Ericsson LBI-39055 manual Call Director if equipped, Equipment Room Grounding

LBI-39055

PA Board(s). See Table 9 for details. All relay connections are isolated from ground.

"RELAY 1" contacts at the I/O Board close when the console is keyed (PTTed). Audio PA Board #1 "RELAY 1" contacts toggle open/closed at an <Alt><F9> keystroke from the dispatcher keyboard and the RELAY 2 contacts close (momentarily action) while <Alt><F10> is depressed at the dispatcher keyboard. The other relays are not supported by software.

TABLE 9 − RELAY CONNECTIONS

	TERMINAL	SCREW	ACTIVATION
BOARD	BLOCK	TERMIN-		METHOD
	LABELING	ALS

NOTE

Refer to LBI-38715 if the C3 Maestro console system is equipped with "Phase 1" Audio Matrix, Audio PA, I/O or Backplane Boards. All "Phase 1" boards have P29/500000xx00x part numbers and all "Phase 2" boards have P29/772xxxxxxx part numbers. When using any "Phase 1" board, external CD interface transformers and other special modifications are required for Call Director interfacing.

Install a 4-wire balanced line (two pairs) between the required CEC/IMC Audio Concentrator Card and Audio PA Board #2 in the Audio Tower. See the prior section entitled "CEC/IMC INTERCONNECTIONS" for

I/O

I/O

Audio PA #1

Audio PA #1

Audio PA #2

Audio PA #2

RELAY 1

RELAY 2

RELAY 1

RELAY 2

RELAY 1

RELAY 2

upper two

lower two

upper two

lower two

upper two

lower two

console PTT

not supported

<Alt><F9>

<Alt><F10>

not supported

not supported

additional details on the Audio Concentrator Card pin-outs. Terminate the Audio PA Board’s LINE D with an RJ-11 modular plug. RJ-11 pin-outs are shown in Table 5. Shielded cable is recommended.

Table 10 describes the audio signals between the Audio Tower’s Audio PA Board #2 and the CIM within the CEC/IMC. The descriptions are relative to the Audio Tower. All audio signals on these 600-ohm pairs have typical levels of 0 dBm.

Call Director (if equipped)

As shown in Figure 1, all C3 Maestro-to-Call Director interconnections at the console are made at the Audio Tower's I/O Board. Call Director telephone patch also requires a second Audio PA Board (#2) in the Audio Tower and a 4-wire balanced line between this board and the console’s CIM within the CEC/IMC. At the CEC/IMC, CIM audio channel/line four (4) is used for Call Director interfacing. CD control data interfacing is handled over the existing RS-232/RS-422 serial control data interface between the PC and the CEC/IMC. Refer to Figures 1, 7, 8 and 12 for Call Director interconnection details.

Console-to-CEC/IMC Audio Interconnections

All audio in to and out of a C3 Maestro dispatch console system enters and leaves the console via modular jacks on the Audio PA Boards. Both Audio PA Boards have the same "LINE A" and "LINE B" labeling at the modular jacks. As shown in Table 6, "LINE A" and "LINE B" labels on the second Audio PA Board (#2) are considered LINE C and LINE D respectively. Figure 7 shows modular jack locations. LINE C, if used for a second unselect speaker, connects to CEC/IMC CIM channel/line 3. Call Director LINE D connects to CEC/IMC CIM channel/line 4.

Console-to-Call Director Interconnections

Table 11 describes the various signals between the Audio Tower’s I/O Board and the Call Director. The descriptions are relative to the Audio Tower. All I/O Board connections are made at the "CALL DIRECTOR" female DB-9 connector. Figure 12 shows the connector's pin-out.

EQUIPMENT ROOM GROUNDING

Proper grounding techniques should be observed in order to protect the equipment and service personnel from lightning and other sources of electrical surges. All consoles should be connected to properly grounded 3- terminal outlets. If used, lightning arrestors, UPS equipment, and all other console-associated equipment should also be properly grounded.

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