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.