Multi-Tech Systems MTCBA-C-U - Manual (Page 10)

Chapter 1 – Product Description and Specifications
Multi-Tech Systems, Inc. MultiModem CDMA USB Wireless Modem User Guide 10
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.