3Com MSR 20, MSR 30 Description of DIP switch settings of SIC-ERRI/SIC-1E1-F, Configuration, Dip

46CHAPTER 2: SMART INTERFACE CARDS

Figure 39 Default setting of DIP switches

on

1

2

3

4

5

6

7

8

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

Table 21 Description of DIP switch settings of SIC-ERRI/SIC-1E1-F

		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 in this way: when connecting

75-ohm cable, flip BIT1-8 to ON, and when connecting 120-ohm cable, flip BIT1-8 to OFF.

■By default, all of the DIP switches are factory-configured to ON, that is, the impedance of E1 interface is 75-ohm.

Interface LEDs The following figure illustrates the SIC-1VE1 panel.