Lancom 1722 VoIP User Manual page 50

LANCOM 1722 VoIP – LANCOM 1724 VoIP
Chapter 2: Installation
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
DIP
1 + 2
3 + 4
5 + 6
7 + 8
9 + 10
A change to the software configuration is also necessary if the ISDN interfaces
are to be set to a different mode.
50
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 ISDN 2 (LANCOM 1722 VoIP) and/or ISDN 3 (LANCOM 1724 VoIP). As
a consequence, ISDN equipment operated at the internal ISDN bus of the
LANCOM VoIP Router can be operated without its own power supply.
Be sure to deactivate the ISDN power relay if both ISDN interfaces are
to be operated in TE mode, such as when both ISDN interfaces are
connected to an ISDN NTBA, for example. A power relay in this situ-
ation would result in a short-circuit which would damage the device
and the ISDN NTBAs!
Before altering the DIP switch settings, remove all cables from their sock-
ets.
Remove the see-through cover of the DIP switch.
We suggest that you use a screwdriver to set the DIP switch to the desired
position.
LANCOM 1722 VoIP
Meaning
ISDN 2 Rx/Tx
Ω
(100 bus termination)
Life-line support
ISDN power relay ISDN 1
> ISDN 2
ISDN 1 Rx/Tx
Ω
(100 bus termination)
Plug the cable in again and start the device.
LANCOM 1724 VoIP
Default Meaning
up (on) ISDN 4 Rx/Tx
Ω
(100 bus termination)
up (on) ISDN 3 Rx/Tx
Ω
(100 bus termination)
up (on) ISDN power relay ISDN 1
> ISDN 3
up (on) ISDN 2 Rx/Tx
Ω
(100 bus termination)
down (off) ISDN 1 Rx/Tx
Ω
(100 bus termination)
Default
up (on)
up (on)
down (off)
down (off)
down (off)