Siemens Gigaset S675IP User Manual page 143

Glossary
DSLAM
Digital Subscriber Line Access Multiplexer
The DSLAM is a switch cabinet in an
exchange at which all subscriber con-
nectors converge.
DTMF
Dual Tone Multi-Frequency
Another description for dual tone
multi-frequency dialling.
Dynamic IP address
A dynamic IP address is assigned to a
network component automatically via
DHCP. The dynamic IP address for a
network component can change every
time it registers or at certain time inter-
vals.
See also: Static IP address
DynDNS
Dynamic DNS
Domain names and IP addresses are
realised via DNS. For Dynamic IP
addresses this service is now
enhanced with "Dynamic DNS"
(DynDNS). This permits the use of a
network component with a dynamic IP
address as a Server on the Internet.
DynDNS ensures that a service can
always be addressed on the Internet
under the same Domain name irre-
spective of the current IP address.
E
ECT
Explicit Call Transfer
Participant A calls participant B. He
puts the connection on hold and calls
participant C. Rather than connect eve-
ryone in a three-party conference, A
now transfers participant B to C and
hangs up.
EEPROM
Electrically Erasable Programmable Read Only
Memory
Memory building block in your phone
with fixed data (e.g. default and cus-
tomised settings) and data saved auto-
matically (e.g. entries to the list of call-
ers).
142
Ethernet network
Wired LAN.
F
Firewall
You can use a firewall to protect your
network against unauthorised external
access. This involves combining various
measures and technologies (hard and/
or software) to control the flow of data
between a private network you wish to
protect and an unprotected network
(e.g. the Internet).
See also: NAT.
Firmware
Device software in which basic infor-
mation is saved for the functioning of a
device. A new version of the firmware
can be loaded into the device's memory
(firmware update) to correct errors or
update the device software.
Flat rate
Billing system for an Internet connec-
tion. The Internet provider charges a
set monthly fee. There are no addi-
tional charges for the duration of the
connection or number of connections.
Fragmentation
Data packets that are too big are split
into smaller packets (fragments) before
they are transferred. They are put
together again when they reach the
recipient (defragmented).
Full duplex
Data transmission mode in which data
can be sent and received at the same
time.