H3C Technologies H3C MSR 50 - Manual (Page 230)

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When connecting an FIC-E1/FIC-E1-F module to an external 75-ohm cable, you are
recommended to place BITs 1 through 8 to the ON position; when connecting the module to an
external 120-ohm cable, place BITs 1 through 8 to the OFF position. Only trained personnel are
allowed to change the settings of the DIP switches.
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By default, all the DIP switch BITs are in the ON position (factory default), which means the
impedance of E1 ports is 75-ohm.
Connecting the interface cable
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Before you connect a port, read its label carefully; a wrong connection can cause damages to the
interface module and even the device.
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If outdoor cabling is involved, consider to install a special lightning arrester at the input end of the
interface cable for better lightning protection.
Connecting the interface cable of the FIC-1E1/FIC-2E1/FIC-1E1-F/FIC-2E1-F
Step1 Identify type of the E1 cable, and set the DIP switch for the to-be-connected E1/FE1 port correctly.
Step2 Plug the DB-15 connector of the E1 cable into the E1/FE1 port on the module.
Step3 Connect the other end of the E1 cable to another device.
When using a 75-ohm unbalanced coaxial cable, do the following:
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If no cable extension is needed, directly connect the BNC connector of the cable to the device.
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If cable extension is needed, connect the BNC connector of the cable to a coaxial connector, and
then connect the other end of the coaxial connector to the device using a 75-ohm E1 trunk cable.
When connecting the router to another device using an E1 coaxial cable, make connection with the TX
end to the RX end and the RX end to the TX end.