User's Manual

General Document, Register Cobra module on CMU200

Author:

Version:

V01

–

Creation Date:

Jul 31, 2006

Page:

3 of 6

Option Confidential:

This document is Option Confidential - it may not be duplicated, neither distributed externally without prior and written permission of

Option NV.

1 INTRODUCTION

This document describes how to register an Option Cobra Module on a CMU 200. This manual will guide

you through the steps so you can do some tests on the CMU 200.

2 REGISTERING THE MODULE TO THE CMU200

Note: When mentioned switch off, AT+CFUN should be set to: AT+CFUN=0

When mentioned switch on, AT+CFUN should be set to: AT+CFUN=1

Use RF2 connection of CMU200 to connect the module. Select GSM or WCDMA on CMU. When the card

is properly configured, and the preferred band is selected, the card will register automatically on the

system.

When the card does not register on the CMU with the default setting of the CMU, please check the settings

in the following paragraphs.

If the CMU has the integrity check enabled, you can use the card without any security setting changes

(AT_OSEC=4). If not, please change the OSEC setting of the card: set OSEC to 3 (AT_OSEC=3) using a

terminal program (for ex. HyperTerminal). For life networks, integrity checks are default enabled, so the

OSEC setting needs to be set on 4.

2.1 Settings on CMU200

1. RF connector compensation:

Look if compensation settings are right: AF/RF. In normal use, meaning when your cables are all

very well isolated, you have to compensate both directions for a minimum of +0,5 dB. You can

choose higher values when you think the cables are not isolated enough.

2. BS signal too low:

When at first try, the card doesn’t seem to register, try to increase the BS signal levels. Normal

operation would be around 65 dBm. Try this value and switch the card off and on again.

After checking these settings. Switch off and switch on the card again. (at+cfun=0 and at+cfun=1)

It is also recommended to safe remove the card.