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edge switch 2/16 service manual Glossary–37
Glossary
O
octet
An 8-bit quantity, often called a byte or word. An octet can equal a byte as long as the byte
equals eight bits. See also byte.
OEM
See original equipment manufacturer.
offline
Referring to data stored on a medium, such as tape or even paper, that is not available
immediately to the user.
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 operational 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.