Cisco Systems 9124E Request rate, Route, Routing, Sequence, Service rate, Single mode, Tenancy

R_A_TOV	Resource allocation time-out value. The maximum time a frame can be delayed in the
	fabric and still be delivered.
RAID	Redundant Array of Independent Disks. A collection of disk drives that appear as a
	single volume to the server and are fault tolerant through mirroring or parity checking.
request rate	The rate at which requests arrive at a servicing entity.
route	With respect to a fabric, the communication path between two switches. May also
	apply to the specific path taken by an individual frame from source to destination.
routing	The assignment of frames to specific switch ports according to frame destination.
RR_TOV	Resource recovery time-out value. The minimum time a target device in a loop waits
	after a LIP before logging out a SCSI initiator.
RSCN	Registered state change notification. A switch function that allows notification of fabric
	changes to be sent from the switch to the specified nodes.
SAN	Storage area network. A network of systems and storage devices that communicate
	using FC protocols.
SDRAM	Synchronous dynamic random access memory. The main memory for a switch. See also
	switch.
sequence	A group of related frames transmitted in the same direction between two N_ports.
service rate	The rate at which an entity can service requests.
single mode	The fiber optic cabling standard that corresponds to distances up to 10 km between
	devices.
SNMP	Simple Network Management Protocol. An Internet management protocol that uses
	either IP for network-level functions and UDP for transport functions, or TCP/IP for both.
	SNMP can be made available over other protocols (such as UDP/IP) because it does
	not rely on the underlying communication protocols. See also MIB,trap (SNMP).
SNS	Simple Name Server. A switch service that stores names, addresses, and attributes for
	up to 15 minutes, and provides them as required to other devices in the fabric. May
	also be referred to as a directory service.
switch	Hardware that routes frames according to FC protocol and is controlled by software.
switch port	A port on a switch. Switch ports can be E_Ports, F_Ports, or FL_Ports.
SWL	Short wavelength. A type of fiber optic cabling that is based on 850 mm lasers and
	supports link speeds up to 2 Gb/s. May also refer to the type of transceiver.
tenancy	The time span that begins when a port wins arbitration in a loop and ends when the
	same port returns to the monitoring state. Also called loop tenancy.
throughput	The rate of data flow achieved within a cable, link, or system. Usually measured in bits
	per second (b/s).

62 Glossary