22. If "Transfer Internal Code" is active, ** is placed before the 22
and the callback can be made directly from the caller list.
Transmission speed
The number of bits per second transmitted in T-Net or T-ISDN from
the PC or fax machine. Fax machines achieve up to 14.4 kbps, mo-
dems 56 kbps. In the ISDN, data and fax exchange with 64 kbps is
possible. With T-DSL, up to 8 mbps can be received and up to 768
kbps sent.
TSD
Terminal Selection Digit
TTL
TTL stands for Time to Live and describes the time during which a
data packet is sent between the individual servers before it is dis-
carded.
Twofish
Twofish was a possible candidate for the AES (Advanced Encryp-
tion Standard). It is regarded as just as secure as Rijndael (AES),
but is slower.
U-ADSL
Universal Asymmetric Digital Subscriber Line
UDP
User Datagram Protocol
Update
Update to a software program (PBX firmware). An update is the up-
dated version of an existing software product, and is indicated by a
new version number.
Upload
Data transfer during online connections, where files are transferred
from the user's PC to another PC or to a data network server.
UPnP
Universal Plug and Play
Upstream
Data transmission rate from the client to the ISP.
URL
Universal/Uniform Resource Locator
USB
Universal Serial Bus
User guidance
Electronic user guidance that takes the user through the required
functions of a terminal such as a telephone, answering machine or
fax machine step by step (menu-guided operation).
UUS1 (User to User
Signalling 1)
This function is only possible for system telephones and ISDN tele-
phones.
V.11
ITU-T recommendation for balanced dual-current interface lines (up
to 10 mbps).
Funkwerk Enterprise Communications GmbH
Glossary
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