3Com MSR 20, MSR 30, MSR 50 manual Pbx, Router side Signal at switch side Bell RJ-45 Pin Wire

196CHAPTER 4: FLEXIBLE INTERFACE CARDS

When connecting a switch to your router, a Bell V four-wire connection is preferred.

The following figure shows the pinouts of RJ-45 receptacle on E&M cards. The pins are numbered 1 to 8 from left to right:

Figure 241 Pinouts of RJ-45 receptacle

When connection is made in Bell V 4-wire mode, the pinouts of RJ-45 receptacles at router side and at the switch side are shown in the following figure:

Figure 242 E&M interface cable (Bell V 4-wire)

PBX

E

detect

-48 V

off-hookM

on-hook

T0T0

4- wire

R0R0

voice signal

T1T1

R1R1

	Router
	on-hook
M 7	off-hook
on-hook
2		-48 V
		-48 V
E
	detect

6

3 4- wire voice signal

5

4

Table 141 Pinouts of E&M interface cable (Bell V 4-wire)

Router side

		Signal at switch side (Bell V
RJ-45 Pin	Signal	4-wire)
1	SB (negative power supply)	-
2	E	M
3	RING0	RING0
4	RING1	RING1
5	TIP1	TIP1
6	TIP0	TIP0

7 M E