McDATA Sphereon 4500 User Manual page 193

Glossary
control unit port
An internal port on the CTP card that communicates with the
attached IBM S/390 or similar processor channels to report error
conditions and link initialization.
CRC
See cyclical redundancy check.
CTP See control processor card.
CUP See control unit port.
cyclical redundancy
System of error checking performed at both the sending and
check receiving station using the value of a particular character generated
by a cyclic algorithm. When the values generated at each station are
identical, data integrity is confirmed.
D
DASD Direct access storage device such as a disk drive.
data directory Critical information for all managed products (including directors
and switches). Information stored here includes: all EFC Manager
configuration data (product definitions, user names, passwords, user
rights, nicknames, session options, SNMP trap recipients, e-mail
recipients, and Ethernet event notifications); all log files (EFC
manager logs and individual Product Manager logs); zoning library
(all zone sets and zone definitions); firmware library; call-home
settings (phone numbers and dialing options); configuration data for
each managed switch (stored on the EFC Server and in NV-RAM on
each switch).
datagram See Class 3 Fibre Channel service.
default Pertaining to an attribute, value, or option that is assumed when none
is explicitly specified.
default zone Contains all attached devices that are not members of a separate
zone.
destination address Address identifier that indicates the targeted destination of a data
frame.
Glossary g-5