GlossaryDell Model TL24iSCSIxSAS 1Gb iSCSI to SAS User’s Guide Rev.C Page 63LED - Light-emitting diode.LUN - Logical Unit Number - A LUN is a number which identifies a sub-element within a SCSI target device.This is normally used to refer to the device itself.NTP - Network Time Protocol is a protocol for synchronizing the clocks of computer systems over the IPnetwork. NTP as defined in IETF RFC 1305 is useful for synchronizing the internal clock of the computers toa common time source.RJ45 - A commonly used connector for networks.Serial Attached SCSI (SAS) - SAS is a performance improvement over traditional SCSI because SASenables multiple devices (up to 128) of different sizes and types to be connected simultaneously with thinnerand longer cables; its full-duplex signal transmission supports 3.0 Gb/s. In addition, SAS drives can be hot-plugged.Subnet-address - the subnet-address is an extension of the IP-address allowing a single IP-networkaddress to be used for multiple physical networks. Gateways and hosts using subnet-addressing divide thehost portion of the address into a subnet-identifier and host portion.Switch - a network communications device that routes packets (messages or fragments of messages)between nodes across virtual circuits.TCP/IP - Transmission Control Protocol/Internet Protocol. TCP is a protocol that insures packets aredelivered in order, error free.