Connect Interface Cable - Huawei Quidway Eudemon 200 Installation Manual

Installation Manual
Quidway Eudemon 200 Firewall
Table 7-9 Description and setting of the DIP switches of 1 4E1
DIP switch
1BIT
2BIT
3BIT
4BIT
5BIT
6BIT
7BIT
8BIT
Caution:
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.
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

Description
ON
ON
75-ohm/120-ohm
ON
selection switch
ON
ON
OFF: RxRing is
grounded via
RxRing grounding
capacitance.
mode selection switch
ON: RxRing is grounded
directly.
RxShield grounding
-
selection switch
RxShield grounding
-
mode selection switch
7-13
Configuration of
75-ohm impedance
OFF
OFF
OFF
OFF
OFF
-
ON: RxShield is grounded.
OFF: RxShield is not
grounded.
OFF: RxShield is grounded via
capacitance
ON: RxShield is grounded
directly.
Chapter 7 Interface Module
Configuration of 120-ohm
impedance