LBI-39055
17
TABLE 10
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AUDIO PA BOARD #2-TO-CEC/IMC SIGNAL DESCRIPTIONS
TYPE
INPUT
OR
OUTPUT
USE
Patched Radio
Input
Radio audio from CIM TX channel 4. This audio is heard at the telephone.
CD/Operator Mic
Output
Telephone/operator mic audio to CIM RX channel 4. This audio is heard at the radio.
TABLE 11
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I/O BOARD-TO-CALL DIRECTOR SIGNAL DESCRIPTIONS
TYPE
INPUT
OR
OUTPUT
USE
On-Hook Relay
(optional)
Output
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 the Logic Board firmware and cannot be changed. Relay contact ratings:
0.6 A @ 125 Vac
0.6 A @ 110 Vdc
2.0 A @ 30 Vdc
Handset Jack Sense
(optional) *
Input
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 handset instead of using the console’s headset or mic/speaker. Dry contact.
Off-Hook Sense *
Input
Active low when the CD is placed off-hook. Dry contact.
Ground *
n/a
Signal ground for dry contact handset jack and off-hook sense lines.
CD Mic
Input
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:
-37 dBm to +8 dBm, typically -25 dBm.
CD Receiver
Output
Radio/operator mic audio to the CD (telephone receiver). This audio is heard by
the telephone. 600-ohm balanced output:
-20 dBm to 0 dBm, typically -5 dBm.
* Ground (pin 4) is common for Handset Jack Sense (pin 2) and Off-Hook Sense (pin 3). This ground is not isolated from chassis ground.
1
2
3
4
5
6
7
8
9
On-Hook Relay Contacts (optional)
CD Receiv er
CD Mike
Ground
Off-Hook Sense
Handset Jack Sense (optional)
DB-9 Female
Figure 12
−−
I/O Board
CALL DIRECTOR
Pin-Out
