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Glossary
279Web Tools Version 3.1.x/4.1.x User Guide
Device Connection Controls
Enables organizations to bind an individual device port to a set of one or more switch ports. Device
ports are specified by a WWN and typically represent HBAs (servers).
See also access control lists.
Device
A disk, a RAID, or an HBA.
Disparity
The relationship of ones and zeros in an encoded character. “Neutral disparity” means an equal
number of each, “positive disparity” means a majority of ones, and “negative disparity” means a
majority of zeros.
DLS
Dynamic Load Sharing. Dynamic distribution of traffic over available paths. Allows for
recomputing of routes when an Fx_Port or E_Port changes status.
Domain ID
As applies to HP StorageWorks switches, a unique number between 1 and 239 that identifies the
switch to the fabric and is used in routing frames. Usually automatically assigned by the switch, but
can be manually assigned.
DTE port
A data terminal equipment port capable of interfacing to a transmission circuit through a
connection to a DCE (data communications equipment) port. DTE devices with an RS-232 (or
EIA-232) port interface transmit on pin 3, and receive on pin 2 in a 9-pin connector (reversed in
25-pin connectors).
See also DCE port, RS-232 port.
DWDM
Dense Wavelength Multiplexing. A means to concurrently transmit more than one stream of data
through a single fiber by modulating each stream of data onto a different wavelength of light.
E_D_TOV
Error Detect Time-out Value. The minimum amount of time a target waits for a sequence to
complete before initiating recovery. Can also be defined as the maximum time allowed for a
round-trip transmission before an error condition is declared.
See also R_A_TOV, RR_TOV.