Elcon NT1+2a/b, Руководство пользователя

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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