EMC Connectrix B Series Hardware Reference Manual page 106

Glossary
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.
Datagram A Class 3 Fibre Channel service that allows data to be sent quickly to
devices attached to the fabric, with no confirmation of receipt.
DCE Data Communications Equipment; usually refers to a modem.
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 DWDM.
Dedicated Simplex A means that permits a single N_Port to simultaneously initiate a
session with another N_Port as an initiator, and have a separate Class
1 connection to another N_Port as a recipient.
Defined Zone The set of all zone objects defined in the fabric. May include multiple
Configuration zone configurations. See also Zone Configuration.
DHCP Dynamic Host Configuration Protocol.
DHCPD Dynamic Host Configuration Protocol daemon.
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, Public Key.
Disparity The relationship of ones and zeros 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 zeros.
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.
Domain Controller A domain controller (or embedded port) communicates with and gets
updates from other switches' embedded ports. The well-known
address is fffcdd, where dd = domain number.
g-8
Connectrix B Series XPath OS AP-7420B Hardware Reference Manual