Typical functionality of a Fritz!Box includes: • a built-in
broadband bridge: • a
DSL modem (most models) • a
cable modem (6xxx series) • a
3G or
LTE modem (68xx series) • a
fibre broadband bridge (54xx, 55xx series) • a built-in
LAN–WAN router, usually with a
network switch supporting
Fast Ethernet or, in newer models,
Gigabit Ethernet • in nearly all models, a
wireless access point: • in the
2.4 GHz radio band, in accordance with
IEEE 802.11b (11 Mbit/s),
IEEE 802.11g (54 Mbit/s) and
IEEE 802.11n (up to 450 Mbit/s) standards • in many newer models, also in the 5 GHz radio band, supporting the
IEEE 802.11a (54 Mbit/s),
IEEE 802.11n (54 Mbit/s—450 Mbit/s) and
IEEE 802.11ac (up to 1.27 Gbit/s) standards • a
PBX, particularly in the 7xxx series models: • a built-in
SIP client for internet telephony (
VoIP) • a
DECT base station to connect cordless handsets • a SIP server to connect SIP-compliant phones or software devices • support for physical phones (extensions) connected via
ISDN and/or
analog interfaces • an
answering machine and software-based
fax • in most models since 2006, a
USB port to connect external storage or printer which may also be used to connect a e.g. a
3G or
4G mobile modem • a
NAS and a
DLNA/
UPnP compliant media server in most models with newer firmware Many Fritz!Boxes offer
wireless repeater functionality which, in earlier firmware versions, was compatible with the IEEE 802.11-1999 standard
wireless distribution system before being replaced with a proprietary system in more recent firmware versions.
IPv6 support was enabled from firmware version 4.90 onwards. Fritz!Box devices operate under the control of Fritz!OS, a specialized
Linux distribution, which provides a graphical web interface for user interaction. ==Domestic versions==