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2. Setting up the KIRK ISDN Interface Card
The KIRK ISDN Interface Card must be installed in Slot 0 (closest to AC main plug).
Please refer to the KIRK ISDN Interface Card Installation Guide for more information about
the installation of the KIRK ISDN Interface Card.
The KIRK ISDN Interface Card is connected to the PBX/Network whit a RJ45 plug and
the connection is as follows:
3: RxA
4: TxA
5: TxB
6: RxB
The PBX/Network must be set to Master whit Layer2 CRC check turned on.
The default impedance of the KIRK ISDN Interface Card is: 120 Ω.
2.1 Changing Impedance of the KIRK ISDN Interface Card
If your PBX/Network is using a different impedance than 120 Ω, you can change the
impedance of the KIRK ISDN Interface Card using the jumpers (JP) on the card. See table
below.
JP1, JP2 and JP3 is used to select receive line impedance = 120/100/75 ohms.
Impedance JP1 JP2 JP3
120 No jumper No jumper No jumper
100 2 – 3 1 - 2 2 - 3
75 1 – 2 2 - 3 1 - 2
JP4
J5
