Multi-Tech Systems MTCBA-C-U Antenna/RF Specifications, Interfaces, LEDs, AT Command Information

Chapter 1 – Product Description and Specifications

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.

Multi-Tech Systems, Inc. MultiModem CDMA USB Wireless Modem User Guide 10