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Glossary
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Extension number
An extension is an internal number for a terminal or subsystem. In
point-to-point ISDN accesses, the extension is usually a number
from the extension numbers range assigned by the telephone pro-
vider. In point-to-multipoint connections, it can be the MSN or a part
of the MSN.
Extension numbers
(direct dialling range)
range
Fall Back: Priority of
The priority of the Internet provider entries is defined by the se-
the Internet provider
quence in which they are entered in the list. The first entry of a DSL
entries
connection is the standard access. If a connection cannot be set up
via the standard access after a predefined number of attempts,
setup is attempted using the second entry then subsequent entries.
If the final entry in the list does not enable a connection to be set up
successfully, the operation is terminated until a new request is
made. When fall back occurs and all other ISPs can only be reached
by dialup connections, both B channels may be occupied. If channel
bundling is used, you cannot be reached for the duration of this con-
nection.
Fax
Abbreviation of telefax.
FHSS, Frequency
In a FHSS system, the frequency spread is achieved through con-
Hopping Spread
stantly changing frequencies based on certain hopping patterns. In
Spectrum
contrast to DSSS systems, hopping patterns are configured, not the
frequency. The frequency changes very frequently in one second.
File transfer
Data transmission from one computer to another, e.g. based on the
Eurofile transfer standard.
Filter
A filter comprises a number of criteria (e.g. protocol, port number,
source and destination address). These criteria can be used to se-
lect a packet from the traffic flow. Such a packet can then be
handled in a specific way. For this purpose, a certain action is asso-
ciated with the filter, which creates a filter rule.
Firewall
Describes the whole range of mechanisms to protect the local net-
work against external access. Your gateway provides protection
mechanisms such as NAT, CLID, PAP/CHAP, access lists, etc.
Firmware
Software code containing all a device's functions. This code is writ-
ten to a PROM (programmable read only memory) and is retained
there, even after the device is switched off. Firmware can be up-
dated by the user when a new software version is available
(firmware upgrade).
Funkwerk Enterprise Communications GmbH
R1xxx/R3xxx/R4xxx
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