HP StorageWorks 2/64 HP StorageWorks Fabric OS 5.x Master Glossary (AA-RW7NA-T - Page 8

datagram A Class 3 Fibre Channel service that allows data to be sent quickly to devices attached to the fabric, without receipt confirmation. data word A type of transmission word that occurs within frames. The frame header, data field, and CRC all consist of data words. See also frame, ordered set, and transmission word. DCC Direct cable connection. A type of connection that does not require network interface cards (NICs), making it relatively inexpensive and simple; however, it provides a limited connection between two PCs, and the data transfer rate is slower than with a true LAN. DCE Data Communications Equipment. Usually refers to a modem. dedicated simplex A connection method that permits a single N_Port to simultaneously initiate a session with one N_Port as an initiator and have a separate Class 1 connection to another N_Port as a recipient. defined zone configuration The complete set of all zone objects defined in the fabric. Can include multiple zone configurations. See also effective zone configuration, enabled zone configuration, and zone configuration. deskew Related to the HP Trunking feature. The time difference between traffic traveling over each ISL other than the shortest ISL in the group and traffic traveling over that shortest ISL. The deskew number corresponds to nanoseconds divided by 10. The firmware automatically sets the minimum deskew value of the shortest ISL to 15. DH-CHAP Diffie-Hellman Challenge-Handshake Authentication Protocol. An implementation of CHAP using Diffie-Hellman encryption. See also CHAP. DHCP Dynamic Host Configuration Protocol. Provides a way to automate and manage the network configuration of desktop computers and other network devices that use the TCP/IP protocol. DHCPD Dynamic Host Configuration Protocol daemon. D_ID Destination identifier. A 3-byte field in the frame header, used to indicate the address identifier of the N_Port to which the frame is headed. digital certificate An electronic document issued by a CA (certificate authority) to an entity, containing the public key and identity of the entity. Entities in a secure fabric are authenticated based on these certificates. See also authentication, CA, and public key. director The HP StorageWorks Core Switch 2/64, SAN Director 2/128, or 4/256 SAN Director. disparity The proportion of ones and zeroes in an encoded character. Neutral disparity means an equal number of each, Positive disparity means a majority of ones, and Negative disparity means a majority of zeroes. DLS Dynamic load-sharing. Dynamic distribution of traffic over available paths. Allows for recomputing of routes when an Fx_Port or E_Port changes status. DMTF Distributed Management Task Force. An organization that promotes the development of management standards for enterprise and Internet environments. Its purpose is to allows the exchange of management information in order to develop multi-vendor interoperability. 8 Glossary