AirLink 5200 User Manual

AirLink Application Notes 

 

AirLink Communications 

              Page

 4

 

www.airlink.com

 

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

 

 
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 
  

 
 

 
 

 
 

 

 
 

 
 
 
 
 
 
 

 

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).