The Service Module SM (Zvesda, DOS 8 (Dolgovremennaya Orbitalnaya Stanziya 8), 17KSM) was
the first fully Russian contribution to the International Space Station and serves as the
early cornerstone for the first human habitation of the station.
The module provides the early station living quarters, life support system, electrical
power distribution, data processing system, flight control system and propulsion system.
It also provides a communications system that includes remote command capabilities from
ground flight controllers. Although many of these systems will be supplemented or replaced
by later U.S. station components, the Service Module will always remain the structural and
functional center of the Russian segment of the International Space Station.
The SM was modified from the base block of the planned Mir 2
space station.
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