EMC Connectrix B Series Hardware Reference Manual page 88

Glossary
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.
Domain ID As applies to Departmental Switches, a unique number between 1
and 239 that identifies the switch to the fabric and is used in routing
frames. Usually automatically assigned by the switch, but can be
manually assigned.
DTE Port A data terminal equipment port capable of interfacing to a
transmission circuit through a connection to a DCE (data
communications equipment) port. DTE devices with an RS-232 (or
(EIA-232) port interface transmit on pin 3, and receive on pin 2 in a
9-pin connection (reversed in 25-pin connectors). See also DCE Port
and RS-232 Port.
DWDM Dense wavelength multiplexing. A means to concurrently transmit
more than one stream of data through a single fiber by modulating
each stream of data on to a different wavelength of light.
E
ECCN Export classification control number. A government classification of
encryption. For example, SSH is in the high-encryption category
(number 5x02) and therefore has certain restrictions regarding its
transfer.
Edge Switch A switch whose main task is to connect nodes to the fabric. See also
Core Switch.
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EMC Connectrix B Series DS-8B3 and DS-16B3 Hardware Reference Manual