QIO Configuration and Management Manual

Glossary
QIO Configuration and Management Manual—424717-008
Glossary-11
ServerNet LAN Systems Access (SLSA) subsystem
services in response to requests received from clients across a network. For example,
the HP NonStop™ servers provides transaction processing, database access, and
other services. (3) A process or program that provides services to a client or a
requester. Servers are designed to receive request messages from clients or
requesters; perform the desired operations, such as database inquiries or updates,
security verifications, numerical calculations, or data routing to other computer
systems; and return reply messages to the clients or requesters. A server process is a
running instance of a server program.
ServerNet LAN Systems Access (SLSA) subsystem. A subsystem of the NonStop OS for
configuration and management of ServerNet local area network (LAN) objects in
G-series release version updates (RVUs).
ServerNet packet. The unit of transmission in a ServerNet communications network. A
ServerNet packet consists of a header, a variable-size data field, and a 32-bit cyclic
redundancy check (CRC) checksum covering the entire packet. The header contains
fields for control, virtual memory address, and destination and source fields to identify
the processor or I/O controller transmitting and receiving the packet. See also request
packet and response packet.
ServerNet transaction. The bidirectional, successful transmission of a pair of ServerNet
packets between two ServerNet devices. The device that originates the transaction
sends a request packet, and the device that receives the request returns a response
packet. See also request packet and response packet.
ServerNet wide area network (SWAN) concentrator. (1) An HP data communications
peripheral that provides connectivity to an HP NonStop™ server. The SWAN
concentrator supports both synchronous and asynchronous data over RS-232,
RS-449, X.21, and V.35 electrical and physical interfaces. (2) A collective term for both
SWAN concentrators and SWAN 2 concentrators when a distinction between the two is
not required.
ServerNet wide area network (SWAN) 2 concentrator. An HP data communications
peripheral that provides connectivity to an HP NonStop™ server. The SWAN 2
concentrator supports both synchronous and asynchronous data over RS-232,
RS-449, X.21, and V.35 electrical and physical interfaces. The SWAN 2 concentrator is
the next-generation SWAN concentrator and has 12 WAN ports.
service side. The rear side of a HP NonStop™ S-series system enclosure. It contains
processor multifunction (PMF) customer-replaceable units (CRUs) or I/O multifunction
(IOMF) CRUs, ServerNet expansion boards (SEBs) or modular SEBs (MSEBs), and
ServerNet adapters. The service side is opposite the appearance side. All cables are
accessed from the service side. Most service actions are performed from the service
side. Service side doors are supplied with later HP NonStop™ S-series servers but are
optional on earlier servers. Service-side doors are cosmetic and are not required for
system cooling.