Installation Manual
Quidway Eudemon 200 Firewall Chapter 7 Interface Module
7-13
Table 7-9 Description and setting of the DIP switches of 1 4E1
DIP switch Description
Configuration of
75-ohm impedance
Configuration of 120-ohm
impedance
1BIT ON OFF
2BIT ON OFF
3BIT ON OFF
4BIT ON OFF
5BIT
75-ohm/120-ohm
selection switch
ON OFF
6BIT
RxRing grounding
mode selection switch
OFF: RxRing is
grounded via
capacitance.
ON: RxRing is grounded
directly.
-
7BIT
RxShield grounding
selection switch
-
ON: RxShield is grounded.
OFF: RxShield is not
grounded.
8BIT
RxShield grounding
mode selection switch
-
OFF: RxShield is grounded via
capacitance
ON: RxShield is grounded
directly.
Caution:
z So far as the 4E1 are concerned, you are recommended to place the DIP switches BITs 1 through 8 to
the ON position when connecting the modules to external 75-ohm cables, and BITs 1 through 8 to the
OFF position when connecting the modules to external 120-ohm cables. The untrained personnel are
disallowed to change the positions of the DIP switches.
z By default, all the DIP switches for 4E1 are placed to the ON position, that is, the impedance of E1
ports is 75-ohm.
For the pinouts of these cables, please refer to Appendix A.
7.6.6 Connect Interface Cable
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