Ericsson LBI-39055 manual I/O BOARD-TO-CALL Director Signal Descriptions Type, Input Output

LBI-39055

TABLE 10 − AUDIO PA BOARD #2-TO-CEC/IMC SIGNAL DESCRIPTIONS

TYPE

INPUT

OR

OUTPUT

USE

Patched Radio

CD/Operator Mic

Input

Output

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.

TABLE 11 − I/O BOARD-TO-CALL DIRECTOR SIGNAL DESCRIPTIONS

TYPE

On-Hook Relay

(optional)

INPUT

OR

OUTPUT

Output

USE

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:

0.6A @ 125 Vac

0.6A @ 110 Vdc

2.0A @ 30 Vdc

Handset Jack Sense

(optional) *

Off-Hook Sense *

Ground *

CD Mic

CD Receiver

Input

Input

n/a

Input

Output

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.

Active low when the CD is placed off-hook. Dry contact.

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:

-37 dBm to +8 dBm, typically -25 dBm.

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	On-Hook Relay Contacts (optional)
6
2	Handset Jack Sense (optional)
3	Off-Hook Sense
4	Ground
5	CD Mike
9
7	CD Receiver
8

DB-9 Female

Figure 12 − I/O Board CALL DIRECTOR Pin-Out

17