10
1 Introduction to the AVM ISDN-Controller T1/T1-B
Controller T1-B has a second processor board, for a
total of 7 CPUs and 17 MB of RAM. Four CPUs are
available for additional internal tasks such as V.42bis
data compression on 30 simultaneous channels. The
AVM ISDN-Controller T1 has one processor board
with 3 CPUs and 9 MB of memory. The T1/T1-B is linked
to the PC by a high-speed serial link to a PC bus
interface card.
Fig
The AVM ISDN-Controllers T1/T1-B installation
The driver and protocol software is downloaded from
the host PC on initialization. The software is oriented
after the ISO OSI protocol layer model, and covers
Layers 1 to 3 of both the data and signalling channels.
This loadable controller software concept permits flex-
ible adaptation to new requirements without installing
new hardware or firmware, and forms the basis for
flexible adaptation to a variety of purposes and network
configurations.
The AVM ISDN-Controller T1/T1-B is equipped with
driver software in conformance with the international
standard COMMON-ISDN-API Version 2.0 (CAPI 2.0).
This driver software supports the protocols X.75 trans-
parent, HDLC transparent, X.25, ISO 8208 (X.25 DTE-
DTE) and bit-transparent. As a special feature, the
ISDN
S
2M
Interface
AVM
ISDN-Controller T1
T1 PC Interface Card
Controller
Software