to-point. It is used to connect a PBX. A main phone number and a
number block are issued. Each of the numbers in the number block
is called a direct dial exception. (Example: Main number 1234, num-
ber block: 1 - 99, numbers of the individual extensions: 1234-1,
1234-2, 1234-3, …)
Direct dialling range See number block in Point-to-point ISDN access and Direct dial-in
(VoIP)
DNS The Domain Name System (DNS) is used to convert the domain
name (e. g. www.example.org) to an IP address (name resolution).
Domain A domain is a contiguous sub-set of the DNS (e. g. example.org).
Downstream The gateway receives the data from a higher-level network and for-
wards it to its connected network.
DSA The Digital Signature Algorithm (DSA) is used to create digital sig-
natures and encrypt data packets. Signatures can be used to verify
changes made to the information in the data packet. DSA is used for
public-key cryptography (IPSec). See also RSA. Key generation is
quicker with DSA than with RSA, but key processing is slower.
DSCP Data packets can be marked with a Differentiated Services Code-
point (DSCP). DSCP values classify data packets in such a way that
important packets can be routed through the network more quickly.
See also QoS.
DSL modem See Modem.
DSS1 Digital Subscriber Signalling System No. 1 (DSS1) is a signalling
protocol for the D channel in the ISDN. It is also known as Euro
ISDN.
DTIM A Delivery Traffic Indication Message informs the clients that multic-
ast or broadcast data is available at the access point.
Dynamic IP address In contrast to a static IP address, a dynamic IP address is assigned
temporarily by DHCP. Network components such as the web server
or printer usually have static IP address, while clients such as note-
books or workstations usually have dynamic IP addresses.
DynDNS A DynDNS provider can be used to link a domain name with a dy-
namically changing IP address.
Encapsulation Encapsulation of data packets is a particular protocol to transmit the
data packets in a network. See also VPN.
Glossary bintec elmeg GmbH
524 bintec RS Series
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