BLACK BOX® 10Mb Economy BNC Media Converters Installation & User Guide
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3.5 Connecting Ethernet Media
It is recommended that both of the media (TP and BNC) be connected with
power off so that both ports are connected when power is applied to the logic in the
electronics. If power is on, connect the Twisted Pair media before the BNC media. If
BNC is connected before TP with power on, it can create a Jabber condition, in which
case the JAB LED will come on and no packets will be processed.
See Sections 4.4 for details of the LEDs on the media converter models.
3.5.1 Connecting Twisted Pair (RJ-45 ports)
The following procedure describes how to connect a 10BASE-T twisted pair
segment to the RJ-45 port on the Black Box Media Converters. The procedure is the
same for both unshielded and shielded twisted pair segments.