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EtherHub 1500 System User’s Guide
2-18 Hardware Description
BNC Module (10BASE2)
The BNC module has a built-in transceiver with a BNC port for
connection using thin coaxial cable. The BNC port can link up
to 30 hubs on a thin coaxial cable segment. The thin coaxial
cable that links the BNC ports may be extended up to 185
meters and have computers or other Ethernet devices attached
to it. When connecting two hubs via BNC ports, there should
be at least 0.5 meters (about two feet) of coaxial cable between
the two BNC ports. If the hub is at the end of an Ethernet
cable, plug and lock the 50-ohm (Ω) terminators to the T-type
connector on the BNC port.
F
Terminate an open end of any T-type connector that is plugged into a
BNC port with a 50-ohm (Ω) terminator. In particular, when a hub using
the BNC port connection is at the end of an Ethernet segment, terminate
the open end of the T-type connector with a 50-ohm (Ω) terminator. Also,
if the BNC port is not used, plug a T-type connector to it and terminate
both ends with a 50-ohm (Ω) terminator.
Power Socket
The power socket accepts AC power from 100 to 240V (± 10%) at
50 to 60 Hz (± 3Hz). The hub is equipped with a universal full-
range power source.
Power Switch
The power switch is located at the right side of the rear panel.
It is used to power the unit ON/OFF.