Tech Works CI Series System Planning Manual page 24

CI-MSI-22
The MSI-22 is a Microphone and Speaker Interface for our Collaborative Intercom family of products.
There can be two Microphones (One from the Microphone Input; one from the PA-BUSS Input using a PA-
MI-1)
Two Speaker outputs (One from the Speaker Output; one from the PA-BUSS output using a AS-1 or PA-
402)
MICROPHONE
CI-BUSS ALERT
PA-BUSS IN ALERT
PA-BUSS INPUT
MASTER INPUT
CI-BUSS ALERT
CI-BUSS ALERT
PA-BUSS IN ALERT
PA-BUSS INPUT
MASTER INPUT
CI-BUSS ALERT
CI-BUSS ALERT
PA-BUSS IN ALERT
CI-BUSS "SLAVE"
CI-BUSS ALERT
CI-BUSS "MASTER"
INPUT AUDIO
Basic Microphone / Speaker Interface Block Diagram (Transformers not shown for clarity)
Each input can be routed to an output or all outputs by placing routing jumpers inside the unit as desired.
The CI-BUSS interface performs the same function for additional units. The Microphone is processed
with ALC to be of constant level and passed to other Units in both directions as selected.
The ALC has
This indicator also serves as a setup indicator for adjusting the Microphone level.
10/29/2019 Tech Works CI-Series Systems Planning & Installation Manual
OR
PRE-AMP
FILTERS
LINE INPUT
TALK SW
ALWAYS
OPTO
ALERT
RCVR
PA-BUSS
INPUT
AUDIO BUFFER
ALWAYS
OR
TALK SW
LOCAL ALC
SUM
SLAVE INPUT
"LISTEN
LEVEL"
TALK SW
PA-BUSS INPUT AUDIO
ALWAYS
OR
LOCAL ALC
SUM
SLAVE INPUT
"LISTEN DUCK
LEVEL"
TALK SW
ALWAYS
OR
BUFFER SLAVE INPUT
AUDIO INPUT
OPTO
RCVR
BUFFER MASTER INPUT
an indicator
NOTCH
ALC
ALWAYS
DUCK SELECT
AMP
MUX MUX
SELECT
MUX MUX
PWR-AMP
PA-BUSS OUTPUT AUDIO
MASTER INPUT
LOCAL ALC SUM
PA-BUSS INPUT
CI-BUSS ACTIVE
SLAVE INPUT
LOCAL ALC SUM
PA-BUSS INPUT
for the
ALC OUT
PA-BUSS INPUT ALERT
PA-BUSS INPUT AUDIO
ALERT
PA-BUSS
OUTPUT
AUDIO
SPEAKER
OUTPUT
AUDIO
CI-BUSS "SLAVE"
OUTPUT
CI-BUSS ALERT
CI-BUSS "MASTER"
AUDIO OUTPUT
Threshold of
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Limiting.