Cellular modems need to be very robust as the inherent disadvantages of the analog cellular phone system become especially evident with high speed data transfers. Cellular coverage could be of a quality not compatible with high speed data transfers and handshaking protocols. Often more than one cellular provider offers coverage in an area and it is worthwhile to investigate several options. A good voice communication does not translate into a acceptable data communication. Your choice of cellular modem and cellular phone should be able to run off 12VDC, even if AC power is available, to facilitate DC (battery) backup.

• Zyxel 1496P Portable Cellular Modem
• Raven II CDPD This document describes how to set up the Raven CDPD, which is a wireless modem using digital cellular technology. One advantage to using this technology is that it minimizes telemetry infrastructure, allows for a complete standalone system, and an internet presence is established for the remote GPS system.

Suggested Minimum Requirements

• 12 VDC power
• V.32, V.32bis communication protocols
• V.42, MNP error correction/data compression
• RTS/CTS hardware flow control
• High speed baud rates (2.4-19.2 kbps)
• Compatible with CCITT and Bell standards
• Support industry-standard AT command set
• Compatible with RS-232 Control Signals

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Last modified Thursday, 17-Nov-2005 03:57:00 UTC

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