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<h2>Operation and Maintenance security</h2>

<p>To ensure security in the DX 200 system, that is, for Nokia
Base Station Controller and Nokia Transcoder Submultiplexer, a number of precautions
have been designed to minimise security risks. There is, for example, a special
authority system in the man-machine interface (MMI) system for operation and
maintenance.</p>


<p>To avoid external misuse, the MMI system can be operated
only by a person with a defined user ID and password. Internal security is
ensured by restricting the rights of the users, that is, some users may use
only certain man-machine language (MML) commands.</p>


<p>The users may also be divided into groups, usually according
to their expertise. The groups are given certain profiles that define which
commands the users can use according to their need. If the MML terminals are
situated in a place with open access, profiles may be defined also for them.</p>


<p>The login to Nokia NetAct system is password protected.
For more safety, the password is allocated only for a specified period of
time and cannot be used after it has expired. Generally the login to Nokia
NetAct and its applications can be controlled by the NMS system administrator.
It is possible to define, for example, separate user groups for certain geographical
areas or for certain applications only.</p>


<p>At the base station site, external alarms can be used to
indicate overheating, excess humidity, or vandalism, for example.</p>
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