Technical data

Glossary-16 Brocade SilkWorm 4100 Hardware Reference Manual
Publication Number: 53-0000563-02
IOD In-order delivery. A parameter that, when set, guarantees that frames are either delivered in order or
dropped.
IP Internet Protocol. The addressing part of TCP.
IPI Intelligent Peripheral Interface.
IQN iSCSI qualified name.
ISC Internet Software Consortium.
iSCSI Internet Small Computer Systems Interface. A protocol that defines the processes for transferring block
storage applications over TCP/IP networks by encapsulating SCSI commands into TCP and
transporting them over the network via IP.
iSCSI Gateway
Service
The Brocade multiprotocol SAN routing service that maps the FCP protocol to the IP transport. This
service projects iSCSI hosts onto the backbone fabric of a gateway switch.
ISL Interswitch link. A Fibre Channel link from the E_Port of one switch to the E_Port of another. See also
cascade, E_Port.
ISL oversub-
scription ratio
The ratio of the number of free ports (non-ISL) to the number of ISLs on a switch.
isolated
E_Port
An E_Port that is online but not operational due to overlapping domain IDs or nonidentical parameters
(such as E_D_TOVs). See also E_Port.
ISP Internet service provider.
IU Information unit. A set of information as defined by either an upper-level process protocol definition or
upper-level protocol mapping.
J
Jaycor A brand of host bus adapter.
JBOD "Just a bunch of disks." Indicates a number of disks connected in a single chassis to one or more
controllers. See also RAID.
jitter A deviation in timing for a bit stream as it flows through a physical medium.
K
K28.5 A special 10-bit character used to indicate the beginning of a transmission word that performs Fibre
Channel control and signaling functions. The first seven bits of the character are the comma pattern. See
also comma.
key A string of data (usually a numeric value) shared between two entities and used to control a
cryptographic algorithm. Usually selected from a large pool of possible keys to make unauthorized
identification of the key difficult. See also key pair.