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Interface Card and Interface Module Manual
H3C MSR 20/30/50 Series Routers
Chapter 2 Smart Interface Cards
2-10
2.3.3 DIP Switch
E1/CE1/PRI interface is compatible with both 75-ohm impedance and 120-ohm
impedance. The interface matches different types of impedance through an 8BIT DIP
switch. By default, all the 8 positions of the DIP switch are ON, as shown in the
following figure:
on
1
2
3
4
5
6
7
8
Figure 2-14
Default setting of the DIP switches
8BIT description and settings of DIP switch are given in the following table:
Table 2-6
Description and settings of the internal DIP switch of SIC-ERRI/SIC-1E1-F
DIP switch
Description
75-ohm
impedance
120-ohm
impedance
1BIT
ON
OFF
2BIT
ON
OFF
3BIT
ON
OFF
4BIT
ON
OFF
5BIT
Switch for
75-ohm/120-ohm
options
ON
OFF
6BIT
Switch for RxRing
grounding mode
options
OFF: RxRing
grounding via
capacitor
ON: RxRing
directly grounding
—
7BIT
Switch for
RxShield
grounding options
—
ON: RxShield
grounding
OFF: RxShield
ungrounding