Ericsson LBI-39076B End-to-End, Loop Start End-to-End, Ground Start, Wire E&M, Microwave

INSTALLATION LBI-39076B

End-to-End, Loop Start

End-to-End, Ground Start
JP1-D	JP1-M

Ring

Tip

1

2

3

4

5

JP3-B	JP8-A		JP15-A
				Rec
			JP14-A
	JP13-A			Audio
Ring	Loop	Trans-	Hybrid
Det.		former
	Current
JP2-B	Det.			Send
				Audio
	JP9-B
	K3	K2

	1				GND		JP15-A
		JP3-B
	2
								Rec
							JP14-A
	3		JP13-A					Audio
Ring	4	Ring	Loop	Trans-		Hybrid
				former
Tip	5	Det.	Current
			Det.					Send
		JP2-B
	6							Audio
	7		JP9-A	JP8-B			JP12-B
					Current Det.			-48V
	8		K3	K2

Figure 19 - End-to-End Loop Start (Rev A Main Board)

Figure 21 - End-to-End Ground Start (Rev A Main Board)

Figure 19 shows the GTI telephone interface configured per Table 2 for End-to-End, Loop Start. Two wires are needed to connect to the telephone company side. Battery for the loop current is provided by the telephone office.

Figure 21 shows the GTI telephone interface configured per Table 2 for End-to-End, Ground Start. Two wires are needed to connect to the telephone company side. Battery for the loop current is provided by the telephone office.

4-Wire E&M, Microwave
		JP4			-48 V
MB		1
			Res
		JP6-M	IDLE		JP1-A
MA		2		JP1-B
			BUSY
			K2	JP1-E
		JP3-C		JP1-M
4-W Send		3
		JP3-A		JP15-B
4-W Rec		4	Trans-
				JP14-B	Rec Audio
			former
		JP2-A
4-W Rec		5
			JP11
		JP2-C	JP10	Trans-	Send Audio.
				former
4-W Send		6
		JP6-C
EA	1000 Ohms	7	E-Lead Det.	JP12-B
			JP12-A
		JP5	Res
EB		8
					GND

Figure 20 - 4-Wire E&M Microwave (Rev A Main Board)

4-Wire E&M, Type I
		JP4	FUSE F2		-48 V
MB		1
			Res
		JP6-M	IDLE		JP1-A
MA		2		JP1-B
			BUSY
			K2	JP1-E
		JP3-C		JP1-M
4-W Send		3
		JP3-A		JP15-B
4-W Rec		4	Trans-
				JP14-B	Rec Audio
			former
		JP2-A
4-W Rec		5
			JP11
		JP2-C	JP10	Trans-	Send Audio.
				former
4-W Send		6
		JP6-C
EA	1000 Ohms	7	E-Lead Det.	JP12-B
			JP12-A
		JP5	Res
EB		8
			FUSE F3		GND
Figure 22 - 4-Wire E&M Type 1 (Rev A Main Board)

Figure 20 shows the GTI telephone interface configured per Table 2 for 4-Wire E&M, Microwave. Eight wires are needed to connect to the telephone company side, and 1000 ohms must be installed in series with the E-Lead. The interface interprets the absence of E-Lead current as an idle condition. The interface provides an opened-loop M-Lead for an idle condition and a closed-loop for a busy condition.

Figure 22 shows the GTI telephone interface configured per Table 2 for 4-Wire E&M, Type I. Six wires are needed to connect to the telephone company side, and 1000 ohms must be installed in series with the E-Lead. The interface interprets the absence of E-Lead current as an idle condition. The interface provides an open M-Lead for an idle condition and applies -48 V for a busy condition.

19