First-level domain Describes the last part of a name on the Internet. For
www.t-com.de, the first-level domain is de and in this case stands
for Germany.
Flash key The flash key on a telephone is the R button. R stands for
Rückfrage (inquiry). The key interrupts the line briefly to start certain
functions such as inquiries via the PBX.
Follow-me Performance feature of a PBX for diverting calls on the destination
telephone.
Fragmentation Process by which an IP datagram is divided into small parts in order
to meet the requirements of a physical network. The reverse pro-
cess is known as reassembly.
Frame Unit of information sent via a data connection.
Frame relay A packet switching method that contains smaller packets and fewer
error checks than traditional packet switching methods such as
X.25. Because of its properties, frame relay is used for fast WAN
connections with a high density of traffic.
Freecall Telephone number. Previous service 0130. These telephone num-
bers have been switched to freecall 0800 since January 1, 1998.
FTP File Transfer Protocol
Full duplex Operating mode in which both communication partners can commu-
nicate bidirectionally at the same time.
Function keys Keys on the telephone that can be assigned telephone numbers or
network functions.
G.991.1 Data transmission recommendation for HDSL
G.991.2 Data transmission recommendation for SHDSL
G.992.1 Data transmission recommendation for ADSL. See also G.992.1 An-
nex A and G.992.1 Annex B.
G.992.1 Annex A Data transmission recommendation for ADSL: ITU-T G.992.1 Annex
A
G.992.1 Annex B Data transmission recommendation for ADSL: ITU-T G.992.1 Annex
B
G.SHDSL See G.991.2.
Glossary Funkwerk Enterprise Communications GmbH
394 bintec W1002/W1002n/W2002/WIx040/WIx065
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