NonStop System Glossary

serial copper
A standard for physical connectivity in ServerNet I and ServerNet II networks that is available both
in NonStop servers and in Windows NT clusters. Serial copper uses serial encoding and supports
50 and 125 megabyte/second (MB/s) speeds. The maximum link distance at 125 MB/s is 25
meters.
serial copper PIC
See serial copper plug-in card (PIC).
serial copper plug-in card (PIC)
A plug-in card (PIC) for the modular ServerNet expansion board (MSEB) and I/O multifunction
(IOMF) 2 customer-replaceable unit (CRU) that supports the serial copper interface. See also serial
copper and plug-in card (PIC).
serial maintenance bus (SMB)
A bus that connects service processors (SPs) within an enclosure to each other and to the
customer-replaceable units (CRUs) in the group.
serial maintenance bus (SMB) domain
The set of enclosures, modules, field-replaceable units (FRUs), and customer-replaceable units
(CRUs) connected by a common serial maintenance bus (SMB).
server
1. An implementation of a system used as a stand-alone system or as a node in an Expand network.
2. A combination of hardware and software designed to provide services in response to requests
received from clients across a network. For example, NonStop servers provide 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.
server application
An application that provides a service to a client application. An application that provides local
execution of remote procedure calls is an example of a server application.
ServerNet
A communications protocol developed by HP that is used in NonStop servers. See also ServerNet
I and ServerNet II.
ServerNet I
The first-generation ServerNet network. ServerNet I architecture is used in NonStop S-series servers
and other products. It features 50 megabytes/second speed, 6-port ServerNet routers, 8b/9b
encoding, and a 64-byte maximum packet size. See also ServerNet II and “ServerNet 3” (page 168).
ServerNet II
The second-generation ServerNet network. ServerNet II architecture is backward-compatible with
ServerNet I architecture, and it features 125 (or 50) megabytes/second speed, 12-port ServerNet
S 167