AirLink Communications 5200 Instrucciones de instalación y funcionamiento

Application Note

for connecting the

AirLink Raven CDPD Modem

to Ethernet Devices using the

IP 5200 from DCB

March 2002

AirLink Communications, Inc.

Confidential Material -Not For Redistribution

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THIS DOCUMENT CONTAINS CONFIDENTIAL MATERIAL AND

IS NOT INTENDED FOR REDISTRIBUTION.

Information contained herein is the property of AirLink Communications, Inc. and is produced for the

purpose of detailing technology developed by AirLink Communications, Inc. and its employees.

Reproduction or distribution of this document without the express written consent of AirLink

Communications, Inc. is strictly prohibited. This document is subject to change without notice.

Please send comments to:

Email: [email protected]

Fax: 510-226-4299

Phone: 510-266-4200

Post: AirLink Communications, Inc.

Attention: Technical Publications Dept.

472 Kato Terrace

Fremont, CA 94539

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CONTENTS

1. OVERVIEW.....................................................................................................................................4

2. INTERNET (TCP/IP) CONNECTION VIA CDPD.....................................................................4

3. ETHERNET DEVICE & IP5200 CABLING & INSTALLATION.............................................4

4. IP5200 CONFIGURATION ..........................................................................................................5

5. AIRLINK RAVEN CDPD MODEM CONFIGURATION.........................................................11

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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

Internet

Local

CDPD

Network

Other

CDPD

Networks

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Diagram of how to connect the IP5200 Router and CDPD modem:

4. IP5200 Configuration

Setting up the IP5200 should be done using the instructions provided by DCB. The DIP Switches

on the Ethernet side of the unit are used for handshake and flow control and should be set as follows:

The following screen shots cover the device settings specific to connecting to a CDPD Modem.

192.168.1.101

Ethernet

Crossover

Cable

RS232

192.168.1.100

166.x.x.1

IP Address of CDPD Modem becomes Public Side

Address of Router during PPP negotiations.

IP5200 is both a Dial

Demand

Router and Network Firewall

Private Class

C IP Addresses are on same

subnet using subnet mask 255.255.255.0.

At the ‘

’ page,

select the ‘Internet Access’

button. The Configure bu

tton

takes you to the Main Menu.

100

1 2 3 4 5

Power

Jack ££¤¤¤

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You will need to set the Internet

Account,

LAN Settings, and

Dial-out Modem parameters.

The Internet Access se

tup

screen for Ports 1 and 2 has

three requirements:

-‘Enable’ must be checked

-Tel-1 and Tel-2 should be

entered as shown

-Disconnect after Idle Time

should be set to ‘0’.

This will make sure the

IP5200 does not drop the

PPP connection when the

serial port is idle.

Multi

port Usage

Even though the

IP5200’s (2) serial

ports can be used for

Multi-

link PPP, this is

not a feature that can

be used over CDPD

network.

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LAN Configuration is actually

referring to the Ethernet Port.

The LAN IP Address needs to be

different from the PLC address, but on

the same network and using the same

Net Mask.

You will need to supply your own DNS

Settings. You can get these from your

CDPD carrier.

Since there is no actual

Internet Account when

connecting to a CDPD

Modem, you can leave the

User Name, Password, and IP

Address allocated by ISP left

blank.

DNS should be the same as

entered on the previous

screen.

No Script File is needed.

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Select the Modem option.

Selecting the ‘Properties’ button

will take you to the Modem

Properties screen.

The Modem setup screen has four

requirements:

-Initial String should be ‘AT’

-Serial Line Speed = 19200

-Dial Type = Other

-Dial String = ‘ATDT’

-Auto-answer commands are N/A

-Select ‘Save as Other’

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The Advanced Menu has a great

many fea

tures, most of which do

not apply to this application.

Most of these settings deal with the

firewall functions inside the

IP52000. Since there is only one

device on the Ethernet port, and it is

connected to a CDPD Modem, and

not an ISP, the firewall is no

t really

necessary.

To put the Ethernet port outside the

IP5200, you must set the device up

as an Exposed Computer.

Select Enable Exposed

Computer Feature and

enter the IP of the Ethernet

device. In this case it is

192.128.1.101.

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Checking to see if the

router works is easy.

Go to the Port Status page

on the Main Menu and

Select the Dial-Up

button.

You can watch the Log for

entries and errors, and see

the Physical Link and PPP

Link st

atus right on the

screen.

You know right away if the

connection to the modem is

working or not.

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