
Interfaces
The Wireless MultiModem has several interfaces:
LED function indicating operating status
External antenna (via SMA connector)
USB connector
Microphone and speaker (via handset jack)
LEDs
LED Indicators
TD
Transmit Data.
Light is on when modem is transmitting data.
RD
Receive Data.
Light is on when modem is receiving data.
CD
Carrier Detect.
Light is on when data connection has been established.
LS
Line Status.
Continuous “on”
state
indicates that the wireless modem is not registered on the network.
Flashing
state
indicates registration on network.
Off state
. Modem is off (not ready) or in download mode.
TR
Terminal Ready.
Commonly called “Data Terminal Ready.” This is a readiness signal from the PC.
PWR
Power.
Light is on continuously to when power on. (On the IP model, this LED flashes when power is
on.
AT Command Information
AT commands for the CDMA wireless modem are published in a separate CDMA AT Commands Reference
Guide included on the MultiModem CD and posted on the Multi-Tech web site.
IP commands for CDMA modems are also published in a separate CDMA AT Commands Reference Guide
included on the MultiModem CD and posted on the Multi-Tech web site.