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TABLE 10 − − AUDIO PA BOARD #2-TO-CEC/IMC SIGNAL DESCRIPTIONS
INPUT
OR
TYPE
OUTPUT
Patched Radio
Input
CD/Operator Mic
Output
TABLE 11 − − I/O BOARD-TO-CALL DIRECTOR SIGNAL DESCRIPTIONS
INPUT
TYPE
OUTPUT
On-Hook Relay
(optional)
Handset Jack Sense
(optional) *
Off-Hook Sense *
Ground *
CD Mic
CD Receiver
* Ground (pin 4) is common for Handset Jack Sense (pin 3) and Off-Hook Sense (pin 2). This ground is not isolated from chassis ground.
Radio audio from CIM TX channel 4. This audio is heard at the telephone.
Telephone/operator mic audio to CIM RX channel 4. This audio is heard at the radio.
OR
Normally-open relay contact (Form-A). Closure generated when the console
disconnects the CD from the CEC/IMC. Used to put CD on-hook, if an input exists.
The relay remains energized for approximately 1.2 seconds. This value is fixed in
Output
the Logic Board firmware and cannot be changed. Relay contact ratings:
Active low when a handset is plugged into the CD. This handset overrides all audio
connections to the Audio Tower. The operator talks directly to the phone via the
Input
handset instead of using the console's headset or mic/speaker. Dry contact.
Input
Active low when the CD is placed off-hook. Dry contact.
n/a
Signal ground for dry contact handset jack and off-hook sense lines.
Audio from the CD (telephone mic). This audio is heard by a radio in patch
operation, or by operator headset in normal operation. 600-ohm balanced input:
Input
Radio/operator mic audio to the CD (telephone receiver). This audio is heard by
Output
1
6
3
2
4
5
9
7
8
DB-9 Female
Figure 12 − − I/O Board CALL DIRECTOR Pin-Out
USE
USE
0.6 A @ 125 Vac
0.6 A @ 110 Vdc
2.0 A @ 30 Vdc
-37 dBm to +8 dBm, typically -25 dBm.
the telephone. 600-ohm balanced output:
-20 dBm to 0 dBm, typically -5 dBm.
On-Hook Relay Contacts (optional)
Handset Jack Sense (optional)
Off-Hook Sense
Ground
CD Mike
CD Receiver
LBI-39055
17
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