IBM SAN16B-2 User Guide - Page 81

ROM. See read only memory. route. As applies to a fabric, the communication path between two switches. Can also apply to the specific path taken by an individual frame, from source to destination. See also Fibre Channel shortest path first. routing. The assignment of frames to specific switch ports, according to frame destination. R_RDY. See receiver ready. RR_TOV. See resource recovery timeout value. RS-232 port. An older standard for a port that has been replaced by EIA/TIA-232-E. Used to connect data terminal equipment (DTE) and data communications equipment (DCE) devices for communication between components, terminals, and modems. See also DB-9 connector, DCE port, and DTE port. RSCN. See registered state change notification. rw. Read-write. S SAN. See storage area network. SC. Standard connector. SCSI. See small computer systems interface. SCSI Enclosure Services (SES). A subset of the small computer systems interface (SCSI) protocol used to monitor temperature, power, and fan status for enclosure devices. SDRAM. See synchronous dynamic random access memory. Secure Fabric OS. An optionally-licensed software product that runs on top of the Fabric OS and provides customizable security restrictions through local and remote management channels on a switch. secure sockets layer (SSL). A security protocol that provides communication privacy. SSL enables client/server applications to communicate in a way that is designed to prevent eavesdropping, tampering, and message forgery. sequence. A group of related frames transmitted in the same direction between two node ports (N_ports). service rate. The rate at which an entity can service requests. See also request rate. SES. See SCSI Enclosure Services. SFP. See small form-factor pluggable. short wavelength (SWL). A type of fiber optic cabling that is based on 850 mm lasers and supports 1.0625 Gbps link speeds. Can also refer to the type of gigabit interface converter (GBIC) or small form-factor pluggable (SFP). See also long wavelength. SID. The 3-byte source ID of the originator device, in the 0xDomainAreaALPA format. SID-DID. Source identifier-destination identifier. SIMMS. Single in-line modules. simple name server (SNS). 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. SNS is defined by Fibre Channel standards and exists at a well-known address. Can also be referred to as directory service. See also Fibre Channel service. simple network management protocol (SNMP). In the Internet suite of protocols, a network management protocol that is used to monitor routers and attached networks. SNMP is an application layer protocol. Information on devices managed is defined and stored in the application's Management Information Base (MIB). single mode. The fiber optic cabling standard that corresponds to distances of up to 10 km (6.214 mi) between devices. small computer systems interface (SCSI). A parallel bus architecture and a protocol for transmitting large data blocks up to a distance of 15-25 m (49-82 ft). small form-factor pluggable (SFP). An optical transceiver used to convert optical and electrical signals between optical fiber cables and switches. SNMP. See simple network management protocol. SNMPv1. The original standard for SNMP, now labeled v1. SNS. See simple name server. SOF. Start-of-frame. SSL. See secure sockets layer. standard translative mode. A hardware translative mode that allows public devices to communicate with private devices across the fabric. See also hardware translative mode and QuickLoop mode. storage. A device used to store data, such as a disk or tape. storage area network (SAN). A network of systems and storage devices that communicate using Fibre Channel protocols. See also fabric. subordinate switch. All switches in the fabric other than the principal switch. See also principal switch. Glossary 59