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AirLink Application Notes
AirLink Communications Page 4 www.airlink.com
1. Overview
This document describes how to connect the AirLink Raven CDPD Modem to the IP5200 Async-
Router from Data Communications for Business (DCB). Information on the IP5200 and DCB is available
at www.dcbnet.com. Additional information about AirLink Communications products is available at
www.AirLink.com
2. Internet (TCP/IP) Connection via CDPD
Normally, remote access to an IP 5200 is done via Dialup Telephone Line. When using CDPD, remote
access to is done via a TCP/IP connection to the CDPD Network (ie: Internet) and the use of a CDPD
Modem connected to a DCBNet IP5200 Single-Port Async-Router.
On the HOST side, access to the CDPD Network could be made using any of the following means:
1. Using a Frame Relay connection into the CDPD Network
2. Using the public Internet
3. Using another CDPD Modem connected to the Host System
3. Ethernet Device & IP5200 Cabling & Installation
Setting up the Ethernet device (PC, RTU, PLC, etc) for communicating over CDPD is fairly
straightforward. All the same configuration settings used for a LAN installation apply to a CDPD
installation. Since the device is actually sitting on a very small LAN, (just the device and the IP5200), the
IP Address would be a private IP, such as: 192.168.1.101. The IP5200 would have an Address in the
same range, such as: 192.168.1.100.
DNS, FTP, SMTP, and Email settings would be for servers visible to the public Internet or in the
case of Frame Relay connections to the CDPD network – IP Addresses visible to the Frame Relay cloud.
(See your Network Administrator or Carrier for more details on which Addresses or server names to use).
When the device initiates Ethernet traffic (by either sending an email or starting an FTP session, etc),
the router will dial the CDPD modem and establish a PPP connection. The CDPD Modem will supply the
router with its IP address, virtually becoming the router’s Internet Service Provider (ISP).
Frame
Relay
3
1
2
Internet
Local
CDPD
Network
Other
CDPD
Networks