Bus termination, life-line support and power relay

The hardware function modes of the ISDN interfaces are set by DIP switches on the underside of the LANCOM VoIP Router.

• Bus termination is obligatory with an ISDN interface in NT mode. Bus termination is generally deactivated for ISDN interfaces in TE mode. If the LANCOM VoIP Router is the last device at a longer ISDN bus and this itself is not terminated, it may be advantageous to activate the bus termination for an ISDN interface in TE mode.
  Note: The supplied adapter must be used if a connection is to be made to an ISDN interface which is set differently to its default settings. This adapter serves to cross-over the contacts in the ISDN interface. Not using the adapter can cause damage to both the LANCOM VoIP Router and to the devices connected with it!
• If life-line support is activated, the interfaces ISDN 1 and ISDN 2 are bridged if the device is unavailable due to a power outage or if the ISDN 2 interface is switched off (default: on). The life-line support is used when the device is connected to an external ISDN line over a TE interface with the simultaneous operation of ISDN terminal devices at the internal ISDN connection of an NT interface. If bridged, the ISDN devices can then use the external ISDN bus directly. To activate life-line support, all four DIP switches (3 to 6) must be up; to deactivate, all four DIP switches must be down.
  Note: Life-line support is to be deactivated when both ISDN interfaces are to be operated in the same mode, i.e. as two TE or two NT interfaces. The interfaces are not to be bridged in case of power failure when being operated in this manner!
• The ISDN power relay means that the bus voltage of an external ISDN bus at ISDN 1 is switched through to the terminal equipment connected to another ISDN bus. As a consequence, ISDN equipment operated at the internal ISDN bus of the LANCOM VoIP Router can be operated without its own power supply.