HP StorageWorks 2/64 HP StorageWorks Fabric OS 5.x Command Reference Guide (AA - Page 814

private loop An arbitrated loop that does not include a participating FL_Port. private loop device A device that supports a loop and can understand 8-bit addresses but does not log in to the fabric. private NL_Port An NL_Port that communicates only with other private NL_Ports in the same loop and does not log in to the fabric. protocol A defined method and set of standards for communication. Determines the type of error-checking, the data-compression method, how sending devices indicate an end of message, and how receiving devices indicate receipt of a message. pstate Port State Machine. PSU Power supply unit. public device A device that supports arbitrated-loop protocol, can interpret 8-bit addresses, and can log in to the fabric. public key The public half of a key pair. See also key, key pair. public key cryptography A type of cryptography that uses a key pair, with the two keys in the pair called at different points in the algorithm. The sender uses the recipient's public key to encrypt the message, and the recipient uses the recipient's private key to decrypt it. See also key pair, "PKI". public loop An arbitrated loop that includes a participating FL_Port and can contain both public and private NL_Ports. public NL_Port An NL_Port that logs in to the fabric, can function within either a public or a private loop, and can communicate with either private or public NL_Ports. QLA A type of Fibre Channel controller. QLFA QuickLoop Fabric Assist. Arbitrated-loop technology. QoS Quality of service. quad A group of four adjacent ports that share a common pool of frame buffers. queue A mechanism for each AL_PA address that allows for collecting frames prior to sending them to the loop. QuickLoop An HP software product that allows multiple ports on a switch to create a logical loop. Devices connected via QuickLoop appear to each other as if they are on the same arbitrated loop. QuickLoop Mode Allows initiator devices to communicate with private or public devices that are not in the same loop. R_A_TOV Resource allocation timeout value. The maximum time a frame can be delayed in the fabric and still be delivered. See also E_D_TOV, RR_TOV. R_CTL Route control. The first 8 bits of the header, which defines the type of frame and its contents. R_RDY Receiver ready. A primitive signal indicating that the port is ready to receive a frame. R_T_TOV Receiver transmitter timeout value, used by receiver logic to detect loss of synchronization between transmitters and receivers. radius The greatest distance between any edge switch and the center of a fabric. A low-radius network is better than a high-radius network. 814 Glossary