Elcon NT1+2a/b - Configuration; DIP Switch Settings

4
4 Configuration
The NT1+2a/b is configured by means of DIP switches along with the DTMF signals
of a connected analogue telephone. The DTMF settings are always available and not
protected by a password.
DIP switch settings
The switch SW permits to set the basic configuration of the termination resistors at
S/T interface.
Default settings is marked with bold letters here.
Switch
Default
Acts on
Effect
SW1
ON
S/T
Receive
ON: 100 Ω parallel SR
OFF:
SW2
ON
S/T
Transmit
ON: 100 Ω parallel SX
OFF:
SW3
OFF
S/T
Receive
ON: additional 100 Ω parallel SR
OFF:
SW4
OFF
S/T
Transmit
ON: additional 100 Ω parallel SX
OFF:
The pairs SW1, SW2 and
SW3, SW4 are each
connected in parallel, so that
these combinations can be
set: 50 Ω, 100 Ω or No
Parallel Resistor.
Description of S/T interface connectors RJ45 modular jack and clamp
connector
Figure 1
1
2 3
4
1
2
3
4
1
2
3
4
100 Ohm
50 Ohm
Termination resistors
switched off
ON
OFF
ON
OFF
ON
OFF
default setting
a2 b2 a1 b1
a2 a1 b1 b2 a2 a1 b1 b2