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<h1>Nokia Base Station Subsystem compatibility with other
NSSs and GPRS Core networks</h1>

<p>Nokia BSS needs to be compatible not only with Nokia Network
Subsystem (NSS) but also with other suppliers' NSSs. In addition, Nokia BSS
has to be fully compatible with the network service and management system
(Nokia NetAct) and other support equipment. Therefore the compatibility issues
are an essential part in the design of Nokia BSS and its network elements.
Nokia BSS compatibility is defined per release level.</p>


<p>Nokia BSS is based on the GSM/EDGE specifications set by
the 3GPP. These specifications are designed to guarantee the
interoperability of equipment from different manufacturers in the same GSM
network.</p>


<p>As a company, Nokia is committed to the idea of open interfaces.
In the GSM network the interface between the Mobile Switching Centre (MSC)
and the Base Station Subsystem (BSS), the so-called A interface, can be considered
such an open interface. Therefore Nokia has carried out extensive testing
concerning the A interface. Nokia has tested its BSS with all the major switch
suppliers on the market during several years. Nokia MSC has also been proved
to interwork with other manufacturers' BSSs. At the moment Nokia BSSs work
in live operational networks around the world with Alcatel, Motorola, Siemens,
Ericsson, and Nortel MSCs.</p>


<p>In BSS multivendor integration Nokia follows the so-called
Ladder Model when introducing new software releases. It means that whenever
Nokia produces new software, Nokia is the driving force in ensuring compatibility
on specification level. Furthermore, Nokia is active in making the required
verification arrangements.</p>
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