Operation Manual

113 NT/MPRI – Glossary
Glossary
1TR6
1TR6 is the older German national D-channel protocol. No new ISDN
line has been installed with this protocol in Germany since December
1993. Only the European D-channel protocol DSS1 is used for new
lines.
ADSL (Asymmetric Digital Subscriber Line)
ADSL is a technology which makes high-bandwidth Internet access
possible over a normal (analog) telephone line. During downloading
data can be transmitted at up to 768 kbit/s; in the opposite direction,
up to 128 Kbit/s are possible. Dial-in connections to other ADSL users
and service indicators are not possible.
ADSL access is generally supplied along with an ISDN line (if such a
line is not yet provided). ADSL access is provided by plugging a cable
into a supplementary network adapter or into an AVM ADSL/ISDN-Con-
troller in the computer.
ARP (Address Resolution Protocol)
The Address Resolution Protocol, or ARP, is part of the TCP/IP protocol
suite, and provides dynamic mapping of IP addresses to hardware ad-
dress (MAC addresses) in a LAN. This mapping is maintained automati-
cally and is usually opaque to applications and users.
To exchange data in a TCP/IP network, the sending station must map
the destination’s IP address to its hardware address. The sending sta-
tion sends out an “ARP request” packet with the IP address of the des-
tination. All ARP-sensitive systems in the network recognize this pack-
et, and the system with the given IP address returns its hardware ad-
dress in an ARP reply packet. The sender then stores the combination
of IP address and hardware address in its ARP cache.
Authentication
Authentication is the examination of a remote system's log-on informa-
tion (name and password), for both incoming and outgoing calls. This
check secures the NT/MPRI against unauthorized access and identifies
the call destination/user if assignment of incoming calls using the D
channel number (CLI) is not enabled. The PAP and CHAP authentication
ntmpri-e.book Seite 113 Donnerstag, 28. Februar 2002 11:26 11