Operation Manual

NT/MPRI – Glossary 120
(“Configuration / Server Settings / ISDN-Controllers”). The Outside
Line Access is then automatically prefixed to outside numbers on dial-
ing.
PAP (Passwort Authentication Protocol)
One of two protocols for PPP authentication. A name and a password
for the remote site must be configured at the site requesting authenti-
cation. The remote site must also have this name and password en-
tered in its settings. During PAP authentication, the name and pass-
word are transmitted in plain text, and the remote site checks whether
they match its own settings. If they do, the connection is set up.
Physical ISDN Connection
With a physical ISDN connection, one or more B channels are actually
set up, and charges are incurred. The physical ISDN connection is al-
ways set up in accordance with the logical ISDN connection, i.e. the ne-
gotiated connection parameters are used.
Ping (Packet InterNet Groper)
A program to test whether a host can be reached. The program sends
an ICMP query to an IP host and waits for an appropriate answer. With
the aid of the “-w” option after the “ping” command, you can specify
how many milliseconds the program should wait for an answer (time-
out). Because it can take a few seconds to set up the connection over
ISDN and for the remote site to negotiate, a timeout of 5000 ms is rec-
ommended for a ping over ISDN.
PPP (Point-to-Point-Protocol)
A data communications protocol for switched networks such as ISDN
which provides data transfer independent of specific network proto-
cols. The protocol consists of a number of standards and sub-proto-
cols. These describe the structure of transmitted data for various net-
works. The objective is to allow communications equipment from dif-
ferent manufacturers to use a uniform procedure for communication.
PPP over ISDN is described in RFC 1618.
ntmpri-e.book Seite 120 Donnerstag, 28. Februar 2002 11:26 11