LANCOM 1722 VoIP – LANCOM 1723 VoIP – LANCOM 1724 VoIP – LANCOM 1823 VoIP
Chapter 12: Configuring the ISDN and analog interfaces in detail
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12 Configuring the ISDN and analog interfaces
in detail
12.1
ISDN interface in NT or TE mode
Depending on the model, the ISDN interfaces can be used for connecting to
an ISDN exchange line or for connecting up ISDN terminal equipment. The
interfaces are switched into the NT or TE mode for this:
ISDN TE interface ("external ISDN connection"): An ISDN interface in TE
mode for connection to the ISDN bus of an upstream ISDN PBX or to an
ISDN NTBA. This ISDN interface can be used for backup connections over
ISDN or as a dial-in interface for remote stations.
With the models LANCOM 1723 VoIP and LANCOM 1823 VoIP, the
ISDN2 interface can be switched into TE mode, but it must not be con-
nected to the telephone network (NTBA), either directly or indirectly
via a PBX (by means of relay/emergency switching)!
ISDN NT interface ("internal ISDN connection"): With its ISDN interface in
NT mode, the LANCOM VoIP Router itself provides an internal ISDN bus.
This ISDN interface can be used to connect ISDN PBXs or ISDN telephones.
The factory settings have the ISDN interfaces marked with
⌧
set to TE mode
and the ISDN interfaces marked with
set to NT mode. These ISDN settings
can be altered according to your requirements:
Multiple TE interfaces provide, for example, all available B channels as a
backup or for dial-in.
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 sup-
port 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 LANCOM VoIP
Router and to the devices connected with it!
