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5 Hardware Structure of the AVM ISDN-Controller T1/T1-B
Fig. Structure of the ISDN-Controller
Two transputers control the B channels and D channel
by means of the Munich32 and the HSCX. The third
CPU is the applications transputer. Furthermore, the
AVM ISDN-Controller T1-B contains another circuit
board, called a booster board, in addition to the T1
motherboard. The booster board carries four addi-
tional T450 transputers and eight megabytes of RAM,
which can be used for applications such as controller-
based V.42bis data compression or DTMF functions.
The T1 housing can accommodate up to three booster
boards.
5.2 The Link Adapter
The link adapter, a plug-in card for the PC’s ISA bus slot,
forms the interface between the host PC and the T1
controller. Data communication between the ISDN-
Controller T1/T1-B and the host PC takes place at a
rate of 20 Mbit/s. Up to four link adapter cards can be
installed in one PC, so that each host PC can run up to
four ISDN-Controller T1s.
to host PC
Application and
control logic
Booster board
ISDN interface
S
2M