2-10
Control Configuration for 2/4 Wire (+/-)DC/Ground/Tone/
(Current Loop) Keying Control Board.
Assembly #: 923051
R7:
Tx Audio
SW2:
Selects either
Local
(
-25 dBm
sensitivity;
or Land Line Current
increases clockwise).
Loop Keying.
R10:
2 Wire Rx Balance @ 600
Ω
J1:
Selects
DC
or Current
(
1mV
RF @ 1KHz, 30% Mod.)
Loop Keying operation.
R10 adjusted for
minimum
J2:
Selects either
Land Line
amplitude
at C6/R4 junction.
(L/L)
or Single Line (S/L)
R22:
Keying Tone
and +/- DC or Ground
(
-30 dBm
sensitivity;
keying operation.
decreases clockwise).
J3:
Selects
Tone
and/or
+/- DC
R25:
Rx Audio
Keying enable or disable.
(
-10 dBm
output level;
J6:
Selects between
Internal
increases clockwise).
or External Current loop
R44:
Time Out Timer
keying (
ICL
/ECL).
(15 to 300 sec.;
J7:
Keying timer
90 sec.
Nominal;
Enable/
Disable
.
increases clockwise).
J4:
Input Connector.
SW1:
Selects either
2 Wire
J5:
Output Connector.
or 4 Wire operation.
NOTE: Bold Italics indicate Factory default configurations.
Figure 2-2 Line Interface/Remote Control Board P/N 923051-1
