3Com MSR 50, MSR 30, MSR 20 manual Dip

86CHAPTER 3: MULTIFUNCTIONAL INTERFACE MODULES

Figure 96 Default setting of DIP switches for MIM-1E1/MIM-2E1/MIM-4E1 and

MIM-1E1-F/MIM-2E1-F/MIM-4E1-F modules

on

1

2

3

4

5

6

7

8

Description of DIP switch settings is given in the following table for

MIM-1E1/MIM-2E1/MIM-4E1 and MIM-1E1-F/MIM-2E1-F/MIM-4E1-F modules:

Table 49 Description of DIP switch settings of MIM-1E1/MIM-2E1/MIM-4E1 and

MIM-1E1-F/MIM-2E1-F/MIM-4E1-F modules

		Configuration of	Configuration of
DIP	Description	75-ohm impedance	120-ohm impedance
1BIT	75-ohm/120-ohm	ON	OFF
	selection switch
2BIT		ON	OFF
3BIT		ON	OFF
4BIT		ON	OFF
5BIT		ON	OFF
6BIT	RxRing grounding	OFF: RxRing is	-
	mode selection	grounded via
	switch	capacitance.
		ON: RxRing is
		grounded directly.
7BIT	RxShield grounding	-	ON: RxShield is
	mode selection		grounded.
	switch		OFF: RxShield is not
			grounded.
8BIT	SxShield grounding	-	OFF: RxShield is
	mode selection		grounded via
	switch		capacitance
			ON: RxShield is
			grounded directly.

c CAUTION:

■It is recommended to select the DIP switch of MIM-1E1/MIM-2E1/MIM-4E1 and MIM-1E1-F/MIM-2E1-F/MIM-4E1-F modules in this way: when connecting

75-ohm cable, flip BIT1-8 to ON, and when connecting 120-ohm cable, flip BIT1-8 to OFF. Positions of DIP switches can only be changed by the trained personnel.