IBM TotalStorage SAN140M, Installation And Service Manual

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351 Glossary
control processor card A printed circuit board that provides the microprocessor and control
logic for all directors and switches. The CTP card also initializes
hardware components after system power-on. The board may also
provide an RJ-45 Ethernet connector.
control unit port An internal director or switch port, embedded on the CTP card, that
communicates with channels to report errors and link initialization.
CTP card See control processor card .
CUP See control unit port .
D
DB-9 connector A 9-pin serial connector type that provides connectivity to an ES-1000
Switch GBIC. Contrast with
high speed serial data connector .
default zone
A zone that contains all fabric-attached devices not configured as
members of a user-specified zone in the active zone set.
D_ID See destination identifier .
destination identifier A 3-byte field in a Fibre Channel frame header that indicates the
targeted destination (address identifier of the device N_Port) of the
transmitted frame.
director
A redundant, highly-available Fibre Channel switch with a high port
count that provides any-to-any port connectivity between devices
(nodes) connected to a switched fabric. A director transmits data
frames between nodes in accordance with the address information
provided in the associated frame headers. Directors are well suited
for use in enterprise computing environments. Contrast with
fabric
switch .
DNS See domain name system .
DNS server
For Internet and TCP/IP applications, a DNS server supplies
name-to-address translation by mapping domain names to Internet
addresses.
domain (1) A group of devices (nodes) on a network that form an entity with
resources under common control. For example, a domain can be a