Configuring the ISDN connections

The ISDN connections on the hybird 120 can be operated as S0 NT, S0 TE . There are two slots with a mini PCB beneath the removable faceplate and beneath the flap underneath it, for switching between the separate operating modes:

You can set the operating mode by plugging in the mini module belonging to each connection (ISDN 1 above, ISDN 2 below) in such a way that, when viewed from above, you can see the label you want (for guidance: the connections on the device are located on the bottom). Also, adjacent to the slots for switching over the operating mode you will find two switch blocks for switching the terminators on and off. In its ex works state, the terminators for both ISDN connections are active.

NT= ISDN Internal (S0)

TE = ISDN External

If the mini PCB is inserted the wrong way, you will not see the ISDN port in the web-interface.

Description: Enter a user-defined description of the ISDN interface.

Name: Shows the name of the ISDN interface.

Access Configuration: Select whether the ISDN interface will be operated as a point-to-multipoint connection or as a point-to-point connection.

Permanent Layer 2 Activation: This function (also known as permanent monitoring) constantly monitors the functionality and transmission quality of an external ISDN connection. For this purpose, the system is in permanent contact with your network operator's exchange. If the exchange does not keep the ISDN layer 2 permanently enabled, the system can initiate the repeated establishment of layer 2.

ISDN Synchronisation: When an external device (e. g. GSM gateway) is connected to an external point-to-point ISDN access in the system, the external device's signal can disturb the synchronisation in the ISDN signal. Only if such a disturbance occurs should you switch off the layer 1 synchronisation.