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Glossary
GL-2
Cisco Access Registrar 3.5 Concepts and Reference Guide
OL-2683-02
CSU/DSU
Channel Service Unit/Data Service Unit isolates your network from your exchange carrier’s network.
It also receives the timing, low-level framing information, and data passed from the termination point.
CSU/DSUs are specific to the general circuit type.
Customer
A user of an ISP or an enterprise. The provider offers the customer MPLS VPN service. The enterprise
provides the customer remote user access to various sites. In the case of ISPs, MPLS BPN provides a
scalable wholesale access/open access solution.
D
DAP
Directory Access Protocol is a heavyweight protocol that runs over a full OSI stack and requires a
significant amount of computing resources to run.
Data Source
Sets of data and their associated environments which include operating system, DBMS, and network
platforms used to access the DBMS that an application wants to access.
DHCP
Dynamic Host Configuration Protocol—a protocol that describes the service of providing and
managing IP addresses to clients on a network.
DHCP Client
The IOS DHCP client used to generate requests for host addresses and subnets for non-PPP clients.
DHCP Proxy Client
The IOS DHCP client used to request an address for a PPP user from a DHCP server.
Dial Use
Dial Use is an end-system or router attached to an on-demand PSTN or ISDN, which is either the
initiator or recipient of a call.
Digital Channel
Digital Channel is a circuit-switched communication path that is intended to carry digital information
in each direction.
DNIS
Dialed Number Information String is an indication to the receiver of a call as to what phone number
the caller used to reach it.
Driver Manager
A special library that manages communication between applications and drivers. Applications call
ODBC API functions in the driver managers which load and call one or more drivers on behalf of the
applications.
E
EAP
Extensible Authentication Protocol is a framework for a family of PPP authentication protocols,
including cleartext, challenge/response, and arbitrary dialog sequences.
C