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offline diagnostics
Diagnostics that only operate in stand alone mode. User operations
cannot take place with offline diagnostics running.
offline sequence
OLS. (1) Sequence sent by the transmitting port to indicate that it is
attempting to initialize a link and has detected a problem in doing so.
(2) Sequence sent by the transmitting port to indicate that it is offline.
offline state
When the switch or director is in the offline state, all the installed
ports are offline. The ports transmit an offline sequence (OLS) and
they cannot accept a login got connection from an attached device.
Contrast with
online
state.
ohm
A unit of electrical resistance equal to that of a conductor in which a
current of one ampere is produced by a potential of one volt across
the conductor terminals (D).
OLS
See
offline
sequence.
online
Referring to data stored on the system so it is available immediately
to the user.
online diagnostics
Diagnostics that can be run by the customer engineer while the oper-
ational software is running. These diagnostics do not impact user
operations.
online state
When the switch or director is in the online state, all of the unblocked
ports are allowed to log in to the fabric and begin communicating.
Devices can connect to the switch or director if the port is not blocked
and can communicate with another attached device if both devices
are in the same zone, or if the default zone is enabled. Contrast with
offline
state.
Open Systems
OSI. A model that represents a network as a hierarchical structure of
Architecture
functional layers. Each layer provides a set of functions that can be
accessed and used by the layer above. Layers are independent, in that
implementation of a layer can be changed without affecting other lay-
ers (D).
open systems
OSMS. An optional feature that can be enabled on the director or
management server
switch through the Element Manager application. When enabled,
host control and management of the director or switch are provided
through an Open System Interconnection (OSI) device attached to a
director or switch port.
Glossary
563
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