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2 Hardware Installation
2.1.1 Installing Several PC Interface Cards
In order to operate several AVM ISDN-Controller
T1/T1-Bs in one computer, you must first assign a
unique number to each PC interface card. This number
is required so that each card can be addressed and
initialized unambiguously. The number for the second
and each succeeding ISDN-Controller must be as-
signed by setting the DIP switches found on the PC
interface card (see illustration below.
The DIP switches are numbered from right to left:
Fig.
Positions and significance of the DIP switches
The binary number of the card corresponds to the
positions of the DIP switches 1.1 to 1.4. The factory
setting is 0. The card number for any given combination
of switch settings is calculated as follows:
2
3
*SW1.4 + 2
2
*SW1.3 + 2*SW1.2 + SW1.1
where the ON position of each DIP switch has a value
of 1 and the OFF position a value of 0.
Before installing PC interface cards for additional ISDN-
Controllers, set each card to a number not yet used.
Then proceed to install each card as described above
under “Installing the PC Interface Card”.
1
2
3
4
OFF ( OFF = 0)
ON (ON = 1)
2
0
2
1
2
2
2
3
SW1