Ericsson LBI-39076B system manual Mastr III Power Supply/Audio, Mastr II or IIe Power Supply/Audio

INSTALLATION LBI-39076B

MASTR III Power Supply/Audio

If the GTI unit is to be connected to a MASTR III repeater channel, connect a 19B803830P1 cable from the male 1x6-pin Molex connector on the back of the GTI (marked "POWER/AUDIO") to P4 on the MASTR III repeater T/R Shelf backplane, and to P801 on the repeater power supply, as shown in Figure 30. Note that the power supply end of the cable comes with pins attached to wires, but no connector shell. These pins are to be inserted into the existing connector shell already connected to P801 on the power supply. Insert the pin on the red wire into pin position 3 and the pin on the black wire into pin position 6.

GTI				T/R Shelf Backplane
POWER/AUDIO				P4
Tx Audio	1	#24 BRN	1	MIC_HI
Rx Audio	2	#24 BLU	6	INTRCM_AUDIO
PTT	4	#24 YEL	5	LOCAL_PTT
Gnd	5	#24 BLK	2	AGND
+12 Vdc	6		Existing Connector
				Power Supply
				P801
19B803830P1 Cable		#22 BLK	6	Neg
		#22 RED	3	Pos

Figure 30 - MASTR III Connections

MASTR II or IIe Power Supply/Audio

If the GTI unit is to be connected to a MASTR II or IIe repeater channel, the existing 19C320811G15 or G16 harness for the MASTR II or IIe repeater channel must be

modified. The modification involves two existing connectors on the harness: P40 - a 1x6-pin Molex connector, and P41 - a 1x2-pin Molex connector. These connectors will be found secured to the harness as it goes to J1201, J1202, J1203, and J1204 on the backplane of the repeater. Use the following procedure to rearrange the wires from these two connectors into the single connector, P40, and then connect it to the GTI unit:

1.Remove pin 1 from the shorter connector, P41, using a small screwdriver or scribe to depress the tongue of the pin in the open slot in the side of the connector while you pull gently on the wires going to the pin. Insert the pin into the longer connector, P40, as pin 6.

2.Remove pin 2 from the shorter connector, P41, and insert the pin back into the longer connector, P40, as pin 5.

3.Remove pin 3 (attached to the two W/Y/BN colored wires) from the longer connector, P40, and insert the pin back into the same connector, but now as pin 4.

4.Cut the short loop of white wire between pins 1 and 2 in the longer connector, P40.

5.Remove pin 1 from the longer connector, P40, and insert the pin back into the same connector, but now as pin 3.

NOTE

Once the MASTR II or IIe repeater harness has been modified per steps 4 and 5, a GTI unit must be connected to the repeater harness at all times to complete the audio loop of the repeater. If the GTI unit ever needs to be removed, you must reconnect the jumper cut in step 4. Because of the pin change in step 5, the jumper will be needed between pins 2 and 3.

Plug this rearranged P40 into the male 1x6-pin Molex connector (marked "POWER/AUDIO") on the back of the GTI. See Figure 31.

	GTI				T/R Shelf Backplane
POWER/AUDIO		P40	P3		J1203
Rx Audio		2	W-BK	7	TRANS AUDIO HI
			W-BK-R
Tx Audio		3
			W-Y-BR
	PTT	4		11	TRANS AUDIO LO
	Gnd	5
+12 Vdc		6			Rec/Exc Door
Modified Part of			P8		J933
19C320811G15 or G16 Harness			W-Y-BR	6	TRANS AUDIO HI
				5	TRANS AUDIO LO
	6
	5				Power Supply
P40	4		P9		P801
	3
			#22 BLK
				5	Neg
	2		#22 RED
				3	Pos
	1

Figure 31 - MASTR II & IIe Connections

PCM/Data Bus

The PCM/Data bus is made up of a PCM/Data bus termination plug and one or more 12-pair shielded cables daisy-chained between each GTI, the Master GTI, and the optional IAM (if present). These cables have a stackable

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