3Com 3C13886 - Router OC-3 ATM SML Flexible Interface Card Installation Manual page 30

3Com Router Module Guide
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Figure 2-14 Default setting of the DIP switches
8BIT description and settings of DIP switch are given in the following table:
Table 2-10 Description and settings of the internal DIP switch of SIC-ERRI/ROUTER 1-PORT
FRACTIONAL E1 SIC
DIP switch
1BIT
2BIT
3BIT
4BIT
5BIT
6BIT
7BIT
on
Description
Switch for
75-ohm/120-ohm
options
Switch for RxRing
grounding mode options
Switch for RxShield
grounding options
2-15
Chapter 2 Smart Interface Cards
75 -ohm
impedance
ON OFF
ON OFF
ON OFF
ON OFF
ON OFF
OFF: RxRing
grounding via
capacitor
-
ON: RxRing directly
grounding
ON: RxShield grounding
-
OFF: RxShield
ungrounding
120 -ohm impedance