Firewall, Dyndns – Siemens Gigaset C450 IP User Manual

Page 81

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80

Glossary

Gigaset C450 IP / Greek eng / A31008-M1713-T151-2-8U19 / glossary.fm / 19.9.06

Ve

rs

ion 4,

16

.09.

2005

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

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 in certain time inter-

vals.
See also: Static IP address

DynDNS

Dynamic DNS

DNS is used to assign domain names

and IP addresses. For Dynamic IP

Addresses this service is now

enhanced with "Dynamic DNS". This

permits the use of a PC with a changing

IP address as a Server on the Internet.

DynDNS ensures that a service in the

Internet can always be addressed under

the same Domain name irrespective of

the current IP address.

E

ECT

Explicit Call Transfer

Participant A calls Participant B. He puts

the connection on hold and calls Partic-

ipant C. Rather than connect everyone

in a three-party conference, A now

transfers Participant B to C and hangs

up.

EEPROM

Electrically Eraseable Programmable Read Only

Memory

Your phone's storage chip with fixed

data (e.g. user-specific device settings

made at the factory) and automatically

saved data (e.g. caller list entries).

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

System of billing for an Internet con-

nection. 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.

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