The degradation of a signal caused by exposure to environmental electricity or magnetism.
Electro-Optical Repeater (EOR)
A type of semiconductor optical amplifier (SOA).
Enhanced IDE (EIDE)
The common term for ATA-2.
Enterprise Systems Connection (ESCON)
A proprietary channel architecture used by IBM mainframes to access storage.
Erbium-Doped Fiber Amplifier (EDFA)
A type of in-fiber optical amplifier that amplifies wavelengths in the WDM window.
A network specification published by Digital Equipment Corporation, Intel, and Xerox. Ethernet II evolved from Ethernet, which was originally created by Bob Metcalfe while working at Xerox PARC. Ethernet II is sometimes called DIX, DIX Ethernet, or Ethernet DIX. DIX stands for Digital, Intel, and Xerox.
The system used by Ethernet and Ethernet II to assigned a unique numeric identifier to each OSI network layer protocol. EtherType is equivalent in function to the destination SAP (DSAP) used by IEEE 802.3.
The highest level FC transmission construct. An exchange is composed of sequences. Each sequence is composed of one or more frames. Each SCSI task maps to a single FC Exchange.
exchange error policy
The Fibre Channel policy that determines how the exchange recipient will handle frame and sequence errors. The exchange originator specifies the error policy in the first frame of each new exchange.
Exchange Status Block (ESB)
A small area in memory used to maintain the state of each FC exchange.
See SCSI-3 EXTENDED COPY.
An FC-SAN that spans a long distance by leveraging one of the technologies defined in the ANSI T11 FC-BB specification series.
Extended Link Service (ELS)
Special Fibre Channel procedures and frame payloads that provide advanced low-level networking functions.
A set of contiguous storage blocks. Multiple extents can be concatenated and presented to an application as a single logical volume. The individual extents of a concatenated logical volume do not need to be contiguous and can reside on a single physical disk or on physically separate disks. Data blocks are written to a single extent until it fills. Data blocks are then written to the next extent in the logical volume until it fills. When the last extent is filled, the logical volume is full.
Exterior Gateway Protocol (EGP)
Any of the routing protocols commonly used between Autonomous Systems.