H3C SR6604 Installation Manual page 54

b. The other end of the cable provides one pair or multiple pairs of 75-ohm BNC connectors.
Connect the TX connectors and the RX connectors on this end to the RX connectors and
the TX connectors on the remote device respectively.
Figure4-17 Connect an E1 75-ohm cable
E1 / E1-F
(75ohm)
•
If you want to extend the cable, connect each BNC connector of the E1 75-ohm cable to one
end of a coaxial connector, and connect the remote device to the other end of the coaxial
connector through an E1 75-ohm adapter cable.
Figure4-18 Connecting an E1 75-ohm cable
E1 / E1-F
(75ohm)
•
If the impedance of the E1 interface on the remote device is 120 ohms, you must use an
impedance converter to adapt the impedance.
Figure4-19 Connecting an impedance converter
E1 / E1-F
(75ohm)
E1 75-ohm cable
RX
TX
E1 75-ohm cable
RX
TX
Coaxial connector
E1 75-ohm cable
RX
TX
Impedance converter
46
TX
Device
(75ohm E1 Port)
RX
75-ohm adapter cable
Straight-through cable
TX
Device
(75ohm E1 Port)
RX
Device
(120ohm E1 Port)