6760 ServerNet/DA Manual

Glossary
6760 ServerNet/DA Manual—424879-003
Glossary-43
IEEE 802.3 protocol
IEEE 802.3 protocol. Institute of Electrical and Electronics Engineers (IEEE) standard
defining the hardware layer and transport layer of (a variant of) Ethernet. The
maximum segment length is 500 meters and the maximum total length is 2.5
kilometers. The maximum number of hosts is 1024. The maximum packet size is 1518
bytes.
impedance. The total opposition (that is, resistance and reactance) a circuit provides to the
flow of alternating current at a given frequency.
implementation-defined. Not specified by a standard. A correct value or behavior that is
implementation-defined can vary from system to system and therefore might represent
a feature or facility that cannot be ported.
in-band control (IBC). A symbol-based communications protocol for communicating
management information across a ServerNet link without interfering with any
application traffic in the network. In ServerNet II architecture, IBC traffic uses standard
ServerNet packets. ServerNet I architecture uses the Illegal Symbol variation of IBC,
which uses a subset of the available symbols to convey control information from one
node to another. The symbol subset chosen is from the group of symbols that are not
used for passing data; these symbols are usually considered illegal or unused.
incident report. A report sent by the Compaq TSM server software to the TSM Notification
Director Application. If remote notification (dial-out) is configured, the TSM Notification
Director Application forwards incident reports to a service provider. There are three
types of incident reports: problem incident reports, periodic incident reports, and
software configuration incident reports.
incremental discovery. Discovery of an HP NonStop™ S-series server when the Compaq
TSM client software has locally saved information but where there have been
configuration changes on the server since that information was saved.
indicator lights. Two light-emitting diodes (LEDs) on a customer-replaceable unit (CRU)
that indicate the status of the unit. The red or amber indicator light is lit when the unit is
not working properly; during startup, this light can indicate that the unit is not yet
functioning. The green indicator light is lit when the unit has proper power applied. See
also light-emitting diode (LED)
.
inductive reactance. Resistance at a frequency that is caused by the inductance of a coil
or circuit.
initial discovery. Discovery of an HP NonStop™ S-series server with which the Compaq
TSM client software has had no prior contact and for which the TSM client software
has no locally saved information.
initialization. The process of defining a new Distributed Systems Management/Software
Configuration Manager (DSM/SCM) target system, including giving it a name, setting
up default values used when processing requests, and creating the first software
revision (list of products) for the system.