August 2016 Glossary 287
DF_CTL
Data field control indicates optional headers in the frame.
DIF
Data Integrity Field.
DIV
Data Integrity Validation.
Disassembly
The process of splitting out a source buffer into payloads. These payloads are then
transmitted in frames.
Discover Address (ADISC)
The Discover Address command used in Extended Link Services. It is invokable
when originated by the initiator, required as a response by the drive, and prohibited
when originated by a drive.
Discover F_Port Parameters (FDISC)
The Discover F_Port Parameters command used in Extended Link Services. It is
prohibited when originated by the initiator, and prohibited when originated by a
drive.
Discover N_Port Parameters (PDISC)
The Discover N_Port Parameters command used in Extended Link Services. It is
invokable when originated by the initiator, requires a response by the drive, and is
prohibited when originated by a drive.
Disparity
A form of error detection for frame transmission. Running disparity adds a second
dimension to the transmission of characters that provides a balance of ones and zeros
and helps protect transmission characters and controls the heat output of the
transmitter.
Drive Response
One of the functions of Extended Link Services.
E
E_D_TOV
See Error Detect Timeout Value.
Echo
The Echo command used in Extended Link Services. It is prohibited when originated
by the initiator, and is prohibited when originated by a drive.
ECMA
European Computer Manufacturers Association
Encoding
The process used to change the original form in which information is available, into
another form. An example of this is changing handwritten text into computer bytes.
End-of-Frame Delimiter
A special transmission word in a frame used to mark the end of that frame.
Enterprise System Connection (ESCON)
An IBM-patented set of products and services that provide a dynamically connected
environment, over fiber optic cable, within a mainframe or client server enterprise.
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