Ericsson LBI-39076B system manual External JP4 Lead Fuse F2 Reference DS1

INSTALLATION LBI-39076B

	J1
EXTERNAL		JP4
M-LEAD	1	FUSE F2	-48 V
REFERENCE		DS1
		620 OHMS
M-LEAD	2

	3	4.7 OHMS					JP15
							B	A		REC.
4-WIRE						T1
							B	A		AUDIO
SEND				JP3			JP14
				D
			A	C			10
	4	4.7 OHMS		B
2-WIRE						JP13
			.47		JP10	A	B
SEND/REC.
OR			RING			LOOP			AUDIO	BAL.
4-WIRE			DET.		JP11
						CURRENT		T2
REC.									HYBRID	CKT.
				JP2		DET.
	5	4.7 OHMS		B
			A	C						SEND
				D
					K3		B
						JP9				AUDIO
							A
						A
	6	4.7 OHMS			JP8	C
			JP6			B
			100 OHMS
			A					A
			M					E	B	JP7
		D	B					M
			C					F	C
E-LEAD	7							D		B
								JP1	E-LEAD
										JP12
									DET.
							K2			A

DS2	M-LEAD RELAY
	DE-ENERGIZED for IDLE (shown)
	ENERGIZED for BUSY

EXTERNAL		620 OHMS
		JP5
E-LEAD	8	FUSE F3 GND
REFERENCE
	RJ-45

Figure 23 - Telephone Interface Circuit (Rev A Main Board)

21