Specifications

AVM Access Server – Glossary 121
Charge profile
A charge profile contains information about the duration of a connec-
tion charge interval for each time of day and for local and long-distance
dialing zones. Each profile consists of two lists of charge rates over a
24 hour period: one list applies on weekdays (Monday–Friday), the
other on weekends and (optionally) holidays.
The AVM Access Server uses charge profiles to control the inactivity
timeout for the physical ISDN connection. If a charge profile is selected
in the remote user’s or network’s inactivity timeout settings, the con-
nection is cleared down three seconds before the end of the charge in-
terval, if at that time no data has been transported for three seconds.
This ensures that optimum use is made of the charge interval. The se-
lected charge profile is also used to estimate the connection charges
incurred. The AVM Access Server then compares the charges calculated
on this basis with the user-specific and global budgets. This avoids un-
expectedly high ISDN costs.
Client
A client is a computer in a network that requests services from another
system, such as access to files or information from databases.
CLIP (Calling Line Identification Presentation)
ISDN terminal devices can transmit their line’s number over the D channel
with outgoing calls. CLIP is an ISDN feature used by the AVM Access Server
to identify incoming calls and to guard against unauthorized access. This
feature must be activated for the caller’s line by the ISDN provider. CLIP
can generally be requested when ordering an ISDN line.
Common ISDN API (CAPI)
CAPI, currently in Version 2.0, is a standardized, manufacturer-inde-
pendent interface between PC ISDN adapters and ISDN applications.
The driver software for AVM ISDN-Controllers provides the CAPI inter-
face throughout the system. Current CAPI drivers can be downloaded
free of charge from AVM’s FTP server (ftp://ftp.avm.de). The AVM
Access Server builds on the CAPI 2.0 applications interface.
Dchannel
The D channel is used to carry control information in ISDN, such as the
type of communication service requested and the numbers of the par-
ties communicating. The throughput of the D channel is 16 kbit/s for