Multi Service Edge Device HL950
Administrator’s Guide
EN/LZT 108 5995 R3
Page 150 (159)
June 2003
DBCES – Dynamic Bandwidth Circuit Emulation Service
DCE – Data Communications Equipment
A device that communicates with a Data Terminal Equipment (DTE) device in RS-232C
communications.
DES – Data Encryption Standard
Is a symmetric block cipher algorithm used as a confidentiality mechanism for the encapsulating
security payload (ESP).
DHCP – Dynamic Host Configuration Protocol
DHCP is
a protocol for assigning dynamic IP addresses to devices on a network.
DLC – Data Link Connection
A DLC represents a segment of a PVC. The connection can be between an end-user device and a
network device or between one network device and another.
DMZ – Demilitarized Zone
A company that wants to host its own Internet services without sacrificing unauthorized access to its
private network uses a Demilitarized Zone. The DMZ sits between the Internet and an internal
network's line of defense, usually some combination of firewalls and bastion hosts. Typically, the
DMZ contains devices accessible to Internet traffic, such as Web (HTTP) servers, FTP servers, SMTP
(e-mail) servers and DNS servers.
DNS – Domain Name System (or Service)
DNS is an Internet service that translates domain names into IP addresses
DSL – Digital Subscriber Line
DSLAM – Digital Subscriber Line Access Multiplexor
A DSLAM card converts multiple ADLS lines into ATM traffic. For a service management
application, if the service user is connected to the ATM network through a DSLAM port, then you
provision a network access using a DSLAM attachment type.
DSR – Data Set Ready
DSU – Data Service Unit
The DSU is a device that performs protective diagnostic functions for a telecommunications line. Such
a device is required for both ends of a T1 or T3 connection, and the units at both ends must be set to
the same communications standard.
DTE – Data Terminal Equipment
A device that controls data flowing to or from a computer. The term is most often used in reference to
serial communications defined by the RS-232C standard.
DTR – Data Terminal Ready
A V-series control signal sent from the DTE to the DCE indicating that the DTE is powered and ready
to communicate. DTR can also be used for hardware flow control.