Introduction to Networking for NonStop S-Series Servers

Glossary
Introduction to Networking for HP NonStop S-Series Servers—520670-005
Glossary-13
Measure
communicates to control a particular subsystem. (For example, an application controls
SNAX/XF by issuing requests to the SCP, but the SSCP process actually services the
requests. The SCP is the management process, and the SSCP is the manager
process.)
Measure. A tool used for monitoring the performance of HP NonStop systems. Measure can
be used in an Expand network to determine if the network is contributing to
performance problems.
media access control (MAC). A subset of Layer 2 of the Open Systems Interconnection
(OSI) Reference Model, responsible for orderly sharing of a communications medium
by multiple nodes on a local area network (LAN).
message handling (or messaging). The computing function that allows exchange of
electronic messages among users in a network. Electronic mail and electronic data
interchange (EDI) are examples of message-handling applications.
Message Store (MS). Within a message handling system (MHS), a structure and a related
processing entity equivalent to a mailbox for a specific user, through which the user
can submit and retrieve messages. A process or set of processes called a User Agent
(UA) interacts with the MS on the user’s behalf.
Message Transfer Agent (MTA). Within a message handling system (MHS), a processing
entity that relays messages across the network.
MFIOB. See multifunction I/O board (MFIOB).
modem. Modulator-demodulator. A device that translates digital signals to analog form, and
vice versa, permitting computer communications to occur over telephone lines.
Multicast. An Internet Protocol (IP) address type of UDP port that sends and receives
messages to and from multiple recipients (as in Internet subscription services).
multifunction I/O board (MFIOB). A ServerNet adapter
that contains ServerNet
addressable controllers (SACs) for SCSI and Ethernet
; a service processor; ServerNet
links to the processor, to the two ServerNet adapter slots, and to one of the ServerNet
expansion board (SEB) slots; and connections to the serial maintenance bus (SMB),
which connects components within an enclosure to the service processor (SP).
multi-CPU path. The fundamental component of the Expand multi-CPU feature. A multi-
CPU path can consist of up to 16 individual Expand paths, including multiline paths.
Each Expand line-handler process (or multiline path) that is a member of a multi-CPU
path is configured in a different processor. See also Expand multi-CPU feature.
multiline path. A path between two neighbor systems that consists of more than one
physical line. You can configure as many as eight parallel lines between the same two
systems. The Expand subsystem will simultaneously transmit data over all of the lines
in the path, increasing overall bandwidth. The Expand subsystem also automatically