SWAN 2 Concentrator Installation and Support Guide

Glossary
SWAN 2 Concentrator Installation and Support Guide—429593-010
Glossary-2
data link control (DLC) task
data link control (DLC) task. Tasks that support the equivalent to Layer 2 of the Open
Systems Interconnection (OSI) reference model. Wide area network (WAN) DLC tasks
execute in the SWAN 2 concentrator communications line interface processor (CLIP),
and each WAN DLC task controls one line interface. More than one type of DLC task
can run in the same CLIP. Two DLC tasks run in each CLIP.
data terminal equipment (DTE). Equipment that constitutes the data source or data sink
and provides for the communication control function protocol; it includes any piece of
equipment at which a communication path begins or ends. The SWAN 2 concentrator
is a DTE and connects to a modem. See also data circuit-terminating equipment
(DCE) and modem.
DCE. See data circuit-terminating equipment (DCE).
download. The process of transferring software from one location to another, where the
transferring entity initiates the transfer.
DTE. See data terminal equipment (DTE).
Ethernet. A local area network (LAN) that uses the carrier sense multiple access with
collision detection (CSMA/CD) access method on a bus topology and is the basis for
the IEEE 802.3 standard. The Ethernet data transfer rate is typically
10 Megabits/second (Mbps).
field-replaceable unit (FRU). A unit that can be replaced in the field only by qualified
personnel trained by HP and cannot be replaced by customers. A unit is classified as a
FRU because of safety hazards such as weight, size, sharp edges, or electrical
potential; contractural agreements with suppliers; or national or international standards.
FIRMUP. A diagnostic task used to update the copy of the Portable Silicon Operating
System (pSOS) system product embedded kernel that is kept in the SWAN 2
concentrator communications line interface processor (CLIP).
firmware. Code in memory that is necessary for power-up initialization and communication
with a host or device. The software for components of the ServerNet architecture (for
example, an adapter) is called firmware. Some firmware for ServerNet components is
downloaded when the system or component is loaded. See also FIRMUP.
flash memory. A type of memory that contains essential firmware and nonessential
firmware.
flash PROM. A type of programmable read-only memory (PROM) that is electrically
reprogrammable.
FRU. See field-replaceable unit (FRU).
FRU information record (FIR). A collection of information that every field-replaceable unit
(FRU) carries with it, such as part number, revision, track-ID, and media access control