Operation Manual

NetWAYS/ISDN – Glossary 61
Client
A client is a computer in a network that requests services
from another system, such as access to files or information
from databases.
COMMON-ISDN-API (CAPI)
CAPI is a standardized, manufacturer-independent 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/). NetWAYS/ISDN 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 parties communicating. The D-channel
throughput is 16 kbit/s for BRI lines and 64 kbit/s for PRI
(primary rate) lines. D channel information is used for ISDN
features such as charge information (AOCD) and caller ID
(CLIP). In Germany, the CLIP and AOCD services must be spe-
cially requested on ordering an ISDN line.
DSS1
Standard European ISDN D-channel protocol. All newer ISDN
lines use DSS1.
ESP (Encapsulating Security Payload)
A security protocol in the IPsec suite. ESP provides authenti-
cation of the source of a data packet, as well as encryption to
ensure the privacy.
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