NonStop System Glossary

SS7
See Signaling System Number 7 (SS7).
SS7TE PIC
See SS7TE plug-in card (PIC).
SS7TE plug-in card (PIC)
A plug-in card (PIC) used in the 6763 Common Communication ServerNet adapter (CCSA) that
supports the EIA-232, EIA-449, V.35, and X.21 interfaces.
SS7TE2 PIC
See SS7TE plug-in card (PIC).
SS7TE2 plug-in card (PIC)
A plug-in card (PIC) used in the 6763 Common Communication ServerNet adapter (CCSA) that
supports the E1, J1, and T1 interfaces.
S-SAC
See SCSI ServerNet addressable controller (S-SAC).
S-series servers
See HP NonStop S-series servers.
SSI log
See System Service Information (SSI) log.
stackable enclosure
An enclosure that can rest on top of another enclosure. A stackable enclosure is not installed on
a frame base. Contrast with base enclosure.
standby power generator
A turbine-driven or engine-driven generator that provides a backup source of power to designated
loads. Often used to supplement an uninterruptible power supply (UPS) in the event of extended
utility outages.
star group
One set of X and Y NonStop Cluster Switches and the ServerNet nodes (up to eight) that are
connected to them. A star group can be thought of as a segment of a split-star or tri-star topology.
A split-star topology can contain up to two star groups. A tri-star topology can contain up to three
star groups.
star topology
A network topology in which all nodes are connected to a central hub (NonStop Cluster Switch).
Each node has its own connection to the network, so a break in the connection does not affect
other nodes in the network. In a ServerNet cluster, a star topology requires one cluster switch for
each external fabric and can support up to eight nodes. See also split-star topology, tri-star topology,
and layered topology.
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