3Com 3C13886 Installation Guide - Page 82
ON: RxRing is, ON: RxShield is
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3Com Router Module Guide 3BIT 4BIT 5BIT 6BIT 7BIT 8BIT Chapter 3 Multifunctional Interface Modules ON ON ON RxRing grounding mode selection switch OFF: RxRing is grounded via capacitance. ON: RxRing is grounded directly. RxShield grounding - mode selection switch SxShield grounding - mode selection switch OFF OFF OFF - ON: RxShield is grounded. OFF: RxShield is not grounded. OFF: RxShield is grounded via capacitance ON: RxShield is grounded directly. Caution: It is recommended to select the DIP switch of Router 2 and 4-Port CE1/PRI MIM and modules in this way: when connecting 75-ohm cable, flip BIT1-8 to ON, and when connecting 120-ohm cable, flip BIT1-8 to OFF. Positions of DIP switches can only be changed by the trained personnel. By default, all of the DIP switches of Router 2 and 4-Port CE1/PRI MIM and modules are factory-configured to ON, that is, the impedance of E1 interface is 75-ohm. 3.8.6 Connecting the Interface Cable 3-38