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APPLICATION NOTE - Configuring the CX111 for J Series and Branch SRX Series Devices

Introduction

Due to their ubiquitous presence, the use of third-generation (3G) wireless networks has become a common

deployment option for both primary and backup connectivity. With the introduction of Juniper Networks

CX111 Cellular

Broadband Data Bridge, Juniper offers a simple way to provide wireless connectivity as either a backup or primary

connection for Juniper Networks J Series Services Routers and branch SRX Series Services Gateways products.

Scope

The purpose of this application note is to provide an overview that shows how to configure and deploy the CX111 as a

primary or backup 3G WAN connectivity option for Juniper Networks SRX Series and J Series platforms.

Design Considerations

Supported Hardware

• Juniper Networks SRX Series Services Gateways (SRX100 Services Gateway, the SRX200 line, or SRX650

Services Gateway)

• Juniper Networks J Series Services Routers

Soware Requirements

• Juniper Networks Junos OS release 10.1R1 or later

- There is a Dynamic Host Configuration Protocol (DHCP) memory leak issue with earlier Junos OS versions when

configured with the CX111

• CX111 firmware 1.6.10 or later

Card Compatibility

As of the date of this writing, about 50 different USB and ExpressCard modems have been certified to work with the

CX111. The latest list of modems can be found here: www.juniper.net/techpubs/hardware/junos-cx/cx111/index.html.

Card Activation

Before cards can be used, they need to be programmed with the subscriber information required to access the service

provider’s network. This is normally referred to as the card activation process. When service is purchased, the carrier

will request the card’s ESN number, normally found printed on the wireless card. This number is then used for card

identification by the different activation protocols.

Cards directly purchased from the wireless carrier can ship pre-activated, or sometimes they will ship with a companion

software used to perform the initial activation. In either case, cards already activated do not have to be reactivated.

Optionally, the cards can be activated from the CX111. This requires users to log into the CX111’s UI using a Web browser.

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