Architecture
DX 200 is a versatile, fault-tolerant, modular and highly scalable telephone exchange and general purpose server platform, designed for high performance, high availability applications. Its hardware is built from loosely coupled redundant computer units, backed by distributed software architecture.
Architecture of DX 200 allows live migration as well as software update during live operation. Unlike in many other switching platforms, DX 200 performs live software update without code patching. Therefore running code is not polluted by unnecessary jump instructions. Furthermore, as opposed to "integration guessing" of various software patches, DX 200 architecture makes proper integration testing of software components possible.
Live software update requires two computer units. One executing the old code ("working"), the other with new software loaded, otherwise idle ("spare"). During the process called "warming" memory areas (e.g. dynamically allocated memory, with the exception of stack of procedures) are moved from the old to the new computer unit. That implies that handling of data structures must be compatible in the old and the new software versions. Copying data does not require any programming effort, as long as allocation of data is done using TNSDL language.
Developing software for DX 200 platform is rather straightforward for any well educated software developer. TNSDL language, which plays vital role in producing asynchronously communicating fault-tolerant software modules, is easy to learn. Software architecture of DX 200 is a fine combination of highly efficient traditional solutions as well as modern actor model based, highly concurrent design.
DX 200 products are famous for availability exceeding 99.999% "five nines" as well as unrivaled performance.
Read more about this topic: Nokia DX 200
Famous quotes containing the word architecture:
“They can do without architecture who have no olives nor wines in the cellar.”
—Henry David Thoreau (1817–1862)
“Poetry is not only dream and vision; it is the skeleton architecture of our lives. It lays the foundations for a future of change, a bridge across our fears of what has never been before.”
—Audre Lorde (1934–1992)
“In short, the building becomes a theatrical demonstration of its functional ideal. In this romanticism, High-Tech architecture is, of course, no different in spirit—if totally different in form—from all the romantic architecture of the past.”
—Dan Cruickshank (b. 1949)