Black Box for details.

BLACK BOX® 10Mb Economy BNC Media Converters Installation & User Guide
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3.5.2 Connecting ThinNet (10BASE2)
Note: connect TP media before connecting BNC media if power is on in the
Media Converter unit. See Section 3.5 Connecting Media above.
Connect the ThinNet coax cable to the BNC connector on the Media Converter
in the same manner as is done for any standard BNC connection. Be sure that the BNC
segment is properly terminated using a standard “T” connector.
The LE1502A-R3 regular and LE1508A hardened BNC media converters are
also equipped with “Terminator Switch” (∝-50Ω), which can be used to eliminate the
standard “T” connector by moving the “Terminator Switch” to the 50Ω position. See
Section 4.5 BNC port, Internal Termination Switch
for details.