Swyx SwyxConnect 1722, User Manual

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2-12 Configuring the ISDN and analog interfaces
• With multiple NT interfaces, for example, a downstream ISDN
PBX can be provided with all available B channels.
Depending on the combination of ISDN interfaces in TE and NT
mode, the hardware must be set up with the functions for bus
termination, life-line support and power relay, and the software must
be set up with the appropriate protocol. The setting for the protocol
allows for the type of ISDN connection to be used (point-to-
multipoint or point-to-point).
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 Swyx VoIP Router
and to the devices connected with it!
2.5.2 Bus termination, life-line support and power supply
The hardware function modes of the ISDN interfaces are set by DIP
switches on the underside of the device.
• Bus termination is obligatory with an ISDN interface in NT
mode.
Bus termination is generally deactivated for ISDN interfaces in
TE mode. If the Swyx VoIP Router is the last device at a longer
ISDN bus and this itself is not terminated, it may be advantage-
ous to activate the bus termination for an ISDN interface in TE
mode.
Not including
SwyxConnect 1724 • 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 SwyxConnect 1722 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.
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!