EMC Connectrix B Series Hardware Reference Manual page 87

Glossary
Credit As applies to Fibre Channel, the number of receive buffers available
for transmission of frames between ports. See also BB_Credit and
EE_Credit.
Cut-through A switching technique that allows the route for a frame to be selected
as soon as the destination address is received. See also Route.
D
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.
DAS Direct attached storage.
Data Word 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.
DB-9 Connector A 9-pin version of the RS-232C port interface. May be either the male
or female interface. See also RS-232 Port.
dBm, dBW
Logarithmic units of power used in electronics. Indicates signal
strength in decibels above the reference level, which is 1 milliwatt for
dBm, and 1 watt for dBW. An increase of 10 dBm or 10 dBW
represents a 10-fold increase in power.
DCE Port A data communications equipment port capable of interfacing
between a DTE (data terminal equipment) port and a transmission
circuit. DTE devices with an RS-232 (or EIA-232) port interface
transmit on pin 3, and receive on pin 2. See also DTE Port and RS-232
Port.
Defined Zone The set of all zone objects defined in the fabric. May include multiple
Configuration zone configurations. See also Zone Configuration.
Device A disk, a RAID, or an HBA.
Device Connection Enables organizations to bind an individual device port to a set of one
Controls or more switch ports. Device ports are specified by a WWN and
typically represent HBAs (servers). See also Access Control List.
DHCP Dynamic Host Configuration Protocol.
g-7
EMC Connectrix B Series DS-8B3 and DS-16B3 Hardware Reference Manual