ATM Adapter Installation and Support Guide

Glossary
ATM Adapter Installation and Support Guide—420013-002
Glossary-5
primary processor
physical access point (such as a connector) to a computer, multiplexer, device, or
network where signals are supplied, extracted, or observed.
primary processor. The processor that is designated at system generation time as
“owning” the controller connected to the two separate processors of a NonStop Kernel
operating system. The primary processor is the processor that has direct control over
the controller. See also backup processor.
processor. (1) The central processing unit (CPU). The processor reads program
instructions, moves data between processor memory and the ServerNet addressable
controllers (SACs), and performs arithmetic operations. (2) One or more computer
chips, typically mounted on a logic board, that are designed to perform data processing
or to manage a particular aspect of computer operations.
processor multifunction (PMF) CRU. A NonStop Snnn customer-replaceable unit (CRU)
that contains a power supply, service processor, ServerNet router, Ethernet controller,
three SCSI ServerNet addressable controllers (SACs), and a processor and memory
system in a single unit. The PMF CRU consists of three subassemblies: the processor
and memory board (PMB), the multifunction I/O board (MFIOB), and the bulk power
supply subassembly.
protocol. A set of rules used by processes or devices for exchanging data.
PVC. See Permanent Virtual Circuit (PVC).
SAC. See ServerNet addressable controller (SAC).
SAP. See Service Access Point (SAP).
SCF. See Subsystem Control Facility (SCF).
ServerNet adapter. A customer-replaceable unit (CRU) that connects peripheral devices to
the rest of the system though a ServerNet bus interface (SBI). A ServerNet adapter is
similar in function to an I/O controller logic board (LB) and backplane interconnect card
(BIC) in other NonStop systems.
ServerNet addressable controller (SAC). A ServerNet addressable controller (SAC)
corresponds to controller functionality uniquely addressable within one or more
ServerNet address domains through the node ID and address fields in a request
packet. A SAC is typically implemented on some portion of a processor multifunction
CRU, an I/O multifunction CRU, or a ServerNet adapter. Examples: Each of the
controllers on a multifunction I/O board (MFIOB), the controller on an ATM3 ServerNet
adapter (ATM3SA), and Ethernet 1 ServerNet adapter (E1SA), and each of the
controllers on a device connect ServerNet adapter (DCSA).
ServerNet SAN. See ServerNet system area network (ServerNet SAN).
ServerNet system area network (ServerNet SAN). A wormhole-routed, full-duplex,
packet-switched, point-to-point network designed with special attention to reducing