06/29/17
ICA-202D OPERATION AND INSTALLATION MANUAL
Page 12 of 32
Simplified Block Diagram
ACTIVE
F-F
OR
AND
OR
ACTIVE
CALL
OR
OR
LISTEN
TALK
PAGE
CHANGOVER
SEQUENCER
T
ALK
, 10MS
R
ETURN FROM TALK
, 200MS
E
NABLE
T
ALK
R
ESET
S
ET
CALL_TONE_ON
PTT
PAGE_SW
PTT_SW
A-TONE_ON
CALL
MUTE_SW
SHUTOFF_SW
ACTIVATE_SW
PTT
ACTIVE_F-F_ON
~200MS
CALL TONE GENERATOR
CALL_TONE
CALL_TONE_ON
WARBLE
INTERMITTENT
CONTINUOUS
0dB, HIGH
-6dB, MEDIUM
-12dB, LOW
CALL TONE
CONTROL
CALL_SW
PTT
ACTIVE_F-F_ON
CANCEL
EDGE
LEVEL
LATCH
NON-LATCH
A-TONE
O/S
A-TONE_ON
PRIVACY
TONE TIMER
OR
PAGE
P
AGE
P
RE
-A
NNOUCE
T
ONE
OR
R
ESET
PTT
ACTIVE
PTONE_ENB_SW
~18 S
ECONDS
R
EPEATING
~200MS
ALERT TONE GENERATOR
A_TONE
0dB, HIGH
-6dB, MEDIUM
-12dB, LOW
PAGE
MUX
LINE
OUT
MUX
LINE
OUT
MUX
AMP
PAGE OUTPUT
SUM
LINE OUTPUT
OP_SOURCE
OP_SOURCE
REM_SOURCE
PAGE
TALK
LISTEN
REMOTE SPEAKER
INPUT/OUTPUT
AND
PRE-AMP
OPERATOR
MICROPHONE
OR
LINE INPUT
OP_SOURCE
SUM
A_TONE
“REMOTE
LISTEN”
LEVEL”
PWR-AMP
AND
TALK
A-TONE_ON
TALK
PAGE
M
UTE
R
EMOTE
S
PEAKER
W
HILE
P
AGING
OPERATOR
ALC
O
P
M
IC
/L
INE
G
AIN
8
7
6
2 1 0
F E
A
9
OPERATOR SPEAKER
REMOTE SPEAKER
INPUT/OUTPUT
PRE-AMP
REM_SOURCE
SUM
C_TONE
“OPERATOR
LISTEN”
LEVEL”
PWR-AMP
LISTEN
LISTEN
OP_REACH_UP_SW
OP_REACH_DWN_SW
REMOTE
ALC
R
EM
M
IC
G
AIN
8
7
6
2 1 0
F E
A
9
