Cellular Digital Packet Data - CDPD

CDPD is particularly well-suited to mobile professionals because it offers a high-speed, high-capacity, low-cost system with the greatest possible coverage. Additionally, data is encrypted for greater security.

CDPD became a networking standard in the early 1990s, when a consortium of cellular carriers across the United States came together for the purpose of creating a method for sending data over cellular telephone channels. They wanted to provide a cost-effective, reliable and flexible solution to providing two-way wireless data communications service for mobile professionals.

Here's how it works: During transmission across cellular telephone channels, there are moments when the channel is idle. In fact, industry research indicates that over 30 percent of air time, even during heavy traffic, is unused. CDPD technology is able to detect and use these otherwise wasted moments by packaging data in small packets and sending it in short "bursts" during the idle time. As a result, the cellular channel operates more efficiently, and voice and data transmissions are unaffected. CDPD is based on the same communications protocol as the Internet, so mobile users have access to the broadest range of information.

AirLink CDPD Raven

The Raven is a rugged, full duplex Cellular Digital Packet Data (CDPD) modem that provides wireless transport capabilities for fixed and mobile applications. The Raven is an efficient and secure wireless packet data technology that is ideal for un-tethered applications. CDPD is more cost effective than circuit-switched cellular data for small volumes of data. It provides instantaneous response for transaction processing because there are no dialing delays. Additionally, built-in encryption maintains the security of the application data over the air.

The CDPD Raven is ideally suited for all fixed and mobile Industrial and Commercial Applications, including Telemetry, SCADA, Public Safety, Dispatch, Field Service, Financial Transaction Processing, and Security. The Raven’s embedded TCP/IP stack enables virtually any type of remote device to access the CDPD network.

The Raven is currently installed with many different types of Remote Terminal Units (RTUs) which perform remote metering and monitoring functions in the oil, gas, and water industries. The CDPD Raven can be a low-cost replacement for existing landline, private radio and circuit-switched cellular installations.

The Raven is certified by numerous Public Safety application providers and is installed with many Police Departments throughout the US.

Features

19.2 kbps raw data transfer rate
Full duplex transceiver
600 mW transmit power
Integrated TCP/IP protocol stack
Proven technology
Compact size
Rugged aluminum case
LEDs show status of CDPD operation
Mounting brackets

Application Interfaces

Standard interfaces include:

AT command serial character streams (uses embedded TCP/IP stack)
Host TCP/IP stack communicates with Raven using SLIP
Windows 95/98/NT Dial-Up Networking communicates with Raven using PPP
(Modem configuration file included)

In addition, several protocol conversions (Modbus, Opto22, BSAP) have been implemented to allow hosts to communicate with RTUs over CDPD without modifying the host or remote software.

Custom Application Development

AirLink can customize the software in the Raven to include all or part of your application processing. In some cases, the entire application can reside inside the Raven. No additional processor is required.

Wireless ACE

Windows 95/98/NT
modem configuration utility

Configure AirLink Modems locally or remotely without using AT commands
Monitor the operating status of an AirLink Modem locally or remotely
Secure communications with password protection
Reduce troubleshooting time and support costs

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Specifications

Physical Characteristics		NovAtel Wireless CDPD Modem NRM6812
Weight:	< 2 lb.	Integrated TCP/IP		Full Duplex
Size:	6.8" x 3.3" x 2"	Transmit Power		600 mW
Status LEDs:	Power	Transmit		824-849 MHz
	Channel Acquired	Receive		869-894 MHz
	Link Status	RF Protocol		CDPD 1.0, 1.1
	Network Registration	Airlink Data Rate		19.2 Kbps
	RSSI	Serial Protocols		AT Commands
	Transmit			SLIP
	Receive			PPP
	Block Errors
RF Antenna Connector		Power Requirements
50 Ohm TNC		Input Voltage	9 VDC to 30 VDC
		Input Current	.10 to .54 Amps
Serial Interface		Typical Receive	.14 Amps @ 12 VDC
RS-232 DB-9F		Typical Transmit	.34 Amps @ 12 VDC
300-19,200 bps
Environmental		Warranty
Operating Temperature Range -30° C to 70° C With transmissions limited to a 10% duty cycle above 60° C Humidity: 5% - 95% Non-condensing		Software	1 year updates & feature enhancements
		Hardware	1 year parts and labor
			Extended warranties available

Cellular Digital Packet Data About the Technology

Cellular Digital Packet Data
About the Technology